Freshwater and its role in the Arctic Marine System: Sources, disposition, storage, export, and physical and biogeochemical consequences in the Arctic and global oceans

The Arctic Ocean is a fundamental node in the global hydrological cycle and the ocean's thermohaline circulation. We here assess the system's key functions and processes: (1) the delivery of fresh and low-salinity waters to the Arctic Ocean by river inflow, net precipitation, distillation during the freeze/thaw cycle, and Pacific Ocean inflows; (2) the disposition (e.g., sources, pathways, and storage) of freshwater components within the Arctic Ocean; and (3) the release and export of freshwater components into the bordering convective domains of the North Atlantic. We then examine physical, chemical, or biological processes which are influenced or constrained by the local quantities and geochemical qualities of freshwater; these include stratification and vertical mixing, ocean heat flux, nutrient supply, primary production, ocean acidification, and biogeochemical cycling. Internal to the Arctic the joint effects of sea ice decline and hydrological cycle intensification have strengthened coupling between the ocean and the atmosphere (e.g., wind and ice drift stresses, solar radiation, and heat and moisture exchange), the bordering drainage basins (e.g., river discharge, sediment transport, and erosion), and terrestrial ecosystems (e.g., Arctic greening, dissolved and particulate carbon loading, and altered phenology of biotic components). External to the Arctic freshwater export acts as both a constraint to and a necessary ingredient for deep convection in the bordering subarctic gyres and thus affects the global thermohaline circulation. Geochemical fingerprints attained within the Arctic Ocean are likewise exported into the neighboring subarctic systems and beyond. Finally, we discuss observed and modeled functions and changes in this system on seasonal, annual, and decadal time scales and discuss mechanisms that link the marine system to atmospheric, terrestrial, and cryospheric systems.

[1]  K. Arrigo,et al.  Ecosystem characteristics and processes facilitating persistent macrobenthic biomass hotspots and associated benthivory in the Pacific Arctic , 2015 .

[2]  M. Holland,et al.  Twenty-First-Century Arctic Climate Change in CCSM4 , 2012 .

[3]  H. Melling,et al.  Modification of halocline source waters during freezing on the Beaufort Sea shelf: evidence from oxygen isotopes and dissolved nutrients , 1995 .

[4]  E. Carmack,et al.  Beaufort Gyre freshwater reservoir: State and variability from observations , 2009 .

[5]  Thomas J. Weingartner,et al.  Interannual changes in the Bering Strait fluxes of volume, heat and freshwater between 1991 and 2004 , 2006 .

[6]  Peter H. Gleick,et al.  The World’s Water , 2011 .

[7]  F. Saucier,et al.  The Arctic–Subarctic Exchange Through Hudson Strait , 2008 .

[8]  R. Dickson,et al.  Climatic reversal in northern North Atlantic , 1975, Nature.

[9]  K. Arrigo,et al.  Secular trends in Arctic Ocean net primary production , 2011 .

[10]  E. Carmack,et al.  Deepening of the nutricline and chlorophyll maximum in the Canada Basin interior, 2003–2009 , 2010 .

[11]  H. Melling,et al.  Geometrical constraints on the evolution of ridged sea ice , 2004 .

[12]  J. Overland,et al.  The Arctic shifts to a new normal , 2013 .

[13]  P. Raymond,et al.  Seasonal and Annual Fluxes of Nutrients and Organic Matter from Large Rivers to the Arctic Ocean and Surrounding Seas , 2012, Estuaries and Coasts.

[14]  J. Wallace,et al.  Variations in the age of Arctic sea‐ice and summer sea‐ice extent , 2004 .

[15]  Fanny Girard-Ardhuin,et al.  Evolution of the Arctic Ocean Salinity, 2007–08: Contrast between the Canadian and the Eurasian Basins , 2011 .

[16]  E. Carmack,et al.  Surface freshening of the Canada Basin, 2003–2007: River runoff versus sea ice meltwater , 2009 .

[17]  R. Macdonald,et al.  Physical and geochemical properties across the Atlantic/Pacific water mass front in the southern Canadian Basin , 1996 .

[18]  J. Kay,et al.  The Arctic’s rapidly shrinking sea ice cover: a research synthesis , 2012, Climatic Change.

[19]  Jinlun Zhang,et al.  Seasonality and long‐term trend of Arctic Ocean surface stress in a model , 2014 .

[20]  L. Thompson,et al.  Reconstructed changes in Arctic sea ice over the past 1,450 years , 2011, Nature.

[21]  R. Feely,et al.  Storm‐induced upwelling of high pCO2 waters onto the continental shelf of the western Arctic Ocean and implications for carbonate mineral saturation states , 2012 .

[22]  J. Toole,et al.  The Ice-Tethered Profiler : Argo of the Arctic , 2011 .

[23]  Wei-Jun Cai,et al.  Decrease in the CO2 Uptake Capacity in an Ice-Free Arctic Ocean Basin , 2010, Science.

[24]  J. Inoue,et al.  The Role of Barents Sea Ice in the Wintertime Cyclone Track and Emergence of a Warm-Arctic Cold-Siberian Anomaly , 2012 .

[25]  A. da Silva,et al.  New stratospheric dust belt due to the Chelyabinsk bolide , 2013 .

[26]  S. Wijffels,et al.  Fifty-Year Trends in Global Ocean Salinities and Their Relationship to Broad-Scale Warming , 2010 .

[27]  Kenneth H. Dunton,et al.  The nearshore western Beaufort Sea ecosystem: Circulation and importance of terrestrial carbon in arctic coastal food webs , 2006 .

[28]  C. Guay,et al.  Barium as a tracer of Arctic halocline and river waters , 1997 .

[29]  J. Morison,et al.  Circulation of summer Pacific halocline water in the Arctic Ocean , 2004 .

[30]  E. Carmack,et al.  Wind‐forced upwelling and internal Kelvin wave generation in Mackenzie Canyon, Beaufort Sea , 1998 .

