An improved wind retrieval algorithm for the HY-2A scatterometer

Zhixiong Wang; Chaofang Zhao; Juhong Zou; Xuetong Xie; Yi Zhang; Mingsen Lin

doi:10.1007/s00343-015-4145-3

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An improved wind retrieval algorithm for the HY-2A scatterometer

OriginalPaper | Updated：2023-05-16

- An improved wind retrieval algorithm for the HY-2A scatterometer
- An improved wind retrieval algorithm for the HY-2A scatterometer
- 海洋湖沼学报（英文） 2015年33卷第5期页码：1201-1209
- Affiliations：
  
  1. Ocean Remote Sensing Institute Ocean University of China
  2. National Satellite Ocean Application Service State Oceanic Administration
  3. Guangzhou University
- Author bio：
- Funds：
  
  Supported by the National High Technology Research and Development Program of China (863 Program) (No. 2013AA09A505), the Shandong Joint Fund for Marine Science Research Centers (No. U1406404), the National Natural Science Foundation of China (No. 41106152), and the National Key Technology R&D Program of China (No. 2013BAD13B01)
- DOI：10.1007/s00343-015-4145-3
  中图分类号：
- 网络首发：2014-11-06，
  
  纸质出版：2015
- Accepted：
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An improved wind retrieval algorithm for the HY-2A scatterometer[J]. 海洋湖沼学报（英文）, 2015,33(5):1201-1209.

Wang, Z., Zhao, C., Zou, J. et al. An improved wind retrieval algorithm for the HY-2A scatterometer., Chin. J. Ocean. Limnol. 33, 1201–1209 (2015). https://doi.org/10.1007/s00343-015-4145-3
An improved wind retrieval algorithm for the HY-2A scatterometer[J]. 海洋湖沼学报（英文）, 2015,33(5):1201-1209. DOI： 10.1007/s00343-015-4145-3.

Wang, Z., Zhao, C., Zou, J. et al. An improved wind retrieval algorithm for the HY-2A scatterometer., Chin. J. Ocean. Limnol. 33, 1201–1209 (2015). https://doi.org/10.1007/s00343-015-4145-3 DOI：

摘要

Abstract

Since January 2012

the National Satellite Ocean Application Service has released operational wind products from the HY-2A scatterometer (HY2-SCAT)

using the maximum-likelihood estimation (MLE) method with a median filter. However

the quality of the winds retrieved from HY2-SCAT depends on the sub-satellite cross-track location

and poor azimuth separation in the nadir region causes particularly low-quality wind products in this region. However

an improved scheme

i.e.

a multiple solution scheme (MSS) with a two-dimensional variational analysis method (2DVAR)

has been proposed by the Royal Netherlands Meteorological Institute to overcome such problems. The present study used the MSS in combination with a 2DVAR technique to retrieve wind data from HY2-SCAT observations. The parameter of the empirical probability function

used to indicate the probability of each ambiguous solution being the “true” wind

was estimated based on HY2-SCAT data

and the 2DVAR method used to remove ambiguity in the wind direction. A comparison between MSS and ECMWF winds showed larger deviations at both low wind speeds (below 4 m/s) and high wind speeds (above 17 m/s)

whereas the wind direction exhibited lower bias and good stability

even at high wind speeds greater than 24 m/s. The two HY2-SCAT wind data sets

retrieved by the standard MLE and the MSS procedures were compared with buoy observations. The RMS error of wind speed and direction were 1.3 m/s and 17.4°

and 1.3 m/s and 24.0° for the MSS and MLE wind data

respectively

indicating that MSS wind data had better agreement with the buoy data. Furthermore

the distributions of wind fields for a case study of typhoon Soulik were compared

which showed that MSS winds were spatially more consistent and meteorologically better balanced than MLE winds.

关键词

Keywords

references

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