中文摘要：

利用1985年1月～2009年7月月平均海表面温度（SST）和代表局地对流的对外长波辐射（OLR）资料,讨论中国南海海表面温度与局地对流之间的关系。结果显示,在气候平均意义下,南海对流增强所需的SST阈值为27℃,即当SST低于27℃时,南海OLR值高于240 W/m2,并且随SST的升高变化不大;SST超过27℃后,随着SST的升高,OLR迅速减小,对流强度不断增强。与一般热带海洋不同之处在于SST超过29.5℃后对流仍加强。冬季风阶段（10月～次年4月）SST值较低,对流受到抑制,即使在3、4月SST高于27℃时对流强度仍较弱;5月为南海夏季风爆发月,SST较4月仅升高1℃,但对流强度显著增强;夏季风阶段（6～9月）南海的高温暖水使对流在平均意义上维持高值,但对流的变化与局地SST变化之间的关系不明显。

英文摘要：

Monthly mean sea surface temperature（SST） and outgoing longwave radiation（OLR） indicating the presence of convection from January 1985 to July 2009 have been used to discuss the relationship between the sea surface temperature and the local convection in the South China Sea（SCS）.The results show that in the climatological sense,27 ℃ is the threshold of SST for convection in SCS to increase： when SST is lower than 27 ℃,OLR is greater than 240 W/m2 and its varicotion is few with increasing SST,when SST27 ℃ OLR substantially decreases,indicating the convection increases with increasing SST.Convection is still strong even that SST is higher than 29.5 ℃,which is different from other tropical ocean.In winter monsoon phase（Oct-Apr next year） SST is low and convection is repressed,and the convection is still weak in March and April although SST is warmer than 27 ℃;May is the month for the onset of SCS summer monsoon,and SST in May is only 1 ℃ higher than April,but convection is significantly stronger;in summer monsoon phase（Jun-Sep） the warm water makes the convection strong in the average sense,but the relationship between convection variation and local SST variation is vague.