Representative surface snow density on the East Antarctic Plateau
Surface mass balances of polar ice sheets are essential to estimate the contribution of ice sheets to sea level rise. Uncertain snow and firn densities lead to significant uncertainties in surface mass balances, especially in the interior regions of the ice sheets, such as the East Antarctic Plateau...
Published in: | The Cryosphere |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2020
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Online Access: | https://curis.ku.dk/portal/da/publications/representative-surface-snow-density-on-the-east-antarctic-plateau(0786bf55-4794-4020-9ab9-4292bc7bcea0).html https://doi.org/10.5194/tc-14-3663-2020 https://curis.ku.dk/ws/files/252471893/tc_14_3663_2020.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/0786bf55-4794-4020-9ab9-4292bc7bcea0 2024-04-14T08:02:28+00:00 Representative surface snow density on the East Antarctic Plateau Weinhart, Alexander H. Freitag, Johannes Hoerhold, Maria Kipfstuhl, Sepp Eisen, Olaf 2020-11-05 application/pdf https://curis.ku.dk/portal/da/publications/representative-surface-snow-density-on-the-east-antarctic-plateau(0786bf55-4794-4020-9ab9-4292bc7bcea0).html https://doi.org/10.5194/tc-14-3663-2020 https://curis.ku.dk/ws/files/252471893/tc_14_3663_2020.pdf eng eng info:eu-repo/semantics/openAccess Weinhart , A H , Freitag , J , Hoerhold , M , Kipfstuhl , S & Eisen , O 2020 , ' Representative surface snow density on the East Antarctic Plateau ' , Cryosphere , vol. 14 , no. 11 , pp. 3663-3685 . https://doi.org/10.5194/tc-14-3663-2020 DRONNING MAUD-LAND KOHNEN STATION MASS-BALANCE ICE-CORE ACCUMULATION RATE ELEVATION CHANGES DOME FUJI FIRN CLIMATE MODEL article 2020 ftcopenhagenunip https://doi.org/10.5194/tc-14-3663-2020 2024-03-21T17:28:11Z Surface mass balances of polar ice sheets are essential to estimate the contribution of ice sheets to sea level rise. Uncertain snow and firn densities lead to significant uncertainties in surface mass balances, especially in the interior regions of the ice sheets, such as the East Antarctic Plateau (EAP). Robust field measurements of surface snow density are sparse and challenging due to local noise. Here, we present a snow density dataset from an overland traverse in austral summer 2016/17 on the Dronning Maud Land plateau. The sampling strategy using 1 m carbon fiber tubes covered various spatial scales, as well as a high-resolution study in a trench at 79 degrees S, 30 degrees E. The 1 m snow density has been derived volumetrically, and vertical snow profiles have been measured using a core-scale microfocus X-ray computer tomograph. With an error of less than 2 %, our method provides higher precision than other sampling devices of smaller volume. With four spatially independent snow profiles per location, we reduce the local noise and derive a representative 1m snow density with an error of the mean of less than 1.5 %. Assessing sampling methods used in previous studies, we find the highest horizontal variability in density in the upper 0.3 m and therefore recommend the 1 m snow density as a robust measure of surface snow density in future studies. The average 1 m snow density across the EAP is 355 kg m(-3), which we identify as representative surface snow density between Kohnen Station and Dome Fuji. We cannot detect a temporal trend caused by the temperature increase over the last 2 decades. A difference of more than 10% to the density of 320 kg m(-3) suggested by a semiempirical firn model for the same region indicates the necessity for further calibration of surface snow density parameterizations. Our data provide a solid baseline for tuning the surface snow density parameterizations for regions with low accumulation and low temperatures like the EAP. Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land ice core University of Copenhagen: Research Antarctic Austral Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Dronning Maud Land Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Kohnen Station ENVELOPE(0.000,0.000,-75.000,-75.000) The Cryosphere 14 11 3663 3685 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
DRONNING MAUD-LAND KOHNEN STATION MASS-BALANCE ICE-CORE ACCUMULATION RATE ELEVATION CHANGES DOME FUJI FIRN CLIMATE MODEL |
spellingShingle |
