Observation of the Soya Warm Current using HF ocean radar

详细信息    查看全文

• 作者：Naoto Ebuchi ; Yasushi Fukamachi ; Kay I. Ohshima ; Kunio Shirasawa ; Masao Ishikawa ; Toru Takatsuka ; Takaharu Daibo and Masaaki Wakatsuchi
• 关键词：HF radar ; Soya Warm Current ; Sea of Okhotsk ; coastal current
• 刊名：Journal of Oceanography
• 出版年：2006
• 出版时间：February 2006
• 年：2006
• 卷：62
• 期：1
• 页码：47-61
• 全文大小：1,514 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Oceanography
  Hydrobiology
  
• 出版者：Springer Netherlands
• ISSN：1573-868X

文摘

Three High Frequency (HF) ocean radar stations were installed around the Soya/La Perouse Strait in the Sea of Okhotsk in order to monitor the Soya Warm Current (SWC). The frequency of the HF radar is 13.9 MHz, and the range and azimuth resolutions are 3 km and 5 deg., respectively. The radar covers a range of approximately 70 km from the coast. The surface current velocity observed by the HF radars was compared with data from drifting buoys and shipboard Acoustic Doppler Current Profilers (ADCPs). The current velocity derived from the HF radars shows good agreement with that observed using the drifting buoys. The root-mean-square (rms) differences were found to be less than 20 cm s−1 for the zonal and meridional components in the buoy comparison. The observed current velocity was also found to exhibit reasonable agreement with the shipboard ADCP data. It was shown that the HF radars clearly capture seasonal and short-term variations of the SWC. The velocity of the Soya Warm Current reaches its maximum, approximately 1 m s−1, in summer and weakens in winter. The velocity core is located 20 to 30 km from the coast, and its width is approximately 40 km. The surface transport by the SWC shows a significant correlation with the sea level difference along the strait, as derived from coastal tide gauge records at Wakkanai and Abashiri.