Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica
We present an improved method for estimating accumulationand compaction rates of dry snow in Antarcticawith ground penetrating radar (GPR). Using an estimate ofthe emitted waveform from direct measurements, we applydeterministic deconvolution via the Fourier domain to GPRdata with a nominal frequenc...
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ftunivtasecite:oai:ecite.utas.edu.au:77810 2023-05-15T13:42:40+02:00 Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica Kruetzmann, NC Rack, W McDonald, AJ George, SE 2011 application/pdf https://doi.org/10.5194/tc-5-391-2011 http://ecite.utas.edu.au/77810 en eng Copernicus Publications http://ecite.utas.edu.au/77810/1/Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica.pdf http://dx.doi.org/10.5194/tc-5-391-2011 Kruetzmann, NC and Rack, W and McDonald, AJ and George, SE, Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica, The Cryosphere, 5, (2) pp. 391-404. ISSN 1994-0416 (2011) [Refereed Article] http://ecite.utas.edu.au/77810 Earth Sciences Climate change science Climatology Refereed Article PeerReviewed 2011 ftunivtasecite https://doi.org/10.5194/tc-5-391-2011 2022-08-29T22:16:46Z We present an improved method for estimating accumulationand compaction rates of dry snow in Antarcticawith ground penetrating radar (GPR). Using an estimate ofthe emitted waveform from direct measurements, we applydeterministic deconvolution via the Fourier domain to GPRdata with a nominal frequency of 500 MHz. This revealsunambiguous reflection horizons which can be observed inrepeat measurements made one year apart. At two measurementsites near Scott Base, Antarctica, we extrapolatepoint measurements of average accumulation from snow pitsand firn cores to a larger area by identifying a dateable dustlayer horizon in the radargrams. Over an 800mx800m areaon the McMurdo Ice Shelf (77degree45' S, 167degree17' E) the averageaccumulation is found to be 269+-9 kgm-2 a-1. Theaccumulation over an area of 400mx400m on Ross Island(77degree40' S, 167degree11' E, 350ma.s.l.) is found to be higher(404+-22 kgm-2 a-1) and shows increased variability relatedto undulating terrain. Compaction of snow between2m and 13m depth is estimated at both sites by trackingseveral internal reflection horizons along the radar profilesand calculating the average change in separation of horizonpairs from one year to the next. The derived compaction ratesrange from 7 cmm-1 at a depth of 2 m, down to no measurablecompaction at 13m depth, and are similar to publishedvalues from point measurements. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf McMurdo Ice Shelf Ross Island The Cryosphere eCite UTAS (University of Tasmania) McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) Ross Island Scott Base ENVELOPE(166.766,166.766,-77.849,-77.849) The Cryosphere 5 2 391 404 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Climate change science Climatology |
spellingShingle |
Earth Sciences Climate change science Climatology Kruetzmann, NC Rack, W McDonald, AJ George, SE Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica |
topic_facet |
Earth Sciences Climate change science Climatology |
description |
We present an improved method for estimating accumulationand compaction rates of dry snow in Antarcticawith ground penetrating radar (GPR). Using an estimate ofthe emitted waveform from direct measurements, we applydeterministic deconvolution via the Fourier domain to GPRdata with a nominal frequency of 500 MHz. This revealsunambiguous reflection horizons which can be observed inrepeat measurements made one year apart. At two measurementsites near Scott Base, Antarctica, we extrapolatepoint measurements of average accumulation from snow pitsand firn cores to a larger area by identifying a dateable dustlayer horizon in the radargrams. Over an 800mx800m areaon the McMurdo Ice Shelf (77degree45' S, 167degree17' E) the averageaccumulation is found to be 269+-9 kgm-2 a-1. Theaccumulation over an area of 400mx400m on Ross Island(77degree40' S, 167degree11' E, 350ma.s.l.) is found to be higher(404+-22 kgm-2 a-1) and shows increased variability relatedto undulating terrain. Compaction of snow between2m and 13m depth is estimated at both sites by trackingseveral internal reflection horizons along the radar profilesand calculating the average change in separation of horizonpairs from one year to the next. The derived compaction ratesrange from 7 cmm-1 at a depth of 2 m, down to no measurablecompaction at 13m depth, and are similar to publishedvalues from point measurements. |
format |
Article in Journal/Newspaper |
author |
Kruetzmann, NC Rack, W McDonald, AJ George, SE |
author_facet |
Kruetzmann, NC Rack, W McDonald, AJ George, SE |
author_sort |
Kruetzmann, NC |
title |
Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica |
title_short |
Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica |
title_full |
Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica |
title_fullStr |
Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica |
title_full_unstemmed |
Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica |
title_sort |
snow accumulation and compaction derived from gpr data near ross island, antarctica |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/tc-5-391-2011 http://ecite.utas.edu.au/77810 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) ENVELOPE(166.766,166.766,-77.849,-77.849) |
geographic |
McMurdo Ice Shelf Ross Island Scott Base |
geographic_facet |
McMurdo Ice Shelf Ross Island Scott Base |
genre |
Antarc* Antarctica Ice Shelf McMurdo Ice Shelf Ross Island The Cryosphere |
genre_facet |
Antarc* Antarctica Ice Shelf McMurdo Ice Shelf Ross Island The Cryosphere |
op_relation |
http://ecite.utas.edu.au/77810/1/Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica.pdf http://dx.doi.org/10.5194/tc-5-391-2011 Kruetzmann, NC and Rack, W and McDonald, AJ and George, SE, Snow accumulation and compaction derived from GPR data near Ross Island, Antarctica, The Cryosphere, 5, (2) pp. 391-404. ISSN 1994-0416 (2011) [Refereed Article] http://ecite.utas.edu.au/77810 |
op_doi |
https://doi.org/10.5194/tc-5-391-2011 |
container_title |
The Cryosphere |
container_volume |
5 |
container_issue |
2 |
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391 |
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404 |
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1766170993186832384 |