The World Ocean Database(WOD) is used to evaluate the halocline depth simulated by an ice-ocean coupled model in the Canada Basin during 1990–2008. Statistical results show that the simulated halocline is reliable.Co...The World Ocean Database(WOD) is used to evaluate the halocline depth simulated by an ice-ocean coupled model in the Canada Basin during 1990–2008. Statistical results show that the simulated halocline is reliable.Comparing of the September sea ice extent between simulation and SSM/I dataset, a consistent interannual variability is found between them. Moreover, both the simulated and observed September sea ice extent show staircase declines in 2000–2008 compared to 1990–1999. That supports that the abrupt variations of the ocean surface stress curl anomaly in 2000–2008 are caused by rapid sea ice melting and also in favor of the realistic existence of the simulated variations. Responses to these changes can be found in the upper ocean circulation and the intermediate current variations in these two phases as well. The analysis shows that seasonal variations of the halocline are regulated by the seasonal variations of the Ekman pumping. On interannual time scale, the variations of the halocline have an inverse relationship with the ocean surface stress curl anomaly after 2000,while this relationship no longer applies in the 1990 s. It is pointed out that the regime shift in the Canada Basin can be derived to illustrate this phenomenon. Specifically, the halocline variations are dominated by advection in the 1990 s and Ekman pumping in the 2000 s respectively. Furthermore, the regime shift is caused by changing Transpolar Drift pathway and Ekman pumping area due to spatial deformation of the center Beaufort high(BH)relative to climatology.展开更多
Summary of results from a high-resolution pan-Arctic ice-ocean model are presented for the northern North Pacific,Bering,Chukchi,and Beaufort seas. The main focus is on the mean circulation,communication from the Gulf...Summary of results from a high-resolution pan-Arctic ice-ocean model are presented for the northern North Pacific,Bering,Chukchi,and Beaufort seas. The main focus is on the mean circulation,communication from the Gulf of Alaska across the Bering Sea into the western Arctic Ocean and on mesoscale eddy activity within several important ecosystems.Model results from 1979-2004 are compared to observations whenever possible.The high spatial model resolution at 1/12o(or～9- km) in the horizontal and 45 levels in the vertical direction allows for representation of eddies with diameters as small as 36 km.However,we believe that upcoming new model integrations at even higher resolution will allow us to resolve even smaller eddies .This is especially important at the highest latitudes where the Rossby radius of deformation is as small as 10 km or less.展开更多
基金supported by the Chinese-Norwegian Collaboration Projects within Climate Systems jointly funded by the National Key Research and Development Program of China[grant number 2022YFE0106800]the National Natural Science Foundation of China[grant number 42088101]+1 种基金a Research Council of Norway funded project(MAPARC)[grant number 328943]the Innovation Group Project of the Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)[grant number 311020001].
基金The National Basic Research Program(973 Program)of China under contract No.2015CB953900the National Natural Science Foundation of China under contract No.41330960
文摘The World Ocean Database(WOD) is used to evaluate the halocline depth simulated by an ice-ocean coupled model in the Canada Basin during 1990–2008. Statistical results show that the simulated halocline is reliable.Comparing of the September sea ice extent between simulation and SSM/I dataset, a consistent interannual variability is found between them. Moreover, both the simulated and observed September sea ice extent show staircase declines in 2000–2008 compared to 1990–1999. That supports that the abrupt variations of the ocean surface stress curl anomaly in 2000–2008 are caused by rapid sea ice melting and also in favor of the realistic existence of the simulated variations. Responses to these changes can be found in the upper ocean circulation and the intermediate current variations in these two phases as well. The analysis shows that seasonal variations of the halocline are regulated by the seasonal variations of the Ekman pumping. On interannual time scale, the variations of the halocline have an inverse relationship with the ocean surface stress curl anomaly after 2000,while this relationship no longer applies in the 1990 s. It is pointed out that the regime shift in the Canada Basin can be derived to illustrate this phenomenon. Specifically, the halocline variations are dominated by advection in the 1990 s and Ekman pumping in the 2000 s respectively. Furthermore, the regime shift is caused by changing Transpolar Drift pathway and Ekman pumping area due to spatial deformation of the center Beaufort high(BH)relative to climatology.
基金the U.S.National Science Foundation/Shelf-Basin Interactions (SBI) Program for primary support of this researchAdditional support has been provided through other National Science Foundation Office of Polar Program(OPP) grants,the U.S+3 种基金Department of Energy Climate Change Prediction Program(CCPP)National Aeronautics and Space Administration Ocean and Ice ProgramComputer resources were provided by the Arctic Region Supercomputing Center(ARSC) through the U.S.Department of Defense High Performance Computer Modernization Program(HPCMP).
文摘Summary of results from a high-resolution pan-Arctic ice-ocean model are presented for the northern North Pacific,Bering,Chukchi,and Beaufort seas. The main focus is on the mean circulation,communication from the Gulf of Alaska across the Bering Sea into the western Arctic Ocean and on mesoscale eddy activity within several important ecosystems.Model results from 1979-2004 are compared to observations whenever possible.The high spatial model resolution at 1/12o(or～9- km) in the horizontal and 45 levels in the vertical direction allows for representation of eddies with diameters as small as 36 km.However,we believe that upcoming new model integrations at even higher resolution will allow us to resolve even smaller eddies .This is especially important at the highest latitudes where the Rossby radius of deformation is as small as 10 km or less.
