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利用 1 998年 5～ 8月“南海季风试验”期间“科学 1”号和“实验 3”号科学考察船两个航次CTD资料 ,分析了 1 998年南海夏季风暴发前后南海主要断面的温盐结构及其变化特征 .观测发现 ,南海腹地基本被典型的南海水团所控制 ,但在南海东北部尤其是吕宋海峡附近 ,表层和次表层水明显受到西太平洋水的影响 .季风暴发以后 ,南海北部表面温度有显著升高 ,升幅由西向东递减 ,而南海中部和南部表面温度基本没变 ,这使得南海北部东西向温度梯度和整个海盆南北向温度梯度均减小 .北部断面表层盐度普遍由 34以上降低到 34以下 ,混合层均有所发展 ,是季风暴发后降水和风力加剧的结果 .观测期间黑潮水跨越吕宋海峡的迹象明显但变化剧烈 .4～ 5月 ,黑潮次表层水除在吕宋海峡中北部出现外 ,在吕宋岛以西亦有发现 ,表明有部分黑潮水从吕宋海峡南端沿岸向西进而向南进入南海 .6～ 7月 ,次表层高盐核在吕宋海峡中北部有极大发展 ,但在吕宋岛以西却明显萎缩 ;虽然看上去黑潮水以更强的流速进、出南海 ,但对南海腹地动力热力结构的影响未必更大 .一个超过 34.55的表层高盐水体于巴拉望附近被发现 ,似与通过巴拉望两侧水道入侵南海的西太平洋水有关 .
Using the CTD data of two voyages of “Science 1” and “Science 3” during the “South China Sea Monsoon Experiment” from May to August 1998, the CTD data of two voyages of the South China Sea before and after the summer monsoon onset in 1998 were analyzed. Structure and its variation characteristics of the South China Sea.The observation shows that the hinterland of the South China Sea is basically controlled by the typical South China Sea mass, but the surface and subsurface water in the northeastern South China Sea, especially the Luzon Strait, are obviously affected by the western Pacific water.After the monsoon onset, The surface temperature in the northern South China Sea increased significantly from west to east, while the surface temperature in the central and southern South China Sea did not change substantially, which caused the decrease of the east-west temperature gradient and the north-south temperature gradient in the northern South China Sea. Generally from 34 to below 34, the mixed layer has developed, the monsoon after the outbreak of precipitation and wind intensified the results of the Kuroshio observed across the Luzon Strait during the observation period obvious but dramatic changes in April to May, Kuroshio times In addition to surface water in the north of the Luzon Strait appear, also found in the west of Luzon Island, indicating that some of the Kuroshio water from the southern end of the Luzon Strait westward South into the South China Sea .6 ~ July, sub-surface salt lake in the Luzon Strait in the north have a great development, but significantly shrank west of Luzon; although it seems that the Kuroshio into a stronger flow rate, out of the South China Sea , But it may not be more influential on the dynamic thermal structure in the hinterland of the South China Sea. A super-saline surface water body above 34.55 was found near Palawan and seems to be associated with the invasion of the western Pacific water in the South China Sea through the waterways on both sides of Palawan.