[31]  C. Deser,et al.  Atmospheric impacts of Arctic sea-ice loss, 1979–2009: separating forced change from atmospheric internal variability , 2013, Climate Dynamics.

[32]  K. Arrigo,et al.  Primary production in the Arctic Ocean, 1998–2006 , 2008 .

[33]  R. Macdonald,et al.  Changes in temperature and tracer distributions within the Arctic Ocean: results from the 1994 Arctic Ocean section , 1997 .

[34]  E. Carmack,et al.  One more step toward a warmer Arctic , 2005 .

[35]  E. Carmack,et al.  Freshwater Storage in the Northern Ocean and the Special Role of the Beaufort Gyre , 2008 .

[36]  D. Dummy,et al.  Correction to “Decrease of river runoff in the upper waters of the Eurasian Basin, Arctic Ocean, between 1991 and 1996: Evidence from δ18O data” by Peter Schlosser, Robert Newton, Brenda Ekwurzel, Samar Khatiwala, Rick Mortlock, and Rick Fairbanks , 2002 .

[37]  D. Barber,et al.  What is the fate of the river waters of Hudson Bay , 2011 .

[38]  Robert P. Garrett,et al.  Sea ice thickness distribution in the Arctic Ocean , 1987 .

[39]  Myoung-Jong Noh,et al.  An improved mass budget for the Greenland ice sheet , 2013 .

[40]  J. Marotzke,et al.  Observations reveal external driver for Arctic sea‐ice retreat , 2012 .

[41]  I. Peeken,et al.  Insight into protist diversity in Arctic sea ice and melt-pond aggregate obtained by pyrosequencing , 2014 .

[42]  Craig M. Lee,et al.  Volume, Freshwater, and Heat Fluxes through Davis Strait, 2004–05* , 2011 .

[43]  M. R. van den Broeke,et al.  A Reconciled Estimate of Glacier Contributions to Sea Level Rise: 2003 to 2009 , 2013, Science.

[44]  D. Barber,et al.  Atlantic water flow into the Arctic Ocean through the St. Anna Trough in the northern Kara Sea , 2015 .

[45]  D. Feltham,et al.  Impact of Variable Atmospheric and Oceanic Form Drag on Simulations of Arctic Sea Ice , 2014 .

[46]  V. Gordeev.  Fluvial sediment flux to the Arctic Ocean , 2006 .

[47]  Sofia Hjalmarsson,et al.  Arctic Ocean Shelf - basin interaction, an active continental shelf CO2 pump and its impact on degree of calcium carbonate solubility , 2010 .

[48]  Thomas J. Weingartner,et al.  The Siberian Coastal Current: A wind‐ and buoyancy‐forced Arctic coastal current , 1999 .

[49]  Karen E. Frey,et al.  Impacts of permafrost degradation on arctic river biogeochemistry , 2009 .

[50]  E. Carmack,et al.  A tale of two basins: An integrated physical and biological perspective of the deep Arctic Ocean , 2015 .

[51]  C. Lovejoy,et al.  Importance of particle-associated bacterial heterotrophy in a coastal Arctic ecosystem , 2009 .

[52]  I. Polyakov,et al.  Warming of the Intermediate Atlantic Water of the Arctic Ocean in the 2000s , 2012 .

[53]  Michael Steele,et al.  PHC: A Global Ocean Hydrography with a High-Quality Arctic Ocean , 2001 .

[54]  I. Dmitrenko,et al.  The long-term and interannual variability of summer fresh water storage over the eastern Siberian shelf: Implication for climatic change , 2008 .

[55]  H. Melling,et al.  Trends in the draft and extent of seasonal pack ice, Canadian Beaufort Sea , 2005 .

[56]  Ian Simmonds,et al.  The Atmospheric Response to Three Decades of Observed Arctic Sea Ice Loss , 2013 .

[57]  M. Steele,et al.  Ice-Seawater Turbulent Boundary Layer Interaction with Melting or Freezing , 1986 .

[58]  F. Joos,et al.  Imminent ocean acidification in the Arctic projected with the NCAR global coupled carbon cycle-climate model , 2009 .

[59]  H. L. Miller,et al.  Climate Change 2007: The Physical Science Basis , 2007 .

[60]  I. Dmitrenko,et al.  Arctic Ocean Freshwater Changes over the Past 100 Years and Their Causes , 2008 .

[61]  Kyle Hilburn,et al.  Satellite-based global-ocean mass balance estimates of interannual variability and emerging trends in continental freshwater discharge , 2010, Proceedings of the National Academy of Sciences.

[62]  Anders Stigebrandt,et al.  A Model for the Thickness and Salinity of the Upper Layer in the Arctic Ocean and the Relationship between the Ice Thickness and Some External Parameters , 1981 .

[63]  D. Cavalieri,et al.  Antarctic sea ice variability and trends, 1979-2010 , 2012 .

[64]  G. Johnson,et al.  Some controls on flow and salinity in Bering Strait , 2006 .

[65]  W. R. Peltier,et al.  Secular sea level change in the Russian sector of the Arctic Ocean , 2004 .

[66]  Ron Kwok,et al.  Changing Arctic Ocean freshwater pathways , 2012, Nature.

[67]  Ron Kwok,et al.  Decline in Arctic sea ice thickness from submarine and ICESat records: 1958–2008 , 2009 .

[68]  Ron Kwok,et al.  Toward Quantifying the Increasing Role of Oceanic Heat in Sea Ice Loss in the New Arctic , 2015 .

[69]  Fridtjof Nansen,et al.  The polar oceans and their role in shaping the global environment : the Nansen centennial volume , 1994 .

[70]  Humfrey Melling,et al.  Development of seasonal pack ice in the Beaufort Sea during the winter of 1991–1992: A view from below , 1996 .

[71]  M. Holland,et al.  Modeling the Arctic freshwater system and its integration in the global system: Lessons learned and future challenges , 2016 .

