| 加拿大海盆深层双扩散对流的观测分析 |
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| 引用本文： | 谢玲玲,李明明,李敏.加拿大海盆深层双扩散对流的观测分析[J].海洋学报(英文版),2015,34(11):71-79. |
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| 作者姓名： | 谢玲玲 李明明 李敏 |
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| 作者单位： | 1 广东省近海海洋变化与灾害预警重点实验室(GLOD), 广东海洋大学, 湛江, 524088,1 广东省近海海洋变化与灾害预警重点实验室(GLOD), 广东海洋大学, 湛江, 524088,1 广东省近海海洋变化与灾害预警重点实验室(GLOD), 广东海洋大学, 湛江, 524088 |
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| 基金项目： | 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. |
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| 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 lower1 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 doublediffusive convection in deep CB. The interface of the stairs is about 10 m thick with 0.001–0.002°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/m2, which is one-two orders smaller than the upper double-diffusive heat flux,but comparable to the estimates of geothermal heat flux.
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| 关 键 词： | 双扩散 加拿大海盆 阶梯结构 热通量 水团 |
| 收稿时间： | 2015/3/19 0:00:00 |
| 修稿时间： | 7/4/2015 12:00:00 AM |
Observational analysis of the double-diffusive convection in the deep Canada Basin |
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| XIE Lingling,LI Mingming and LI Min.Observational analysis of the double-diffusive convection in the deep Canada Basin[J].Acta Oceanologica Sinica,2015,34(11):71-79. |
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| Authors: | XIE Lingling LI Mingming and LI Min |
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| Institution: | Guangdong Province Key Laboratory for Coastal Ocean Variation and Disaster Prediction (GLOD), Guangdong Ocean University, Zhanjiang 524088, China |
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| Abstract: | 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. |
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| Keywords: | double diffusion Canada Basin staircase heat flux water mass |
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