Daily lake ice extent and cover proportion dataset of the Tibetan Plateau based on MODIS (2002-2018)


There are many lakes on the Tibetan Plateau. The phenology and duration of lake ice age in this area is very sensitive to regional and global climate change, so it is used as a key indicator of climate change research, especially the comparative study of environmental changes in the Earth's three poles. However, due to its harsh natural environment and sparse population, it lacked routine field measurements of lake ice phenology. Using the Moderate-resolution Imaging Spectroradiometer (MODIS) to normalize the Different Snow Index (NDSI) data, the lake ice was monitored at a resolution of 500 meters to fill the observation gap. The traditional snow map algorithm was used to detect the daily ice volume and coverage extent of lakes under sunny condition. The spatial and temporal continuity of lake surface conditions was applied to re-determine the daily ice volume and coverage extent of lakes under cloud cover condition through a series of steps. Time series analysis was performed on 308 lakes larger than 3 k㎡ to determine effective record of lake ice extent and coverage, then to form a daily lake ice extent and coverage data set. And furthermore, four lake ice phenological parameters: freeze-up start ( FUS), freeze-up end (FUE), break-up start (BUS), and break-up end (BUE) can be obtained from 216 lakes of the data set, and two parameters: FUS and BUE can be obtained from the other 92 lakes.


Data file naming and use method

The data set contains 5,834 raster files, 1 vector file, and 308 Excel files. The raster files were named "Daily Lake Ice Extent." The vector file contains information such as the number, names, location, surface area, and classification codes of the processed lakes. The names of the excel files were corresponded to the lake numbers. Each excel file contains 6 columns and information on the daily ice coverage of the corresponding lakes from July 2002 to June 2018. The attributes of each column are: succession, date, lake coverage, lake ice coverage, cloud coverage, lake coverage, and lake ice coverage after cloud processing. Users can use vector files to determine the quantity, location and classification of a given lake first, and then get the corresponding Excel file of daily lake ice coverage data of a given year to monitor the lake ice freeze-thaw and study climate change.


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Cite as:

QIU Yubao. Daily lake ice extent and cover proportion dataset of the Tibetan Plateau based on MODIS (2002-2018). National Tibetan Plateau Data Center, 2019. doi: 10.11922/sciencedb.744. (Download the reference: RIS | Bibtex )

Using this data, the data citation is required to be referenced and the related literatures are suggested to be cited.


Support Program

CASEarth:Big Earth Data for Three Poles(grant No. XDA19070000) (No:XDA19000000)

Pan-Third Pole Environment Study for a Green Silk Road-A CAS Strategic Priority A Program (No:XDA20000000)

User Limit

To respect the intellectual property rights, protect the rights of data authors,expand servglacials of the data center, and evaluate the application potential of data, data users should clearly indicate the source of the data and the author of the data in the research results generated by using the data (including published papers, articles, data products, and unpublished research reports, data products and other results). For re-posting (second or multiple releases) data, the author must also indicate the source of the original data.

Example of acknowledgement statement is included below: The data set is provided by National Tibetan Plateau Data Center (http://data.tpdc.ac.cn).


License: This work is licensed under an Attribution 4.0 International (CC BY 4.0)


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Keywords
Geographic coverage
East: 105.00 West: 62.00
South: 26.00 North: 46.00
Detail
  • Temporal resolution: Daily
  • Spatial resolution: m
  • File size: 404 MB
  • Browse count: 947 Times
  • Apply count: 17 Times
  • Share mode: online
  • Temporal coverage: 2002-07-09 To 2018-06-28
  • Updated time: 2019-07-30
Contact Information
: QIU Yubao  

Distributor: National Tibetan Plateau Data Center

Email: data@itpcas.ac.cn

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