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The Arctic Ocean: Physical Processes and their Effects on Climate and the Ecosystem
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Circulation and water properties of the northeastern Chukchi Sea in summer
Wednesday 9th @ 1010-1030, Conference Room 5
Peigen Lin* , Woods Hole Oceanographic Institution
Robert S. Pickart, Woods Hole Oceanographic Institution
Presenter Email: plin@whoi.edu |
| Shipboard measurements spanning a 37-year period are used to characterize the general hydrographic structure and circulation patterns in the northeastern Chukchi Sea during summer, including the effects on the distribution of nutrients. The data come from eight synoptic surveys of the region from 2003-2017, which include velocity measurements, and from the Pacific Marine Arctic Regional Synthesis (PacMARS) historical data base from 1981-2013. We track the spreading of both Pacific summer waters and Pacific winter water as they progress northward from Bering Strait into Barrow Canyon over the summer months. Using the vessel-mounted acoustic Doppler current profiler data, a background circulation pattern is deduced in the absence of wind-forcing. This is contrasted to conditions when there are strong northeasterly winds, which fundamentally alters the background flow. Nitrate concentrations are generally higher on the southeastern side of Hanna Shoal due to the character of the Pacific winter water there. This helps explain the enhanced biological activity observed in this region.
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