Институт водных проблем Севера КарНЦ РАН

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Jinrong Zhang, Wenfeng Huang, Zheng Zhang, Miao Yu Zhijun Li, Zhanju Lin

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The characteristics of solar radiation transmission in frozen lakes are affected by different snow thickness
Jinrong Zhang, Wenfeng Huang, Zheng Zhang, Miao Yu Zhijun Li, Zhanju Lin

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Tables 4 and 5 present the water temperature, but what temperature the authors had in view: averaged, in the nearest layer under the ice, …? It seems worthy to clarify, especially in the context of Table 3, where the dissolved oxygen profiles are presented. 

Sergey Bogdanov
Northern Water Problems Institute Karelian Research Centre of RAS

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This is a very interesting study. Questions: Tables 2 and 5 show the dissolved oxygen and temperature values corresponding to different thicknesses of snow on ice. What is meant? Is there different thickness of snow on the ice in different areas of the lake? Or a different thickness of snow in different months of winter? How can the presence of snow on ice contribute to a decrease in oxygen and temperature?

Galina Zdorovennova
Northern Water Problems Institute Karelian Research Centre of RAS

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In the process of field observation, The data of dissolved oxygen was measured every 20cm in the whole subglacial water, and the temperature was chosen as the water temperature 20cm from the bottom of the ice.Snow thickness varies from area to area on the surface of the lake.Ice/falling snow blocking the exchange of water and atmospheric oxygen, and falling snow will to a great extent, restricted access to water radiant flux, the thickness of the snow layers increases, the amount of radiation flux into the water will be reduced, when the thickness of the layers is 3.5 cm or more, the radiation flux into the ice water almost to 0, preventing algae and other aquatic plants photosynthesis, and the lake ecological system of biological respiration consumes oxygen, this leads to the reduce of oxygen in water body.In addition, solar radiation heats water, and the presence of ice/snow limits solar radiation entering the water, which greatly affects water temperature.

Jinrong Zhang
Key Laboratory of Underground Hydrology and Ecological Effects, Chang 'an University

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(1) We selected the solar-noon periods under clear skies from Dec 19 to 22, 2019 for filed observations. The dissolved oxygen was measured every 20 cm within the under-ice water column, and the water temperature was measured at 20cm depth from the bottom of the ice. All these DO and temperature data were measured single-time at the optical observation sites. Snow accumulation was spatially different, i.e. stripped/ spotted snow cover due to wind blowing. So snow thickness varied from area to area on the surface of the lake.

HUANG, Wenfeng
School of Water and Environment, Chang'an University

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