Thermokarst lakes on the Qinghai-Tibet Plateau - National Cryosphere Desert Data Center

English name

Thermokarst lakes on the Qinghai-Tibet Plateau

CSTR

CSTR:11738.11.ncdc.NIEER.2021.1688

DOI

10.12072/ncdc.LZU.db0001.2021

Share type

Online

Category

Frozen soil

source site

Platform service center

contributors

Chen Xu , Mu Cuicui , Jia Lin , Li Zhilong , Fan Chengyan , Mu Mei , Peng xiaoqing , Wu Xiaodong

Datasets description

The Qinghai-Tibetan Plateau (QTP), the largest high-altitude and low-latitude permafrost zone in the world, has experienced rapid permafrost degradation in recent decades, and one of the most remarkable resulting characteristics is the formation of thermokarst lakes. Such lakes have attracted significant attention because of their ability to regulate carbon cycle, water, and energy fluxes. However, the distribution of thermokarst lakes in this area remains largely unknown, hindering our understanding of the response of permafrost and its carbon feedback to climate change.Based on more than 200 sentinel-2A images and combined with ArcGIS, NDWI and Google Earth Engine platform, this data set extracted the boundary of thermokarst lakes in permafrost regions of the Qinghai-Tibet Plateau through GEE automatic extraction and manual visual interpretation.In 2018, there were 121758 thermokarst lakes in the permafrost area of the Qinghai-Tibet Plateau, covering an area of 0.0004-0.5km2, with a total area of 1,730.34km respectively.The cataloging data set of Thermokarst Lakes provides basic data for water resources evaluation, permafrost degradation evaluation and thermal karst study on the Qinghai-Tibet Plateau.

Name of Data QTP_thermokarst_lake_2018.shp
Data description of attribute items
GLAKE_ID: The coding of thermokarst Lake GL_Area: The area of thermokarst lake (m2) GL_Long: The longitude of center point of the thermokarst lakes (°) GL_Lati: The latitude of center point of the thermokarst lakes (°)

Base information

collect time	2018/04/01 - 2018/12/31
collect place	Permafrost area of the Qinghai-Tibet Plateau
altitude	1357.0m - 6247.0m
data size	110.3 MiB
data format	shp
Coordinate system	WGS84

Data source description

"1. Sentinel-2A Images Download from the websites of the United States Geological Survey (https://www.usgs.gov/). 2. Permafrost data Zou, D., Lin, Z., Yu, S., Ji, C., Cheng, G., 2017. A New Map of the Permafrost Distribution on the Tibetan Plateau. Chinese Pharmaceutical Affairs 11, 1-28. 3. SRTM Shuttle Radar Topography Mission digital elevation model with spatial resolution of 1″download from the website http://imagico.de/map/demsearch.php. "

Data processing method

Pre-processing of Remote Sensing Data： False Colour Compositing of Landsat Image
Extracting the preliminary lake extent： Using NDWI based on NIR and Green bands, each image of the entire QTP region is automatically extracted by GEE.. formula: NDWI=(B_GREEN-B_NIR)/(B_GREEN+B_NIR ) Reference：Mcfeeters, S. K.: The use of the Normalized Difference Water Index (NDWI) in the delineation of open water features, Int. J. Remote Sens., 17(7), 1425-1432, doi: 10.1080/01431169608948714, 1996.
Manual Vectorization and Entering of Attribute Data The artificial vectorization of all water bodies on the Qinghai-Tibet Plateau has been used to remove non-thermal melting lake water bodies such as rivers, glaciers and glacial lakes, and the self-extracted thermal melting lake water bodies have been checked.
Interactive Checking and Accuracy Control Thermokarst lakes were discerned via human–computer interaction; The UAV imagery was used as an important auxiliary reference data source for error examination."

Data quality description

"Accuracy of Data： (1) Since the Sentinel-2A data resolution is 10 meters and the Sentinel-2A data is suitable for extracting water over 350 square meters, the resolution of the hot melt ponds data set is 10m.
(2)The error calculation results show that in 2018, the relative area error of the catalog data set of thermokarst lakes is between 0 and 0.5."

Project information

#	number	name	type
1	41871050		National Natural Science Foundation of China
2	SKLFSE201705		other
3	2019YFA0607003		National Key Technology Research and Development Program of theMinistry of Science and Technology of China

Citations and annotations

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For the achievements published in English, please refer to the following specifications： The dataset is provided by National Cryosphere Desert Data Center. (http://www.ncdc.ac.cn).

Data reference

Chen Xu, Mu Cuicui, Jia Lin, Li Zhilong, Fan Chengyan, Mu Mei, Peng xiaoqing, Wu Xiaodong. Thermokarst lakes on the Qinghai-Tibet Plateau. National Cryosphere Desert Data Center(http://www.ncdc.ac.cn), 2020. https://cstr.cn/CSTR:11738.11.ncdc.NIEER.2021.1688.
Chen Xu, Mu Cuicui, Jia Lin, Li Zhilong, Fan Chengyan, Mu Mei, Peng xiaoqing, Wu Xiaodong. Thermokarst lakes on the Qinghai-Tibet Plateau. National Cryosphere Desert Data Center(http://www.ncdc.ac.cn), 2020. https://www.doi.org/10.12072/ncdc.LZU.db0001.2021.

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license agreement

This work is licensed under a Creative Commons Attribution 4.0 International License.

Relevant data
File list

#	Dataset title
1	A new permafrost distribution map over the Qinghai-Tibet Plateau for 2010
2
3	Meteorological Observation Data of Wudaoliang on the Qinghai Tibet Plateau in 2006
4	Ground temperature data of kunlunshanyakou, Qinghai Tibet Plateau, 2003-2006
5	Daily geothermal data of chumar River (qtb05) in Qinghai Tibet Plateau from 2005 to 2006
6	Ground temperature data of Xidatan pumping station (qtb01) in Qinghai Tibet Plateau from 2004 to 2006
7	Annual ground temperature data of the chumaher River (QTB05) in the Qinghai Tibet Plateau from 2005 to 2010
8
9	Ground temperature data of the great bridge in Hoh Xil (qtb06) of the Qinghai Tibet Plateau in 2006
10	Annual average ground temperature data of kunlunshanyakou (qtb02) in the Qinghai Tibet Plateau from 2003 to 2010

#	title	file size
1	QTP_thermokarst_lake_2018.rar	40.4 MiB
2	QTP_thermokarst_lake_2018

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Theme:
Climate change permafrost degradation Qinghai-Tibetan Plateau thermokarst lakes
Subject:
Earth Science
Time:
2018
Place:
Permafrost area of the Qinghai-Tibet Plateau

east 105.00

west 73.50

south 26.00

north 40.00

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Service information

contacts:: Li Hongxing
phone:: 0931-4967592
mailbox:: ncdc@lzb.ac.cn

Contact information

contributors:: Chen Xu , Mu Cuicui , Jia Lin , Li Zhilong , Fan Chengyan , Mu Mei , Peng xiaoqing , Wu Xiaodong
author:: Chen Xu , Mu Cuicui
manager:: Chen Xu