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Estimating the geostrophic velocity obtained by HF radar observations in the upstream area of the Kuroshio |
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| Authors: | Ryoko Tokeshi Kaoru Ichikawa Satoshi Fujii Kenji Sato Shoichiro Kojima |
| Institution: | (1) Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan;(2) Research Institute for Applied Mechanics, Kyushu University, Kasuga-Koen, Kasuga, Fukuoka 816-8580, Japan;(3) Institute of Observational Research for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa 237-0061, Japan;(4) National Institute of Information and Communications Technology, Onna, Kunigami, Okinawa 904-0411, Japan;(5) Department of Electrical and Electronics Engineering, Faculty of Engineering, University of Ryukyus, Nishihara, Okinawa 903-0213, Japan |
| Abstract: | A method to extract geostrophic current in the daily mean HF radar data in the Kuroshio upstream region is established by comparison with geostrophic velocity determined from the along-track altimetry data. The estimated Ekman current in the HF velocity is 1.2% (1.5%) and 48° (38°)-clockwise rotated with respect to the daily mean wind in (outside) the Kuroshio. Furthermore, additional temporal smoothing is found necessary to remove residual ageostrophic currents such as the inertial oscillation. After removal of the ageostrophic components, the HF geostrophic velocity agrees well with that from the altimetry data with rms difference 0.14 (0.12) m/s in (outside) the Kuroshio. |
| Keywords: | High-Frequency Ocean Radar satellite altimetry upstream of the Kuroshio Ekman current geostrophic velocity inertial oscillation |
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