基于多套数据的印度洋深层经向翻转环流的动力特征

发布时间：2018-06-14 16:05

本文选题：深层经向翻转环流 + Ekman部分　；参考：《热带海洋学报》2016年04期

【摘要】：基于六套模式产品,研究了时间平均状态下印度洋深层经向翻转环流的动力特征。时间平均状态下,印度洋深层经向翻转环流(meridional overturning circulation,MOC)在各套数据中呈现一致的结构,即底层和深层水体向北进入印度洋,中上层往南流出印度洋的逆时针翻转结构。通过对经向翻转环流的动力分解,文章分析了其各动力部分在各套数据中的异同。在各套数据中,在南印度洋Ekman部分呈现一致的逆时针翻转结构,在10°S强度最大;地转和外模部分在10°S以南分别呈现相似的顺时针和逆时针的翻转结构,在27°S强度最大且符号相反;相对而言,Ekman部分在20°S及赤道之间,对MOC的影响更明显,而地转及外模部分则在25°S以南的区域更明显。基于不同的动力热力强迫,各套数据中各动力部分流函数的空间范围及强度存在显著差异:由于各套数据的风场相差不大,因此Ekman部分的整体结构相似,强度差异较小;对于地转部分,各数据表现出的顺时针翻转结构强度的差异主要受内区斜压流场强弱和西边界流结构的影响,内区斜压流场越强,翻转结构越强;西边界流流幅越宽,对内区斜压流场影响越大,对翻转结构强度的削弱越大;外模部分翻转结构的强度受西边界流强度的影响:西边界流强度越大,外模部分翻转结构强度越大。
[Abstract]:Based on six sets of model products, the dynamic characteristics of the deep meridional reversal circulation in the Indian Ocean under the time average state are studied. Under the time-averaged condition, the meridional overturning circulation of the deep meridional overturning circulation of the Indian Ocean shows a consistent structure in various sets of data, i.e. the reverse clockwise turnover structure of the bottom and deep water bodies entering the Indian Ocean northward and the upper meridional overturning circulation flowing out of the Indian Ocean to the south. Through the dynamic decomposition of the meridional reversal circulation, this paper analyzes the similarities and differences of each dynamic part in each set of data. In each set of data, the Ekman part of the southern Indian Ocean showed a consistent counterclockwise inversion structure with the maximum intensity at 10 掳S, and the geostrophic and outer mode parts showed similar clockwise and counterclockwise flipping structures south of 10 掳S, respectively. The maximum intensity of 27 掳S and the opposite sign, the Ekman part is between 20 掳S and the equator, the effect on MOC is more obvious, and the geostrophic and outer mode part is more obvious in the area south of 25 掳S. Based on the different dynamic thermal forcing, there are significant differences in the spatial range and strength of the flow function of each set of data: because the wind field of each set of data is not different, the Ekman part is similar in structure and small in strength; For geostrophic part, the intensity difference of clockwise inverted structure in each data is mainly affected by the intensity of baroclinic flow field in inner region and the structure of western boundary flow. The stronger the baroclinic flow field in the inner region is, the stronger the turnover structure is, and the wider the flow amplitude of west boundary flow is. The greater the influence on the baroclinic flow field in the inner region, the greater the intensity of the overturned structure, and the greater the intensity of the western boundary flow is, the greater the strength of the outer mode part of the flipping structure is, and the more the strength of the outer mode part of the inverted structure is, the greater the intensity of the western boundary flow is.
【作者单位】：热带海洋环境国家重点实验室(中国科学院南海海洋研究所);中国科学院大学;中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室;
【基金】：中国科学院战略性先导科技专项(A类)(XDA11010301) 国家自然科学基金(41376024) 国家重点基础研究发展计划(2013CB956204)~~
【分类号】：P731.27

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