Submitted on: 15 June 1999.
Revised on: 26 September 1999.
Accepted on: 25 November 1999.
___________________Earths Future---AMER GEOPHYSICAL UNION
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Submitted on: 10 January 2019.
Revised on: 26 March 2019.
Accepted on: 22 May 2019.
___________________Earths Future---AMER GEOPHYSICAL UNION
Submitted on: 16 June 2014.
Revised on: 08 October 2014.
Accepted on: 08 November 2014.
___________________Earths Future---AMER GEOPHYSICAL UNION
Submitted on: 27 October 2010.
Revised on: 23 January 2011.
Accepted on: 15 March 2011.
___________________Earths Future---AMER GEOPHYSICAL UNION
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