Journal of Tropical Oceanography >
Numerical simulation of seasonal cycle in the warm pool and its sensitivity to surface heat flux and momentum forcing
Received date: 2009-07-27
Revised date: 2009-10-12
Online published: 2011-03-16
Supported by
中国科学院知识创新重要方向项目(KZCX2-YW-214); 国家自然科学基金项目(40975065, 40821092); 科技部“973”计划项目
(2006CB400506)
Both heat and momentum fluxes from three sets of data sources are compared in this study, and are used as the up-per boundary condition of a global oceanic general circulation model (OGCM) with which sensitivity experiments to these fluxes are conducted. Through comparison among numerical sensitivity experiments, the authors evaluate the model’s ability in simulating seasonal cycle of the equatorial Indian and Pacific Ocean warm pool, and explore its sensitivity to surface heat and momentum forcing. Firstly, numerical simulations show that the ocean model can reproduce realistic seasonal cycle of the extension and magnitude of the warm pool in the equatorial western Pacific and Indian oceans and the difference in the sea-sonal cycle between these two ocean basins. Increased vertical resolution in the upper model ocean can improve effectively the simulated seasonal cycle of surface mixed layer depth. Secondly, the simulated seasonal cycle of the warm pool basically de-pends on both seasonal cycle of heat fluxes and mixed layer depth, but the simulations can hardly reflect the impact from the vertical entrainment and turbulent mixing, which is probably resulted from coarse temporal resolution in the external forcing fields; as a result, some important synoptic processes are not included in turbulent mixing, thus it is necessary to increase the temporal resolution of the external forcing in future. Finally, inter-comparison among the numerical experiments forced with different heat and momentum fluxes shows that the equatorial Indian Ocean warm pool is sensitive to differences in both the heat and mo-mentum fluxes, but the equatorial western Pacific Ocean warm pool is only sensitive to the differences in the heat fluxes.
Key words: warm pool; OGCM; heat flux; wind stress; surface mixed layer depth
YU Yong-qiang,LI Chao,WANG Dong-xiao,LIU Hai-long . Numerical simulation of seasonal cycle in the warm pool and its sensitivity to surface heat flux and momentum forcing[J]. Journal of Tropical Oceanography, 2011 , 30(1) : 1 -10 . DOI: 10.11978/j.issn.1009-5470.2011.01.001
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