TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 62 (No. 3), pp. 395-404, 2006

Correction of the Effect of Relative Wind Direction on Wind Speed Derived by Advanced Microwave Scanning Radiometer

Masanori Konda1*, Akira Shibata2, Naoto Ebuchi3 and Kohei Arai4

1Department of Geophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
2Earth Observation Research and Application Center, Japan Aerospace Exploration Agency, Tokyo 104-6023, Japan
3Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
4Department of Information Science, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan

(Received 26 August 2005; in revised form 27 February 2006; accepted 27 February 2006)

Abstract: The sea surface wind speed (SSWS) derived by a microwave radiometer can be contaminated by changes of the brightness temperature owing to the angle between the sensor azimuth and the wind direction (Relative Wind Direction effect: RWD effect). We attempt to apply the method proposed by Konda and Shibata (2004) to the SSWS derived by Advanced Microwave Scanning Radiometer (AMSR) on Advanced Earth Observing Satellite II (ADEOS-II), in order to correct for the RWD effect. The improvement of accuracy of the SSWS estimation amounts to roughly 60% of the error caused by the RWD effect. Comparison with in situ observation at the Tropical Atmosphere Ocean (TAO) array shows that the root mean square error of the corrected SSWS is 1.1 ms-1. It is found that the impact of the RWD effect on the estimation of the latent heat flux can amount to about 30 Wm-2 on average. We applied the method to the SSWS derived by AMSR for Earth Observing System (AMSR-E) and obtained a similar result.

*Corresponding author E-mail: konda@kugi.kyoto-u.ac.jp

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