| 摘要: |
| 利用1987到2011年期间7个航次的调查数据揭示了夏季钓鱼岛东北海域存在冷涡的事实，首次将其命名为钓鱼岛东北冷涡，并初步分析了钓鱼岛东北冷涡特征及其生长消亡规律。结果表明：钓鱼岛东北冷涡是由底层海水涌升形成的中尺度冷涡，但其凸起的温盐等值线不能在海表面露头，不能从海表层水文特征识别该涡；该涡尺度在150km左右，其水团特征盐度为34.70-34.80，特征温度低于20℃；该涡是季节性冷涡，每年夏季都会出现，该涡5、6月份开始形成，到8月份强度最强，此时其向上涌升的趋势可以达到水深30m以浅，然后开始减弱，可以持续到10月份左右，其它时间则不存在；从50m层的温盐特征来看，不同年份夏季冷涡核心位置稍有不同，整体位置在123.2-124.2°E，26-27°N的范围内。 |
| 关键词: 东海南部 钓鱼岛 冷涡 变化规律 |
| DOI：10.11693/hyhz20161100258 |
| 分类号:P731 |
| 基金项目:国家自然科学基金委面上项目，41376031号；国家自然科学基金委青年项目，41306021号；中国科学院战略性先导科技专项项目，XDA11020301号；国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目，U1406401号；国家自然科学基金委员会-创新研究群体科学基金，41421005号。 |
附件 |
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| SEASONAL VARIATION OF COLD VORTEX NORTHEAST OF DIAOYU ISLAND |
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ZHANG Yan-Sheng1,2, YU Fei1, SI Guang-Cheng1
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1.Institute of Oceanology, the Chinese Academy of Sciences, Qingdao 266071, China;2.University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| CTD data obtained in seven cruises from 1987 to 2011 were used to analyze the characteristic and seasonal variation of a vortex northeast of the Diaoyu Island, East China Sea. Results show that the vortex, about 150km in scale, is a mesoscale cold vortex formed by upwelling of bottom water. The characteristic salinity is 34.70-34.80 and temperature 20℃. It is a seasonal vortex and occurs every summer, initiates in May or June, summits in August by reaching up to 30m below surface, and disappears in around October. The thickness of thermocline is about 20m, and the temperature gradient could reach 0.5℃/m. Shown in the distributions of salinity and temperature at 50m depth, the position of the vortex cores can be located in 123.2-124.2°E, 26-27°N, and may slightly shift in different years. |
| Key words: South of the East China Sea Diaoyu Island cold vortex variation |
