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Title: 利用MODIS衛星資料觀測東海赤潮現象
Using MODIS satellite data to detect red tide in the East China Sea
Authors: Chin-Yuan Hung
洪槿芫
Contributors: NTOU:Department of Marine Environmental Informatics
國立臺灣海洋大學:海洋環境資訊學系
Keywords: 東海;赤潮;赤潮指標;MODIS;經驗正交函數
East China Sea;Red tide;Red tide Index;MODIS;Empirical Orthogonal Function
Date: 2010
Issue Date: 2011-06-30T08:15:43Z
Abstract: 本研究係利用MODIS波段443nm衛星資料定義一赤潮指標,以探討東中國海域赤潮之時空變化,並透過中國官方赤潮記錄與MODIS衛星赤潮指標之日和週平均影像以追蹤東海赤潮事件發生過程。而經由赤潮指標長期月平均影像發現東海赤潮主要發生在4至6月,且集中在長江口外沿海地區。此外,利用經驗正交函數分析2002年7月至2009年12月的MODIS衛星赤潮指標月平均資料,第一主成分結果顯示東海赤潮集中於長江口外至300公尺等深線海域,且東海赤潮最高值發生在春季,而秋季次之,冬季則值最低。在跨年變化方面,以2007冬季至2008春季之反聖嬰期之變化幅度最大。第二主成分則突顯東海西北近海及東南外海地區赤潮指標冬夏之季節交替,但相對於第一主成分則屬微量變化。
In this study, the MODIS band 443nm satellite data is considered to develop a red tide index (RI) to see the temporal and spatial variation of the red tide in the East China Sea (ECS). The daily and weekly MODIS RI images can be used to track red tide change through the China official red tide records. The climatologically monthly RI images show the red tide in the ECS mainly happen in April to June and concentrated in the coastal area off Yangtze River. Furthermore, the Empirical Orthogonal Function (EOF) analysis of the monthly RI data can be used to see the main inter-annual variation of the red tide in the ECS. The EOF mode 1 results indicate again that the red tide mainly occur in the water off the Yangtze River with the depth less than 300 m. Meanwhile, the abundant red tide mainly in spring, the minor peak is in fall, while winter is the least season to develop red tide in the ECS. The 1st EOF also shows a tremendous large variation of the red tide in the ECS during the La Niña period from the winter 2007 to spring 2008. The 2nd EOF results emphasize the seasonal vibration between winter and summer of the red tide in the northwestern and southeastern ECS, but it is the minor variation compared with EOF mode 1 results.
URI: http://ethesys.lib.ntou.edu.tw/cdrfb3/record/#G0M97810011
http://ntour.ntou.edu.tw/ir/handle/987654321/15604
Appears in Collections:[海洋環境資訊系] 博碩士論文

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