[72]  C. Guay,et al.  Differentiating fluvial components of upper Canada Basin waters on the basis of measurements of dissolved barium combined with other physical and chemical tracers , 2009 .

[73]  Dennis A. Hansell,et al.  Rapid removal of terrigenous dissolved organic carbon over the Eurasian shelves of the Arctic Ocean , 2011 .

[74]  S. Déry,et al.  Interannual variability and interdecadal trends in Hudson Bay streamflow , 2011 .

[75]  M. Starr,et al.  Low calcium carbonate saturation state in an Arctic inland sea having large and varying fluvial inputs: The Hudson Bay system , 2014 .

[76]  I. Polyakov,et al.  Long-Term Ice Variability in Arctic Marginal Seas , 2003 .

[77]  R. Macdonald,et al.  Connections among ice, runoff and atmospheric forcing in the Beaufort Gyre , 1999 .

[78]  J. Wallace,et al.  The Arctic oscillation signature in the wintertime geopotential height and temperature fields , 1998 .

[79]  M. Chierici,et al.  Calcium carbonate saturation in the surface water of the Arctic Ocean: undersaturation in freshwater influenced shelves , 2009 .

[80]  Thomas M. Marchitto,et al.  Enhanced Modern Heat Transfer to the Arctic by Warm Atlantic Water , 2011, Science.

[81]  E. Carmack,et al.  The Arctic Ocean and Climate: A Perspective , 2013 .

[82]  M. Holland,et al.  Trends in Arctic sea ice extent from CMIP5, CMIP3 and observations , 2012 .

[83]  L. Anderson,et al.  On the origin of the chemical properties of the Arctic Ocean halocline , 1986 .

[84]  A. Townsend‐Small,et al.  River export of nutrients and organic matter from the North Slope of Alaska to the Beaufort Sea , 2014 .

[85]  E. Carmack,et al.  On the halocline of the Arctic Ocean , 1981 .

[86]  J. Toole,et al.  Characterizing the eddy field in the Arctic Ocean halocline , 2014 .

[87]  J. Tremblay,et al.  The effects of irradiance and nutrient supply on the productivity of Arctic waters: a perspective on climate change , 2009 .

[88]  S. Bacon,et al.  Arctic mass, freshwater and heat fluxes: methods and modelled seasonal variability , 2015, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[89]  Pierre Rampal,et al.  Positive trend in the mean speed and deformation rate of Arctic sea ice, 1979–2007 , 2009 .

[90]  M. Karcher,et al.  Current estimates of freshwater flux through Arctic and subarctic seas , 2007 .

[91]  Ross D. Brown,et al.  Interannual Variability of Landfast Ice Thickness in the Canadian High Arctic, 1950-89 , 1992 .

[92]  T. Prowse,et al.  Arctic River Flow: A Review of Contributing Areas , 2000 .

[93]  E. Carmack.  The Arctic Ocean’s Freshwater Budget: Sources, Storage and Export , 2000 .

[94]  J. Wallace,et al.  Global warming and winter weather. , 2014, Science.

[95]  M. Mcphee.  Air-Ice-Ocean Interaction , 2008 .

[96]  M. Holland,et al.  Implications of Arctic sea ice changes for North Atlantic deep convection and the meridional overturning circulation in CCSM4‐CMIP5 simulations , 2013 .

[97]  L. Anderson,et al.  Global and regional drivers of nutrient supply, primary production and CO2 drawdown in the changing Arctic Ocean , 2015 .

[98]  E. Carmack,et al.  Identification, characterization, and change of the near-surface temperature maximum in the Canada Basin, 1993-2008 , 2010 .

[99]  L. Anderson,et al.  On the Intermediate Depth Waters of the Arctic Ocean , 2013 .

[100]  Muyin Wang,et al.  Warm Arctic—cold continents: climate impacts of the newly open Arctic Sea , 2011 .

[101]  Dara Entekhabi,et al.  Recent Arctic amplification and extreme mid-latitude weather , 2014 .

[102]  Craig M. Lee,et al.  Impact of Wind-Driven Mixing in the Arctic Ocean , 2011 .

[103]  J. Toole,et al.  Mechanisms of Pacific Summer Water variability in the Arctic's Central Canada Basin , 2014 .

[104]  Marvin L. Johnson,et al.  Two circulation regimes of the wind-driven Arctic Ocean , 1997 .

[105]  John M. Toole,et al.  Horizontal Density Structure and Restratification of the Arctic Ocean Surface Layer , 2012 .

[106]  O. Pokrovsky,et al.  Transformation of organic carbon, trace element, and organo-mineral colloids in the mixing zone of the largest European Arctic river , 2013 .

[107]  N. Bond,et al.  Is there a “new normal” climate in the Beaufort Sea? , 2013 .

[108]  L. Hinzman,et al.  Trajectory of the Arctic as an integrated system. , 2013, Ecological applications : a publication of the Ecological Society of America.

[109]  Alfonso Mucci,et al.  Impact of biogeochemical processes and environmental factors on the calcium carbonate saturation state in the Circumpolar Flaw Lead in the Amundsen Gulf, Arctic Ocean , 2011 .

[110]  E. Carmack,et al.  Holes in Progressively Thinning Arctic Sea Ice Lead to New Ice Algae Habitat , 2011 .

[111]  E. Carmack,et al.  The Rapid Response of the Canada Basin to Climate Forcing: From Bellwether to Alarm Bells , 2011 .

[112]  J. Ellis,et al.  Muddy waters: elevating sediment input to coastal and estuarine habitats , 2004 .

[113]  J. Toole,et al.  Automated Ice-Tethered Profilers for Seawater Observations under Pack Ice in All Seasons , 2008 .

[114]  Timo Vihma,et al.  Effects of Arctic Sea Ice Decline on Weather and Climate: A Review , 2014, Surveys in Geophysics.

