農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

本計畫96年度共已提供65家遠洋業者，超過200艘遠洋漁船，使用衛星資訊服務系統建置之衛星水溫圖共計10,134幅。另本研究利用1998至2006年之衛星水溫水色影像資料，以經驗正交函數及小波分析等方法，解析中西太平洋暖池區之水文時空動態。初步分析結果顯示，利用衛星海面水溫29.5℃等溫線及海洋水色（葉綠素濃度）0.15 mg m-3等值線，分別作為中西太平洋暖池區及赤道東太平洋冷水舌的空間分佈指標，兩者均出現明顯的經度向（東—西方向）移動變化。另外，由經驗正交函數分析結果，其第一主成分影像顯示低水溫高葉綠素濃度（高基礎生產量）的冷水舌，由赤道東太平洋海域向西擴展可達東經160度附近海域。而本研究結果也顯示發生ENSO事件的2002及2006年，中西太平洋暖池區的高溫海水會向東擴展，同時具低水溫高葉綠素濃度的冷水舌，則退縮至赤道東太平洋海域，其中2004年冷水舌的空間分佈指標（葉綠素濃度0.15 mg m-3等值線）已退縮至西經 170度附近海域。

The satellite images service system had been installed to provide more than 200 fishing boats from the 65 memberships of Taiwan Tuna and Squid Associations in 2007. The satellite images database also had collected the various 10,134 satellite images around the far sea fishing grounds. Additionally, the dominant spatial and temporal patterns of 9-year (1998-2006) satellite-derived monthly SST and Chl-a data were examined by empirical orthogonal function (EOF) and wavelet analysis in this study. Preliminary results found an apparent longitudinal movement of specific SST isotherm (29.5 degree Celsius) and Chl-a contour (0.15 mg m-3) of the warm pool which was related to ENSO event. The dominant modes of EOF analysis also showed that the lower SST and higher Chl-a concentration (i.e. higher primary production) subsurface water (known as the cold tongue) extended westward to the eastern side of warm pool near 160E. However, this cold tongue had an obvious withdrawal to the eastern equatorial Pacific during the ENSO events in 2002 and 2006 as indicated by the Chl-a contour (0.15 mg m-3) moving back to near 170W in 2004.