The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet
The water isotope composition of snow precipitations, archived in the Antarctic ice sheet every year, is an important proxy of climatic conditions. This signal depends on several parameters such as local temperature, altitude, moisture source areas and air mass pathways. However, especially in areas...
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European Geosciences Union
2023
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ftuniveneziairis:oai:iris.unive.it:10278/5029241 2024-02-11T09:56:54+01:00 The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet Agnese Petteni Mathieu Casado Barbara Stenni Giuliano Dreossi Elise Fourré Amaelle Landais Joel Savarino Andrea Spolaor Barbara Delmonte Silvia Becagli and Massimo Frezzotti Petteni, Agnese Casado, Mathieu Stenni, Barbara Dreossi, Giuliano Fourré, Elise Landais, Amaelle Savarino, Joel Spolaor, Andrea Delmonte, Barbara Becagli and Massimo Frezzotti, Silvia 2023 ELETTRONICO https://hdl.handle.net/10278/5029241 https://doi.org/10.5194/egusphere-egu23-1738 https://meetingorganizer.copernicus.org/EGU23/EGU23-1738.html eng eng European Geosciences Union ispartofbook:EGU General Assembly 2023 EGU General Assembly 2023 volume:EGU23-1738 https://hdl.handle.net/10278/5029241 doi:10.5194/egusphere-egu23-1738 https://meetingorganizer.copernicus.org/EGU23/EGU23-1738.html info:eu-repo/semantics/openAccess Ice cores Antarctica water stable isotopes EAIIST traverse Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/conferenceObject 2023 ftuniveneziairis https://doi.org/10.5194/egusphere-egu23-1738 2024-01-17T17:40:02Z The water isotope composition of snow precipitations, archived in the Antarctic ice sheet every year, is an important proxy of climatic conditions. This signal depends on several parameters such as local temperature, altitude, moisture source areas and air mass pathways. However, especially in areas where snow accumulation is very low (as on the East Antarctic Plateau), the isotopic composition is affected by additional spatial variability induced by the interactions between the atmosphere and snow surface, and the pristine signal may be modified through isotopic exchanges, sublimation processes and mechanical mixing originated from wind action. Here, we present the isotopic composition (D and 18O) and the second-order parameter d-excess of surface snow and snowpit samples collected during the Italian-French campaign in Antarctica (2019-2020). The sampling sites cover the area from Dumont D'Urville to Concordia Station and from Concordia Station towards the South Pole (EAIIST – East Antarctic International Ice Sheet Traverse). These data, compared with a previous dataset of Antarctic surface snow isotopic composition (Masson-Delmotte et al. 2008), are analyzed to determine the variability of the spatial relationship between precipitation isotopic composition and local temperature in relation to geographical parameters (latitude, distance from the coast and elevation). The interpretation of these factors determining the isotope signature is the base to better define the amount of the effects caused by subsequent interaction between atmosphere and surface snow, and by the wind action. Understanding the spatial variability of this proxy, which strongly decreases the signal-to-noise ratio, could permit to improve the use of the “isotopic thermometer” to quantify past changes in temperature based on the stable isotopic record of deep ice cores. Conference Object Antarc* Antarctic Antarctica Ice Sheet South pole South pole Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic Concordia Station ENVELOPE(123.333,123.333,-75.100,-75.100) Dumont d'Urville ENVELOPE(140.017,140.017,-66.667,-66.667) Dumont-d'Urville ENVELOPE(140.013,140.013,-66.667,-66.667) East Antarctic Ice Sheet South Pole The Antarctic |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Ice cores Antarctica water stable isotopes EAIIST traverse Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Ice cores Antarctica water stable isotopes EAIIST traverse Settore GEO/08 - Geochimica e Vulcanologia Agnese Petteni Mathieu Casado Barbara Stenni Giuliano Dreossi Elise Fourré Amaelle Landais Joel Savarino Andrea Spolaor Barbara Delmonte Silvia Becagli and Massimo Frezzotti The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet |
