南海上层环流对不同气候态风场响应的数值研究*

doi:10.11978/j.issn.1009-5470.2015.04.001

Abstract

Abstract:

Four kinds of climatological monthly wind stresses, including SCOW (Scatterometer Climatology of Ocean Winds), CFSR (NCEP Climate Forecast System Reanalysis), ERA-Interim (the Interim ECMWF Re-Analysis), and NCEP [the National Centers for Environmental Prediction (NCEP)/National Center for Atmospheric Research (NCAR) Reanalysis 1] were used to force the South China Sea (SCS) circulation using the Regional Ocean Modeling System (ROMS). The differences among the simulated upper circulation in the SCS from the four experiments and their dynamical relationships with the differences of these wind stresses were explored. Significant differences exist in wind stress and its curl in terms of patterns, and these differences are reflected in the upper-ocean model responses. The results show that seasonal variation of the basin-scale circulation in the SCS can be well represented in all the experiments. The major differences are in sub-basin or mesoscale circulations. It is the significant local positive wind stress curl that leads to the generation of the Luzon cold eddy in winter. The dipole structure of the upper circulation off the Vietnam coast can be clearly seen in all four experiments in summer; but the strength of the dipole varies with the forcing and is related to the local wind stress curl dipole. Moreover, it is shown that the Luzon Strait transports are consistent in the experiments, which indicates that there is little impact from the differences of local wind stresses on the Luzon Strait transport. But the simulated Taiwan Strait transports differ great in both autumn and winter. Strong northeasterly wind impedes the water transport from south to north. Further analysis shows that large northward seawater transport through the Taiwan Strait in winter is in favor of the existence of the SCS warm current (SCSWC) in the northern SCS in the model results. Overall, this study helps us to more deeply understand the responses of upper-ocean circulation in the SCS to atmospheric wind forcing. At the same time, it provides some references to the choice of wind field in simulating the SCS circulation.

Key words: SCS circulation, numerical simulation, wind stress curl, SCS warm current, Luzon, Vietnam coast

YAN Tong, QI Yi-quan, JING Zhi-you. A numerical study on the responses of the South China Sea upper circulation to different climatological wind products[J].Journal of Tropical Oceanography, 2015, 34(4): 1-11.

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A numerical study on the responses of the South China Sea upper circulation to different climatological wind products

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