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Submitted on: 29 January 2010.
Revised on: 28 March 2010.
Accepted on: 09 May 2010.
___________________Biogeosciences---COPERNICUS GESELLSCHAFT MBH
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Submitted on: 05 February 2007.
Revised on: 09 March 2007.
Accepted on: 29 March 2007.
___________________Biogeosciences---COPERNICUS GESELLSCHAFT MBH
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