Submitted on: 20 June 2002.
Revised on: 16 July 2002.
Accepted on: 12 September 2002.
___________________Earth Systems and Environment---SPRINGER INT PUBL AG
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Submitted on: 25 June 2003.
Revised on: 04 August 2003.
Accepted on: 29 August 2003.
___________________Earth Systems and Environment---SPRINGER INT PUBL AG
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Submitted on: 25 March 2015.
Revised on: 09 July 2015.
Accepted on: 31 July 2015.
___________________Earth Systems and Environment---SPRINGER INT PUBL AG