DRONNING MAUD-LAND KOHNEN STATION MASS-BALANCE ICE-CORE ACCUMULATION RATE ELEVATION CHANGES DOME FUJI FIRN CLIMATE MODEL Weinhart, Alexander H. Freitag, Johannes Hoerhold, Maria Kipfstuhl, Sepp Eisen, Olaf Representative surface snow density on the East Antarctic Plateau |
topic_facet |
DRONNING MAUD-LAND KOHNEN STATION MASS-BALANCE ICE-CORE ACCUMULATION RATE ELEVATION CHANGES DOME FUJI FIRN CLIMATE MODEL |
description |
Surface mass balances of polar ice sheets are essential to estimate the contribution of ice sheets to sea level rise. Uncertain snow and firn densities lead to significant uncertainties in surface mass balances, especially in the interior regions of the ice sheets, such as the East Antarctic Plateau (EAP). Robust field measurements of surface snow density are sparse and challenging due to local noise. Here, we present a snow density dataset from an overland traverse in austral summer 2016/17 on the Dronning Maud Land plateau. The sampling strategy using 1 m carbon fiber tubes covered various spatial scales, as well as a high-resolution study in a trench at 79 degrees S, 30 degrees E. The 1 m snow density has been derived volumetrically, and vertical snow profiles have been measured using a core-scale microfocus X-ray computer tomograph. With an error of less than 2 %, our method provides higher precision than other sampling devices of smaller volume. With four spatially independent snow profiles per location, we reduce the local noise and derive a representative 1m snow density with an error of the mean of less than 1.5 %. Assessing sampling methods used in previous studies, we find the highest horizontal variability in density in the upper 0.3 m and therefore recommend the 1 m snow density as a robust measure of surface snow density in future studies. The average 1 m snow density across the EAP is 355 kg m(-3), which we identify as representative surface snow density between Kohnen Station and Dome Fuji. We cannot detect a temporal trend caused by the temperature increase over the last 2 decades. A difference of more than 10% to the density of 320 kg m(-3) suggested by a semiempirical firn model for the same region indicates the necessity for further calibration of surface snow density parameterizations. Our data provide a solid baseline for tuning the surface snow density parameterizations for regions with low accumulation and low temperatures like the EAP. |
format |
Article in Journal/Newspaper |
author |
Weinhart, Alexander H. Freitag, Johannes Hoerhold, Maria Kipfstuhl, Sepp Eisen, Olaf |
author_facet |
Weinhart, Alexander H. Freitag, Johannes Hoerhold, Maria Kipfstuhl, Sepp Eisen, Olaf |
author_sort |
Weinhart, Alexander H. |
title |
Representative surface snow density on the East Antarctic Plateau |
title_short |
Representative surface snow density on the East Antarctic Plateau |
title_full |
Representative surface snow density on the East Antarctic Plateau |
title_fullStr |
Representative surface snow density on the East Antarctic Plateau |
title_full_unstemmed |
Representative surface snow density on the East Antarctic Plateau |
title_sort |
representative surface snow density on the east antarctic plateau |
publishDate |
2020 |
url |
https://curis.ku.dk/portal/da/publications/representative-surface-snow-density-on-the-east-antarctic-plateau(0786bf55-4794-4020-9ab9-4292bc7bcea0).html https://doi.org/10.5194/tc-14-3663-2020 https://curis.ku.dk/ws/files/252471893/tc_14_3663_2020.pdf |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.000,0.000,-75.000,-75.000) |
geographic |
Antarctic Austral Dome Fuji Dronning Maud Land Kohnen Kohnen Station |
geographic_facet |
Antarctic Austral Dome Fuji Dronning Maud Land Kohnen Kohnen Station |
genre |
Antarc* Antarctic Dronning Maud Land ice core |
genre_facet |
Antarc* Antarctic Dronning Maud Land ice core |
op_source |
Weinhart , A H , Freitag , J , Hoerhold , M , Kipfstuhl , S & Eisen , O 2020 , ' Representative surface snow density on the East Antarctic Plateau ' , Cryosphere , vol. 14 , no. 11 , pp. 3663-3685 . https://doi.org/10.5194/tc-14-3663-2020 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-14-3663-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
11 |
container_start_page |
3663 |
op_container_end_page |
3685 |
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1796315121312595968 |