南海地区总云量的气候特征研究

采用EOF展开、小波分析、Mann-Kendall突变分析等方法,利用国际卫星云气候计划(ISCCP)提供的月平均云气候资料集,分析了南海地区总云量的气候特征.结果表明:①总云量表现为南北型的空间分布特征,分界在16°N附近,以北区域主要受南北热力差异影响,以纬向分布为主；以南区域主要受海陆热力差异影响,沿海岸线分布....

Climatological Features of Total Cloud Amount over South China Sea

Using the International Satellite Cloud Climatology Project（ISCCP） monthly climate dataset,the climatological features of the total cloud amount over the South China Sea（SCS） are studied by applying the methods of EOF,wavelet,Mann-Kendall mutation analysis,etc.The results show that：（1） The spatial characteristic field of the total cloud amount over SCS is the north-to-south type.The partition line is near 16°N.The distribution in the north part is along latitudes,most obviously affected by the diversity of thermodynamics,and the distribution in the south part is along the coastline,most obviously affected by the diversity between ocean and lands.（2） There is the remarkable seasonal feature in the distribution of total cloud amount.It is the north-south type in winner and spring,but the west-east type in summer and autumn.The seasonal transition occurs at April and October.（3） The abnormal total cloud amounts correspond to the climate abnormal years.In the year of abnormally increased total cloud amount,there often occur drought disasters in South China,while in the abnormally reducing year,there occur flood disasters.（4） There exists strong periodic oscillation in total cloud amount with the period being five years and weak period oscillation with the period being two years.（5） The abrupt change of the total cloud amount happened in 2006,and afterwards the total cloud amount has been increasing.