南海暖水形态特征

利用Levitus资料 ,分析了南海各月某些标准层上的海温水平分布、南北向温度断面垂直分布 ,阐述了南海暖水水平和断面温度分布的阶段性特征 ,给出了南海暖水中心点 ( 1 1 3°E ,8°N)海温垂直结构特征。使用 3次自然样条函数 ,将格点资料插值到每米的深度上 ,求出各格点 2 8℃海温的深度 ,得出各月 2 8℃等温包络面。结果表明 :4～ 1 1月份 2 8℃等温包络面呈现大小不等和深浅不同的盆状 ,其各月的变化形象化地表示了暖水的演变过程。分析南海暖水中心点各标准层温度的季节变化表明 :30m以上海水温度季节变化基本一致 ,冬季 1月最低 ,春季 5月最高 ,次高出现在 1 0月份 ;50m海水温度最低值延至 3月份 ,最高在 7月份 ,次高也在 1 0月份。 2 8℃等温包络面所包体积的季节变化是一个较为规则的单峰型

SHAPE FEATURES OF WARM WATER IN SOUTH CHINA SEA

Using Levitus data set of the South China Sea, the horizontal distribution, the vertical distribution along the meridional section of monthly mean sea temperature in some standard layers of the South China Sea were analyzed. The stage features of the distributions and the vertical structure of sea temperature at the central region of warm waters were described. Interpolating sea temperature value at every meter by a spline-function method, the depth with sea temperature of 28℃ and the envelope surface depth with constant temperature of 28℃ were obtained. It was found that from April to November, the 28℃ constant temperature envelope surfaces appeared like a pot pattern, with different size and depth, expressing the evolution processes of warm waters. The seasonal variations of temperatures at the center point (113°E,8°N) in the standard layers showed that the seasonal variations of sea temperature above 30m are consistent. The minimum temperature occurred in January, the maximum temperature in May, the second maximum temperature in October. At the depth of 50m, the minimum temperature lasted till March; the maximum temperature occurred in July and the second maximum temperature in October. The seasonal variation of the volume packed by 28℃ constant temperature envelope surface showed a regular single peak pattern.