ASCAT近岸风在山东沿海的适用性分析

摘要

The validity of ASCAT sea surface wind data in Shandong coast sea is studied using observations at eight representative stations including buoy stations, island stations and coastal automatic stations from January 2013 to December 2014.Results show that ASCAT wind speed is positively correlated with observed wind speed.While the error of ASCAT wind speed is small, the error of retrieved wind direction is relative larger in Shandong coast sea.The quality of ASCAT wind data in Bohai Sea, Bohai Strait and the northern of Yellow Sea is better than that in the middle of Yellow Sea.Under different wind forces, the wind speed deviation of ASCAT from observation is apparently different.When the observed Beaufort wind force is or over grade 6, ASCAT wind speed is always lower than observation, and as observed wind force below grade 6, ASCAT wind speed is always higher.While the mean error of ASCAT wind speed is smaller under lower wind force, the ASCAT wind direction may has larger error than that under greater wind force.In general, ASCAT wind data has good validity in Shandong coast sea.When the observed Beaufort wind force below grade 6, ASCAT wind speed may has relative smaller error, and ASCAT wind direction is relative less reliable.%利用2013年1月-2014年12月山东近海的8个浮标站、海岛站和自动站资料与ASCAT近岸风速和风向进行对比,以分析ASCAT反演风场在山东沿海的适用性.研究发现:总体上看,ASCAT近岸风速与代表站实况风速正相关,ASCAT近岸风速在山东沿海误差较小,风向有明显的偏离.ASCAT近岸风在渤海、渤海海峡和黄海北部的适用性优于黄海中部.风力不同时,ASCAT近岸风速与实况偏差有明显差别,表现为当实况出现6级及以上的大风,ASCAT近岸风速小于实况;当实况出现6级以下的风,ASCAT近岸风速大于实况.就ASCAT风速偏差而言,6级以下的风速偏差小于6级及以上风.ASCAT近岸风向与实况偏差也有明显差别,当实况出现6级及以上的大风,ASCAT近岸风向与实况的偏离变小;当实况出现6级以下的风,ASCAT近岸风向与实况的偏离变大.因此,ASCAT近岸风速在山东沿海有较好的适用性,6级以下风更优;ASCAT近岸风向也有一定的适用性,6级及以上风向可用性比6级以下强.