ASCAT散射计风场在我国近海的初步检验与应用  

Preliminary Validation and Application of ASCAT Scatterometer Retrieved Winds over China Offshore Seas

作　　者：张增海 曹越男 刘涛 赵伟 

机构地区：[1]国家气象中心,北京100081

出　　处：《气象》2014年第4期473-481,共9页Meteorological Monthly

基　　金：国家气象中心预报员专项(Y201206)资助

摘　　要：为了弥补中国近海海区缺乏洋面风场观测资料,提高海洋气象预报能力,对MetOP-A极轨卫星搭载的ASCAT散射计反演风场资料和中国气象局在近海布设的18个浮标站测风资料进行对比。结果表明,离岸较远的海域中ASCAT反演风场的质量要优于离岸较近的海域,在较远的海域中,ASCAT风速和浮标观测风速的平均偏差为0.9 m·s^(-1),ASCAT的风速高于浮标站的风速,平均绝对偏差和均方根误差分别为1.2和1.4 m·s^(-1),风速的相关系数为0.94。统计特征分析结果显示,ASCAT散射计风场资料在中国近海有较好的可信度,在高风速的时候,ASCAT和浮标资料一致性较好,而低风速时候,ASCAT比浮标略偏大。目前,中央气象台正在逐步开展ASCAT资料的业务应用,ASCAT洋面的MICAPS格式产品和图形产品现已实现准实时运行。The new scatterometer Advanced SCATterometer （ASCAT） onboard MetOP-A satellite pro- vides surface wind speed and direction over global oceans with a spatial resolution of 25 km and 12.5 km square over two swaths. The accuracy of ASCAT retrieved wind is determined through various speed and direction comparisons with moored buoys laid by China Meteorological Administration （CMA）. The wind speed bias between ASCAT and buoys is 0.9 m·s^-1. The average absolute error and root-mean-squared difference are 1.2 m·s^-1 and 1.4 m·s^-1, respectively. The ASCAT wind over China offshore sea is credible with the correlation coefficient of wind speed between ASCAT and buoys is 0.94. And the primary operational application of ASCAT winds is on processing gradually in National Meteorological Centre （NMC）, which can provide text data and PNG figures quasi real time.

关 键 词：海洋气象预报 散射计 ASCAT反演风场 浮标 检验与应用 

分 类 号：P413[天文地球—大气科学及气象学]