长山群岛海区春季水温垂直结构分析

Analyses of the Water Temperature Structure in the Changshan Archipelago in Spring

利用海军大连舰艇学院2006年4月长山群岛海区的CTD调查资料,系统分析了该季节长山群岛海区的温度垂直结构,并探讨了其形成机理。分析指出:4月上、中旬是长山群岛海区季节性温跃层的生成期,群岛东侧和南侧边缘受黄海冷水团形成过程的影响,温跃层的出现概率和跃层强度都远远高于群岛内部;在生成时机上,群岛东侧和南侧边缘海域早于群岛内部水域。中间层和底层海水温度的垂直结构与海流有着很好的相关性,在海洋平流的作用下,海区会产生正跃层、逆跃层、冷中间层、暖中间层等复杂的温度垂直结构。上层海水温度结构主要受海面风场和气温的影响,较强的热辐射和充分的风力搅拌能够加速温跃层的生成。

Using the CTD data obtained by Dalian Naval Academy in the Changshan Archipelago in April 2006, the vertical structure of water temperature is analyzed systematically and the form mechanism of the vertical structure is discussed. By analysis it is pointed out that the seasonal thermocline in Changshan Archipelago is formed during the first ten days and the middle ten days in April. Both occurring probability and intensity of the thermocline on the eastern and southern edge of the Archipelago are much higher than that in interval water, and the time when the thermocline forms stably on the edge of Archipelago is earlier than that in internal water because the influence of the formation of the Huanghai Sea Cold Water Mass. The vertical structure of water temperature on the middle and bottom layers is relevant tightly to the ocean current, and the complicated temperature vertical structures, such as positive thermocline, negative thermocline, warm middle layer or cold middle layer will appear if there is appropriate horizontal current. Temperature structure in the upper ocean is mainly controlled by the wind and atmosphere temperature over the ocean surface, and intense heat radiation and adequate wind force could accelerate the formation of thermocline.