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Variations of Lake Ice Phenology on the Tibetan Plateau From 2001 to 2017 Based on MODIS Data
Cai, Yu Ke, ChangâQing Li, Xingong Zhang, Guoqing Duan, Zheng Lee, Hoonyol
Cai, Yu
Ke, ChangâQing
Li, Xingong
Zhang, Guoqing
Duan, Zheng
Lee, Hoonyol
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Abstract
Lake ice is a robust indicator of climate change. The availability of information contained in Moderate Resolution Imaging Spectroradiometer daily snow products from 2000 to 2017 could be greatly improved after cloud removal by gap filling. Thresholds based on open water pixel numbers are used to extract the freezeup start and breakup end dates for 58 lakes on the Tibetan Plateau (TP); 18 lakes are also selected to extract the freezeup end and breakup start dates. The lake ice durations are further calculated based on freezeup and breakup dates. Lakes on the TP begin to freezeup in late October and all the lakes start the ice cover period in midâJanuary of the following year. In late March, some lakes begin to break up, and all the lakes end the ice cover period in early July. Generally, the lakes in the northern InnerâTP have earlier freezeup dates and later breakup dates (i.e., longer ice cover durations) than those in the southern InnerâTP. Over 17 years, the mean ice cover duration of 58 lakes is 157.78 days, 18 (31%) lakes have a mean extending rate of 1.11 day/year, and 40 (69%) lakes have a mean shortening rate of 0.80 day/year. Geographical location and climate conditions determine the spatial heterogeneity of the lake ice phenology, especially the ones of breakup dates, while the physicoâchemical characteristics mainly affect the freezeup dates of the lake ice in this study. Ice cover duration is affected by both climatic and lake specific physicoâchemical factors, which can reflect the climatic and environmental change for lakes on the TP.
Description
An edited version of this paper was published by AGU. Copyright 2019 American Geophysical Union.
Date
2019-01-02
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Wiley
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Keywords
Lake ice phenology, Freezeup/breakup dates, Climate change, MODIS, Tibetan Plateau
Citation
Cai, Y., Ke, C.âQ., Li, X., Zhang, G., Duan, Z., & Lee, H. (2019). Variations of lake ice phenology on the Tibetan Plateau from 2001 to 2017 based on MODIS data. Journal of Geophysical Research: Atmospheres, 124, 825â 843. https://doi.org/10.1029/2018JD028993