Program and Agenda

Abstract

OCEANIC RESPONSE TO RECENT CHANGES IN ATMOSPHERIC AND SEA ICE FORCING IN THE BERING SEA SHELF

The Bering Ecosystem STudy ice–ocean Modeling and Assimilation System (BESTMAS), combined with observational and reanalysis data, is used to examine the oceanic response to changes in the atmospheric and sea ice forcing in the Bering Sea shelf over the period 2003–2013. BESTMAS, calibrated by available observations, is able to capture the spatiotemporal variability of the trawl survey surface and bottom water temperature data over the past three decades. It is also able to realistically simulate the observed interannual and seasonal variations of water temperatures at the M2 mooring site. The Bering Sea has seen a shift from a warm (light ice) period to a relatively cold (heavy ice) period in recent years. In the model, the ocean responds to such a shift with significant changes in the simulated water temperature, salinity, and circulation. The changes in the ocean, as well as in the sea ice cover, affect light availability and nutrient distribution on the shelf and therefore causes significant warm year/cold year differences in phytoplankton and zooplankton productivity. Furthermore, the BESTMAS field of bottom layer temperature on the Bering Sea shelf on May 31 is found to be a good predictor of the distribution and extent of cold bottom waters through late spring and summer, which may be useful information for fishery planning and management.

Authors

Zhang, J., University of Washington, USA, zhang@apl.washington.edu

Banas, N., University of Washington, USA

Campbell, R., University of Rhode Island, USA

Panteleev, G., University of Alaska Fairbanks, USA

Woodgate, R., University of Washington

Details

Oral presentation

Session #:088
Date: 2/24/2014
Time: 14:00
Location: 316 B

Presentation is given by student: No