暖池季节变化的数值模拟及其对海表热力和动力强迫的敏感性
收稿日期: 2009-07-27
修回日期: 2009-10-12
网络出版日期: 2011-03-16
基金资助
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)
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)
对比3套不同来源的海表热通量和风应力资料在热带太平洋和印度洋区域的差异, 然后把这些海表强迫场作为一个全球海洋环流模式(LICOM)的上边界条件, 进行动力和热力强迫的敏感性试验。通过对比分析试验结果, 评估了LICOM对印度洋和西太平洋暖池季节变化的模拟能力, 探讨了印度洋和西太平洋暖池对动力和热力强迫的敏感性。首先, 模式结果表明LICOM能较真实地模拟出印度洋和西太平洋暖池面积和强度的季节变化特征以及两海区暖池季节变化的差异, 而且上层海洋垂向分层的加密能有效改善混合层深度季节变化的模拟。其次, 模式中暖池的季节变化基本由海表净热通量和混合层深度的季节变化共同决定, 但是试验结果中难以反映垂向挾卷和湍流混合对暖池区混合层深度的影响, 可能原因是气候态月平均强迫场时间分辨率较粗, 不能真实反映一些重要的天气尺度过程对混合层动力过程的影响, 故有必要增加强迫场时间分辨率做进一步研究。最后,不同强迫场的敏感性试验对比分析结果表明, 印度洋暖池对海表动力和热力强迫场的差异均较为敏感, 而西太平洋暖池则只对海表热量强迫场的差异较为敏感, 对动力强迫场的差异不敏感。
俞永强,李超,王东晓,刘海龙 . 暖池季节变化的数值模拟及其对海表热力和动力强迫的敏感性[J]. 热带海洋学报, 2011 , 30(1) : 1 -10 . DOI: 10.11978/j.issn.1009-5470.2011.01.001
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
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