Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST)
The isotopic signal of oxygen and hydrogen, archived in the Antarctic ice sheet through snow precipitation, is an important proxy of climatic conditions. This signal depends on several parameters such as local temperature, climatic conditions in the moisture source areas and air mass pathways. Moreo...
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Sapienza Università di Roma
2023
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ftuniveneziairis:oai:iris.unive.it:10278/5036220 2024-02-04T09:55:27+01:00 Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST) Agnese Petteni Barbara Stenni Giuliano Dreossi Ilaria Crotti Mathieu Casado Amaelle Landais Joel Savarino Andrea Spolaor Arianna Caneva Massimo Frezzotti Barbara Delmonte Petteni, Agnese Stenni, Barbara Dreossi, Giuliano Crotti, Ilaria Casado, Mathieu Landais, Amaelle Savarino, Joel Spolaor, Andrea Caneva, Arianna Frezzotti, Massimo Delmonte, Barbara 2023 https://hdl.handle.net/10278/5036220 unknown Sapienza Università di Roma ispartofbook:International Union for Quaternary Research (INQUA 2023) International Union for Quaternary Research (INQUA 2023) https://hdl.handle.net/10278/5036220 info:eu-repo/semantics/openAccess Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/conferenceObject 2023 ftuniveneziairis 2024-01-10T17:40:27Z The isotopic signal of oxygen and hydrogen, archived in the Antarctic ice sheet through snow precipitation, is an important proxy of climatic conditions. This signal depends on several parameters such as local temperature, climatic conditions in the moisture source areas and air mass pathways. Moreover, the isotopic composition may be affected by spatial variability induced by the interactions of the snow surface with the overlying atmosphere along the direction of the prevailing winds. In regions where the snow accumulation is very low, interactions between the atmosphere and the snow surface could modify the pristine signal through isotopic exchanges, sublimation processes and mechanical mixing originated from wind action. The EAIIST (East Antarctic International Ice Sheet Traverse) traverse, that took place during the 2019-2020 Antarctic field season, starting from Concordia Station towards the South Pole, provides a perfect path of study. Along the EAIIST traverse, areas with homogeneous accumulation rates can be compared to areas influenced by wind scouring and mega-dunes formation. Extremely low accumulation and wind-surface snow interaction observed in these areas could be representative of glacial period conditions in the Antarctic Plateau. Here we present the isotopic composition (dD and d18O) of surface (a few cm of depth), bulk (1 m depth) and snow pit (2 m depth) samples along the EAIIST traverse to evaluate the parameters explaining the spatial variability of this proxy. The dD, d18O and, the deuterium excess will be evaluated with respect to geographical features (elevation, latitude, distance from the coast, slope) and climatic conditions (temperature, accumulation, wind speed and direction). Wind action is expected to play a major role in explaining the isotopic spatial variability in these areas. Understanding the spatial variability in the deposition process, which strongly decreases the ratio between signal and noise, is essential to better interpret high-resolution isotopic profiles from firn ... Conference Object Antarc* Antarctic Ice Sheet South pole South pole Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic The Antarctic South Pole Concordia Station ENVELOPE(123.333,123.333,-75.100,-75.100) |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
unknown |
topic |
Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/08 - Geochimica e Vulcanologia Agnese Petteni Barbara Stenni Giuliano Dreossi Ilaria Crotti Mathieu Casado Amaelle Landais Joel Savarino Andrea Spolaor Arianna Caneva Massimo Frezzotti Barbara Delmonte Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST) |
topic_facet |
Settore GEO/08 - Geochimica e Vulcanologia |
description |
The isotopic signal of oxygen and hydrogen, archived in the Antarctic ice sheet through snow precipitation, is an important proxy of climatic conditions. This signal depends on several parameters such as local temperature, climatic conditions in the moisture source areas and air mass pathways. Moreover, the isotopic composition may be affected by spatial variability induced by the interactions of the snow surface with the overlying atmosphere along the direction of the prevailing winds. In regions where the snow accumulation is very low, interactions between the atmosphere and the snow surface could modify the pristine signal through isotopic exchanges, sublimation processes and mechanical mixing originated from wind action. The EAIIST (East Antarctic International Ice Sheet Traverse) traverse, that took place during the 2019-2020 Antarctic field season, starting from Concordia Station towards the South Pole, provides a perfect path of study. Along the EAIIST traverse, areas with homogeneous accumulation rates can be compared to areas influenced by wind scouring and mega-dunes formation. Extremely low accumulation and wind-surface snow interaction observed in these areas could be representative of glacial period conditions in the Antarctic Plateau. Here we present the isotopic composition (dD and d18O) of surface (a few cm of depth), bulk (1 m depth) and snow pit (2 m depth) samples along the EAIIST traverse to evaluate the parameters explaining the spatial variability of this proxy. The dD, d18O and, the deuterium excess will be evaluated with respect to geographical features (elevation, latitude, distance from the coast, slope) and climatic conditions (temperature, accumulation, wind speed and direction). Wind action is expected to play a major role in explaining the isotopic spatial variability in these areas. Understanding the spatial variability in the deposition process, which strongly decreases the ratio between signal and noise, is essential to better interpret high-resolution isotopic profiles from firn ... |
author2 |
Petteni, Agnese Stenni, Barbara Dreossi, Giuliano Crotti, Ilaria Casado, Mathieu Landais, Amaelle Savarino, Joel Spolaor, Andrea Caneva, Arianna Frezzotti, Massimo Delmonte, Barbara |
format |
Conference Object |
author |
Agnese Petteni Barbara Stenni Giuliano Dreossi Ilaria Crotti Mathieu Casado Amaelle Landais Joel Savarino Andrea Spolaor Arianna Caneva Massimo Frezzotti Barbara Delmonte |
author_facet |
Agnese Petteni Barbara Stenni Giuliano Dreossi Ilaria Crotti Mathieu Casado Amaelle Landais Joel Savarino Andrea Spolaor Arianna Caneva Massimo Frezzotti Barbara Delmonte |
author_sort |
Agnese Petteni |
title |
Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST) |
title_short |
Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST) |
title_full |
Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST) |
title_fullStr |
Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST) |
title_full_unstemmed |
Spatial variability in isotopic composition of surface snow along the East Antarctic International Ice Sheet Traverse (EAIIST) |
title_sort |
spatial variability in isotopic composition of surface snow along the east antarctic international ice sheet traverse (eaiist) |
publisher |
Sapienza Università di Roma |
publishDate |
2023 |
url |
https://hdl.handle.net/10278/5036220 |
long_lat |
ENVELOPE(123.333,123.333,-75.100,-75.100) |
geographic |
Antarctic The Antarctic South Pole Concordia Station |
geographic_facet |
Antarctic The Antarctic South Pole Concordia Station |
genre |
Antarc* Antarctic Ice Sheet South pole South pole |
genre_facet |
Antarc* Antarctic Ice Sheet South pole South pole |
op_relation |
ispartofbook:International Union for Quaternary Research (INQUA 2023) International Union for Quaternary Research (INQUA 2023) https://hdl.handle.net/10278/5036220 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1789959449308299264 |