Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica
Early–mid Pliocene moraines in the McMurdo Dry Valleys, Antarctica, are more extensive than the present alpine glaciers in this region, indicating substantial climatic differences between the early–mid Pliocene and the present. To quantify this difference in the glacier–climate regime, we estimated...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.429.6089 2023-05-15T13:42:51+02:00 Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica A. G. Krusic M. L. Prentice J. M. Licciardi The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.429.6089 http://www.igsoc.org/annals/50/50/a50a089.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.429.6089 http://www.igsoc.org/annals/50/50/a50a089.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.igsoc.org/annals/50/50/a50a089.pdf text ftciteseerx 2016-01-08T04:31:56Z Early–mid Pliocene moraines in the McMurdo Dry Valleys, Antarctica, are more extensive than the present alpine glaciers in this region, indicating substantial climatic differences between the early–mid Pliocene and the present. To quantify this difference in the glacier–climate regime, we estimated the equilibrium-line altitude (ELA) change since the early–mid Pliocene by calculating the modern ELA and reconstructing the ELAs of four alpine glaciers in Wright and Taylor Valleys at their early–mid Pliocene maxima. The area–altitude balance ratio method was used on modern and reconstructed early–mid Pliocene hypsometry. In Wright and Victoria Valleys, mass-balance data identify present-day ELAs of 800–1600 m a.s.l. and an average balance ratio of 1.1. The estimated ELAs of the much larger early–mid Pliocene glaciers in Wright and Taylor Valleys range from 600 to 950 � 170 m a.s.l., and thus are 250–600 � 170 m lower than modern ELAs in these valleys. The depressed ELAs during the early–mid-Pliocene most likely indicate a wetter and therefore warmer climate in the Dry Valleys during this period than previous studies have recognized. Text Antarc* Antarctica McMurdo Dry Valleys Unknown Ela ENVELOPE(9.642,9.642,63.170,63.170) McMurdo Dry Valleys |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Early–mid Pliocene moraines in the McMurdo Dry Valleys, Antarctica, are more extensive than the present alpine glaciers in this region, indicating substantial climatic differences between the early–mid Pliocene and the present. To quantify this difference in the glacier–climate regime, we estimated the equilibrium-line altitude (ELA) change since the early–mid Pliocene by calculating the modern ELA and reconstructing the ELAs of four alpine glaciers in Wright and Taylor Valleys at their early–mid Pliocene maxima. The area–altitude balance ratio method was used on modern and reconstructed early–mid Pliocene hypsometry. In Wright and Victoria Valleys, mass-balance data identify present-day ELAs of 800–1600 m a.s.l. and an average balance ratio of 1.1. The estimated ELAs of the much larger early–mid Pliocene glaciers in Wright and Taylor Valleys range from 600 to 950 � 170 m a.s.l., and thus are 250–600 � 170 m lower than modern ELAs in these valleys. The depressed ELAs during the early–mid-Pliocene most likely indicate a wetter and therefore warmer climate in the Dry Valleys during this period than previous studies have recognized. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
A. G. Krusic M. L. Prentice J. M. Licciardi |
spellingShingle |
A. G. Krusic M. L. Prentice J. M. Licciardi Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica |
author_facet |
A. G. Krusic M. L. Prentice J. M. Licciardi |
author_sort |
A. G. Krusic |
title |
Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica |
title_short |
Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica |
title_full |
Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica |
title_fullStr |
Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica |
title_full_unstemmed |
Climatic implications of reconstructed early–mid Pliocene equilibrium-line altitudes in the McMurdo Dry Valleys, Antarctica |
title_sort |
climatic implications of reconstructed early–mid pliocene equilibrium-line altitudes in the mcmurdo dry valleys, antarctica |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.429.6089 http://www.igsoc.org/annals/50/50/a50a089.pdf |
long_lat |
ENVELOPE(9.642,9.642,63.170,63.170) |
geographic |
Ela McMurdo Dry Valleys |
geographic_facet |
Ela McMurdo Dry Valleys |
genre |
Antarc* Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys |
op_source |
http://www.igsoc.org/annals/50/50/a50a089.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.429.6089 http://www.igsoc.org/annals/50/50/a50a089.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766173339251900416 |