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A study of Indian Ocean Subtropical Mode Water： subduction rate and water characteristics

ISSN号：0253-505X
期刊名称：《海洋学报：英文版》
时间：0
分类：P732[天文地球—海洋科学] TV551.31[水利工程—水利水电工程]
作者机构：[1]Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China, [2]College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
相关基金：Foundation item： The National Natural Science Foundation of China under contract Nos 41276011 and 41221063; the Research Project of Chinese Ministry of Education under contract No. 113041A; the Global Change and Air-Sea Interaction under contract under contract No. GASI-03-01-01-05.

作者： MA Jie[1,2], LAN Jian[1,2], ZHANG Ningning[1,2]

关键词：南印度洋, 过水, 俯冲, 速率, 副热带, 混合层深度, 特征, 密度等级, Indian Ocean Subtropical Mode Water, subduction rate, the layer of minimum vertical temperaturegradient, water characteristics

中文摘要：

在南方印度洋的年度 subduction 率被分析数据吸收(苏打) 在 19502008 的时期输出的简单海洋计算。为潜在的密度班的 subduction 率普查在南方印度洋副热带的旋回的西南的部分显示出相应于印度洋副热带的模式水(IOSTMW ) 的一座山峰。混合层深度越深，在现在的气候学的混合层前面和联系相对更快的发行量越 sharper 导致了更大的侧面的正式就职，它首先 dominants IOSTMW subduction 率，当时与从垂直的抽的仅仅次要的贡献。没有概论的损失，通过在最小的垂直温度坡度( LMVTG )的层的水特征的小心的分析，作者建议 IOSTMW 作为 thermostad 被识别，与低潜在的涡度的侧面的最小( PV ，吗不到 200 湯漠?敌????猯'T￣牯嘠污猼扵?????汁?桴獥??晲捡楴獮栠摡猠杩楮楦慣瑮愠瑣癩瑩?湡?瑳'L汩瑩?景攠畭獬晩捩瑡潩?湵敤?慶楲畯???牦浯??琠?㈱??琠浥数慲畴敲爠湡敧?牦浯㈠‰潴ㄠ?讬鶝??顟????醰?????? 颮鑈？？

英文摘要：

The annual subduction rate in the South Indian Ocean was calculated by analyzing Simple Ocean Data Assimilation （SODA） outputs in the period of 1950-2008. The subduction rate census for potential density classes showed a peak corresponding to Indian Ocean subtropical mode water （IOSTMW） in the southwestern part of the South Indian Ocean subtropical gyre. The deeper mixed layer depth, the sharper mixed-layer fronts and the associated relatively faster circulation in the present climatology resulted in a larger lateral induction, which primarily dominants the IOSTMW subduction rate, while with only minor contribution from vertical pumping. Without loss of generality, through careful analysis of the water characteristics in the layer of minimum vertical temperature gradient （LMVTG）, the authors suggest that the IOSTMW was identified as a thermostad, with a lateral minimum of low potential vorticity （PV, less than 200× 10^-12 m^-1·s^-1） and a low dT/dz （less than 1.5℃/（100 m））. The IOSTMW within the South Indian Ocean subtropical gyre distributed in the region approximately from 25° to 50° E and from 30° to 39°S. Additionally, the average characteristics （temperature, salinity, potential density） of the mode water were estimated about （16.38 ± 0.29）℃, （35.46 ±0.04）, （26.02 ±0.04） ae over the past 60 years.

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