Submitted on: 03 October 2000.
Revised on: 21 November 2000.
Accepted on: 23 December 2000.
___________________Cryosphere---COPERNICUS GESELLSCHAFT MBH
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Submitted on: 23 April 2020.
Revised on: 30 July 2020.
Accepted on: 19 August 2020.
___________________Cryosphere---COPERNICUS GESELLSCHAFT MBH
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