气候变化领域集成服务门户(CCPortal): Seasonal trends and cycles of lake-level variations over the Tibetan Plateau using multi-sensor altimetry data

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DOI	10.1016/j.jhydrol.2021.127251
	Seasonal trends and cycles of lake-level variations over the Tibetan Plateau using multi-sensor altimetry data
	Xu, Fenglin; Zhang, Guoqing; Yi, Shuang; Chen, Wenfeng
通讯作者	Zhang, GQ (通讯作者)
发表日期	2022
ISSN	0022-1694
EISSN	1879-2707
卷号	604
英文摘要	The large number of lakes, little influenced by humans, on the Tibetan Plateau, form a natural laboratory for exploring cryosphere-hydrosphere-atmosphere processes under global warming. The water levels of these alpine lakes respond directly to water balance, but are mainly known only on the interannual scale. Seasonal variations are still poorly described due to limited gauge measurements. Here, the seasonal trends and cycles of lake-level changes on the Tibetan Plateau were examined using altimetry data from ICESat (132 available lakes), Cryosat-2 (244 lakes), Sentinel-3A (125 lakes), Sentinel-3B (120 lakes), and ICESat-2 (356 lakes). Bias between altimetry data sets was removed, and a validation against in-situ lake-level measurements from Qinghai Lake between 2003 and 2020 revealed a good performance (R-2 > 0.80, RMSE < 0.12 m). The mean annual trend of lake level between 2003 and 2020 is 0.20 +/- 0.01 m/yr, with similar rates (0.18-0.20 m/yr) in three different seasons. The rate was slightly greater (0.22 +/- 0.02 m/yr) between 2010 and 2020, but seasonal trends were again similar in this period (0.21-0.25 m/yr). Declining water levels for lakes around Nam Co were identified, with a mean negative rate of -0.09 +/- 0.02 m/yr. Furthermore, during 2016-2020, an accelerated lake-level rise was found, with a mean rate of 0.43 +/- 0.05 m/yr (0.47-0.53 m/yr in four seasons). Lake levels in the southern TP are shown to have increased during 2016-2019: a reversal of the pre-2016 observations of declining levels. The seasonal cycles of lake-level variations show that the majority of lakes have a peak water level in August-September, followed by October-November. The features of the peaks vary distinctly in different climate regions, with the timing of the peak occurring gradually later as one moves from southwest to northeast. The seasonal cycles of water level and terrestrial water storage from GRACE data are highly consistent. The spatial pattern of lake-level changes during the seasonal period of rising lake levels also matches precipitation variations well, as does lake volume change with terrestrial water storage budget. The study reveals the tremendous potential of multi-sensor altimetry data for detecting seasonal features of lake-level variation, which is a great asset for understanding Earth's water dynamics and balance.
关键词	WATER-LEVEL SARIN MODE SRTM DEM ICE CRYOSAT ROBUST QINGHAI CHINA LAND MASS
英文关键词	Seasonal lake level; Radar and laser altimetry; Cryosat-2; Sentinel-3; ICESat-2; Tibetan Plateau
语种	英语
WOS研究方向	Engineering ; Geology ; Water Resources
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:000752020500001
来源期刊	JOURNAL OF HYDROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260619
推荐引用方式 GB/T 7714	Xu, Fenglin,Zhang, Guoqing,Yi, Shuang,et al. Seasonal trends and cycles of lake-level variations over the Tibetan Plateau using multi-sensor altimetry data[J]. 中国科学院青藏高原研究所,2022,604.
APA	Xu, Fenglin,Zhang, Guoqing,Yi, Shuang,&Chen, Wenfeng.(2022).Seasonal trends and cycles of lake-level variations over the Tibetan Plateau using multi-sensor altimetry data.JOURNAL OF HYDROLOGY,604.
MLA	Xu, Fenglin,et al."Seasonal trends and cycles of lake-level variations over the Tibetan Plateau using multi-sensor altimetry data".JOURNAL OF HYDROLOGY 604(2022).