数据同化反演风应力拖曳系数以及垂向涡动黏性系数的分布
Deducing the wind stress drag coefficient and the oceanic eddy viscosity profile by data assimilation
-
摘要: 所作的孪生实验表明:通过利用变分优化控制技术将气象学和海洋学(表层和次表层)的观测资料同化到海洋的埃克曼层模型中,可将未知的边界条件(风应力拖曳系数)和垂向涡动黏性系数的分布同时反演出来.Abstract: A variational optimal control technique is used to assimilate both meteorological and oceanographic(sea surface current and subsurface current) observations into an oceanic Ekman layer model.An identical twin experiment is discussed.By fitting the model results to the data,the unknown boundary condition(the wind stress drag coefficient) and the unknown vertical eddy viscosity distribution are deduced simultaneously from the data.
-
Key words:
- data assimilation /
- variational analysis /
- adjoint method
-
SMEDSTAD O M,O' BRIEN J J.Variational data assimilation and parameter estimation in an equatorial Pacific Ocean model[J].Progress in Oceanography,1991,26:171~241. NAVON I M.Practical and theoretical aspects of adjoint parameter estimation and identifiability in meteorology and oceanography[J].Dynamics of Atmospheres and Oceans,1997,27:55~79. LE DIMET F X,TALAGRAND O.Variational algorithms for analysis and assimilation of meteorological observations:theoretical aspects[J].Tellus,1986,38A:97~110. LARDNET R W.AL-RABEH A H,GUNAY N.Optimal estimation of parameters for a two-dimensional hydro-dynamical model of the Arabian Gulf[J].Journal of Geophysical Research,1993,98:18 229~18 242. YU L,O' BRIEN J J.Variational estimation of the wind stress drag coefficient and the oceanic eddy viscosity profile [J].Journal of Physical Oceanography,1991,21:709~719. LARDNER R W.Optimal control of an open boundary conditions for a numerical tidal model[J].Computer Methods in Applied Mechanics and Engineering,1993,102:367~387. SELLER U.Estimation of open boundary conditions with the adjoint method[J].Journal of Geophysical Research,1993,98:22 855~22 870. YU L,O' BRIEN J J.On the initial condition parameter estimation[J].Journal of Physical Oceanography,1992,22:1 361~1 364. BERGAMASCO A,MALANOTTE-RIZZOLI P,THACKER W C,et al.The seasonal steady circulation of the Eastern Mediterranean determined with the adjoint method[J].Deep-Sea Research(Ⅱ),1993,40:1 269~1 298. FUKUMORI I,BENVENISTE J,WUNSCH C,et al.Assimilation of sea surface topography into an ocean circulation model using a steady state smoother[J].Journal of Physical Oceanography,1993,23:1 831~1 855. HOLLAND W R,MALANOTTE-RIZZOLI P.Assimilation of altimeter data into an ocean circulation model:space versus time resolution studies[J].Journal of Physical Oceanography,1989,19:1 507~1 534. MAROTZEK J,WUNSCH C.Finding the steady state of a general circulation model through data assimilation:application to the North Atlantic Ocean[J].Journal of Geophysical Research,1993,98:20 149~20 167. SCHLITZER R.Determining the mean large scale circulation of the Atlantic with adjoint method[J].Journal of Physical Ocesnography,1993,23:1 935~1 952. TZIPERMAN E,THACKER W C,LONG R B,et al.Oceanic data analysis using a general circulation model.Part Ⅰ:Simulations[J].Journal of Physical Oceanography,1992,22:1 434~1 457. TZIPERMAN E,THACKER W C,LONG R B,et al.Oceanic data analysis using a general circuation model.Part Ⅱ:A North Atlantic model[J].Journal of Physical Oceanography,1992,22:1 458~1 485. ROQUET H,PLANTON S.Determination of ocean heat fluxes by a variational method[J].Journal of Geophysical Research,1993,98:10 211~10 221. YU L,O' BRIEN J J.Variational data assimilation for determining the seasonal net surface heat fluxes using a tropical Pacific Ocean model[J].Journal of Physical Oceanography,1995,25:2 319~2 343. SASAKI Y.Some basic formations in numerical variational analysis[J].Monthly Weather Review,1970,98:875~883 BERTSEKAS D P.Constrained Optimization and Lagrange Multiplier Methods[M].London:Academic Press,1982.395. THACKER W C,LONG R B.Fitting dynamics to data[J].Journal of Geophysical Research,1988,93:1 227~1 240.
点击查看大图
计量
- 文章访问数: 724
- HTML全文浏览量: 4
- PDF下载量: 872
- 被引次数: 0