南海温跃层深度的季节和年际变化特征  

SEASENAL AND INTERANNUAL VARIATIONS OF THE THERMOCLINE DEPTH IN THE SOUTH CHINA SEA

作　　者：方雪娇[1] 王彩霞[1] 徐佳佳[1] 

机构地区：[1]中国海洋大学海洋学系,山东青岛266100

出　　处：《海洋湖沼通报》2013年第3期45-55,共11页Transactions of Oceanology and Limnology

基　　金：海洋公益性行业科研项目(201105002-11)资助

摘　　要：本文利用SODA数据、NCEP数据,初步分析了南海温跃层深度的季节变化特征以及El Nio事件期间的分布特征,剖析了El Nio事件中引起南海温跃层深度异常的主要原因。资料分析表明:南海温跃层深度存在显著的季节和年际变化规律。冬季温跃层深度比夏季深,春、秋季节处于过渡状态。在季风引起的Ekman输运作用下,冬季温跃层东南较浅,西北较深;夏季东南较深,西北较浅。秋季温跃层深度比春季深。在El Nio期间,从10月[0]到3月[+1]南海大部分海区温跃层深度呈现负异常,这与Nino3指数高值的时间范围基本一致。此后,在4月[+1]到6月[+1],温跃层深度转为正异常。El Nio期间影响南海温跃层深度的主要因素有:海表面净热通量,风应力搅拌作用,风应力旋度,Ekman输运。其中风应力搅拌作用以及净热通量的影响占主导地位。Based on SODA （ Simple Ocean Data Assimilation） and NCEP data, the seasonal and interan- nual variation of the thermocline depth in the South China Sea was analyzed and the main reason for the thermocline depth anomalies during the El Ni o event was discussed in this article. According to the a- nalysis, the seasonal and interannual variation rule of the thermocline depth is obvious in the South Chi- na Sea. Thermocline depth is deeper in winter than that in summer, and it is in a transtion state in spring and autumn. Affected by Ekman transport caused by the monsoon, the thermocline is shallower in the southeastern South China Sea than that in the northwestern South China Sea in winter while the thermocline is deeper in the southeastern South China Sea than that in the northwestern South China Sea in summer. The thermocline depth is deeper in fall than in spring. During the E1 Ni o event, the thermocline depth in most of the South China Sea shows negative anomalies from October [0] to March [＋1], which is consistent with the time range of the high value of Nino3 index. The thermocline depth in most of the South China Sea shows positive anomalies from April [＋1] to June [＋1]. The main fac- tors to affect the thermocline depth in the South China Sea are net heat flux, stir of wind stress, wind stress curl and Ekman transport. Stir of wind stress and the net heat flux is dominant in the South Chi- na Sea during the E1 Ni o event.

关 键 词：南海 温跃层 年际变化 EL Nifio 

分 类 号：P731[天文地球—海洋科学]