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1
題名:Upwelling Area Northeast of Taiwan on ERS-1 SAR Images    
台灣東北湧升流區的衛星雷達影像
著者:Ming-Kuang Hsu(許明光) ;Leonid M. Mitnik(米禮德) ;Cho-Teng Liu(劉倬騰)
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:湧升流 ; 東海 ; 衛星雷達 ; upwelling ; East China Sea ; ERS-1 SAR
刊名:ACTA Oceanographica Taiwanica
卷期:34卷3期(1995.9)
頁碼:27-38
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

當海面風速低於每秒八公尺時,衛星上的合成孔徑雷達(SAR)可偵測到多種海面下的現象,因為海面會受到水下現象的影響而增強或減弱其反射雷達訊號的能力。在SAR影像裡的台灣北部海域顏色較深(代表反射訊號較弱),可能是因海表面活性物較多,而減弱了反射雷達波的海面短波及漣漪。SAR影像中的帶狀、線狀及波狀結構,代表著黑潮邊界、中尺度渦流及內波等現象。卓格影像雖涵蓋100公里見方,但不如連續影像涵蓋區域較廣,較適於顯示關聯不同空間尺度的現象。由於台灣北部多雲,在SAR影像的三天內鮮有NOAA衛星的熱輻射現象可供湧升流的研究。未來的海上實測應評估各種自然因素對於SAR影像所顯示之湧升流及海洋現象的相對貢獻。特別是海面溫度、海面水色(葉綠素甲濃度)、海流及氣象參數,皆應在SAR飛過時的海洋實驗中連續量測。
Surface expressions of various oceanic phenomena are detectable by satellite Synthetic Aperture Radar (SAR) under wind speed less than 8 m/s. These manifestations may either enhance or reduce the radar signal in contrast to the background. The upwelling north of Taiwan in SAR images looks dark, representing weak radar signal. It is likely due to the increased concentration of natural surface films that damp the short gravity waves that backscatter the radar signal. The stretched slick bands, filament-like slicks and wave-like structures allowed us to detect Kuroshio front, mesoscale eddies, and internal waves. A strip of several images is more useful than individual frame in the visualization of the oceanic features such as the western Kuroshio front, internal waves, etc.. They may relate phenomena of different scales better. Due to the cloudiness north of Taiwan, few NOAA IR images were available for upwelling study within 1~3 days of the SAR passes. Future measurements need to be made to estimate the relative contribution of different natural factors that form SAR signatures of the upwelling and other oceanic phenomena. In particular, the SST, ocean color (chlorophyll a concentration), currents together with meteorological parameters need to be measured continuously during ship expeditions coinciding with the SAR passes.


    

本卷期目次
ACTA Oceanographica Taiwanica 34卷3期 (1995.9)
Coral Fauna of Tungsha Tao (Pratas Islands)/ Chang-Feng DaiTung-Yung FanCheng-Shi Wu
Particulate Free Amino Acids in the Surface Waters off Eastern and Southern Taiwan/ Rang HuangChien-Hwa Chang
Upwelling Area Northeast of Taiwan on ERS-1 SAR Images/ Ming-Kuang HsuLeonid M. MitnikCho-Teng Liu
Acoustic Transmission of Taiwan's Northeast Sea/ Chi-Fang ChenJang-Jia LinTai Lee
利用慣性消散法估算海面風應力及熱通量的研究/ 曾若玄李文鴻
Potential Anticancer Cembranolide Diterpenes from a Formosan Soft Coral Sinularia Flexibilis/ Chang-Yih DuhRei-Sheu HouChia-Han LiuKeryea Soong
 
   
 
   

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