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 δ 18 O-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...
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ftcopernicus:oai:publications.copernicus.org:cp47772 2023-05-15T13:54:27+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 2018-09-27 application/pdf https://doi.org/10.5194/cp-12-1565-2016 https://cp.copernicus.org/articles/12/1565/2016/ eng eng doi:10.5194/cp-12-1565-2016 https://cp.copernicus.org/articles/12/1565/2016/ eISSN: 1814-9332 Text 2018 ftcopernicus https://doi.org/10.5194/cp-12-1565-2016 2020-07-20T16:24:03Z In low-accumulation regions, the reliability of δ 18 O-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 δ 18 O in two 50 m 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. Text Antarc* Antarctic Antarctica Dronning Maud Land ice core Copernicus Publications: E-Journals 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) Climate of the Past 12 7 1565 1581 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
In low-accumulation regions, the reliability of δ 18 O-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 δ 18 O in two 50 m 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. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-12-1565-2016 https://cp.copernicus.org/articles/12/1565/2016/ |
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_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-12-1565-2016 https://cp.copernicus.org/articles/12/1565/2016/ |
op_doi |
https://doi.org/10.5194/cp-12-1565-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
7 |
container_start_page |
1565 |
op_container_end_page |
1581 |
_version_ |
1766260336508272640 |