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臺灣東部海洋鋒面分析及其對魚群移動分布影響之研究

  • 日期:102-02-04
  • 計畫編號:101農科-11.2.2-水-A1(2)
  • 年度:2012
  • 領域:漁業科技研發領域
  • 主持人:曾振德
  • 研究人員:曾振德、劉姵妤、陳世欽

本研究已完成處理分析2008-2012年3至8月份臺灣東部黑潮海域之衛星海面水溫影像,並利用直方圖邊緣偵測技術,萃取出水溫鋒面,探討其時空分布特性及其對雨傘旗魚漁獲量變化之影響。初步結果如下:1.臺灣東部黑潮海域3月份之平均海面水溫為25.2℃,8月份為29.0℃,其中3-5月份水溫梯度變化較大,容易形成水溫鋒面;2.已完成每日臺灣東部黑潮海域之水溫鋒面數值圖層共計920幅,並處理獲得月別水溫鋒面發生機率分布圖;3.臺灣東部黑潮海域每年5或6月份之水溫鋒面發生機率最高,分別為4.52%及3.49%,同時期之雨傘旗魚漁獲量也達到最高,兩者間呈正相關(r=0.35);4.臺灣東部黑潮主流軸離岸遠近,會影響雨傘旗魚漁獲量高低,其中臺東新港地區之黑潮主流軸離岸距離與雨傘旗魚漁獲量間呈正相關(r=0.45);5.完成建置101年度衛星水溫圖資料庫,提供漁民尋找合適作業漁場,減少油耗成本及增進漁撈作業效率。

研究報告摘要(英)


Satellite-derived sea surface temperature (SST) images from March to August of 2008-2012 have been used to detect oceanic fronts based on the Cayula-Cornillon edge detection algorithm and to examine its spatio-temporal effects on sailfish catch in the Kuroshio waters east of Taiwan. The preliminary results are as follows: 1. Monthly SST images of Kuroshio waters have been processed and analyzed. It shows that the low monthly average SST is 25.2℃ in March and 29.0℃ in August. Ocenaic fronts with a large SST gradient were usually detected from March to May. 2. A total of 920 daily oceanic fronts and their monthly frontal probabilities have been extracted and calculated using the OSTIA SST images in the Kuroshio waters east of Taiwan. 3. More oceanic fronts had been found in May or June in each year, their frontal probabilities are 4.52% and 3.49%, respectively. The high frontal probabilities in May and June were associated with their corresponding monthly high sailfish catch in Kuroshio waters east of Taiwan. 4. The positive correlation (r=0.45) between the distances from Kuroshio axis to the eastern coast of Taiwan. 5. The satellite-derived SST images database was set up to provide our fishermen finding suitable fishing grounds. It can reduce costs of fuel consumption and improve the efficiency of fishing operations.