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Submitted on: 01 August 2001.
Revised on: 23 August 2001.
Accepted on: 03 September 2001.
___________________Earths Future---AMER GEOPHYSICAL UNION
Submitted on: 03 January 2020.
Revised on: 01 April 2020.
Accepted on: 01 May 2020.
___________________Earths Future---AMER GEOPHYSICAL UNION
Submitted on: 10 September 2009.
Revised on: 14 November 2009.
Accepted on: 03 January 2010.
___________________Earths Future---AMER GEOPHYSICAL UNION
Submitted on: 16 June 1998.
Revised on: 27 July 1998.
Accepted on: 16 August 1998.
___________________Earths Future---AMER GEOPHYSICAL UNION