Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica
Stable water isotopologues of snow, firn and ice cores provide valuable information on past climate variations. Yet single profiles are generally not suitable for robust climate reconstructions. Stratigraphic noise, introduced by the irregular deposition, wind-driven erosion and redistribution of sn...
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ftcopernicus:oai:publications.copernicus.org:egusphere108167 2023-11-05T03:36:58+01:00 Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica Hirsch, Nora Zuhr, Alexandra Münch, Thomas Hörhold, Maria Freitag, Johannes Dallmayr, Remi Laepple, Thomas 2023-10-05 application/pdf https://doi.org/10.5194/egusphere-2022-1392 https://egusphere.copernicus.org/preprints/2023/egusphere-2022-1392/ eng eng doi:10.5194/egusphere-2022-1392 https://egusphere.copernicus.org/preprints/2023/egusphere-2022-1392/ eISSN: Text 2023 ftcopernicus https://doi.org/10.5194/egusphere-2022-1392 2023-10-09T16:24:16Z Stable water isotopologues of snow, firn and ice cores provide valuable information on past climate variations. Yet single profiles are generally not suitable for robust climate reconstructions. Stratigraphic noise, introduced by the irregular deposition, wind-driven erosion and redistribution of snow, impacts the utility of high-resolution isotope records, especially in low-accumulation areas. However, it is currently unknown how stratigraphic noise differs across the East Antarctic Plateau and how it is affected by local environmental conditions. Here, we assess the amount and structure of stratigraphic noise at seven sites along a 120 km transect on the plateau of Dronning Maud Land, East Antarctica. Replicated oxygen isotope records of 1 m length were used to estimate signal-to-noise ratios as a measure of stratigraphic noise at sites characterised by different accumulation rates (43–64 mm w.e. a −1 ), snow surface roughnesses and slope inclinations. While we found a high level of stratigraphic noise at all sites, there was also considerable variation between sites. At sastrugi-dominated sites, greater stratigraphic noise coincided with stronger surface roughnesses, steeper slopes and lower accumulation rates, probably related to increased wind speeds. These results provide a first step to modelling stratigraphic noise and might guide site selection and sampling strategies for future expeditions to improve high-resolution climate reconstructions from low-accumulation regions. Text Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica Copernicus Publications: E-Journals |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Stable water isotopologues of snow, firn and ice cores provide valuable information on past climate variations. Yet single profiles are generally not suitable for robust climate reconstructions. Stratigraphic noise, introduced by the irregular deposition, wind-driven erosion and redistribution of snow, impacts the utility of high-resolution isotope records, especially in low-accumulation areas. However, it is currently unknown how stratigraphic noise differs across the East Antarctic Plateau and how it is affected by local environmental conditions. Here, we assess the amount and structure of stratigraphic noise at seven sites along a 120 km transect on the plateau of Dronning Maud Land, East Antarctica. Replicated oxygen isotope records of 1 m length were used to estimate signal-to-noise ratios as a measure of stratigraphic noise at sites characterised by different accumulation rates (43–64 mm w.e. a −1 ), snow surface roughnesses and slope inclinations. While we found a high level of stratigraphic noise at all sites, there was also considerable variation between sites. At sastrugi-dominated sites, greater stratigraphic noise coincided with stronger surface roughnesses, steeper slopes and lower accumulation rates, probably related to increased wind speeds. These results provide a first step to modelling stratigraphic noise and might guide site selection and sampling strategies for future expeditions to improve high-resolution climate reconstructions from low-accumulation regions. |
format |
Text |
author |
Hirsch, Nora Zuhr, Alexandra Münch, Thomas Hörhold, Maria Freitag, Johannes Dallmayr, Remi Laepple, Thomas |
spellingShingle |
Hirsch, Nora Zuhr, Alexandra Münch, Thomas Hörhold, Maria Freitag, Johannes Dallmayr, Remi Laepple, Thomas Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica |
author_facet |
Hirsch, Nora Zuhr, Alexandra Münch, Thomas Hörhold, Maria Freitag, Johannes Dallmayr, Remi Laepple, Thomas |
author_sort |
Hirsch, Nora |
title |
Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica |
title_short |
Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica |
title_full |
Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica |
title_fullStr |
Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica |
title_full_unstemmed |
Stratigraphic noise and its potential drivers across the plateau of Dronning Maud Land, East Antarctica |
title_sort |
stratigraphic noise and its potential drivers across the plateau of dronning maud land, east antarctica |
publishDate |
2023 |
url |
https://doi.org/10.5194/egusphere-2022-1392 https://egusphere.copernicus.org/preprints/2023/egusphere-2022-1392/ |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land East Antarctica |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2022-1392 https://egusphere.copernicus.org/preprints/2023/egusphere-2022-1392/ |
op_doi |
https://doi.org/10.5194/egusphere-2022-1392 |
_version_ |
1781692320270254080 |