ABSTRACT. Persistent katabatic winds form widely distributed localized areas of near-zero net surface accumulation on the East Antarctic ice sheet (EAIS) plateau. These areas have been called ‘glaze’ surfaces due to their polished appearance. They are typically 2–200 km 2 in area and are found on le...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.391.9222 2023-05-15T13:48:49+02:00 T. Neumann M. Albert J. -g. Winther The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.9222 http://www.mers.byu.edu/long/papers/JGlac2012_GlazeExtent.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.9222 http://www.mers.byu.edu/long/papers/JGlac2012_GlazeExtent.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.mers.byu.edu/long/papers/JGlac2012_GlazeExtent.pdf text ftciteseerx 2016-01-08T02:17:49Z ABSTRACT. Persistent katabatic winds form widely distributed localized areas of near-zero net surface accumulation on the East Antarctic ice sheet (EAIS) plateau. These areas have been called ‘glaze’ surfaces due to their polished appearance. They are typically 2–200 km 2 in area and are found on leeward slopes of ice-sheet undulations and megadunes. Adjacent, leeward high-accumulation regions (isolated dunes) are generally smaller and do not compensate for the local low in surface mass balance (SMB). We use a combination of satellite remote sensing and field-gathered datasets to map the extent of wind glaze in the EAIS above 1500 m elevation. Mapping criteria are derived from distinctive surface and subsurface characteristics of glaze areas resulting from many years of intense annual temperature cycling without significant burial. Our results show that 11.2 � 1.7%, or 950 � 143 � 10 3 km 2, of the EAIS above 1500 m is wind glaze. Studies of SMB interpolate values across glaze regions, leading to overestimates of net mass input. Using our derived wind-glaze extent, we estimate this excess in three recent models of Antarctic SMB at 46–82 Gt. The lowest-input model appears to best match the mean in regions of extensive wind glaze. Text Antarc* Antarctic Ice Sheet Unknown Antarctic East Antarctic Ice Sheet |
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ftciteseerx |
language |
English |
description |
ABSTRACT. Persistent katabatic winds form widely distributed localized areas of near-zero net surface accumulation on the East Antarctic ice sheet (EAIS) plateau. These areas have been called ‘glaze’ surfaces due to their polished appearance. They are typically 2–200 km 2 in area and are found on leeward slopes of ice-sheet undulations and megadunes. Adjacent, leeward high-accumulation regions (isolated dunes) are generally smaller and do not compensate for the local low in surface mass balance (SMB). We use a combination of satellite remote sensing and field-gathered datasets to map the extent of wind glaze in the EAIS above 1500 m elevation. Mapping criteria are derived from distinctive surface and subsurface characteristics of glaze areas resulting from many years of intense annual temperature cycling without significant burial. Our results show that 11.2 � 1.7%, or 950 � 143 � 10 3 km 2, of the EAIS above 1500 m is wind glaze. Studies of SMB interpolate values across glaze regions, leading to overestimates of net mass input. Using our derived wind-glaze extent, we estimate this excess in three recent models of Antarctic SMB at 46–82 Gt. The lowest-input model appears to best match the mean in regions of extensive wind glaze. |
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The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
T. Neumann M. Albert J. -g. Winther |
spellingShingle |
T. Neumann M. Albert J. -g. Winther |
author_facet |
T. Neumann M. Albert J. -g. Winther |
author_sort |
T. Neumann |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.9222 http://www.mers.byu.edu/long/papers/JGlac2012_GlazeExtent.pdf |
geographic |
Antarctic East Antarctic Ice Sheet |
geographic_facet |
Antarctic East Antarctic Ice Sheet |
genre |
Antarc* Antarctic Ice Sheet |
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Antarc* Antarctic Ice Sheet |
op_source |
http://www.mers.byu.edu/long/papers/JGlac2012_GlazeExtent.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.391.9222 http://www.mers.byu.edu/long/papers/JGlac2012_GlazeExtent.pdf |
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