中文摘要：

利用南黄海西部2007-04的温盐实测资料,采用海洋层结谱表达法及自适应识别,得到逆温跃层的＂五点三要素＂,形成强度要素平面分布图。分析表明,逆温跃层的存在与黄海暖流水有直接的关系：1）4月份,黄海暖流水受到的海面冷却仍是产生逆温跃层的普遍原因,在该海区黄海暖流向北延伸和向两侧拓展的区域都有该种类型的逆温跃层存在,位置相对较浅;2）但在偏南的黄海暖流主干区,海面冷却产生的效应被主流区的热量补充所抵消,逆温跃层很弱甚至消失,这是该月份逆温跃层分布区向北退缩并在南部中心附近呈现缺失区的主要原因;3）南下的鲁北沿岸流水的冷水叠加在黄海暖流水的暖水上方,使逆温跃层加强,使得冷暖水的作用区成为强逆温跃层区;4）黄海暖流左侧冷沿岸流水及右侧冷水的前端向黄海暖流楔入,其前端往往覆盖在底层高温高盐的黄海暖流水上方形成下逆温跃层,从而形成双逆温跃层。这些特点,较以前认知更加客观、全面、细致和准确。

英文摘要：

The ＇five points and three elements＇ of inversion thermocline are obtained and the horizontal distribution of strength factors is plotted by using the temperature and salinity data measured in the western South Yellow Sea in April,2007 and by means of the marine stratification spectrum representation and the adaptive recognition.The analysis indicates that the occurrence of the inversion thermocline in the werstern South Yellow Sea is directly related to the water of the Yellow Sea Warm Current： 1） The surface cooling that the water of the Yellow Sea Warm Current was subjected to in April is still the universal reason that causes the formation of the inversion thermocline.In the study area,such kind of inversion thermocline occurs in the areas where the Yellow Sea Warm Current extends to the north and expands both sides and the position of the thermocline is shallow;2） In the main area of the Yellow Sea Warm Current further to the south,however,the effect caused by the sea surface cooling is offset by the heat supplement and the inversion thermocline becomes very weak and even disappears.This is the reason why the area of the inversion thermocline retreats northward and becomes absent near the southern central region in the month of April;3） The overlying of the southward cold water of the Lubei Coastal Current over the warm water of the Yellow Sea Warm Current makes the inversion thermocline strengthen,thus making the area of cold and warm water action become a strong inversion thermocline area;4） The front ends of both the cold coastal current water and the cold water located respectively at the left side and the right side of the Yellow Sea Warm Current wedge to the Yellow Sea Warm Current and often overlay above the high temperature and high salt water of the Yellow Sea Warm Current,forming a lower inversion thermocline.Thereby,a kind of double inversion thermocline forms.All these characteristics are more objective,comprehensive,detailed and accurate than what we have known before.