Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land
In low-accumulation regions, the reliability of delta O-18-derived temperature signals from ice cores within the Holocene is unclear, primarily due to the small climate changes relative to the intrinsic noise of the isotopic signal. In order to learn about the representativity of single ice cores an...
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ftdatacite:10.25932/publishup-40838 2023-05-15T13:39:54+02:00 Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land Münch, Thomas Kipfstuhl, Sepp Freitag, Johannes Meyer, Hanno Laepple, Thomas 2019 application/pdf application/zip https://dx.doi.org/10.25932/publishup-40838 https://publishup.uni-potsdam.de/40838 en eng Universität Potsdam Creative Commons - Namensnennung, 4.0 International https://creativecommons.org/licenses/by/4.0 CC-BY article-journal Text ScholarlyArticle 2019 ftdatacite https://doi.org/10.25932/publishup-40838 2021-11-05T12:55:41Z In low-accumulation regions, the reliability of delta O-18-derived temperature signals from ice cores within the Holocene is unclear, primarily due to the small climate changes relative to the intrinsic noise of the isotopic signal. In order to learn about the representativity of single ice cores and to optimise future ice-core-based climate reconstructions, we studied the stable-water isotope composition of firn at Kohnen Station, Dronning Maud Land, Antarctica. Analysing delta O-18 in two 50m long snow trenches allowed us to create an unprecedented, two-dimensional image characterising the isotopic variations from the centimetre to the 100-metre scale. Our results show seasonal layering of the isotopic composition but also high horizontal isotopic variability caused by local stratigraphic noise. Based on the horizontal and vertical structure of the isotopic variations, we derive a statistical noise model which successfully explains the trench data. The model further allows one to determine an upper bound for the reliability of climate reconstructions conducted in our study region at seasonal to annual resolution, depending on the number and the spacing of the cores taken. : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 500 Text Antarc* Antarctic Antarctica Dronning Maud Land ice core DataCite Metadata Store (German National Library of Science and Technology) Antarctic Dronning Maud Land Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Kohnen Station ENVELOPE(0.000,0.000,-75.000,-75.000) |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
English |
description |
In low-accumulation regions, the reliability of delta O-18-derived temperature signals from ice cores within the Holocene is unclear, primarily due to the small climate changes relative to the intrinsic noise of the isotopic signal. In order to learn about the representativity of single ice cores and to optimise future ice-core-based climate reconstructions, we studied the stable-water isotope composition of firn at Kohnen Station, Dronning Maud Land, Antarctica. Analysing delta O-18 in two 50m long snow trenches allowed us to create an unprecedented, two-dimensional image characterising the isotopic variations from the centimetre to the 100-metre scale. Our results show seasonal layering of the isotopic composition but also high horizontal isotopic variability caused by local stratigraphic noise. Based on the horizontal and vertical structure of the isotopic variations, we derive a statistical noise model which successfully explains the trench data. The model further allows one to determine an upper bound for the reliability of climate reconstructions conducted in our study region at seasonal to annual resolution, depending on the number and the spacing of the cores taken. : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 500 |
format |
Text |
author |
Münch, Thomas Kipfstuhl, Sepp Freitag, Johannes Meyer, Hanno Laepple, Thomas |
spellingShingle |
Münch, Thomas Kipfstuhl, Sepp Freitag, Johannes Meyer, Hanno Laepple, Thomas Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land |
author_facet |
Münch, Thomas Kipfstuhl, Sepp Freitag, Johannes Meyer, Hanno Laepple, Thomas |
author_sort |
Münch, Thomas |
title |
Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land |
title_short |
Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land |
title_full |
Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land |
title_fullStr |
Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land |
title_full_unstemmed |
Regional climate signal vs. local noise : a two-dimensional view of water isotopes in Antarctic firn at Kohnen Station, Dronning Maud Land |
title_sort |
regional climate signal vs. local noise : a two-dimensional view of water isotopes in antarctic firn at kohnen station, dronning maud land |
publisher |
Universität Potsdam |
publishDate |
2019 |
url |
https://dx.doi.org/10.25932/publishup-40838 https://publishup.uni-potsdam.de/40838 |
long_lat |
ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.000,0.000,-75.000,-75.000) |
geographic |
Antarctic Dronning Maud Land Kohnen Kohnen Station |
geographic_facet |
Antarctic Dronning Maud Land Kohnen Kohnen Station |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land ice core |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land ice core |
op_rights |
Creative Commons - Namensnennung, 4.0 International https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25932/publishup-40838 |
_version_ |
1766125951762038784 |