摘要
针对降雨导致散射计洋面风速反演精度低的问题,利用ASCAT和QUIKSCAT散射计洋面风速数据和浮标数据,引入降雨率参数,首先开展晴空条件下浮标风速与散射计洋面风速空间配准分析,研究了不同空间窗口散射计洋面风速配准误差分布规律,给出了最优空间配准参数;然后分析了特定降雨率条件下不同频段散射计洋面风速误差;最后利用最优空间配准参数获取的训练数据集和测试数据集,构建了降雨情况下洋面风速精度改进模型。结果表明:ASCAT风速误差由2.5 m/s降到1.4 m/s,QUIKSCAT风速误差由4.3 m/s降到2.2 m/s。
The accuracy of sea surface wind speed measurements by spaceborne ASCAT and QUIKSCAT scatterometers during rain is improved in this study using spatial matching of the measured scatterometer sea surface wind speeds with in-situ buoy data for various spatial windows determined to be the optimal window angle.Then,the ASCAT and QUIKSCAT scatterometer sea surface wind speed errors were analyzed for typical rain rates to develop a more accurate scatterometer wind speed model during rain.Tests show that the ASCAT wind speed errors decrease from 2.5 m/s to 1.4 m/s,while the QUIKSCAT wind speed errors decrease from 4.3 m/s to 2.2 m/s.
作者
姜祝辉
张伟
JIANG Zhuhui;ZHANG Wei(Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China;LAGEO,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;China Satellite Maritime Tracking and Controlling Department,Jiangyin 214431,China)
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第11期1334-1340,共7页
Journal of Tsinghua University(Science and Technology)
基金
中国高分辨率对地观测系统重大专项(02020A05058)。
关键词
降雨
散射计
空间配准
洋面风速
rain
scatterometer
spatial matching
sea surface wind speed
