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2010年马卡罗夫海盆冰站观测期间垂向热通量时间变化研究
引用本文:郭桂军,史久新,矫玉田.2010年马卡罗夫海盆冰站观测期间垂向热通量时间变化研究[J].海洋学报(英文版),2015,34(11):118-125.
作者姓名:郭桂军  史久新  矫玉田
作者单位:中国海洋大学 海洋环境学院, 山东 青岛 266100;中国海洋大学 教育部物理海洋重点实验室, 山东 青岛 266003,中国海洋大学 海洋环境学院, 山东 青岛 266100;中国海洋大学 教育部物理海洋重点实验室, 山东 青岛 266003,中国海洋大学 海洋环境学院, 山东 青岛 266100;中国海洋大学 教育部物理海洋重点实验室, 山东 青岛 266003
基金项目:The Global Change Research Program of China under contract No. 2015CB953902; the National Natural Science Foundation of China under contract Nos 41330960 and 40976111.
摘    要:Based on hydrographic data obtained at an ice camp deployed in the Makarov Basin by the 4th Chinese Arctic Research Expedition in August of 2010, temporal variability of vertical heat flux in the upper ocean of the Makarov Basin is investigated together with its impacts on sea ice melt and evolution of heat content in the remnant of winter mixed layer(r WML). The upper ocean of the Makarov Basin under sea ice is vertically stratified. Oceanic heat flux from mixed layer(ML) to ice evolves in three stages as a response to air temperature changes, fluctuating from 12.4 W/m2 to the maximum 43.6 W/m2. The heat transferred upward from ML can support(0.7±0.3) cm/d ice melt rate on average, and daily variability of melt rate agrees well with the observed results. Downward heat flux from ML across the base of ML is much less, only 0.87 W/m2, due to enhanced stratification in the seasonal halocline under ML caused by sea ice melt, indicating that increasing solar heat entering summer ML is mainly used to melt sea ice, with a small proportion transferred downward and stored in the r WML. Heat flux from ML into r WML changes in two phases caused by abrupt air cooling with a day lag. Meanwhile, upward heat flux from Atlantic water(AW) across the base of r WML, even though obstructed by the cold halocline layer(CHL), reaches0.18 W/m2 on average with no obvious changing pattern and is also trapped by the r WML. Upward heat flux from deep AW is higher than generally supposed value near 0, as the existence of r WML enlarges the temperature gradient between surface water and CHL. Acting as a reservoir of heat transferred from both ML and AW, the increasing heat content of r WML can delay the onset of sea ice freezing.

关 键 词:海冰  热通量  冬季混合层残留水  热含量  马卡罗夫海盆
收稿时间:6/2/2014 12:00:00 AM
修稿时间:2015/6/11 0:00:00

Temporal variability of vertical heat flux in the Makarov Basin during the ice camp observation in summer 2010
GUO Guijun,SHI Jiuxin and JIAO Yutian.Temporal variability of vertical heat flux in the Makarov Basin during the ice camp observation in summer 2010[J].Acta Oceanologica Sinica,2015,34(11):118-125.
Authors:GUO Guijun  SHI Jiuxin and JIAO Yutian
Institution:College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;Key Laboratory of Physical Oceanography, Ministry of Education, Qingdao 266003, China
Abstract:Based on hydrographic data obtained at an ice camp deployed in the Makarov Basin by the 4th Chinese Arctic Research Expedition in August of 2010, temporal variability of vertical heat flux in the upper ocean of the Makarov Basin is investigated together with its impacts on sea ice melt and evolution of heat content in the remnant of winter mixed layer (rWML). The upper ocean of the Makarov Basin under sea ice is vertically stratified. Oceanic heat flux from mixed layer (ML) to ice evolves in three stages as a response to air temperature changes, fluctuating from 12.4 W/m2 to the maximum 43.6 W/m2. The heat transferred upward from ML can support (0.7±0.3) cm/d ice melt rate on average, and daily variability of melt rate agrees well with the observed results. Downward heat flux from ML across the base of ML is much less, only 0.87 W/m2, due to enhanced stratification in the seasonal halocline under ML caused by sea ice melt, indicating that increasing solar heat entering summer ML is mainly used to melt sea ice, with a small proportion transferred downward and stored in the rWML. Heat flux from ML into rWML changes in two phases caused by abrupt air cooling with a day lag. Meanwhile, upward heat flux from Atlantic water (AW) across the base of rWML, even though obstructed by the cold halocline layer (CHL), reaches 0.18 W/m2 on average with no obvious changing pattern and is also trapped by the rWML. Upward heat flux from deep AW is higher than generally supposed value near 0, as the existence of rWML enlarges the temperature gradient between surface water and CHL. Acting as a reservoir of heat transferred from both ML and AW, the increasing heat content of rWML can delay the onset of sea ice freezing.
Keywords:sea ice  heat flux  remnant of winter mixed layer  heat content  Makarov Basin
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