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Structure of Boundary Current in the Nansen Basin of the Arctic Ocean

Structure of Boundary Current in the Nansen Basin of the Arctic Ocean
Type: 
Poster
Andrey V. Pnyushkov1, Igor V. Polyakov2, Vladimir V. Ivanov3
1International Arctic Research Center, University of Alaska Fairbanks, 930 Koyukuk Drive , Fairbanks, AK, 99775, USA, Phone 907-474-2683, andrey [at] iarc [dot] uaf [dot] edu
2International Arctic Research Center, University of Alaska Fairbanks, 930 Koyukuk Drive , Fairbanks, AK, 99775, USA, Phone 907-474-2686, igor [at] iarc [dot] uaf [dot] edu
3Arctic and Antarctic Research Institute, Bering Street, 38, St. Petersburg, 199397, Russia, Phone +7-812-352-3352, vladimir [dot] ivanov [at] aari [dot] ru

It is believed that circulation of the intermediate (150-800m) water of Atlantic origin (the so-called Atlantic Water, AW) in the eastern Arctic Ocean is topography-steered confining with deep-basin margins and enveloping the shelf breaks. However, recent observations from Fram Strait show barotropic structure of water transport. Mooring records from Svalbard area (~30E) show very different structure of flow with a maximum velocity at ~200m in the AW core. Mooring observations over the Laptev slope showed erosion of the AW jet-like flow and further eastward observations at the Lomonosov Ridge found a barotropic flow with velocity generally decreasing with depth. Modeling results suggest the existence of topographically-controlled two-core along-slope flow near the Spitsbergen slope. The shallow core is located over the shelf break at ~400m. The second core is shifted in the basin interior and located at ~1200m. Similar to observations, the vertical structure of deeper branch of AW flow has a maximum at an intermediate depth caused by baroclinic balance of forces. This finding may be important for interpretation of warm AW pulses in the Arctic Ocean interior.

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National Science Foundation | Division of Arctic Sciences
National Science Foundation
National Oceanic and Atmospheric Administration
National Oceanic and Atmospheric Administration
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Department of Energy
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Bureau of Land Management
International Study of Arctic Change
International Study of Arctic Change
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DAMOCLES
Developing Arctic Modeling and Observing Capabilities for Long-term Environmental Studies

This work is supported by the National Science Foundation (NSF) under the ARCUS Cooperative Agreement ARC-0618885. Any opinions, findings, and conclusions or recommendations expressed do not necessarily reflect the views of the NSF.