| 引用本文: | 林道荣,吴文凡,刘子洲,殷冰冰,张利,张乃鹏,孙超,袁鹏杰,翟方国.莱州湾夏季环流垂向结构及其影响机制的研究[J].海洋科学,2023,47(5):54-65. |
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| 莱州湾夏季环流垂向结构及其影响机制的研究 |
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林道荣1, 吴文凡1, 刘子洲1, 殷冰冰2, 张利2, 张乃鹏3, 孙超3, 袁鹏杰3, 翟方国1
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1.中国海洋大学 海洋与大气学院, 山东 青岛 266100;2.黄河水利委员会 山东水文水资源局, 山东 济南 250100;3.东营市水文中心, 山东 东营 257000
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| 摘要: |
| 完善莱州湾三维环流结构,对进一步认识莱州湾海域的物质输运和生态环境保护具有重要科学意义,但前人对于莱州湾环流三维结构的研究相对较少。本文基于一套高分辨率的海洋数值模式,从三维角度研究了莱州湾夏季8月份环流的气候态特征及其影响机制。数值研究表明,莱州湾夏季环流垂向结构呈现双层环流特征,其中在跨等深线方向,环流的双层结构环流特征比较显著且存在显著的密度锋面结构。动量诊断的结果进一步表明,这种双层结构环流的形成与底层密度锋面所导致的斜压梯度力密切相关。此外,通过量化温盐场对于密度锋面的贡献,本文证实了温度梯度是莱州湾顶的密度锋面的主要影响因素,其对斜压梯度力的贡献占比达到99%,而盐度梯度对于莱州湾中部区域的密度锋面十分重要,对斜压梯度力的贡献占比达到58%,这与夏季黄河所带来的淡水通量密切相关。 |
| 关键词: 双层结构环流 数值研究 动量诊断 斜压梯度力 温盐场 |
| DOI：10.11759/hykx20221121003 |
| 分类号:P731.2 |
| 基金项目:山东省自然科学基金项目(ZR2020MD059) |
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| Vertical structure of summer circulation in Laizhou Bay and its influencing mechanism |
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LIN Dao-rong1, WU Wen-fan1, LIU Zi-zhou1, YIN Bing-bing2, ZHANG Li2, ZHANG Nai-peng3, SUN Chao3, YUAN Peng-jie3, ZHAI Fang-guo1
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1.College of Oceanography and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China;2.Yellow River Water Resources Commission Shandong Bureau of Hydrology and Water Resources, Jinan 250100, China;3.Dongying Hydrology Center, Dongying 257000, China
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| Abstract: |
| Further research on the three-dimensional circulation structure in Laizhou Bay is of great scientific importance to advance our understanding of material transport and ecological environmental protection in the Laizhou Bay waters. However, there are few studies on the three-dimensional structure of the circulation in Laizhou Bay. Motivated by this gap, this paper studies the basic characteristics of summer circulation and its influencing mechanism in Laizhou Bay using SCHISM, a three-dimensional high-resolution ocean numerical model, and the contributions of temperature and salinity to the influencing mechanism were quantitatively measured using the seawater state equation. SCHISM results revealed that the circulation in Laizhou Bay in the summer is characterized by double-layer circulation, with the surface circulation flowing outward and the bottom circulation flowing inward. Momentum diagnosis further showed that the formation of this double-layer circulation structure is closely related to the baroclinic gradient force caused by the bottom density front in which the surface circulation flows out of Laizhou Bay in the form of quasi-geostrophic flow; in contrast, the significantly increased bottom baroclinic gradient force and other momentum terms maintain the bottom flow into Laizhou Bay. In addition, across the isobathic direction, there is a significant density front structure in Laizhou Bay in the summer. By calculating the contribution of the density front, this paper confirms that the temperature gradient is the main factor affecting the density front at the top of Laizhou Bay and contributes 99% to the baroclinic gradient force, and the salinity gradient is very important to the density front in the central region of Laizhou Bay and contributes 58% to the baroclinic gradient force, which is closely related to the freshwater flux brought by the Yellow River in the summer. |
| Key words: double-layer circulation numerical study momentum diagnosis baroclinic gradient force temperature-salinity field |