蒋国荣,何金海,王东晓,张韧,阎俊岳,姚华栋. 2004. 南海夏季风爆发前后海-气界面热交换特征[J]. 气象学报, 62(2):189-199, doi:10.11676/qxxb2004.020
南海夏季风爆发前后海-气界面热交换特征
AIR-SEA HEAT FLUX EXCHANGE FEATURE OVER THE SOUTH CHINA SEA BEFORE AND AFTER THE SCS SUMMER MONSOON ONSET
投稿时间:2003-10-11  修订日期:2004-01-30
DOI:10.11676/qxxb2004.020
中文关键词:  南海  南海夏季风  海气通量  海面热收支  SST
英文关键词:The SCS summer monsoon  SCS  Ai-rsea heat fluxes  Sea-surface heat budget  SST
基金项目:NSFC重点基金40136010项目;国家自然科学基金(90211011以及40075003)
作者单位
蒋国荣 南京气象学院大气科学系, 南京, 210044
解放军理工大学气象学院二系, 南京, 211101 
何金海 南京气象学院大气科学系, 南京, 210044
中国科学院热带海洋环境动力学实验室, 广州, 510301 
王东晓 中国科学院热带海洋环境动力学实验室, 广州, 510301 
张韧 解放军理工大学气象学院二系, 南京, 211101 
阎俊岳 南京气象学院大气科学系, 南京, 210044 
姚华栋 南京气象学院大气科学系, 南京, 210044 
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中文摘要:
      文中利用2000与2002年二次南海海-气通量观测资料和同期西沙站资料,研究了南海夏季风爆发前后海洋表面热收支变化特征。研究表明:南海夏季风爆发前后,影响海面热收支变化的主要分量是净短波辐射通量和潜热通量,在季风爆发前后不同阶段,二个分量的变化有不同表现形式,但不论二者如何变化,季风爆发与活跃期,海面热收入减小或为净支出;季风爆发前及中断期间,海面热收入逐渐增加;由于大的热惯性,海温变化落后于海面热收支的变化,海温的这种滞后效应通过影响潜热通量调节海面热收支的变化,又反过来影响自身的变化,形成短期振荡过程,这种振荡过程与季风的活跃、中断过程相对应。
英文摘要:
      This paper is devoted to the features of sea-surface heat exchange in the different phases before and after the summer monsoon onset in the South-China Sea (SCS) by analysis of the observed air-sea heat fluxes of year 2000 and 2002 and dat a from Xisha Island Weather Station in the same period. Results suggest that the primary factors af fecting sea-surface thermal budget are the latent heat flux and the net short wave radiation because the sensible heat fluxs and net long wave radiation have low magnitude or a smaller change range, but the net solar short wave radiation and the latent heat flux have high value and bigger change range which the daily mean value could differ almost fivefold. The comparison analysis finds that there is better relation between the low cloud amount and the net short wave radiation. The sharp reduction of the net short wave radiation is usually in association with precipitation. Among the different phases before and after the summer monsoon onset in the South-China Sea (SCS), the variations of the net solar shortw ave radiation and the latent heat flux have different ways. In the phase before the summer monsoon onset or break phase, the variation range of the latent heat flux is smaller but the net short wave radiation maintains high value. In the onset or active phase, there is complex change among them. In year 2000, during the first emergence of southwest monsoon, the net loss happened due to the dramatic diminution of the net shortwave radiation resulting from increased cloud system and intense precipitation, which was a situation of local convection that the ocean release energy to atmosphere in the form of precipitation; In the second span of the gales, there was lit tle change in the net solar short wave radiation because of less precipitation cloud system, but the dramatic growth of latent heat flux resulting from int ense evaporation could be responsible for vapor transport faraway from the source by means of large-scale strong SW winds. Regardless of t heir changing ways, the thermal gain was reduced or became net loss at the active stage or the onset stage and the thermal gain gradually increased before the onset stage or in the lull periods; That means the monsoon burst or active process is the process that ocean release the energy and the monsoon break process or the period before the onset is the process that ocean gain the energy. It is also found that the variation of SST is not synchronous with that of sea-surface thermal budget. Owing to great thermal inertia of water, SST change lags behind that of heat budget over the sea surface, and the lagging is responsible for regulating the budget by affecting latent heat f luxes, which, in turn, effected upon the change of the SST, thereby forming short-term oscillations that are in association with the active/break phases of the monsoons. Part of the conclusions have been borne out by the observational study based on 1998.
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