topic_facet |
Ice cores Antarctica water stable isotopes EAIIST traverse Settore GEO/08 - Geochimica e Vulcanologia |
description |
The water isotope composition of snow precipitations, archived in the Antarctic ice sheet every year, is an important proxy of climatic conditions. This signal depends on several parameters such as local temperature, altitude, moisture source areas and air mass pathways. However, especially in areas where snow accumulation is very low (as on the East Antarctic Plateau), the isotopic composition is affected by additional spatial variability induced by the interactions between the atmosphere and snow surface, and the pristine signal may be modified through isotopic exchanges, sublimation processes and mechanical mixing originated from wind action. Here, we present the isotopic composition (D and 18O) and the second-order parameter d-excess of surface snow and snowpit samples collected during the Italian-French campaign in Antarctica (2019-2020). The sampling sites cover the area from Dumont D'Urville to Concordia Station and from Concordia Station towards the South Pole (EAIIST – East Antarctic International Ice Sheet Traverse). These data, compared with a previous dataset of Antarctic surface snow isotopic composition (Masson-Delmotte et al. 2008), are analyzed to determine the variability of the spatial relationship between precipitation isotopic composition and local temperature in relation to geographical parameters (latitude, distance from the coast and elevation). The interpretation of these factors determining the isotope signature is the base to better define the amount of the effects caused by subsequent interaction between atmosphere and surface snow, and by the wind action. Understanding the spatial variability of this proxy, which strongly decreases the signal-to-noise ratio, could permit to improve the use of the “isotopic thermometer” to quantify past changes in temperature based on the stable isotopic record of deep ice cores. |
author2 |
Petteni, Agnese Casado, Mathieu Stenni, Barbara Dreossi, Giuliano Fourré, Elise Landais, Amaelle Savarino, Joel Spolaor, Andrea Delmonte, Barbara Becagli and Massimo Frezzotti, Silvia |
format |
Conference Object |
author |
Agnese Petteni Mathieu Casado Barbara Stenni Giuliano Dreossi Elise Fourré Amaelle Landais Joel Savarino Andrea Spolaor Barbara Delmonte Silvia Becagli and Massimo Frezzotti |
author_facet |
Agnese Petteni Mathieu Casado Barbara Stenni Giuliano Dreossi Elise Fourré Amaelle Landais Joel Savarino Andrea Spolaor Barbara Delmonte Silvia Becagli and Massimo Frezzotti |
author_sort |
Agnese Petteni |
title |
The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet |
title_short |
The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet |
title_full |
The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet |
title_fullStr |
The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet |
title_full_unstemmed |
The spatial variability in isotopic composition of surface snow and snowpits on the East Antarctic Ice Sheet |
title_sort |
spatial variability in isotopic composition of surface snow and snowpits on the east antarctic ice sheet |
publisher |
European Geosciences Union |
publishDate |
2023 |
url |
https://hdl.handle.net/10278/5029241 https://doi.org/10.5194/egusphere-egu23-1738 https://meetingorganizer.copernicus.org/EGU23/EGU23-1738.html |
long_lat |
ENVELOPE(123.333,123.333,-75.100,-75.100) ENVELOPE(140.017,140.017,-66.667,-66.667) ENVELOPE(140.013,140.013,-66.667,-66.667) |
geographic |
Antarctic Concordia Station Dumont d'Urville Dumont-d'Urville East Antarctic Ice Sheet South Pole The Antarctic |
geographic_facet |
Antarctic Concordia Station Dumont d'Urville Dumont-d'Urville East Antarctic Ice Sheet South Pole The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet South pole South pole |
op_relation |
ispartofbook:EGU General Assembly 2023 EGU General Assembly 2023 volume:EGU23-1738 https://hdl.handle.net/10278/5029241 doi:10.5194/egusphere-egu23-1738 https://meetingorganizer.copernicus.org/EGU23/EGU23-1738.html |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/egusphere-egu23-1738 |
_version_ |
1790606786413199360 |