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南海中部上层海洋湍流混合的空间分布特征及参数化模型

DOI: 10.3969/j.issn.0253-4193.2015.05.003

Keywords: 湍动能耗散率 南海 空间变化 参数化模型

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Abstract:

通过对2010年5月南海16°N和14.5°N断面的湍流微结构剖面观测资料分析,给出了南海海盆上层湍流混合空间分布特征:在16°N断面上,上层10~400 m垂向平均湍动能耗散率<ερ>在东侧略大于西侧;相反,在14.5°N断面上,西侧<ερ>均值约是东侧<ερ>的4倍,其中,西侧110.5°~111°E的<ερ>的平均值为2.6×10-6 W/m3,东侧118.5°E的<ερ>仅为5.89×10-7 W/m3。通过分析细结构剪切和湍流混合的相关性,发现剪切是南海中部上层强湍流混合的主要驱动力,揭示了高模态内波破碎可能是湍流混合的主要机制。另外,研究了大洋中的3种参数化模型,发现适用于大洋近海的参数化MacKinnon-Gregg(MG)模型能较好地用浮频和剪切估算南海中部深海区上层湍流耗散率

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