Field observations on water temperature and stratification in a seasonally ice-covered shallow thermokarst lake

被引：0
|
作者：
Huang W. [1 ,2 ]
Han H. [3 ]
Niu F. [2 ]
Li Z. [3 ]
机构：
[1] School of Environmental Science and Engineering, Chang'an University, Xi'an
[2] State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou
[3] State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian
来源：
Shuikexue Jinzhan/Advances in Water Science | 2016年 / 27卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Lake ice; Qinghai-Tibet Plateau; Thermal stratification; Thermokarst lake; Water temperature;
D O I：
10.14042/j.cnki.32.1309.2016.02.013
中图分类号：
学科分类号：
摘要：
In order to better understand the thermodynamic characteristics of seasonally ice-covered shallow lake, the ice freezing and melting processes, water/ice temperature variation, as well as meteorological conditions were measured in a typical thermokarst lake in central Qinghai-Tibet Plateau from October 2010 until July 2013. The temporal variations of lake temperature, development of thermocline, and the effects of lake ice on lake water thermal structure were investigated. Results indicated that a significant surface sublimation/ablation took place over the entire ice season. The daily and seasonal vertical structures of the lake temperature are significantly dominated by the change of air temperature, surface radiative fluxes, wind speed, ice thermodynamics, and heat fluxes from the lake bottom sediment. During the cycle of "ice free-freezing onset-ice growing-melting onset-melting ice breakoff-ice free", the lake temperature takes up an annual cycle of "stratification-overturning-inversion stratification-inversion-normal stratification-overturning-stratification". The thermal stratification consists only of epilimnion (mixing layer) and thermocline. Both layers can be replaced by a strong mixing process caused by strong gusts. Thus, compared with large lakes, the seasonal ice-covered shallow lakes have quite different thermodynamic characteristics. © 2016, Science Press. All right reserved.
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页码：280 / 289
页数：9
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