Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica
Predictions concerning Antarctica's contribution to sea level change have been hampered by poor knowledge of surface mass balance. Snow accumulation is the most direct climate indicator and has important implications for paleoclimatic reconstruction from ice cores. Snow accumulation measurement...
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ftopenaccessrep:oai:zenodo.org:159942 2024-05-12T07:53:37+00:00 Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica Frezzotti, Massimo Urbini, Stefano Proposito, Marco Scarchilli, Claudio Gandolfi, Stefano 2007-06-12 https://www.openaccessrepository.it/record/159942 https://doi.org/10.1029/2006jf000638 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/159942 doi:10.1029/2006jf000638 info:eu-repo/semantics/openAccess Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics info:eu-repo/semantics/article publication-article 2007 ftopenaccessrep https://doi.org/10.1029/2006jf000638 2024-04-17T14:48:21Z Predictions concerning Antarctica's contribution to sea level change have been hampered by poor knowledge of surface mass balance. Snow accumulation is the most direct climate indicator and has important implications for paleoclimatic reconstruction from ice cores. Snow accumulation measurements (stake, core, snow radar) taken along a 500â€km transect crossing Talos Dome (East Antarctica) have been used to assess accumulation signals and the representativeness of ice core records. Stake readings show that accumulation hiatuses can occur at sites with accumulation rates below 120 kg m−2 yr−1. Differences between cores and stakes can lead to statistical misidentification of annual layers determined from seasonal signals at sites with accumulation rates below 200 kg m−2 yr−1 because of nondetection of higher and lower values. Achieving ±10% accuracy in the reconstruction of snow accumulation from single cores requires high accumulation (750 kg m−2 yr−1). Lowâ€accumulation sites are representative if cumulative rates computed over several years are used to reach the 750 kg m−2 yr−1 threshold. Temporal variability of accumulation over the last two centuries shows no significant increase in accumulation. Windâ€driven processes are a fundamental component of surface mass balance. Spatial variations in accumulation are well correlated with surface slope changes along the wind direction and may exceed 200 kg m−2 yr−1 within 1 km. Windâ€driven sublimation rates are less than 50 kg m−2 yr−1 in plateau areas and up to 260 kg m−2 yr−1 in slope areas and account for 20–75% of precipitation, whereas depositional features are negligible in surface mass balance. Article in Journal/Newspaper Antarc* Antarctica East Antarctica ice core Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository East Antarctica Talos Dome ENVELOPE(158.000,158.000,-73.000,-73.000) Journal of Geophysical Research: Earth Surface 112 F2 |
institution |
Open Polar |
collection |
Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
op_collection_id |
ftopenaccessrep |
language |
English |
topic |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
spellingShingle |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics Frezzotti, Massimo Urbini, Stefano Proposito, Marco Scarchilli, Claudio Gandolfi, Stefano Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica |
topic_facet |
Paleontology Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Earth-Surface Processes Geochemistry and Petrology Soil Science Water Science and Technology Ecology Aquatic Science Forestry Oceanography Geophysics |
description |
Predictions concerning Antarctica's contribution to sea level change have been hampered by poor knowledge of surface mass balance. Snow accumulation is the most direct climate indicator and has important implications for paleoclimatic reconstruction from ice cores. Snow accumulation measurements (stake, core, snow radar) taken along a 500â€km transect crossing Talos Dome (East Antarctica) have been used to assess accumulation signals and the representativeness of ice core records. Stake readings show that accumulation hiatuses can occur at sites with accumulation rates below 120 kg m−2 yr−1. Differences between cores and stakes can lead to statistical misidentification of annual layers determined from seasonal signals at sites with accumulation rates below 200 kg m−2 yr−1 because of nondetection of higher and lower values. Achieving ±10% accuracy in the reconstruction of snow accumulation from single cores requires high accumulation (750 kg m−2 yr−1). Lowâ€accumulation sites are representative if cumulative rates computed over several years are used to reach the 750 kg m−2 yr−1 threshold. Temporal variability of accumulation over the last two centuries shows no significant increase in accumulation. Windâ€driven processes are a fundamental component of surface mass balance. Spatial variations in accumulation are well correlated with surface slope changes along the wind direction and may exceed 200 kg m−2 yr−1 within 1 km. Windâ€driven sublimation rates are less than 50 kg m−2 yr−1 in plateau areas and up to 260 kg m−2 yr−1 in slope areas and account for 20–75% of precipitation, whereas depositional features are negligible in surface mass balance. |
format |
Article in Journal/Newspaper |
author |
Frezzotti, Massimo Urbini, Stefano Proposito, Marco Scarchilli, Claudio Gandolfi, Stefano |
author_facet |
Frezzotti, Massimo Urbini, Stefano Proposito, Marco Scarchilli, Claudio Gandolfi, Stefano |
author_sort |
Frezzotti, Massimo |
title |
Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica |
title_short |
Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica |
title_full |
Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica |
title_fullStr |
Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica |
title_full_unstemmed |
Spatial and temporal variability of surface mass balance near Talos Dome, East Antarctica |
title_sort |
spatial and temporal variability of surface mass balance near talos dome, east antarctica |
publishDate |
2007 |
url |
https://www.openaccessrepository.it/record/159942 https://doi.org/10.1029/2006jf000638 |
long_lat |
ENVELOPE(158.000,158.000,-73.000,-73.000) |
geographic |
East Antarctica Talos Dome |
geographic_facet |
East Antarctica Talos Dome |
genre |
Antarc* Antarctica East Antarctica ice core |
genre_facet |
Antarc* Antarctica East Antarctica ice core |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/159942 doi:10.1029/2006jf000638 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2006jf000638 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
112 |
container_issue |
F2 |
_version_ |
1798843606541271040 |