基于QuikSCAT/NCEP风场的1999-2009年中国海表风场研究

摘要

利用1999年8月-2009年7月具有高精度的QuikSCAT/NCEP混合风场,对中国海海表风场的风速风向、极值风速、大风频率等特征进行分析,研究发现:MAM和SON的风速大值中心位于台湾海峡,JJA位于南海西南部海域,DJF大值区主要位于琉球群岛-台湾海峡-东沙群岛-平顺海岛一带,风向也具有明显的季节特征；极值风速的大值中心都主要集中在台湾以东洋面、琉球群岛附近海域、海南岛以东和东沙群岛附近海域；大部分海域3-25 m/s风速出现的频率都比较高,6级以上大风出现频率较高的海域集中在对马海峡、琉球群岛附近海域、台湾岛附近海域；对逐月风场进行EOF分析的结果与季节特征分析的结果吻合较好,中国海近10年海表风场的线性变化趋势不显著.%In this paper, the QuikSCAT/NCEP wind field data is used to analyze the characteristics of sea surface wind field in the China Sea from 1999 to 2009. The primary characteristics of wind field were analyzed, such as the sea surface wind speed, wind direction, extreme wind speed and frequency of gale. The wind speed and wind direction show obvious seasonal characteristic. Large values of extreme wind speed occurred in the east area of Taiwan, around Hainan Island and so on. The frequency of wind speed between 3m/s and 25m/s is high. The regions with wind speed larger than 13.9m/s are mainly in the Tsushima strait, Taiwan Island and adjacent area and so on. The result of monthly EOF analysis is similar to the seasonal characteristics of wind field in the China Sea.