浙江近海冬季大风风速推算和ASCAT风速订正方法探讨

发布时间：2018-02-27 16:12

本文关键词： 大风模糊聚类逐步回归浮标站 ASCAT 风速订正　出处：《气象》2016年05期 　论文类型：期刊论文

【摘要】：利用2010—2014年12月至次年2月浙江省自动气象站测风资料和ASCAT散射计反演的风场资料,通过模糊聚类空间分型,选取有代表性的站点建立浙江近海冷空气大风的风速推算公式,并对ASCAT近海风场产品进行误差分析和风速订正。结果表明:冷空气影响时浙江北部近海多数自动站与舟山浮标站相比有偏南风矢量差,南部近海自动站比温州浮标站有东南风矢量差,自动站风速一般小于浮标站。海拔高度与自动站和浮标站风速差值δ相关性不显著,站点离岸距离是影响δ的主要因子。冷空气影响时浙江近海ASCAT反演风速与实况相关系数的分布具有平行于海岸线且自西向东增大的特征,相关系数超过0.5的站点一般离岸30 km以上,舟山和温州12个浮标站测风与ASCAT反演风具有较好的相关性。浙江近海ASCAT风速的误差空间差异较大,经订正后的风速分布也具有平行于海岸线、自西向东逐渐增大的特征,且与观测的误差绝对值一般小于2 m·s~(-1)。
[Abstract]:Based on the wind data of Zhejiang automatic weather station from December to February of 2010-2014 and the wind field data retrieved by ASCAT scatterometer, the wind velocity calculation formula of cold air gale in Zhejiang coastal waters is established by fuzzy clustering spatial classification. The error analysis and wind speed correction of ASCAT offshore wind field products are also carried out. The results show that most of the offshore automatic stations in the northern part of Zhejiang Province are different from the Zhoushan buoy station in the south wind vector under the influence of cold air. Compared with Wenzhou buoy station, the southern offshore automatic station has the difference of southeast wind vector, and the wind speed of automatic station is generally smaller than that of buoy station. There is no significant correlation between altitude and air speed difference 未 between automatic station and buoy station. Offshore distance is the main factor affecting 未. The distribution of wind speed inversion wind speed and actual correlation coefficient of ASCAT inversion in Zhejiang coastal waters is parallel to the coastline and increases from west to east. When the correlation coefficient is more than 0.5, the wind measurement of 12 buoy stations in Zhoushan and Wenzhou has a good correlation with the ASCAT inversion wind, and the error of ASCAT wind speed in Zhejiang coastal waters is quite different, and the correlation coefficient is more than 30 km offshore. The revised wind speed distribution is also parallel to the coastline and gradually increases from west to east, and the absolute value of the observed error is generally less than 2 m 路s-1 ~ (-1).
【作者单位】：浙江省宁波市气象台;宁波大学宁波市非线性海洋和大气灾害系统协同创新中心;浙江省奉化市气象局;
【基金】：浙江省自然科学基金(LY15D050001) 宁波市科技计划项目(2012C50044) 宁波市气象局科技计划项目(NBQX2014005B)共同资助
【分类号】：P714.2

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