Extent and variability of the meridional Atlantic circulation in the eastern Nordic seas during Marine Isotope Stage 5 and its influence on the inception of the last glacial

Variable climatic and oceanographic conditions characterized the last interglacial at high northern latitudes, probably related to changes in the strength of the Atlantic Meridional Overturning Circulation (AMOC). The magnitudes of these changes are comparable to the Holocene variability, and were thus significantly subdued compared to glacial climate changes. A thermal optimum occurred during the early part of the interglacial, followed by a period of reduced Atlantic inflow to the northernmost Nordic Seas. Subsequently, a new period with increased strength of the AMOC occurred. Significant amounts of Ice-Rafted Debris (IRD) were deposited in the northernmost Nordic Seas before any major change of the global ice volume. This implies an early onset of local ice sheet growth, probably the result of enhanced inflow of Atlantic water to the northernmost Nordic Seas contemporary with a Northern Hemisphere summer insolation minimum. Contrasting sea-land conditions provided large moisture fluxes towards land, giving rise to rapid, early glacial growth. Throughout the glacial part of Marine Isotope Stage (MIS) 5, millennial-scale cold events occurred along the axis of the warm water transport, from the subtropics all the way to the northernmost Nordic Seas. Correlation of IRD events from sites in the Fram Strait, on the Voring Plateau, and in the North Atlantic provides evidence that the major Northern Hemisphere ice sheets at times responded coherently to the same forcing. The widespread distribution of these events highlights the importance of the oceanic influence on the regional climate system.

[1]  G. Gard.  Late quaternary calcareous nannofossil biozonation, chronology and palaeo-oceanography in areas north of the faeroe-iceland ridge , 1988 .

[2]  Peter U. Clark,et al.  The role of the thermohaline circulation in abrupt climate change , 2002, Nature.

[3]  E. Jansen,et al.  Rapid changes in the mechanism of ocean convection during the last glacial period , 1999, Nature.

[4]  J. Duplessy,et al.  Response of global deep-water circulation to Earth's climatic change 135,000–107,000 years ago , 1985, Nature.

[5]  A. Mcintyre,et al.  Warmth of the Subpolar North Atlantic Ocean During Northern Hemisphere Ice-Sheet Growth , 1979, Science.

[6]  S. Østerhus,et al.  Greenland-Scotland overflow studied by hydro-chemical multivariate analysis , 2003 .

[7]  R. Alley,et al.  Electrical conductivity measurements from the GISP2 and GRIP Greenland ice cores , 1993, Nature.

[8]  H. Drange,et al.  Modelling Late Cenozoic isostatic elevation changes in the Barents Sea and their implications for oceanic and climatic regimes: preliminary results , 2002 .

[9]  J. L. Cullen,et al.  A 0.5-million-year record of millennial-scale climate variability in the north atlantic , 1999, Science.

[10]  H. Kassens,et al.  Reflection of Scandinavian Ice Sheet Fluctuations in Norwegian Sea Sediments during the Past 150,000 Years , 1995, Quaternary Research.

[11]  E. Cortijo,et al.  Eemian cooling in the Norwegian Sea and North Atlantic ocean preceding continental ice-sheet growth , 1994, Nature.

[12]  A. Elverhøi,et al.  Moisture supply for northern ice-sheet growth during the Last Glacial Maximum , 1994, Nature.

[13]  W. Karlén.  Scandinavian glacial and climatic fluctuations during the Holocene , 1988 .

[14]  A. Weaver,et al.  On the causes of glacial inception at 116 kaBP , 2002 .

[15]  Kurt Lambeck,et al.  Timing and duration of the Last Interglacial: evidence for a restricted interval of widespread coral reef growth , 1998 .

[16]  H. Sejrup,et al.  Last interglacial and Holocene climatic development in the Norwegian Sea region: Ocean front movements and ice‐core data , 1995 .

[17]  R. Souchez.  Climate instability during the last interglacial period recorded in the GRIP ice core , 1993 .

[18]  D. Macayeal.  Binge/purge oscillations of the Laurentide Ice Sheet as a cause of the North Atlantic's Heinrich events , 1993 .

[19]  E. Boyle,et al.  Variability of the North Atlantic thermohaline circulation during the last interglacial period , 1997, Nature.

[20]  J. Jouzel,et al.  Climate variations in Europe over the past 140 kyr deduced from rock magnetism , 1994, Nature.

[21]  J. Jouzel,et al.  Evidence for general instability of past climate from a 250-kyr ice-core record , 1993, Nature.

[22]  H. Freund,et al.  The Eemian Interglaciation in Northwestern Germany , 2002, Quaternary Research.

