Evaluation of HY-2A Scatterometer Wind Vectors Using Data from Buoys, ERA-Interim and ASCAT during 2012-2014

作者:Xing, JY (Xing, Jianyong)[ 1,2,3 ] ; Shi, JC (Shi, Jiancheng)[ 1,4 ] ; Lei, YH (Lei, Yonghui)[ 1,4 ] ; Huang, XY (Huang, Xiang-Yu)[ 5 ] ; Liu, ZQ (Liu, Zhiquan)[ 6 ]

REMOTE SENSING

卷: 8  期: 5

文献号: 390

DOI: 10.3390/rs8050390

出版年: MAY 2016

摘要

The first Chinese operational Ku-band scatterometer on board Haiyang-2A (HY-2A), launched in August 2011, is designed for monitoring the global ocean surface wind. This study estimates the quality of the near-real-time (NRT) retrieval wind speed and wind direction from the HY-2A scatterometer for 36 months from 2012 to 2014. We employed three types of sea-surface wind data from oceanic moored buoys operated by the National Data Buoy Center (NDBC) and the Tropical Atmospheric Ocean project (TAO), the European Centre for Medium Range Weather Forecasting (ECMWF) reanalysis data (ERA-Interim), and the advanced scatterometer (ASCAT) to calculate the error statistics including mean bias, root mean square error (RMSE), and standard deviation. In addition, the rain effects on the retrieval winds were investigated using collocated Climate Prediction Center morphing method (CMORPH) precipitation data. All data were collocated with the HY-2A scatterometer wind data for comparison. The quality performances of the HY-2A NRT wind vectors data (especially the wind speeds) were satisfactory throughout the service period. The RMSEs of the HY-2A wind speeds relative to the NDBC, TAO, ERA-Interim, and ASCAT data were 1.94, 1.73, 2.25, and 1.62 m.s(-1), respectively. The corresponding RMSEs of the wind direction were 46.63 degrees, 43.11 degrees, 39.93 degrees, and 47.47 degrees, respectively. The HY-2A scatterometer overestimated low wind speeds, especially under rainy conditions. Rain exerted a diminishing effect on the wind speed retrievals with increasing wind speed, but its effect on wind direction was robust at low and moderate wind speeds. Relative to the TAO buoy data, the RMSEs without rain effect were reduced to 1.2 m.s(-1) and 39.68 degrees for the wind speed direction, respectively, regardless of wind speed. By investigating the objective laws between rain and the retrieval winds from HY-2A, we could improve the quality of wind retrievals through future studies.

通讯作者地址: Lei, YH (通讯作者)

Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China.

通讯作者地址: Lei, YH (通讯作者)

       JCGCS, Beijing 100875, Peoples R China.

地址:

[ 1 ] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China

[ 2 ] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[ 3 ] SOA, Natl Marine Environm Forecasting Ctr, Key Lab Res Marine Hazards Forecasting, Beijing 100081, Peoples R China

[ 4 ] JCGCS, Beijing 100875, Peoples R China

[ 5 ] Meteorol Serv Singapore, Ctr Climate Res Singapore, Singapore 537054, Singapore

[ 6 ] Natl Ctr Atmospher Res, Boulder, CO 80301 USA