连云港、吕泗海域的海表温度变化及影响机制

The Variation of Sea Surface Temperature with Its Influencing Mechanism of Lianyungang and Lüsi Waters

通过对连云港海域(1976-2008)、吕泗海域(1960-1990)30年左右的海表温度(SST)资料进行随机动态分析;并计算了SST与Nio3.4指数、海表热通量和海面风场的相关系数。研究结果表明:从1976-2008年连云港的SST呈现长期升高的趋势,32年间约上升0.9℃;从1960-1990年吕泗的SST呈现下降的趋势,30年间共下降约0.22℃。月均的SST最大熵谱分析揭示了两站的SST具有12个月和6个月的显著变化周期,此外还有准2 a的振荡周期。东赤道太平洋海温的异常对连云港、吕泗海域的SST有一定的影响,热通量是影响连云港海域SST变化的部分因素,仅通过海面热通量的变化无法解释连云港海域海表温度升高的现象,海洋动力过程对SST的贡献不能忽略。连云港、吕泗海域的SST变化与风场的变化显著相关。

The sea surface temperature （SST） and Nifio3.4 index, with the correlation coefficient of sea surface heat flux （SHF） and wind field were calculated through the stochastic dynamic analysis of the 30 years＇ SST data, which came from the Lianyungang waters （1976--2008） and Ltisi waters （1960--1990）. The research results show a long-term trend of raise for the SST in Lianyungang during 1976--2008, which had raised by 0.9 ℃ in the 32 years; while they show a decline in Liisi waters, which had declined by 0. 22℃. The maximum entropy spectrum analysis of the average monthly SST reveals that the two sites＇ SST had significant change cycles of 12 and 6 months, in addition with an oscillation period of 2 years. Temperature anomaly on eastern equatorial Pacific had a certain effect on SST of Lianyungang and Ltisi waters, SHF was part of the factors which had affected the SST of Li- anyungang waters, the raise of SST could not be explain only by means of SHF. The contribution of the marine dy- namic process to SST in Lianyungang waters could not be ignored. The SST variation in Lianyungang and Lusi wa- ters had a significantly corelation with the wind field.