[115]  M. Charette,et al.  Greenland meltwater as a significant and potentially bioavailable source of iron to the ocean , 2013 .

[116]  Julienne C. Stroeve,et al.  The sea ice mass budget of the Arctic and its future change as simulated by coupled climate models , 2010 .

[117]  Thomas J. Weingartner,et al.  Observed increases in Bering Strait oceanic fluxes from the Pacific to the Arctic from 2001 to 2011 and their impacts on the Arctic Ocean water column , 2012 .

[118]  M. R. van den Broeke,et al.  Partitioning Recent Greenland Mass Loss , 2009, Science.

[119]  C. Nicklin.  Capturing Surface Processes , 2014, Science.

[120]  Samar Khatiwala,et al.  Decrease of river runoff in the upper waters of the Eurasian Basin, Arctic Ocean, between 1991 and 1996: Evidence from δ18O data , 2002 .

[121]  E. Carmack,et al.  Thermohaline circulation in the Arctic Mediterranean Seas , 1985 .

[122]  J. Bamber,et al.  Arctic circulation regimes , 2015, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[123]  J. Johannessen,et al.  Satellite-derived multi-year trend in primary production in the Arctic Ocean , 2013 .

[124]  Bob Dickson,et al.  Arctic–Subarctic Ocean Fluxes: Defining the Role of the Northern Seas in Climate , 2008 .

[125]  T. R. Anderson,et al.  Regional variability of acidification in the Arctic: a sea of contrasts , 2013 .

[126]  Seong-Joong Kim,et al.  The Melting Arctic and Midlatitude Weather Patterns: Are They Connected?* , 2015 .

[127]  C. Lique,et al.  Competing Effects of Elevated Vertical Mixing and Increased Freshwater Input on the Stratification and Sea Ice Cover in a Changing Arctic Ocean , 2016 .

[128]  F. M. Selten,et al.  Future increases in Arctic precipitation linked to local evaporation and sea-ice retreat , 2014, Nature.

[129]  D. Chapman,et al.  Trapping of a Coastal Density Front by the Bottom Boundary Layer , 1994 .

[130]  M. Steele,et al.  Synthesis of primary production in the Arctic Ocean: III. Nitrate and phosphate based estimates of net community production , 2013 .

[131]  Richard B. Lammers,et al.  Increasing River Discharge to the Arctic Ocean , 2002, Science.

[132]  Y. Kawaguchi,et al.  Enhancement/reduction of biological pump depends on ocean circulation in the sea-ice reduction regions of the Arctic Ocean , 2011 .

[133]  Kathleen F. Jones,et al.  Arctic sea-ice melt in 2008 and the role of solar heating , 2011, Annals of Glaciology.

[134]  R. Galley,et al.  Perennial pack ice in the southern Beaufort Sea was not as it appeared in the summer of 2009 , 2009 .

[135]  Hans-Werner Jacobi,et al.  Arctic Climate Change: The ACSYS Decade and Beyond , 2012 .

[136]  C. Mauritzen.  Oceanography: Arctic freshwater , 2012 .

[137]  Craig M. Lee,et al.  The Arctic Ocean in summer: A quasi‐synoptic inverse estimate of boundary fluxes and water mass transformation , 2012 .

[138]  R. Kwok,et al.  The thinning of Arctic sea ice , 2011 .

[139]  Terry D. Prowse,et al.  Arctic Freshwater Synthesis: Introduction , 2015 .

[140]  Ursula Schauer,et al.  The Arctic Ocean Boundary Current along the Eurasian slope and the adjacent Lomonosov Ridge: Water mass properties, transports and transformations from moored instruments , 2001 .

[141]  Spatial variability of epibenthic communities on the Alaska Beaufort Shelf , 2015, Polar Biology.

[142]  P. Stabeno,et al.  Coupled wind-forced controls of the Bering–Chukchi shelf circulation and the Bering Strait throughflow: Ekman transport, continental shelf waves, and variations of the Pacific–Arctic sea surface height gradient , 2014 .

[143]  Kevin E. Trenberth,et al.  Estimates of Freshwater Discharge from Continents: Latitudinal and Seasonal Variations , 2002 .

[144]  B. Konar.  Lack of recovery from disturbance in high-arctic boulder communities , 2013, Polar Biology.

[145]  Rüdiger Gerdes,et al.  Enhanced poleward moisture transport and amplified northern high-latitude wetting trend , 2012 .

[146]  S. Fujita,et al.  Iron and humic‐type fluorescent dissolved organic matter in the Chukchi Sea and Canada Basin of the western Arctic Ocean , 2011 .

[147]  E. Carmack,et al.  The contiguous domains of Arctic Ocean advection: Trails of life and death , 2015 .

[148]  Craig M. Lee,et al.  Calcium carbonate saturation states in the waters of the Canadian Arctic Archipelago and the Labrador Sea , 2010 .

[149]  E. Carmack,et al.  Nitrogen balance and Arctic throughflow , 2006, Nature.

[150]  M. Timmermans.  Air-Ice-Ocean Interaction: Turbulent Ocean Boundary Layer Exchange Processes , 2008 .

[151]  U. Send,et al.  Origin and Composition of Seasonal Labrador Sea Freshwater , 2007 .

[152]  R. Gradinger,et al.  Arctic sea-ice ridges—Safe heavens for sea-ice fauna during periods of extreme ice melt? , 2010 .

[153]  L. Cooper,et al.  Food Web Structure of the Alaskan Nearshore Shelf and Estuarine Lagoons of the Beaufort Sea , 2012, Estuaries and Coasts.

[154]  J. Francis,et al.  Evidence linking rapid Arctic warming to mid-latitude weather patterns , 2015, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[155]  L. Anderson,et al.  Variability in river runoff distribution in the Eurasian Basin of the Arctic Ocean , 2004 .

