气候变化领域集成服务门户(CCPortal): Sentinel-Based Inventory of Thermokarst Lakes and Ponds Across Permafrost Landscapes on the Qinghai-Tibet Plateau

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DOI	10.1029/2021EA001950
	Sentinel-Based Inventory of Thermokarst Lakes and Ponds Across Permafrost Landscapes on the Qinghai-Tibet Plateau
	Wei, Zhiqiang; Du, Zhiheng; Wang, Lei; Lin, Jiahui; Feng, Yaru; Xu, Qian; Xiao, Cunde
通讯作者	Xiao, CD (通讯作者)，Beijing Normal Univ, State Key Lab Earth Surface Processes & Resource, Beijing, Peoples R China.
发表日期	2021
EISSN	2333-5084
卷号	8 期号:11
英文摘要	Thermokarst lakes and ponds (hereafter referred to as thaw lakes) play an important role in the permafrost regions by regulating hydrology, ecology, and biogeochemistry. However, detailed quantitative information on thaw lake extent and distribution remains poorly resolved across the entire permafrost regions on the Qinghai-Tibet Plateau (QTP). Here, we applied the random forest (RF) model and manual visual vectorization methods to extract thaw lake boundaries on the QTP based on Sentinel-2 images. Accuracy assessment was comprehensively demonstrated regarding the inherent spatial resolution of imagery and RF model performance. The results showed that the accumulated uncertainty of the total thaw lake area was +/- 5.75 km(2), and the mean accuracy (91.9%) from field-measured boundaries of 132 thaw lakes supported the accuracy of this inventory. A total of similar to 161,300 thaw lakes with sizes ranging from 500 m(2) to 3 km(2) were detected, with a total area of similar to 2,825.45 +/- 5.75 km(2). Most thaw lakes were detected in the continuous permafrost type (94.1%) and within the elevations of 4,500-5,000 m (68.4%). The small thaw lakes (<10,000 m(2)) predominated the total lake number (78.9%) but contributed to a small portion of the total lake area (12.7%). Spatial distributions of thaw lakes in terms of different climatic and environmental conditions were also comprehensively explored, including temperature, precipitation, ground thermal stability, active layer thickness, vegetation, soil properties, and underground ice content. This inventory is expected to be incorporated into Earth system models for a more comprehensive projection of the large-scale biogeochemical feedback of thermokarst landforms on the QTP under continued global warming. Plain Language Summary Thaw lakes develop when warming soil melts ground ice, causing the surface to collapse and form pools of water. Such lakes can greatly influence local water resources and ecosystems, but also are important sources of greenhouse gas released into the atmosphere. Using Sentinel-2 images, we provided robust information of thaw lake numbers, areas, and spatial distributions across the entire QTP permafrost regions by applying the random forest model and manual visual vectorization methods. The accuracy of the data set has been demonstrated in regard to the image spatial resolution, model performance, and field-measured results. Within sizes ranging from 500 m(2) to 3 km(2), we extracted similar to 161,300 thaw lakes with a total area of similar to 2,825.45 +/- 5.75 km(2). We found that most thaw lakes were located in the continuous permafrost regions and within the elevations of 4,500-5,000 m. Most thaw lake sizes were smaller than 10,000 m(2) but they only contributed to a little percentage of the total lake area. We also comprehensively explored the spatial distributions of thaw lakes in different climatic and environmental areas. This inventory would be useful for future Earth system models to predict the large-scale biogeochemical feedback of thaw lakes on the Qinghai-Tibet Plateau in the future.
关键词	RANDOM FOREST CLASSIFIER LAND-COVER SURFACE-WATER WARMING PERMAFROST CROPLAND EXTENT CLIMATE-CHANGE TIME-SERIES CARBON STOCKS REGION
语种	英语
WOS研究方向	Astronomy & Astrophysics ; Geology
WOS类目	Astronomy & Astrophysics ; Geosciences, Multidisciplinary
WOS记录号	WOS:000722485800019
来源期刊	EARTH AND SPACE SCIENCE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254939
作者单位	[Wei, Zhiqiang] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Zhuhai Branch, Zhuhai, Peoples R China; [Du, Zhiheng; Xu, Qian] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou, Peoples R China; [Wang, Lei; Lin, Jiahui; Feng, Yaru; Xiao, Cunde] Beijing Normal Univ, State Key Lab Earth Surface Processes & Resource, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wei, Zhiqiang,Du, Zhiheng,Wang, Lei,et al. Sentinel-Based Inventory of Thermokarst Lakes and Ponds Across Permafrost Landscapes on the Qinghai-Tibet Plateau[J]. 中国科学院西北生态环境资源研究院,2021,8(11).
APA	Wei, Zhiqiang.,Du, Zhiheng.,Wang, Lei.,Lin, Jiahui.,Feng, Yaru.,...&Xiao, Cunde.(2021).Sentinel-Based Inventory of Thermokarst Lakes and Ponds Across Permafrost Landscapes on the Qinghai-Tibet Plateau.EARTH AND SPACE SCIENCE,8(11).
MLA	Wei, Zhiqiang,et al."Sentinel-Based Inventory of Thermokarst Lakes and Ponds Across Permafrost Landscapes on the Qinghai-Tibet Plateau".EARTH AND SPACE SCIENCE 8.11(2021).