Direct measurements of episodic snow accumulation on the Antarctic polar plateau
This is the published version, also available here: http://dx.doi.org/10.1029/2000JD900099. During a 1-year field experiment at a remote location on the Antarctic polar plateau (85.67°S, 46.38°W) influenced by moderate magnitude katabatic winds, snow accumulation was characterized at three different...
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Online Access: | http://hdl.handle.net/1808/15758 https://doi.org/10.1029/2000JD900099 |
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ftunivkansas:oai:kuscholarworks.ku.edu:1808/15758 2023-05-15T13:32:09+02:00 Direct measurements of episodic snow accumulation on the Antarctic polar plateau Braaten, David A. 2014-11-14T19:41:31Z http://hdl.handle.net/1808/15758 https://doi.org/10.1029/2000JD900099 unknown Wiley Braaten, D. A. (2000), Direct measurements of episodic snow accumulation on the Antarctic polar plateau, J. Geophys. Res., 105(D8), 10119–10128, http://dx.doi.org/10.1029/2000JD900099. http://hdl.handle.net/1808/15758 doi:10.1029/2000JD900099 openAccess Meteorology and atmospheric dynamics: instruments and techniques Meteorology and atmospheric dynamics: mesoscale meteorology Meteorology and atmospheric dynamics: polar meteorology Meteorology and atmospheric dynamics: precipitation Article 2014 ftunivkansas https://doi.org/10.1029/2000JD900099 2022-08-26T13:15:37Z This is the published version, also available here: http://dx.doi.org/10.1029/2000JD900099. During a 1-year field experiment at a remote location on the Antarctic polar plateau (85.67°S, 46.38°W) influenced by moderate magnitude katabatic winds, snow accumulation was characterized at three different spatial and temporal scales using snow stakes, tracer material dispersed periodically on the snow surface, and an acoustic depth gauge. The spatial variability of snow accumulation was found to be large, on both annual and intra-annual timescales, and is attributed to the high frequency of moderate to strong winds at the site. Accumulation throughout the year was observed to be episodic in nature, with a small number of snow accumulation events producing the majority of the annual total accumulation for the site, averaging 0.174 m. In the intervals between observed accumulation events (up to several months), negative changes to snow surface height caused by sublimation and densification of the firn were quantified using an acoustic depth gauge. The rate of decrease in snow surface elevation was largest during the austral summer, as expected, and the overall change in snow surface elevation due to sublimation/densification during the year was estimated to be about −0.10 m. Using the precise timing of accumulation events provided by the acoustic depth gauge, meteorological surface observations, numerical model analyses, and satellite imagery were used to gain insights into whether the event was associated with precipitation or related exclusively to blowing snow and to diagnose the meteorological conditions producing the event. Meteorological conditions during the accumulation events were found to strongly support an association with precipitation events caused by mesoscale or synoptic-scale cyclones along the coastal margin. Dating of the accumulation profile using the dispersed tracer technique identified several other accumulation events that were not measured within the target area of the acoustic depth gauge, ... Article in Journal/Newspaper Antarc* Antarctic The University of Kansas: KU ScholarWorks Antarctic Austral Polar Plateau ENVELOPE(0.000,0.000,-90.000,-90.000) The Antarctic Journal of Geophysical Research: Atmospheres 105 D8 10119 10128 |
institution |
Open Polar |
collection |
The University of Kansas: KU ScholarWorks |
op_collection_id |
ftunivkansas |
language |
unknown |
topic |
Meteorology and atmospheric dynamics: instruments and techniques Meteorology and atmospheric dynamics: mesoscale meteorology Meteorology and atmospheric dynamics: polar meteorology Meteorology and atmospheric dynamics: precipitation |
spellingShingle |
Meteorology and atmospheric dynamics: instruments and techniques Meteorology and atmospheric dynamics: mesoscale meteorology Meteorology and atmospheric dynamics: polar meteorology Meteorology and atmospheric dynamics: precipitation Braaten, David A. Direct measurements of episodic snow accumulation on the Antarctic polar plateau |
topic_facet |
Meteorology and atmospheric dynamics: instruments and techniques Meteorology and atmospheric dynamics: mesoscale meteorology Meteorology and atmospheric dynamics: polar meteorology Meteorology and atmospheric dynamics: precipitation |
description |
This is the published version, also available here: http://dx.doi.org/10.1029/2000JD900099. During a 1-year field experiment at a remote location on the Antarctic polar plateau (85.67°S, 46.38°W) influenced by moderate magnitude katabatic winds, snow accumulation was characterized at three different spatial and temporal scales using snow stakes, tracer material dispersed periodically on the snow surface, and an acoustic depth gauge. The spatial variability of snow accumulation was found to be large, on both annual and intra-annual timescales, and is attributed to the high frequency of moderate to strong winds at the site. Accumulation throughout the year was observed to be episodic in nature, with a small number of snow accumulation events producing the majority of the annual total accumulation for the site, averaging 0.174 m. In the intervals between observed accumulation events (up to several months), negative changes to snow surface height caused by sublimation and densification of the firn were quantified using an acoustic depth gauge. The rate of decrease in snow surface elevation was largest during the austral summer, as expected, and the overall change in snow surface elevation due to sublimation/densification during the year was estimated to be about −0.10 m. Using the precise timing of accumulation events provided by the acoustic depth gauge, meteorological surface observations, numerical model analyses, and satellite imagery were used to gain insights into whether the event was associated with precipitation or related exclusively to blowing snow and to diagnose the meteorological conditions producing the event. Meteorological conditions during the accumulation events were found to strongly support an association with precipitation events caused by mesoscale or synoptic-scale cyclones along the coastal margin. Dating of the accumulation profile using the dispersed tracer technique identified several other accumulation events that were not measured within the target area of the acoustic depth gauge, ... |
format |
Article in Journal/Newspaper |
author |
Braaten, David A. |
author_facet |
Braaten, David A. |
author_sort |
Braaten, David A. |
title |
Direct measurements of episodic snow accumulation on the Antarctic polar plateau |
title_short |
Direct measurements of episodic snow accumulation on the Antarctic polar plateau |
title_full |
Direct measurements of episodic snow accumulation on the Antarctic polar plateau |
title_fullStr |
Direct measurements of episodic snow accumulation on the Antarctic polar plateau |
title_full_unstemmed |
Direct measurements of episodic snow accumulation on the Antarctic polar plateau |
title_sort |
direct measurements of episodic snow accumulation on the antarctic polar plateau |
publisher |
Wiley |
publishDate |
2014 |
url |
http://hdl.handle.net/1808/15758 https://doi.org/10.1029/2000JD900099 |
long_lat |
ENVELOPE(0.000,0.000,-90.000,-90.000) |
geographic |
Antarctic Austral Polar Plateau The Antarctic |
geographic_facet |
Antarctic Austral Polar Plateau The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Braaten, D. A. (2000), Direct measurements of episodic snow accumulation on the Antarctic polar plateau, J. Geophys. Res., 105(D8), 10119–10128, http://dx.doi.org/10.1029/2000JD900099. http://hdl.handle.net/1808/15758 doi:10.1029/2000JD900099 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1029/2000JD900099 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
105 |
container_issue |
D8 |
container_start_page |
10119 |
op_container_end_page |
10128 |
_version_ |
1766024568461328384 |