Halocline structure in the Canada Basin of the Arctic Ocean

We examine the varieties and spatial distributions of Pacific and Eastern Arctic origin halocline waters in the Canada Basin using 2002–2003 hydrographic data. The halocline structure in the Canada Basin is different from the Eastern Arctic halocline because it includes fresher Pacific Winter Waters that form a “cold halostad” which lies above the Eastern Arctic origin lower halocline waters. The structure of the halostad in the Canada Basin, however, is not spatially uniform, and depends on the pathway and history of the source water. Pacific Winter Water entering through the Bering Strait becomes salty due to sea ice formation and this, in turn, is dependent on the occurrence and distribution of polynyas. In particular, saline water from the eastern Chukchi Sea forms thick halostad and causes depression of the isohalines in the southern Canada Basin. This depression influences thermohaline structure of the oceanic Beaufort Gyre.

[1]  K. Aagaard,et al.  Revising the Bering Strait freshwater flux into the Arctic Ocean , 2005 .

[2]  Ron Kwok,et al.  Estimation of the thin ice thickness and heat flux for the Chukchi Sea Alaskan coast polynya from Special Sensor Microwave/Imager data, 1990–2001 , 2004 .

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

[4]  E. Carmack,et al.  Varieties of shallow temperature maximum waters in the Western Canadian Basin of the Arctic Ocean , 2001 .

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

[6]  Donald J. Cavalieri,et al.  Circulation, dense water formation, and outflow on the northeast Chukchi Shelf , 1998 .

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

[8]  Donald J. Cavalieri,et al.  The contribution of Alaskan, Siberian, and Canadian coastal polynyas to the cold halocline layer of the Arctic Ocean , 1994 .

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

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

[11]  R. Macdonald,et al.  The joint roles of Pacific and Atlantic-origin waters in the Canada Basin, 1997–1998 , 2004 .

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

[13]  T. Aldrich,et al.  Woods Hole Oceanographic Institution , 1958, Nature.