Институт водных проблем Севера КарНЦ РАН

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XIE Fei, LU Peng, CAO Xiao-wei, WANG Qing-kai, LI Zhi-jun

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Study on the evolution process of lake ice and related influencing factors in northeast China
XIE Fei, LU Peng, CAO Xiao-wei, WANG Qing-kai, LI Zhi-jun

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Very interesting study, indeed. And a lot of inspiring questions too:
- Do (and how deeply, if any) the underwater currents contribute to the melting rate? Only the hint is presented in the paper, via the correlation between the stratification depth and ice thickness decreasing. 
- As for the hysteresis effect: What are the factors governing the lag time (a few hours)? Does this effect hold for thicker (more than 17 cm) ice? 
- Is it possible to analyze the correlation between ice thickness and “positive degree-days”, during the period after achieving the maximum thickness? Or, in other words is it possible to amplify Fig. 1a with the melting curve? Would the correlation survive?

Sergey Bogdanov
Northern Water Problems Institute Karelian Research Centre of RAS
02.09.2020

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Very interesting! Snow-covered lake ice is indeed very important.

Ilya Chernov
 Karelian Research Centre of RAS
02.09.2020

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Fei Xie
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology
03.09.2020

Dear Sergey Bogdanov: Thank you for your questions, my answers are as follows: -The underwater currents contributed to the attenuation of lake ice. The open water gradually extended from east to west(February 25) and contacted with wind and solar radiation directly, causing more solar radiation to enter lakes to accelerate the melting of lake ice. -The main factors controlling the lag time were ice surface characteristics and ice thickness. The depth of ice thickness affected by this effect was not absolute, but relative. The lag effect of ice layer near air was stronger, and that of ice layer near water was weaker -We have already tried to use the "positive degree-days" to calculate the ice thickness decay process, but the result was not good. There was no significant correlation between air temperature and the decay of ice thickness. Hope to have the opportunity to exchange the lake ice research in the future. My email address: xf_ice@mail.dlut.edu.cn

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Fei Xie
State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology
03.09.2020

Dear Ilya Chernov: Thank you very much for your attention to our work. Exploring the evolution and distribution of snow on the lake ice surface is also one of our planned work next winter, which is essential to calculate the energy balance of the whole lake ice. Hope to have a chance to discuss together in the future. My email address: xf_ice@mail.dlut.edu.cn.

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