Double-diffusive fluxes of salt and heat in the upper layer of north pacific intermediate water

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• 作者：Yuzhu You (1) (2)
  
• 关键词：double ; diffusion ; salt ; fingering ; double ; diffusive fluxes of heat and salt ; water ; mass Turner angle ; NPIW ; North Pacific
• 刊名：Journal of Ocean University of China
• 出版年：2005
• 出版时间：January 2005
• 年：2005
• 卷：4
• 期：1
• 页码：1-7
• 全文大小：3673KB
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• 作者单位：Yuzhu You (1) (2)
  
  1. The University of Sydney Institute of Marine Science (USIMS), University of Sydney, Edgeworth David Building F05, 2006, NSW, Australia
  2. Physical Oceanography Laboratory, Ocean University of China, 266003, Qingdao, P.R.China
  
• ISSN：1993-5021

文摘

Almost half of the oceanic water columns exhibit double-diffusion. The importance of double-diffusion in global oceans-salt and heat fluxes, water-mass formation and mixing, and circulation is increasingly recognized. However, such an important physical process in the ocean has not been well studied. One of the reasons is the difficulty of parameterizing and quantifying the processes. The paper presented here attempts to quantify the double-diffusive fluxes of salt and heat in the ocean. Previous qualitative analysis by applying the water-mass Turner angle, mTu, to the North Pacific Intermediate Water (NPIW) layer showed a favorable condition for salt-fingering in the upper NPIW due to the overlying warm/salty water above the cold/fresh NPIW core, and a doubly-stable condition in the lower NPIW where potential temperature decreases with depth while salinity increases, inducing double stratification with respect to both potential temperature and salinity. The present study gives a quantitative estimate of double-diffusive fluxes of salt and heat contributed by salt-fingering in the upper NPIW layer.