利用 2000 年和 2002 年《南海海气通量观测》外场试验获得的辐射资料及同期西沙气象站常规观测资料,分析了南海夏季风爆发前及爆发后各个阶段辐射平衡分量的变化特征。研究结果表明,南海夏季风爆发前、后辐射平衡各分量均出现突变现象。爆发前太阳总辐射与净长波辐射日平均强度最大,爆发期最小,中断期次之,活跃期又次之;而正午前后海面反照率趋势相反,爆发前最小,爆发期最大,中断期接近爆发前的值,活跃期则与爆发期接近。进一步对比分析表明,南海夏季风爆发前、后辐射平衡分量的变化是由于南海夏季风爆发对应的大尺度环流调整产生的不同天气过程造成的。爆发前,天气晴朗少云,无降水,海洋得到的净辐射收入最多;相反,爆发期,降水云系增多,导致太阳总辐射急剧减少,海洋得到的净辐射收入最少;中断期,天气有转好趋势,但晴好状况弱于爆发前,故净辐射收入也略低于爆发前;活跃期虽为西南风过程,但局地降水减少,因而净辐射收入减少程度弱于爆发期。 Based on the radiation data obtained from the “South China Sea Sea Gas Flux Observation” field experiment in 2000 and 2002 and the conventional observation data of Xisha stations in the same period, the variation characteristics of the radiation balance components before and after the onset of the South China Sea summer monsoon are analyzed. The results show that all the components of the radiation balance change suddenly before and after the onset of the South China Sea summer monsoon. Before the outbreak, the total solar radiation and the net longwave radiation had the highest average daily intensity, the smallest outbreak, the second outbreak followed by the active period, while the sea surface albedo tended to be opposite before noon, with the smallest pre-eruption period and the largest eruption period, The former value, the active period is close to the outbreak period. Further comparative analysis shows that the changes of the radiation balance components before and after the onset of the South China Sea summer monsoon are caused by the different weather processes resulting from the large-scale circulation adjustment corresponding to the onset of the South China Sea summer monsoon. Before the outbreak, the weather was clear with few clouds and no precipitation, and the ocean received the most net radiation income. On the contrary, during the period of the outbreak, the precipitation increased and the total solar radiation dropped sharply, and the ocean received the least net radiation income. During the interruption period, However, although the condition of fine weather is weaker than that before the outbreak, the net radiation income is also slightly lower than that before the outbreak. Although the active period is the southwesterly process, the precipitation in the local area is reduced and the net radiation income is reduced less than the period of the outbreak.