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Comparison of Typical Alpine Lake Surface Elevation Variations and Different Driving Forces by Remote Sensing
Yaming Pan1, Weibing Du1,2,3, Dandan Ma1
1School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo 454003, China.
International Journal of Environmental Research and Public Health
|December 23, 2022
Summary
Central Asian alpine lakes
Area of Science:
- Hydrology and Earth Observation
Background:
- Alpine lakes are crucial for watershed ecology, water resources, and biodiversity in Central Asia.
- Understanding their dynamics is vital for regional water management and conservation.
Purpose of the Study:
- To validate the CryoSat-2 satellite altimetry dataset for monitoring Central Asian alpine lake surface elevations.
- To establish lake surface elevation time series and analyze hydrological drivers for Karakul and Chatyrkul lakes.
Main Methods:
- Validated CryoSat-2 footprints altimetry data against Hydroweb for Lake Bosten and Lake Issyk-Kul.
- Established lake surface elevation time series using altimetry data for Karakul and Chatyrkul.
- Analyzed lake basin meteorological data from remote sensing to identify hydrological drivers.
Main Results:
- CryoSat-2 data demonstrated high accuracy for lake surface elevation monitoring, with strong agreement (0.96 and 0.84) with Hydroweb.
- Lake Karakul's surface elevation increased by 7.7 cm/yr (2010-2020), correlated with rising basin temperatures and increased meltwater.
- Lake Chatyrkul's surface elevation decreased by 9.9 cm/yr (2010-2020), negatively correlated with temperature, indicating increased evaporation.
Conclusions:
- CryoSat-2 is a reliable tool for monitoring alpine lake surface elevations in Central Asia.
- Temperature-driven changes in snow/ice meltwater and evaporation significantly impact alpine lake dynamics.
- Alpine glacial variability and temperature are key drivers of lake surface elevation changes in the region.
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