[23]  G. Wefer,et al.  Late Quaternary paleoceanography in the Fram Strait , 1997 .

[24]  N. Nørgaard-Pedersen,et al.  Arctic Ocean deep-sea record of northern Eurasian ice sheet history , 2004 .

[25]  Across the Arctic front west of Spitsbergen: high-resolution CTD sections from 1998–2000 , 2001 .

[26]  J. L. Cullen,et al.  Persistent suborbital climate variability in marine isotope stage 5 and termination II , 2001 .

[27]  R. Henrich,et al.  PALEOCEANOGRAPHY OF THE LAST INTERGLACIAL/GLACIAL CYCLE IN THE POLAR NORTH ATLANTIC , 1998 .

[28]  M. Bender,et al.  Carbon and oxygen isotopic disequilibria of recent deep-sea benthic foraminifera☆ , 1981 .

[29]  Martin Jakobsson,et al.  Late quaternary ice sheet history of northern Eurasia , 2004 .

[30]  J. Duplessy,et al.  Holocene paleoceanography of the northern Barents Sea and variations of the northward heat transport by the Atlantic Ocean , 2001 .

[31]  J. Swift.  The Arctic Waters , 1986 .

[32]  E. Jansen,et al.  Eemian and Early Weichselian (140–60 ka) Paleoceanography and paleoclimate in the Nordic Seas with comparisons to Holocene conditions , 1997 .

[33]  Stefan Rahmstorf,et al.  Rapid changes of glacial climate simulated in a coupled climate model , 2001, Nature.

[34]  J. Mangerud,et al.  The last interglacial-glacial period on spitsbergen, Svalbard , 1992 .

[35]  Jacques Laskar,et al.  The chaotic motion of the solar system: A numerical estimate of the size of the chaotic zones , 1990 .

[36]  E. Jansen,et al.  The Relationship between Surface Water Masses, Oceanographic Fronts and Paleoclimatic Proxies in Surface Sediments of the Greenland, Iceland, Norwegian Seas , 1994 .

[37]  A. Mcintyre,et al.  Oceanic Evidence for the Mechanism of Rapid Northern Hemisphere Glaciation , 1980, Quaternary Research.

[38]  Heidi Cullen,et al.  A Pervasive Millennial-Scale Cycle in North Atlantic Holocene and Glacial Climates , 1997 .

[39]  M. Chapman,et al.  Coherent deep flow variation in the Iceland and American basins during the last interglacial , 1998 .

[40]  E. Jansen,et al.  A high‐resolution study of Holocene paleoclimatic and paleoceanographic changes in the Nordic Seas , 2003 .

[41]  J. Blindheim.  Arctic intermediate water in the Norwegian sea , 1990 .

[42]  B. Huntley,et al.  Eemian climate fluctuations observed in a European pollen record , 1994, Nature.

[43]  N. Koç,et al.  A high‐resolution diatom record of late‐Quaternary sea‐surface temperatures and oceanographic conditions from the eastern Norwegian Sea , 2002 .

[44]  J. Peacock,et al.  INTERGLACIAL AND GLACIAL CLIMATE OSCILLATIONS IN A MARINE SHELF SEQUENCE FROM NORTHERN DENMARK : A MULTIDISCIPLINARY STUDY , 1998 .

[45]  E. Jansen,et al.  A high‐resolution diatom record of the last deglaciation from the SE Norwegian Sea: Documentation of rapid climatic changes , 1992 .

[46]  P. Mayewski,et al.  Climate correlations between Greenland and Antarctica during the past 100,000 years , 1994, Nature.

[47]  E. Boyle,et al.  On the Structure and Origin of Major Glaciation Cycles 1. Linear Responses to Milankovitch Forcing , 1992 .

[48]  M. Hald,et al.  Recent calcium carbonate dissolution in the Barents Sea: Paleoceanographic applications , 1994 .

[49]  J. D. Hays,et al.  Age Dating and the Orbital Theory of the Ice Ages: Development of a High-Resolution 0 to 300,000-Year Chronostratigraphy , 1987, Quaternary Research.

[50]  E. Jansen,et al.  Rapid changes in ocean circulation and heat flux in the Nordic seas during the last interglacial period , 1996, Nature.

[51]  R. Spielhagen,et al.  The Enigma of Oxygen Isotope Stage 5 in the Central Fram Strait , 1990 .

[52]  E. Boyle,et al.  Relation of subtropical Atlantic temperature, high-latitude ice rafting, deep water formation, and European climate 130,000-60,000 years ago , 2002 .