[156]  S. Rahmstorf,et al.  Exceptional twentieth-century slowdown in Atlantic Ocean overturning circulation , 2015 .

[157]  A. Weaver,et al.  Relative sensitivity of the Atlantic meridional overturning circulation to river discharge into Hudson Bay and the Arctic Ocean , 2007 .

[158]  Fiona,et al.  Arctic Ocean change and consequences to biodiversity: A perspective on linkage and scale (scientific note) , 2001 .

[159]  I. Dmitrenko,et al.  Properties of the Atlantic derived halocline waters over the Laptev Sea continental margin: Evidence from 2002 to 2009 , 2011 .

[160]  Lee W. Cooper,et al.  Flow‐weighted values of runoff tracers (δ18O, DOC, Ba, alkalinity) from the six largest Arctic rivers , 2008 .

[161]  J. Morison,et al.  Halocline water formation in the Barents Sea , 1995 .

[162]  M. Stieglitz,et al.  Lability of DOC transported by Alaskan rivers to the Arctic Ocean , 2008 .

[163]  M. Holland,et al.  The emergence of surface-based Arctic amplification , 2008 .

[164]  L. Shaffrey,et al.  Equator-to-pole temperature differences and the extra-tropical storm track responses of the CMIP5 climate models , 2014, Climate Dynamics.

[165]  Dag Slagstad,et al.  Physical constrains and productivity in the future Arctic Ocean , 2015, Front. Mar. Sci..

[166]  L. Rainville,et al.  Recent Arctic Ocean sea ice loss triggers novel fall phytoplankton blooms , 2014 .

[167]  H. Melling,et al.  Observations in the Ocean , 2012 .

[168]  J. Syvitski.  The freshwater budget of the Arctic Ocean , 2001 .

[169]  Laurence C. Smith,et al.  Climatic and anthropogenic factors affecting river discharge to the global ocean, 1951–2000 , 2008 .

[170]  M. Lipizer,et al.  Tracing Pacific water in the North Atlantic Ocean , 2003 .

[171]  E. Carmack,et al.  Joint effects of boundary currents and thermohaline intrusions on the warming of Atlantic water in the Canada Basin, 1993–2007 , 2009 .

[172]  R. Dickson,et al.  The great salinity anomaly in the northern North Atlantic 1968-1982 , 1988 .

[173]  Stanford B. Hooker,et al.  Pan-Arctic distributions of continental runoff in the Arctic Ocean , 2013, Scientific Reports.

[174]  F. Saucier,et al.  The outflow from Hudson Strait and its contribution to the Labrador Current , 2008 .

[175]  T. Haine,et al.  Wind‐driven Arctic freshwater anomalies , 2013 .

[176]  E. Fahrbach,et al.  Variation of Measured Heat Flow Through the Fram Strait Between 1997 and 2006 , 2008 .

[177]  S. Doney,et al.  Changes in the North Atlantic Oscillation influence CO2 uptake in the North Atlantic over the past 2 decades , 2008 .

[178]  Submarine groundwater discharge (SGWD): an unseen yet potentially important coastal phenomenon in Canada , 2012, Natural Hazards.

[179]  M. Yamamoto‐Kawai,et al.  Freshwater and brine behaviors in the Arctic Ocean deduced from historical data of δ18O and alkalinity (1929–2002 A.D.) , 2005 .

[180]  S. Bacon,et al.  The Arctic Ocean carbon sink , 2014 .

[181]  Mark A. Johnson,et al.  Arctic decadal variability: An auto‐oscillatory system of heat and fresh water exchange , 2004 .

[182]  J. Dufresne,et al.  Causes and impacts of changes in the Arctic freshwater budget during the twentieth and twenty-first centuries in an AOGCM , 2007 .

[183]  E. Carmack,et al.  The ‘interior’ shelves of the Arctic Ocean: Physical oceanographic setting, climatology and effects of sea-ice retreat on cross-shelf exchange , 2015 .

[184]  T. Dittmar,et al.  The biogeochemistry of the river and shelf ecosystem of the Arctic Ocean: a review , 2003 .

[185]  J. Toole,et al.  Influences of the ocean surface mixed layer and thermohaline stratification on Arctic Sea ice in the central Canada Basin , 2010 .

[186]  Eric F. Wood,et al.  Observational evidence of an intensifying hydrological cycle in northern Canada , 2009 .

[187]  A. Barrett,et al.  Characteristics of the Beaufort Sea High , 2011 .

[188]  S. Griffies,et al.  Challenges to Understanding the Dynamic Response of Greenland's Marine Terminating Glaciers to Oceanic and Atmospheric Forcing , 2013 .

[189]  S. Comeau,et al.  Effects of ocean acidification on overwintering juvenile Arctic pteropods Limacina helicina , 2012 .

[190]  K. Drinkwater,et al.  Effects of the Hudson Strait outflow on the biology of the Labrador Shelf , 2001 .

[191]  Leif G. Anderson,et al.  Formation and evolution of the surface mixed layer and halocline of the Arctic Ocean , 1996 .

[192]  M. Spall,et al.  Dynamics of upwelling in the Alaskan Beaufort Sea and associated shelf–basin fluxes , 2013 .

[193]  Frank Kauker,et al.  An assessment of Arctic Ocean freshwater content changes from the 1990s to the 2006-2008 period and beyond , 2011 .

[194]  E. Carmack,et al.  Freshwater budget of the Canada Basin, Arctic Ocean, from salinity, δ18O, and nutrients , 2008 .

[195]  Pierre Rampal,et al.  IPCC climate models do not capture Arctic sea ice drift acceleration: Consequences in terms of projected sea ice thinning and decline , 2011 .

[196]  S. C. Gerlach,et al.  Arctic system on trajectory to new, seasonally ice‐free state , 2005 .

[197]  Peter Winsor,et al.  Mixing across the Arctic Ocean: Microstructure observations during the Beringia 2005 Expedition , 2008 .

