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Submitted on: 29 June 2009.
Revised on: 24 August 2009.
Accepted on: 09 October 2009.
___________________Biogeosciences---COPERNICUS GESELLSCHAFT MBH
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Submitted on: 08 July 2001.
Revised on: 01 October 2001.
Accepted on: 14 October 2001.
___________________Biogeosciences---COPERNICUS GESELLSCHAFT MBH