http://reply.papertrans.cn/2/171/17059/17059-11.png
http://reply.papertrans.cn/2/171/17059/17059-12.png
http://reply.papertrans.cn/2/171/17059/17059-13.png
http://reply.papertrans.cn/2/171/17059/17059-14.png
http://reply.papertrans.cn/2/171/17059/17059-15.png
Submitted on: 15 August 2000.
Revised on: 05 October 2000.
Accepted on: 03 December 2000.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
http://reply.papertrans.cn/2/171/17059/17059-17.png
Submitted on: 27 May 1998.
Revised on: 20 September 1998.
Accepted on: 23 October 1998.
___________________JOURNAL OF GLACIOLOGY---CAMBRIDGE UNIV PRESS
http://reply.papertrans.cn/2/171/17059/17059-19.png
http://reply.papertrans.cn/2/171/17059/17059-20.png