[198]  H. Kassens,et al.  Sediments in Arctic sea ice: Implications for entrainment, transport and release , 1994 .

[199]  ’. ROSSD.BROWN.  Interannual Variability of Landfast Ice Thickness in the Canadian High Arctic , 1950-89 , 2006 .

[200]  D. M. Lawrence,et al.  Climate change and the permafrost carbon feedback , 2014, Nature.

[201]  C. Symon,et al.  Arctic climate impact assessment , 2005 .

[202]  N. Bates,et al.  Coupling primary production and terrestrial runoff to ocean acidification and carbonate mineral suppression in the eastern Bering Sea , 2011 .

[203]  R. Barry,et al.  Processes and impacts of Arctic amplification: A research synthesis , 2011 .

[204]  John M. Wallace,et al.  Arctic Ocean Circulation Patterns Revealed by GRACE , 2014 .

[205]  Michael Karcher,et al.  Arctic freshwater export: Status, mechanisms, and prospects , 2015 .

[206]  Taro Takahashi,et al.  Rate of Iceland Sea acidification from time series measurements , 2009 .

[207]  Duncan J. Wingham,et al.  Western Arctic Ocean freshwater storage increased by wind-driven spin-up of the Beaufort Gyre , 2012 .

[208]  J. Morison,et al.  The return of Pacific waters to the upper layers of the central Arctic Ocean , 2007 .

[209]  E. Carmack,et al.  Wind‐driven shelf/basin exchange on an Arctic shelf: The joint roles of ice cover extent and shelf‐break bathymetry , 2003 .

[210]  E. Carmack,et al.  The role of sea ice and other fresh water in the Arctic circulation , 1989 .

[211]  Eric F. Wood,et al.  A pan‐arctic evaluation of changes in river discharge during the latter half of the 20th century , 2005 .

[212]  M. Prange,et al.  Arctic river discharge trends since 7ka BP , 2011 .

[213]  A. Shiklomanov,et al.  River Discharge, Arctic Report Card: Update for 2011 , 2011 .

[214]  E. Wood,et al.  Characteristics and Trends of River Discharge into Hudson, James, and Ungava Bays, 1964–2000 , 2005 .

[215]  E. Carmack,et al.  Deterioration of perennial sea ice in the Beaufort Gyre from 2003 to 2012 and its impact on the oceanic freshwater cycle , 2014 .

[216]  E. Carmack,et al.  Pacific Ocean inflow: Influence on catastrophic reduction of sea ice cover in the Arctic Ocean , 2006 .

[217]  S. Vavrus,et al.  Evidence linking Arctic amplification to extreme weather in mid‐latitudes , 2012 .

[218]  Axel Schweiger,et al.  Evaluation of Seven Different Atmospheric Reanalysis Products in the Arctic , 2014 .

[219]  B. Bluhm,et al.  Regional benthic food web structure on the Alaska Beaufort Sea shelf , 2015 .

[220]  Ron Kwok,et al.  Multiyear Volume, Liquid Freshwater, and Sea Ice Transports through Davis Strait, 2004–10* , 2014 .

[221]  G. Moore,et al.  Upwelling on the continental slope of the Alaskan Beaufort Sea: Storms, ice, and oceanographic response , 2009 .

[222]  Larry D. Hinzman,et al.  An arctic hydrologic system in transition: Feedbacks and impacts on terrestrial, marine, and human life , 2009 .

[223]  C. Cenedese,et al.  The Dynamics of Greenland's Glacial Fjords and Their Role in Climate. , 2015, Annual review of marine science.

[224]  Lawrence J. Pratt,et al.  Flow of winter-transformed Pacific water into the Western Arctic , 2005 .

[225]  Angelo Camerlenghi,et al.  The International Bathymetric Chart of the Arctic Ocean (IBCAO) Version 3.0 , 2012 .

[226]  Nicholas R. Bates,et al.  Summertime calcium carbonate undersaturation in shelf waters of the western Arctic Ocean – how biological processes exacerbate the impact of ocean acidification , 2012 .

[227]  P. Cummins,et al.  Simulated and experimental two-layer flows past isolated two-dimensional obstacles , 1994 .

[228]  Helen M. Snaith,et al.  A freshwater jet on the east Greenland shelf (abstract of paper presented at ASLO/AGU Ocean Sciences Meeting, Honolulu, HI, 11-15 Feb 2002) , 2002 .

[229]  Taro Takahashi,et al.  Convergence of atmospheric and North Atlantic carbon dioxide trends on multidecadal timescales , 2011 .

[230]  Michael P. Meredith,et al.  The large‐scale freshwater cycle of the Arctic , 2006 .

[231]  Andrew Kliskey,et al.  The Arctic freshwater system: Changes and impacts , 2007 .

[232]  S. Yamane,et al.  Influence of low Arctic sea‐ice minima on anomalously cold Eurasian winters , 2009 .

[233]  E. Carmack,et al.  Structures and property distributions in the three oceans surrounding Canada in 2007: A basis for a long‐term ocean climate monitoring strategy , 2010 .

[234]  E. Carmack,et al.  Winter Convection Transports Atlantic Water Heat to the Surface Layer in the Eastern Arctic Ocean , 2013 .

[235]  S. Bacon,et al.  Export of nutrients from the Arctic Ocean , 2013 .

[236]  V. Alexeev,et al.  Polar amplification: is atmospheric heat transport important? , 2013, Climate Dynamics.

[237]  Donald J. Cavalieri,et al.  Antarctic sea ice variability and trends, 1979-2010 , 2012 .

[238]  R. Macdonald,et al.  The Arctic Ocean Estuary , 2012, Estuaries and Coasts.

[239]  Donald K. Perovich,et al.  Surface freshening in the Arctic Ocean's Eurasian Basin: An apparent consequence of recent change in the wind-driven circulation , 2011 .

[240]  K. Sand,et al.  Changes to freshwater systems affecting Arctic infrastructure and natural resources , 2016 .