[53]  A. Murray,et al.  The chronology of a large ice-dammed lake and the Barents–Kara Ice Sheet advances, Northern Russia , 2001 .

[54]  L. Keigwin,et al.  Evidence from Fram Strait (78° N) for early deglaciation , 1988, Nature.

[55]  J. Dowdeswell,et al.  Modelling the Eurasian Ice Sheet through a full Weichselian glacial cycle , 2001 .

[56]  S. Lehman,et al.  Marine core evidence for reduced deep water production during Termination II followed by a relatively stable substage 5e (Eemian) , 1997 .

[57]  S. Manabe,et al.  Coupled ocean‐atmosphere model response to freshwater input: Comparison to Younger Dryas Event , 1997 .

[58]  S. Dahl,et al.  The ‘Little Ice Age’ – only temperature? , 2003 .

[59]  S. Østerhus,et al.  Upper layer cooling and freshening in the Norwegian Sea in relation to atmospheric forcing , 2000 .

[60]  J. L. Cullen,et al.  Thermohaline Circulation and Prolonged Interglacial Warmth in the North Atlantic , 2002, Quaternary Research.

[61]  M. Schulz,et al.  Amplitude variations of 1470‐year climate oscillations during the last 100,000 years linked to fluctuations of continental ice mass , 1999 .

[62]  M. Chapman,et al.  Global ice-volume fluctuations, North Atlantic ice-rafting events, and deep-ocean circulation changes between 130 and 70 ka , 1999 .

[63]  Nicholas J Shackleton,et al.  Oxygen Isotope and Palaeomagnetic Stratigraphy of Equatorial Pacific Core V28-238: Oxygen Isotope Temperatures and Ice Volumes on a 105 Year and 106 Year Scale , 1973, Quaternary Research.

[64]  N. Shackleton,et al.  Marine Isotope Substage 5e and the Eemian Interglacial , 2003 .

[65]  J. Oerlemans,et al.  Global ice volume variations through the last glacial cycle simulated by a 3-D ice-dynamical model , 2002 .

[66]  L. Mysak,et al.  Simulation of the last glacial inception and rapid ice sheet growth in the McGill Paleoclimate Model , 2002 .

[67]  T. Litt,et al.  Multiproxy climate reconstructions for the Eemian and Early Weichselian , 1998 .

[68]  R. Spielhagen,et al.  The Growth and Decay of the Late Weichselian Ice Sheet in Western Svalbard and Adjacent Areas Based on Provenance Studies of Marine Sediments , 1995, Quaternary Research.

[69]  J. Dowdeswell,et al.  Maximum extent of the Eurasian ice sheets in the Barents and Kara Sea region during the Weichselian , 1999 .

[70]  J. Jouzel,et al.  Comparison of oxygen isotope records from the GISP2 and GRIP Greenland ice cores , 1993, Nature.

[71]  W. Broecker,et al.  High-resolution climate records from the North Atlantic during the last interglacial , 1994, Nature.

[72]  M. Weinelt,et al.  Evidence for a steeper Eemian than Holocene sea surface temperature gradient between Arctic and sub-Arctic regions , 1999 .

[73]  T. Manley.  Branching of Atlantic Water within the Greenland‐Spitsbergen Passage: An estimate of recirculation , 1995 .

[74]  D. Rothrock,et al.  Warming of the Arctic Ocean by a strengthened Atlantic Inflow: Model results , 1998 .

[75]  E. Jansen,et al.  Paleoenvironmental changes in the Norwegian Sea and the northeast Atlantic during the last 2.8 m.y.: Deep Sea Drilling Project/Ocean Drilling Program Sites 610, 642, 643 and 644 , 1988 .

[76]  K. Knudsen,et al.  Marine evidence for climatic instability during the last interglacial in shelf records from northwest Europe , 1995 .

[77]  T. Vorren,et al.  FLUCTUATIONS OF THE SVALBARD–BARENTS SEA ICE SHEET DURING THE LAST 150 000 YEARS , 1998 .

[78]  H. Sejrup,et al.  Quaternary glaciations in southern Fennoscandia: evidence from southwestern Norway and the northern North Sea region , 2000 .

[79]  G. Burr,et al.  Rapid sea-level fall and deep-ocean temperature change since the last interglacial period , 2003 .

[80]  G. Ramstein,et al.  Simulating the amplification of orbital forcing by ocean feedbacks in the last glaciation , 2001, Nature.

[81]  H. Drange,et al.  Effects of solar irradiance forcing on the ocean circulation and sea-ice in the North Atlantic in an isopycnic coordinate ocean general circulation model , 2004 .