Freshwater content variability in the Arctic Ocean

[1] Arctic Ocean model simulations have revealed that the Arctic Ocean has a basin-wide oscillation with cyclonic and anticyclonic circulation anomalies (Arctic Ocean Oscillation (AOO)) that has a prominent decadal variability [Proshutinsky and Johnson, 1997]. This study explores how the simulated AOO affects the Arctic Ocean stratification and its relationship to the sea ice cover variations. The simulation uses the Princeton Ocean Model coupled to sea ice [Hakkinen and Mellor, 1992; Hakkinen, 1999]. The surface forcing is based on National Centers for Environmental Prediction/National Center for Atmospheric Research Reanalysis and its climatology, of which the latter is used to force the model spin-up phase. Our focus is to investigate the competition between ocean dynamics and ice formation/melt on the Arctic basin-wide freshwater balance. We find that changes in the Atlantic water inflow can explain almost all of the simulated freshwater anomalies in the main Arctic basin. The Atlantic water inflow anomalies are an essential part of AOO, which is the wind driven barotropic response to the Arctic Oscillation (AO). The baroclinic response to AO, such as Ekman pumping in the Beaufort Gyre, and ice melt/freeze anomalies in response to AO are less significant considering the whole Arctic freshwater balance.

[1]  T. Vinje.  Fram Strait Ice Fluxes and Atmospheric Circulation: 1950–2000 , 2001 .

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

[3]  K. Aagaard,et al.  Transports through Bering Strait: Annual and interannual variability , 1988 .

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

[5]  M. Holland,et al.  The Role of Ice-Ocean Interactions in the Variability of the North Atlantic Thermohaline Circulation , 2001 .

[6]  S. Häkkinen.  An Arctic source for the great salinity anomaly: A simulation of the Arctic ice‐ocean system for 1955–1975 , 1993 .

[7]  Robert R. Dickson,et al.  Long-term coordinated changes in the convective activity of the North Atlantic , 1996 .

[8]  S. Häkkinen,et al.  Simulated low‐frequency modes of circulation in the Arctic Ocean , 2000 .

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

[10]  S. Häkkinen.  Surface salinity variability in the northern North Atlantic during recent decades , 2002 .

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

[12]  H. Goosse,et al.  A mechanism of decadal variability of the sea-ice volume in the Northern Hemisphere , 2002 .

[13]  D. Martinson,et al.  Modeling recent climate variability in the Arctic Ocean , 2000 .

[14]  S. Häkkinen.  Decadal Air-Sea Interaction in the North Atlantic Based on Observations and Modeling Results , 2000 .

[15]  John E. Walsh,et al.  Numerical simulation of northern hemisphere sea ice variability, 1951–1980 , 1985 .

[16]  C. Hannah,et al.  Hydrographic and transport variability on the Halifax section , 2003 .

[17]  S. Häkkinen.  Variability of the simulated meridional heat transport in the North Atlantic for the period 1951–1993 , 1999 .

[18]  G. Mellor,et al.  Development of a turbulence closure model for geophysical fluid problems , 1982 .

[19]  George L. Mellor,et al.  Modeling the seasonal variability of a coupled Arctic ice‐ocean system , 1992 .

[20]  J. Wallace,et al.  Response of Sea Ice to the Arctic Oscillation , 2002 .

[21]  P. Lemke,et al.  On the decrease of Arctic sea ice volume , 2000 .

[22]  R. B. Tripp,et al.  Bering Strait the Regional Physical Oceanography , 1975 .

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

[24]  S. Häkkinen,et al.  Influence of sea ice on the thermohaline circulation in the Arctic‐North Atlantic Ocean , 1997 .

[25]  Marvin L. Johnson,et al.  Seasonal cycles in two regimes of Arctic climate , 1999 .

[26]  Richard B. Lammers,et al.  THE DYNAMICS OF RIVER WATER INFLOW TO THE ARCTIC OCEAN , 2000 .

[27]  R. Macdonald,et al.  Evidence for warming of Atlantic water in the Southern Canadian Basin of the Arctic Ocean: Results from the Larsen-93 Expedition , 1995 .

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