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Lake dynamics in Tibetan Plateau during 1990-2020 and exploratory factor analyses using Google Earth Engine
Zhiyuan Li1, Fan Deng2, Jie Gong3
1School of Geosciences, Yangtze University, Wuhan, 430100, China.
Environmental Science and Pollution Research International
|January 12, 2023
Summary
Tibetan Plateau lakes have significantly increased in size over 30 years, particularly in the Qiangtang Basin. Lake dynamics are influenced by temperature and precipitation, varying by river basin.
Area of Science:
- Hydrology
- Remote Sensing
- Climate Change Science
Background:
- Tibetan Plateau (TP) lakes are vital water resources and sensitive indicators of climate change.
- Understanding TP lake dynamics is crucial due to regional climate sensitivity and diverse geographical features.
Purpose of the Study:
- To analyze the spatial-temporal dynamics of TP lakes from 1990 to 2020.
- To investigate the influence of climate variables on lake dynamics across different river basins.
Main Methods:
- Utilized Landsat imagery from 1990-2020.
- Employed Google Earth Engine for lake mapping and analysis.
- Examined lake dynamics from a river basin perspective.
Main Results:
- TP lake number and area increased significantly over 30 years, with notable exceptions (1990-1995, 2013-2015).
- Endorheic basins, especially the Qiangtang Basin, showed substantial lake area growth (approx. 30%).
- Outflow basins exhibited stable lake areas; climate influence varied by basin (e.g., precipitation in Amu Dayra/Yellow, temperature in Hexi).
Conclusions:
- TP lake area has generally expanded over the past three decades.
- Climate variables, primarily temperature and precipitation, significantly impact lake dynamics, with basin-specific variations.
- Provides a comprehensive reference for long-term lake dynamics research in the TP.
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