1985-2005年东海海表温度时空变化特征分析

伍玉梅; 徐兆礼; 樊伟; 崔雪森

1985-2005年东海海表温度时空变化特征分析

中国水产科学研究院东海水产研究所渔业资源遥感信息技术重点开放实验室,上海 200090

基金项目: 国家自然科学基金重大研究计划(90511005);我国近海海洋综合调查与评价专项(908-02-01-03);863计划项目(2007AA092202);中央级公益性科研院所基本科研业务费专项资金(中国水产科学研究院东海水产研究所)资助项目(2007T09);中国科学院海洋环流与波动重点实验室开放基金课题(KLOCAW1010)。

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出版历程
- 收稿日期: 2009-11-13
- 修回日期: 2011-07-05

Change of sea surface temperature in East China Sea during 1985-2005

Key Laboratory of Fishery Resources Remote Sensing and Information Technology, Chinese Academy of Fishery Sciences, Shanghai 200090, China

摘要

摘要: 利用1985-2005年间AVHRR辐射计获取的东海海表温度资料,研究其时空变化特征。1985-2005年间东海海表平均温度总体呈上升趋势。对东海海温距平(SSTA)进行经验正交函数(EOF)分解,得到其2个主要变化模态,EOF1占总方差变化的34.8%,主要变化周期为3~5 a,表示1985-2005年中东海绝大部分海域的表层海水温度呈现增温现象,近海比外海增温幅度大。EOF2占总方差变化的10.7%,主要变化周期为2 a,显示东南与西北海区的温度异常呈反位相变化,近海海温由负异常为主转变为以正异常为主。东海SSTA以1996年5月为温度转折点,1996年5月前SSTA主要表现为负异常,之后以正异常为主,增暖特征明显。台湾海峡和东海南部海域的SSTA变化幅度基本相当,东海北部变化最剧烈,这3个海区均包含约5~7 a的变化周期,与ENSO的相当。ENSO对滞后其2 a左右的东海3个海区的SSTA变化影响显著,另外东海南部在滞后ENSO的8~9和16~18个月时也存在较强的响应,这主要缘于黑潮在赤道海温异常的北上输送过程中对东海的影响。与沿岸3个气象观测站的长年资料对比,东海北部海域的海温异常与该地区的气温变化关系最为密切,相关系数达到0.92。
- 东海 /
- SOI /
- 海表温度 /
- EOF /
- 谱分析
Abstract: The sea surface temperature (SST) data from AVHRR during 1985-2005 were applied to analyze the variability in East China Sea (ECS) and the warming trend is found in general. The Empirical Orthogonal Function (EOF) and Spectrum analysis were used to analyze the variability of SST anormality (SSTA). The first model (EOF1) explains 34.8% of the total variation and its main period is 3~5 a. It shows that there is a warming trend in most area and the largest variation appear in the inshore area.The period of EOF2 (10.7%) is 2 a and it denotes the change of SSTA in south-east area is opposite to that of north-west.The variation range of SSTA in Taiwan Strait and the south in ECS are similar, while that of the north is much stronger.They all contain the period of 5~7 a, same as that of ENSO.The SSTA in 3 area are affected strongly by ENSO and the 2a delay is obvious.There are 8~9 and 16~18 month delay between the south of ECS and ENSO. It mainly due to the anomalous Kuroshio transport. The SSTA of the north shows a close correlation with the variation of air temperature there and the correlation up to 0.92.
- East China Sea /
- SOI /
- SST /
- EOF /
- spectrum analysis

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