文献类型：期刊文献

中文题名：Observational analysis of the double-diffusive convection in the deep Canada Basin

英文题名：Observational analysis of the double-diffusive convection in the deep Canada Basin

作者：Xie Lingling[1];Li Mingming[1];Li Min[1]

机构：[1]Guangdong Ocean Univ, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang 524088, Peoples R China

年份：2015

卷号：34

期号：11

起止页码：71

中文期刊名：Acta Oceanologica Sinica

外文期刊名：ACTA OCEANOLOGICA SINICA

收录：SCI-EXPANDED(收录号：WOS:000362919700010)、CSTPCD、、CSCD2015_2016、Scopus(收录号：2-s2.0-84946109668)、WOS、CSCD

基金：The National Natural Science Foundation of China under contract Nos 41476009, 41106012 and 41506018; the Science and Technology Program in Higher Education of Guangdong under contract No. 2013KJCX0099.

语种：英文

中文关键词：double diffusion;Canada Basin;staircase;heat flux;water mass

外文关键词：double diffusion; Canada Basin; staircase; heat flux; water mass

中文摘要：The Canada Basin （CB） is the largest sub-basin in the Arctic, with the deepest abyssal plain of 3 850 m. The double-diffusive process is the possible passage through which the geothermal energy affects the above isolated deep waters. With the temperature-salinity-pressure observations in 2003, 500-m-thick transition layers and lower 1 000-m-thick bottom homogenous layers were found below 2 400 m in the central deep CB. Staircases with downward-increasing temperature and salinity are prominent in the transition layers, suggesting the double- diffusive convection in deep CB. The interface of the stairs is about 10 m thick with 0.001-0.002℃ temperature difference, while the thicknesses of the homogenous layers in the steps decrease upward from about 60 to 20 m. The density ratio in the deep central CB is generally smaller than 2, indicating stronger double-diffusive convection than that in the upper ocean of 200-400 m. The heat flux through the deepest staircases in the deep CB varies between 0.014 and 0.031 W/m2, which is one-two orders smaller than the upper double-diffusive heat flux, but comparable to the estimates of geothermal heat flux.

外文摘要：The Canada Basin (CB) is the largest sub-basin in the Arctic, with the deepest abyssal plain of 3 850 m. The double-diffusive process is the possible passage through which the geothermal energy affects the above isolated deep waters. With the temperature-salinity-pressure observations in 2003, 500-m-thick transition layers and lower 1 000-m-thick bottom homogenous layers were found below 2 400 m in the central deep CB. Staircases with downward-increasing temperature and salinity are prominent in the transition layers, suggesting the double-diffusive convection in deep CB. The interface of the stairs is about 10 m thick with 0.001-0.002 degrees C temperature difference, while the thicknesses of the homogenous layers in the steps decrease upward from about 60 to 20 m. The density ratio in the deep central CB is generally smaller than 2, indicating stronger double-diffusive convection than that in the upper ocean of 200-400 m. The heat flux through the deepest staircases in the deep CB varies between 0.014 and 0.031 W/m(2), which is one-two orders smaller than the upper double-diffusive heat flux, but comparable to the estimates of geothermal heat flux.