HR: 1340h
AN: OS43B-1238    [Abstracts]
TI: Variational Reconstruction of the Chukchi Sea Circulation in October-November 1990
AU: * Nechaev, D
EM: Dmitri.Nechaev@usm.edu
AF: University of Southern Mississippi, Department of marine Science, 1020 Balch Blvd., Stennis Space Center, MS 39529, United States
AU: Panteleev, G
EM: gleb@iarc.uaf.edu
AF: International Arctic Research Center-Frontier Research System for Global Change, University of Alaska Fairbanks, 930 Kouykuk Drive, Fairbanks, AK 99775, United States
AU: Woodgate, R
EM: woodgate@apl.washington.edu
AF: Applied Physics Laboratory University of Washington, 1013 NE 40th Street, Seattle, WA 98105, United States
AB: We present the results of variational hindcast of the circulation in the Chukchi Sea in October-November 1990. The optimal solution of the primitive equation model of the Chukchi Sea is obtained by 4dvar assimilation of the data of several hydrophysical surveys in the region combined with the CTD and current meter records from 11 moorings. NCEP/NCAR atmospheric data and hydrographic climatologies were used as background data to ensure the well-posedness of the data assimilation problem. The model solution is controlled by initial conditions, fluxes through the open boundaries, and surface fluxes. The first guess model solution is obtained by 3dvar optimization of the initial conditions and boundary fluxes in the quasi-stationary version of the model. The obtained optimal solution is consistent with the observations and data error statistics. The observations constrain well the model solution in the Bering Strait region, while the model dynamics allows us to reconstruct the path of the Bering Strait water in the Chukchi Sea. The data assimilation results provide robust quantitative estimates of the fresh water transports in the Chukchi Sea and improve the prior estimates of the ice-ocean fluxes in the region. The circulation pattern reveals periodical reverse of the East Siberian Current and the Bering Strait throughflow.
DE: 4255 Numerical modeling (0545, 0560)
DE: 4512 Currents
DE: 4532 General circulation (1218, 1222)
SC: Ocean Sciences [OS]
MN: 2007 Fall Meeting