[241]  Mojib Latif,et al.  Formation and propagation of great salinity anomalies , 2003 .

[242]  Walter B. Tucker,et al.  Evidence for rapid thinning of sea ice in the western Arctic Ocean at the end of the 1980s , 2001 .

[243]  L. Hamilton.  Trends in Arctic sea ice extent , 2011 .

[244]  D. Barber,et al.  A conceptual model of an Arctic sea , 2012 .

[245]  R. Macdonald,et al.  Distribution and sources of organic matter in surface marine sediments across the North American Arctic margin , 2013 .

[246]  S. Pfirman,et al.  The northern Barents Sea: Water mass distribution and modification , 2013 .

[247]  T. Huntington.  Evidence for intensification of the global water cycle: Review and synthesis , 2006 .

[248]  Cecilie Mauritzen,et al.  Dilution of the Northern North Atlantic Ocean in Recent Decades , 2005, Science.

[249]  J. Francis,et al.  The Arctic Amplification Debate , 2006 .

[250]  E. Carmack,et al.  Climate change impacts on the Beaufort shelf landfast ice , 2005 .

[251]  R. Macdonald,et al.  The Canada Basin, 1989–1995: Upstream events and far‐field effects of the Barents Sea , 2002 .

[252]  E. Rachor,et al.  Current state of zoobenthos in two estuarine bays of the Barents and Kara Seas , 1999 .

[253]  Paul Wassmann,et al.  Arctic Tipping Points in an Earth System Perspective , 2012, AMBIO.

[254]  L. Anderson,et al.  East Siberian Sea, an Arctic region of very high biogeochemical activity , 2011 .

[255]  E. Carmack,et al.  Smallest Algae Thrive As the Arctic Ocean Freshens , 2009, Science.

[256]  D. Dumont,et al.  Contribution of subsurface chlorophyll maxima to primary production in the coastal Beaufort Sea (Canadian Arctic): A model assessment , 2013 .

[257]  Ron Kwok,et al.  Thinning and volume loss of the Arctic Ocean sea ice cover: 2003–2008 , 2009 .

[258]  R. Schlitzer,et al.  River runoff influence on the water mass formation in the Kara Sea , 2003 .

[259]  C. Greene,et al.  Climate Drives Sea Change , 2007, Science.

[260]  Wilken-Jon von Appen,et al.  Two Configurations of the Western Arctic Shelfbreak Current in Summer , 2012 .

[261]  Ron Kwok,et al.  Fram Strait sea ice outflow , 2004 .

[262]  H. Melling.  Sea-Ice Observation: Advances and Challenges , 2012 .

[263]  Ron Kwok,et al.  Arctic sea ice circulation and drift speed: Decadal trends and ocean currents , 2013 .

[264]  E. Carmack,et al.  Effects of ocean acidification, warming and melting of sea ice on aragonite saturation of the Canada Basin surface water , 2011 .

[265]  David M. Lawrence,et al.  The Seasonal Atmospheric Response to Projected Arctic Sea Ice Loss in the Late Twenty-First Century , 2010 .

[266]  K. Aagaard,et al.  Some thoughts on the freezing and melting of sea ice and their effects on the ocean , 2001 .

[267]  I. Polyakov,et al.  Structure and variability of the boundary current in the Eurasian Basin of the Arctic Ocean , 2015 .

[268]  L. Anderson,et al.  The saturation of calcite and aragonite in the Arctic Ocean , 2005 .

[269]  C. Guéguen,et al.  Colored dissolved organic matter dynamics across the shelf‐basin interface in the western Arctic Ocean , 2007 .

[270]  P. Craig.  Fish Use of Coastal Waters of the Alaskan Beaufort Sea: A Review , 1984 .

[271]  Paul Wassmann,et al.  Food webs and physical–biological coupling on pan-Arctic shelves: Unifying concepts and comprehensive perspectives ☆ , 2006 .

[272]  D. Rothrock,et al.  Thinning of the Arctic sea‐ice cover , 1999 .

[273]  E. Carmack,et al.  Towards recognition of physical and geochemical change in Subarctic and Arctic Seas , 2011 .

[274]  Peter Lemke,et al.  Sea-ice roughness and drag coefficients in a dynamic–thermodynamic sea-ice model for the Arctic , 1999 .

[275]  B. Rudels,et al.  Stratification and water mass formation in the Arctic Ocean: some implications for the nutrient distribution , 1991 .

[276]  I. Polyakov,et al.  Recent oceanic changes in the Arctic in the context of long-term observations. , 2013, Ecological applications : a publication of the Ecological Society of America.

[277]  H. Melling,et al.  The effect of structural porosity on the ablation of sea ice ridges , 2006 .

[278]  E. Carmack,et al.  The contiguous panarctic Riverine Coastal Domain: A unifying concept , 2015 .

[279]  Muyin Wang,et al.  When will the summer Arctic be nearly sea ice free? , 2013 .

[280]  Hajo Eicken,et al.  Modern terrigenous organic carbon input to the Arctic Ocean , 2003 .

[281]  Jonathan M. Gregory,et al.  Response of the North Atlantic storm track to climate change shaped by ocean–atmosphere coupling , 2012 .

[282]  R. Macdonald,et al.  Waters of the Makarov and Canada basins , 1997 .

[283]  D. Quadfasel,et al.  The Arctic Circumpolar Boundary Current , 1999 .

[284]  John E. Walsh,et al.  Implications of Arctic Sea Ice Decline for the Earth System , 2014 .

[285]  Ron Kwok,et al.  Uncertainty in modeled Arctic sea ice volume , 2011 .

[286]  H. Melling,et al.  Ocean circulation within the North Water polynya of Baffin Bay , 2001 .

[287]  S. Bacon,et al.  Seasonal variability of the East Greenland Coastal Current , 2014 .

