Evaluation of Vector Winds Observed by NSCAT in the Seas around Japan |
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| Authors: | Harunobu Masuko Kohei Arai Naoto Ebuchi Masanori Konda Masahisa Kubota Kunio Kutsuwada Teruko Manabe Akira Mukaida Tetsuo Nakazawa Atsushi Nomura Akira Shibata Yoshihiko Tahara |
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| Institution: | (1) Communications Research Laboratory, Ministry of Posts and Telecommunications, 4-2-1, Nukui-kita-machi, Koganei, Tokyo, 184-8795, Japan;(2) Department of Information Science, Saga University, 1 Honjo, Saga, 840-8502, Japan;(3) Graduate School of Science, Tohoku University, Aoba, Sendai, 980-8578, Japan;(4) Kyoto University, Kyoto, 606-8502, Japan;(5) School of Marine Science and Technology, Tokai University, 3-20-1 Orido, Shimizu, Shizuoka, 424-8610, Japan;(6) Climate and Marine Department, Japan Meteorological Agency, 1-3-4 Otemachi, Chiyoda-ku, Tokyo, 100-8122, Japan;(7) Remote Sensing Technology Center of Japan, 1-9-9 Roppongi, Minato-ku, Tokyo, 106-0032, Japan;(8) Meteorological Research Institute, 1-1 Nagamine, Tsukuba, 305-0052, Japan;(9) Forecast Department, Japan Meteorological Agency, 1-3-4 Otemachi, Chiyoda-ku, Tokyo, 100-8122, Japan;(10) National Space Development Agency of Japan, 1-9-9 Roppongi, Minato-ku, Tokyo, 106-0032, Japan |
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| Abstract: | In order to validate wind vectors derived from the NASA Scatterometer (NSCAT), two NSCAT wind products of different spatial resolutions are compared with observations by buoys and research vessels in the seas around Japan. In general, the NSCAT winds agree well with the wind data from the buoys and vessels. It is shown that the root-mean-square (rms) difference between NSCAT-derived wind speeds and the buoy observations is 1.7 ms–1, which satisfies the mission requirement of accuracy, 2 ms–1. However, the rms difference of wind directions is slightly larger than the mission requirement, 20°. This result does not agree with those of previous studies on validation of the NSCAT-derived wind vectors using buoy observations, and is considered to be due to differences in the buoy observation systems. It is also shown that there are no significant systematic trends of the NSCAT wind speed and direction depending on the wind speed and incidence angle. Comparison with ship winds shows that the NSCAT wind speeds are lower than those observed by the research vessels by about 0.7 ms–1 and this bias is twice as large for data observed by moving ships than by stationary ships. This result suggests that the ship winds may be influenced by errors caused by ship's motion, such as pitching and rolling. |
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| Keywords: | NSCAT scatterometer surface wind vectors remote sensing |
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