气候变化领域集成服务门户(CCPortal): Seasonal cycles of lakes on the Tibetan Plateau detected by Sentinel-1 SAR data

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DOI	10.1016/j.scitotenv.2019.135563
	Seasonal cycles of lakes on the Tibetan Plateau detected by Sentinel-1 SAR data
	Zhang, Yu; Zhang, Guoqing; Zhu, Tingting
通讯作者	Zhang, GQ (通讯作者)
发表日期	2020
ISSN	0048-9697
EISSN	1879-1026
卷号	703
英文摘要	The long-term evolution of lakes on the Tibetan Plateau (TP) could be observed from Landsat series of satellite data since the 1970s. However, the seasonal cycles of lakes on the TP have received little attention due to high cloud contamination of the commonly-used optical images. In this study, for the first time, the seasonal cycle of lakes on the TP was detected using Sentinel-1 Synthetic Aperture Radar (SAR) data with a high repeat cycle. A total of approximately 6000 Level-1 scenes were obtained that covered all large lakes (>50 km(2)) in the study area. The images were extracted from stripmap (SM) and interferometric wide swath (IW) modes that had a pixel spacing of 40 m in the range and azimuth directions. The lake boundaries extracted from Sentinel-1 data using the algorithm developed in this study were in good agreement with in-situ measurements of lake shoreline, lake outlines delineated from the corresponding Landsat images in 2015 and lake levels for Qinghai Lake. Upon analysis, it was found that the seasonal cycles of lakes exhibited drastically different patterns across the TP. For example, large size lakes (>100 km(2)) reached their peaks in August-September while lakes with areas of 50-100 km(2) reached their peaks in early June-July. The peaks of seasonal cycles for endorheic lakes were more pronounced than those for exorheic lakes with flat peaks, and glacier-fed lakes with additional supplies of water exhibited delayed peaks in their seasonal cycles relative to those of non-glacier-fed lakes. Large-scale atmospheric circulation systems, such as the westerlies, Indian summer monsoon, transition in between, and East Asian summer monsoon, were also found to affect the seasonal cycles of lakes. The results of this study suggest that Sentinel-1 SAR data are a powerful tool that can be used to fill gaps in intra-annual lake observations. (c) 2019 Elsevier B.V. All rights reserved.
关键词	RADAR ALTIMETER RA-2 IN-SITU MEASUREMENTS ICE PHENOLOGY WATER PRECIPITATION DYNAMICS VOLUME MASS EXPANSION IMAGES
英文关键词	Intra-annual lake mapping; Endorheic lake; Glacier-fed lake; Large-scale atmospheric circulation
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000505924300158
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
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/259756
推荐引用方式 GB/T 7714	Zhang, Yu,Zhang, Guoqing,Zhu, Tingting. Seasonal cycles of lakes on the Tibetan Plateau detected by Sentinel-1 SAR data[J]. 中国科学院青藏高原研究所,2020,703.
APA	Zhang, Yu,Zhang, Guoqing,&Zhu, Tingting.(2020).Seasonal cycles of lakes on the Tibetan Plateau detected by Sentinel-1 SAR data.SCIENCE OF THE TOTAL ENVIRONMENT,703.
MLA	Zhang, Yu,et al."Seasonal cycles of lakes on the Tibetan Plateau detected by Sentinel-1 SAR data".SCIENCE OF THE TOTAL ENVIRONMENT 703(2020).