[288]  R. Macdonald,et al.  Phytoplankton productivity on the Canadian Shelf of the Beaufort Sea , 2004 .

[289]  Andrew C. Coward,et al.  The Arctic Circumpolar Boundary Current , 2011 .

[290]  Paul Linden,et al.  The stability of buoyancy-driven coastal currents , 1981 .

[291]  A. Proshutinsky,et al.  The role of the Beaufort Gyre in Arctic climate variability: Seasonal to decadal climate scales , 2002 .

[292]  Ross D. Brown,et al.  Variability and climate sensitivity of landfast Arctic sea ice , 1996 .

[293]  Camille Li,et al.  Response of Arctic Ocean stratification to changing river runoff in a column model , 2015 .

[294]  M. Stieglitz,et al.  Increasing river discharge in the Eurasian Arctic: Consideration of dams, permafrost thaw, and fires as potential agents of change , 2004 .

[295]  S. Häkkinen,et al.  Wind-Driven Variability of the Large-Scale Recirculating Flow in the Nordic Seas and Arctic Ocean , 2003 .

[296]  J. Morison,et al.  Rapid change in freshwater content of the Arctic Ocean , 2009 .

[297]  Kelly Kenison Falkner,et al.  Wind‐driven transport pathways for Eurasian Arctic river discharge , 2001 .

[298]  E. Carmack.  The alpha/beta ocean distinction: A perspective on freshwater fluxes, convection, nutrients and productivity in high-latitude seas , 2007 .

[299]  G. Maykut,et al.  Some results from a time‐dependent thermodynamic model of sea ice , 1971 .

[300]  Eric Rignot,et al.  Recent large increases in freshwater fluxes from Greenland into the North Atlantic , 2010 .

[301]  Michael Steele,et al.  Retreat of the cold halocline layer in the Arctic Ocean , 1998 .

[302]  H. Melling,et al.  Shelf drainage flows in the Beaufort Sea and their effect on the Arctic Ocean pycnocline , 1982 .

[303]  G. Destouni,et al.  Integrated assessment of changes in freshwater inflow to the Arctic Ocean , 2010 .

[304]  E. Carmack,et al.  Arctic Freshwater Synthesis: Summary of key emerging issues , 2015 .

[305]  Peter Schlosser,et al.  River runoff, sea ice meltwater, and Pacific water distribution and mean residence times in the Arctic Ocean , 2001 .

[306]  P. Laan,et al.  Dissolved iron in the Arctic shelf seas and surface waters of the central Arctic Ocean : Impact of Arctic river water and ice-melt , 2012 .

[307]  M. Mcphee.  Intensification of Geostrophic Currents in the Canada Basin, Arctic Ocean , 2013 .

[308]  J. Curry,et al.  Impact of declining Arctic sea ice on winter snowfall , 2012, Proceedings of the National Academy of Sciences.

[309]  T. Parsons,et al.  Production studies in the Mackenzie River — Beaufort Sea estuary , 2004, Polar Biology.

[310]  E. Carmack,et al.  Winter sea‐ice melt in the Canada Basin, Arctic Ocean , 2012 .

[311]  E. Carmack,et al.  Ocean acidification in the three oceans surrounding northern North America , 2013 .

[312]  H. Hasumi,et al.  Pacific Water Transport in the Western Arctic Ocean Simulated by an Eddy-Resolving Coupled Sea Ice–Ocean Model , 2009 .

[313]  Frank Kauker,et al.  Arctic Ocean basin liquid freshwater storage trend 1992–2012 , 2014 .

[314]  H. Melling,et al.  The Arctic Ocean—a Canadian perspective from IPY , 2012, Climatic Change.

[315]  Michael Karcher,et al.  A Synthesis of Exchanges Through the Main Oceanic Gateways to the Arctic Ocean , 2011 .

[316]  Richard A. Wood,et al.  Global Climatic Impacts of a Collapse of the Atlantic Thermohaline Circulation , 2002 .

[317]  D. A. Rothrock,et al.  Modeling Global Sea Ice with a Thickness and Enthalpy Distribution Model in Generalized Curvilinear Coordinates , 2003 .

[318]  Terry D. Prowse,et al.  Arctic terrestrial hydrology : A synthesis of processes, regional effects, and research challenges , 2016 .

[319]  A. Casper,et al.  Variation and Assimilation of Arctic Riverine Sestonin the Pelagic Food Web of the Mackenzie River Delta and Beaufort Sea Transition Zone , 2015, Estuaries and Coasts.

[320]  Corinne Le Quéré,et al.  Climate Change 2013: The Physical Science Basis , 2013 .

[321]  E. Carmack,et al.  Kugmallit Valley as a conduit for cross‐shelf exchange on the Mackenzie Shelf in the Beaufort Sea , 2008 .

[322]  J. Walsh,et al.  Trajectory Shifts in the Arctic and Subarctic Freshwater Cycle , 2006, Science.

[323]  G. Kattner,et al.  Disappearance of Pacific Water in the northwestern Fram Strait , 2005 .

[324]  I. Myers-Smith,et al.  Transitions in Arctic ecosystems: Ecological implications of a changing hydrological regime , 2016 .

[325]  N. Bates,et al.  Ocean acidification and biologically induced seasonality of carbonate mineral saturation states in the western Arctic Ocean , 2009 .

[326]  L. Miller,et al.  Changes in the marine carbonate system of the western Arctic: patterns in a rescued data set , 2014 .

[327]  E. Barnes.  Revisiting the evidence linking Arctic amplification to extreme weather in midlatitudes , 2013 .

[328]  Vladimir A. Alexeev,et al.  Role of Polar Amplification in Long-Term Surface Air Temperature Variations and Modern Arctic Warming , 2010 .

[329]  R. Garvine.  A dynamical system for classifying buoyant coastal discharges , 1995 .

[330]  S. Bacon,et al.  Tide-mediated warming of Arctic halocline by Atlantic heat fluxes over rough topography , 2015 .