| 摘要: |
| 为定量化研究影响中国东部近海逆温层产生和发展过程的主要因素，基于Princeton Ocean Model（POM），通过进行河流和暖流的增减试验，对逆温层的季节变化及其影响因素进行了分析。模拟结果显示，受海表失热影响，逆温层主要出现在9月至翌年3月份，山东半岛北部及东部近海、闽浙沿海为三个主要逆温层发生区域，其中山东半岛北部近海逆温层范围和强度最大。当无河流输入时，整个研究海域无逆温层出现，而河流加倍或减半对逆温层的影响主要体现在长江口邻近海域，出现概率分别增高22%和降低15%。当暖流加倍或减半时，长江口邻近海域逆温层出现概率大幅增高23%和降低69%，山东半岛东部近海次之，分别增高34%和降低25%。当关闭暖流时，长江口外海逆温层消失，山东半岛东部近海逆温层出现概率降低约70%，且变浅76%。以上表明，河流淡水是中国东部近海逆温层形成的必要条件，在保持必要河流淡水输入条件下，暖流的变化对中国东部近海逆温层形成的影响比河流变化大，其中对长江口外海影响最大，山东半岛东部近海次之。暖流流量的增减可引起100 m以浅陆架区的海表面高度异常，影响跨40 m等深线海水交换和温盐锋面的形成，造成逆温层大范围的转移和变化。 |
| 关键词: 长江冲淡水 台湾暖流 黑潮 逆温层 POM |
| DOI：10.11759/hykx20191118002 |
| 分类号: |
| 基金项目:国家自然科学基金项目（41576016）；中国科学院战略性先导专项项目（XDA11010304） |
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| Numerical study of the influence of river and warm advection on the temperature inversion in the eastern China seas |
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HAO Jia-jia1,2,3
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1.Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Laboratory for Ocean and Climate Dynamics, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266235, China;3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
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| Abstract: |
| To quantitatively study the main factors affecting the generation and development of the temperature inversion in the eastern China seas, the seasonal variations of the temperature inversion and its influencing factors are analyzed by setting up experiments of increasing and decreasing rivers and warm currents based on the Princeton Ocean Model (POM). Results show that the inversion layer mainly occurs from September to March as influenced by the negative net heat flux. Coastal areas off the northern Shandong Peninsula (NSP), eastern Shandong Peninsula (ESP), and Yangtze River Estuary (YRE) are the three main inversion layer occurrence areas, among which the inversion layers in the NSP are the strongest. There is no inversion absence river, and the effect of river discharge changes on the inversion layer is mainly reflected in the YRE with the probability of occurrence increased by 22% or decreased by 15%. When the warm current is doubled or halved, the occurrence probability in the YRE increases by 23% and decreases by 69%, followed by that in the ESP that increases by 34% and decreases by 25%. Inversions outside the YRE fade away warm currents, and the occurrence probability of inversions in the ESP decreases by about 70% and the inversion shallows by 76%. The results show that river fresh water is a necessary condition for the formation of inversions in the eastern China seas. The influence of the warm current on the inversions is greater than that of the river, among which the influence on the sea outside the YRE is the largest, followed by the ESP. The changes in warm currents can cause sea surface height anomalies in the seas with a height <100 m, influencing the cross-shelf exchange and strength of the temperature/salt fronts and resulting in the transfer and changes in the inversion layer in a large range. |
| Key words: Changjiang River fresh water Taiwan warm current Kuroshio temperature inversion POM |
