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Analysis of Ice Phenology of Lakes on the Tibetan Plateau from Modis Data : Volume 6, Issue 3 (21/05/2012)

By Kropáček, J.

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Book Id: WPLBN0004022670
Format Type: PDF Article :
File Size: Pages 41
Reproduction Date: 2015

Title: Analysis of Ice Phenology of Lakes on the Tibetan Plateau from Modis Data : Volume 6, Issue 3 (21/05/2012)  
Author: Kropáček, J.
Volume: Vol. 6, Issue 3
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Hochschild, V., Chen, F., Hoerz, S., & Kropáček, J. (2012). Analysis of Ice Phenology of Lakes on the Tibetan Plateau from Modis Data : Volume 6, Issue 3 (21/05/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute for Cartography, Dresden University of Technology, Helmholzstr. 10, 01069 Dresden, Germany. Much attention has recently been paid to the impact of climate change at the Tibetan Plateau. This remote and harsh region includes a large system of endorheic (closed basin) lakes. Ice phenology i.e. the timing of freeze-up and break-up and the duration of the ice cover may provide valuable information about climate variations in this region. The ice phenology of 59 large lakes on the Tibetan Plateau was derived from Moderate Resolution Imaging Spectroradiometer (MODIS) 8-day composite data for the period from 2001 to 2010. Duration of the ice cover appears to have a high variability in the studied region due to both climate and local factors. Mean values for the duration of ice cover were calculated for four groups of lakes defined as distinct geographic regions. In each group several lakes showed anomalies in ice cover duration in the studied period. Possible reasons for such anomalous behavior are discussed. Furthermore, many lakes do not freeze up completely during some seasons. This was confirmed by inspection of high resolution optical data. Mild winter seasons, large water volume and/or high salinity are the most likely explanations. Trends in the ice cover duration derived by linear regression for all the studied lakes show a high variation in space. A correlation of ice phenology variables with parameters describing climatic and local conditions showed a high thermal dependency of the ice regime. It appears that the freeze onset and water clean of ice day appear to be more thermally determined than freeze-up and break-up dates in case of the studied lakes.

Summary
Analysis of ice phenology of lakes on the Tibetan Plateau from MODIS data

Excerpt
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