Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada
Dissertation (Ph.D.) University of Alaska Fairbanks, 2007 The Bering and the Malaspina Glacier systems of south-central Alaska, U.S.A., and southwest Yukon Territory, Canada, in the Saint Elias Mountains constitute the two largest temperate surge-type piedmont glaciers on Earth. This is largest regi...
Main Author: | |
---|---|
Other Authors: | |
Format: | Doctoral or Postdoctoral Thesis |
Language: | unknown |
Published: |
2007
|
Subjects: | |
Online Access: | http://hdl.handle.net/11122/8933 |
id |
ftunivalaska:oai:scholarworks.alaska.edu:11122/8933 |
---|---|
record_format |
openpolar |
spelling |
ftunivalaska:oai:scholarworks.alaska.edu:11122/8933 2023-05-15T16:20:20+02:00 Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada Muskett, Reginald R. Lingle, Craig 2007 http://hdl.handle.net/11122/8933 unknown http://hdl.handle.net/11122/8933 Department of Geology and Geophysics Geophysics Geographic information science and geodesy Remote sensing Dissertation phd 2007 ftunivalaska 2023-02-23T21:37:09Z Dissertation (Ph.D.) University of Alaska Fairbanks, 2007 The Bering and the Malaspina Glacier systems of south-central Alaska, U.S.A., and southwest Yukon Territory, Canada, in the Saint Elias Mountains constitute the two largest temperate surge-type piedmont glaciers on Earth. This is largest region of glaciers and icefields in continental North America. Determining and understanding the causes of wastage of these two glaciers is important to understanding the linkages of glacier mass balance to climate change, glacier dynamics, and the contributions of the glaciers of northwestern North America to rising sea level. Presented are the first detailed estimate of the net mass balances of the Bering and Malaspina Glacier systems, the effects of glacier dynamics on their accumulation areas, and the wastage of the tidewater glaciers of Icy Bay. The combined wastage of the Bering and Malaspina Glacier systems from 1972 to 2003, 254 +/- 16 km 3 water equivalent over a glacier area of 7734 km2, is equivalent to an area-average mass balance of -1.06 +/- 0.07 m/y over that time period. This represents a contribution to global sea-level rise of 0.70 +/- 0.05 mm, 0.023 +/- 0.002 mm/yr from 1972 to 2003. This is roughly 0.8% of the modern sea-level rise as estimated from tide-gauges and satellites, and roughly 9% of the contribution from non-polar glaciers and ice caps. Glacier wastage has been caused by climate warming (negative mass balance) superimposed on the effects of glacier dynamics. Near-concurrent surge of the three largest glaciers of the Malaspina Glacier piedmont were observed during 1999 to 2002. In addition, the tidewater Tyndall Glacier, whose retreat since 1910 was interrupted in 1964 by a major surge, also surged during 1999 to 2002. These four surges have occurred roughly 23 years after the 1976/77 shift of the Pacific Decadal Oscillation to its current warm-wet phase. Despite the increase of high-elevation snow accumulation observed on Mt. Logan, the accumulation areas of the Bering and Malaspina ... Doctoral or Postdoctoral Thesis glacier glacier* glaciers Tidewater Alaska Yukon University of Alaska: ScholarWorks@UA Canada Fairbanks Pacific Yukon |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
unknown |
topic |
Geophysics Geographic information science and geodesy Remote sensing |
spellingShingle |
Geophysics Geographic information science and geodesy Remote sensing Muskett, Reginald R. Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada |
topic_facet |
Geophysics Geographic information science and geodesy Remote sensing |
description |
Dissertation (Ph.D.) University of Alaska Fairbanks, 2007 The Bering and the Malaspina Glacier systems of south-central Alaska, U.S.A., and southwest Yukon Territory, Canada, in the Saint Elias Mountains constitute the two largest temperate surge-type piedmont glaciers on Earth. This is largest region of glaciers and icefields in continental North America. Determining and understanding the causes of wastage of these two glaciers is important to understanding the linkages of glacier mass balance to climate change, glacier dynamics, and the contributions of the glaciers of northwestern North America to rising sea level. Presented are the first detailed estimate of the net mass balances of the Bering and Malaspina Glacier systems, the effects of glacier dynamics on their accumulation areas, and the wastage of the tidewater glaciers of Icy Bay. The combined wastage of the Bering and Malaspina Glacier systems from 1972 to 2003, 254 +/- 16 km 3 water equivalent over a glacier area of 7734 km2, is equivalent to an area-average mass balance of -1.06 +/- 0.07 m/y over that time period. This represents a contribution to global sea-level rise of 0.70 +/- 0.05 mm, 0.023 +/- 0.002 mm/yr from 1972 to 2003. This is roughly 0.8% of the modern sea-level rise as estimated from tide-gauges and satellites, and roughly 9% of the contribution from non-polar glaciers and ice caps. Glacier wastage has been caused by climate warming (negative mass balance) superimposed on the effects of glacier dynamics. Near-concurrent surge of the three largest glaciers of the Malaspina Glacier piedmont were observed during 1999 to 2002. In addition, the tidewater Tyndall Glacier, whose retreat since 1910 was interrupted in 1964 by a major surge, also surged during 1999 to 2002. These four surges have occurred roughly 23 years after the 1976/77 shift of the Pacific Decadal Oscillation to its current warm-wet phase. Despite the increase of high-elevation snow accumulation observed on Mt. Logan, the accumulation areas of the Bering and Malaspina ... |
author2 |
Lingle, Craig |
format |
Doctoral or Postdoctoral Thesis |
author |
Muskett, Reginald R. |
author_facet |
Muskett, Reginald R. |
author_sort |
Muskett, Reginald R. |
title |
Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada |
title_short |
Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada |
title_full |
Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada |
title_fullStr |
Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada |
title_full_unstemmed |
Mass Balances And Dynamic Changes Of The Bering, Malaspina, And Icy Bay Glacier Systems Of Alaska, United States, And Yukon, Canada |
title_sort |
mass balances and dynamic changes of the bering, malaspina, and icy bay glacier systems of alaska, united states, and yukon, canada |
publishDate |
2007 |
url |
http://hdl.handle.net/11122/8933 |
geographic |
Canada Fairbanks Pacific Yukon |
geographic_facet |
Canada Fairbanks Pacific Yukon |
genre |
glacier glacier* glaciers Tidewater Alaska Yukon |
genre_facet |
glacier glacier* glaciers Tidewater Alaska Yukon |
op_relation |
http://hdl.handle.net/11122/8933 Department of Geology and Geophysics |
_version_ |
1766008240626204672 |