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By Giacomo R. DiTullio, Robert B. Dunbar

Released through the yankee Geophysical Union as a part of the Antarctic learn sequence, quantity 78.

The seas surrounding Antarctica are the least-studied on the earth, but they determine prominently in either the worldwide weather process and the biogeochemical biking of such key parts as C, N, Si, and P. The Southern Ocean impacts weather without delay in the course of the sinking of floor waters through cooling and alterations in salt content material. Such water close to Antarctica strikes slowly northward via all significant ocean basins. In doing so, it keeps a long-lived signature of the actual and organic strategies that happened in Antarctic floor waters lasting many countless numbers of years via all levels: sinking, northward stream, and combining or upwelling into the sunlit ocean hundreds of thousands of kilometers away. by way of this strategy, CO2 that dissolves into the Antarctic seas can be saved within the deep ocean for hundreds of years. actually, the Southern Ocean is likely one of the most crucial areas in the world for the uptake and subsurface delivery of fossil gasoline CO2.

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Upper-ocean currents at Emperor appeared to be stronger during 1997, consistent with the stronger imposed wind forcing. 5) Reduced sea ice cover was observed north of the RIS during the 1996 and 1999 La Nina events and this reduction appeared to be responsible for enhance buoyancy forcing of the Ross Sea Polynya during those years. Moreover, during the same years, strong northeastward drift was observed at all available levels at site B'. Current meter measure­ ments are not available from the Ross Sea Polynya for those years, but based on model simulations it is hypothesized that enhanced dense water production in the polynya during 1996 and 1999 generated the northward flow through Joides Basin that was observed at B'.

Van Woert for their help in collecting the ROAVERRS hydrographic data sets and D. Mucciarone for his help with the current meter deployment and recovery. D. Chapman and T. Mavor provided helpful comments on the nature of shelf dynamics and two anonymous reviewers pro­ vided valuable comments on an earlier version of this manu­ script. C. Steam's group at the University of Wisconsin pro­ vided the automatic weather station data, the National Center for Atmospheric Research provided the ECMWF data, and the SSM/I-derived sea ice data were provided by the EOSDIS NSIDC Distributed Active Archive Center (NSIDC DAAC), University of Colorado.

Here we exam­ ine variability on the Ross Sea continental shelf using th th 24 BIOGEOCHEMISTRY OF THE ROSS SEA highly variable but generally westward or northwest­ w a r d at m o s t l o c a t i o n s a l o n g t h e shelf. T h e c u r r e n t intensifies as it p a s s e s R o s s I s l a n d r e s u l t i n g in s t r o n g n o r t h w a r d flow a l o n g t h e V i c t o r i a L a n d coast. T h i s cir­ c u l a t i o n p a t t e r n is b r o a d l y c o n s i s t e n t w i t h t h e c i r c u l a ­ t i o n p a t t e r n d e r i v e d from i c e b e r g drift [Keys et al, 1 9 9 0 ] , b u o y drift [Moritz, 1 9 8 8 ] , s h i p drift [Wordie, 1921], and current meter data collected along the shelf [Pillsbury and Jacobs, 1985; Locarnini, 1994].

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