Share Email Print
cover

Proceedings Paper

Research on impact of upwelling on SAR-derived wind speeds along the Zhejiang coast
Author(s): Junfang Chang; Weigeng Huang; Xiulin Lou; Aiqin Shi
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Spaceborne synthetic aperture radar (SAR) plays an important role in sea surface wind field. Upwelling is a common oceanic phenomenon which influences the wind retrieving from SAR imagery. It smoothes the sea surface and its backscatter cross section in SAR images is low. The sea surface wind retrieved directly from SAR imagery in upwelling region will be underestimated. In this article, using sea surface temperature (SST) and chlorophyll2-a derived from EOS MODIS, the low backscatter features in ENVISAT ASAR image are analyzed along the Zhejiang Coast in the East China Sea. And CMOD4 algorithm is adopted to retrieve sea surface wind speed, using wind directions from interpolated NCEP / NCAR reanalysis data. Results show that wind speed is negatively biased due to the low Normalized Radar Cross Section (NRCS) associated with the Zhejiang Coastal Upwelling. Based on statistical method, the quantitative relationship between SAR-derived wind speeds and high resolution numerical meteorological model results is established. Then using this quantitative relationship, the underestimated wind speeds in upwelling region are corrected and the impact of coastal upwelling on SAR wind retrieval is quantitatively evaluated.

Paper Details

Date Published: 23 November 2011
PDF: 8 pages
Proc. SPIE 8006, MIPPR 2011: Remote Sensing Image Processing, Geographic Information Systems, and Other Applications, 80062J (23 November 2011); doi: 10.1117/12.902229
Show Author Affiliations
Junfang Chang, Ocean Univ. of China (China)
The Second Institute of Oceanography, SOA (China)
Weigeng Huang, The Second Institute of Oceanography, SOA (China)
Xiulin Lou, The Second Institute of Oceanography, SOA (China)
Aiqin Shi, The Second Institute of Oceanography, SOA (China)


Published in SPIE Proceedings Vol. 8006:
MIPPR 2011: Remote Sensing Image Processing, Geographic Information Systems, and Other Applications
Faxiong Zhang; Faxiong Zhang, Editor(s)

© SPIE. Terms of Use
Back to Top