| 摘要: |
| 结合东海沿岸嵊山(北)和厦门(南)站1960—2001 年海表温度(SST)监测数据与东中国海1982—2011年AVHRR水温资料, 讨论了台站监测的空间代表范围, 分析了东海陆架SST年际变化的时空特征。结果表明, 嵊山和厦门站SST变化分别代表内陆架和台湾海峡。东海陆架52年来SST总体呈升温趋势, 冬季最为显著; 内陆架的升幅远大于台湾海峡。内陆架水温冬季分别在1977年和1995年发生两次跃升, 共升温2.34℃; 春、夏、秋季均在1994年发生冷暖转折, 分别升高1.19℃、1.43℃和1.16℃。台湾海峡水温冬季在1989年跃升0.91℃, 夏季在1987年跃升0.38℃, 春、秋季则在1996—1997年间分别升温0.80℃和0.58℃。全年水温变化最大处在长江口附近内陆架海区, 可能的主导因素是低盐水与外海水混合: 随季风、降水、径流变化的沿岸流、长江冲淡水和台湾暖流给该区域带来不同水团, 使得热量向下层输运减少, 从而导致东海内陆架升温快于其它海区。 |
| 关键词: 海表温度年际变化, 东海陆架, 台站监测水温数据, EOF |
| DOI：10.11693/hyhz201203033033 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划(973)项目, 2011CB403606 号, 2010CB428904 号; 国家自然科学基金重点项目, 40830854 号 |
附件 |
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| SPATIAL AND TEMPORAL INTER-ANNUAL VARIATIONS OF SEA SURFACE TEMPERATURE IN THE CONTINENTAL SHELF OF THE EAST CHINA SEA |
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LI Jia-Xing, WEI Hao, LUO Xiao-Fan
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College of Marine Science and Engineering, Tianjin University of Science and Technology
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| Abstract: |
| Using the AVHRR data (1982—2011) in the East China Sea (ECS) and the in-situ monitoring data (1960—2001) of Shengshan and Xiamen stations which are located at the northern and southern sides of the ECS coast, spatial and temporal inter-annual variations of sea surface temperature (SST) in the continental shelf of the ECS are analyzed. (1) Based on reliability analysis and verification of the satellite data, spatial distribution of correlation coefficients between SST time series of the coast stations and that of each lattice point in ECS are calculated, and it suggests that SST variation trends of this two stations have certain representativeness in broad shelf of the ECS, i.e. Shengshan represents the inner shelf and Xiamen represents the Taiwan Strait areas. (2) The in-situ monitoring data and the calibrated satellite data are merged into 52-year’s monthly SST from 1960 to 2011 and the inter-annual variations of SST in the inner shelf and the Taiwan Strait have been analyzed. The warming trends were found especially in winter and the inner shelf (Shengshan) became warming quickly than the Taiwan Strait (Xiamen). In the inner shelf, there were two winter SST shifts from cold to warm phase in 1977/1978 and in 1994/1995 respectively, and the temperature was increased by 2.34℃within 52 years. The shifts in spring, summer and autumn all existed in 1994, and the SST increased by 1.19℃, 1.43℃and 1.16℃in those seasons. In the Taiwan Strait, weaker shifts from cold to warm existed for all seasons, i.e. with 0.91℃rising in 1989/1990 in winter, with 0.38℃rising in 1987/1998 in summer, with 0.80℃rising in 1996/1997 in spring and with 0.58℃rising in 1995/1996 in autumn. (3) More quantitatively, a 30-year time series of AVHRR SST data is examined using EOF analysis to understand the spatial and temporal variations in continental shelf of ECS. The largest inter-annual variation was found in the inner shelf adjacent to the Changjiang estuary. This was mainly influenced by the mixing between seawater and freshwater. Coastal current, Taiwan Warm current and the Changjiang diluted water changed with monsoon and precipitation and brought different water masses. This could induced the less heat flux to the lower water column and made the SST increasing quickly than other areas like middle shelf of ECS or the Yellow Sea. |
| Key words: Inter-annual variations of SST, Continental shelf of ECS, Monitoring data of SST, EOF |
