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 δ18O-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 o...
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Online Access: | https://doi.org/10.5194/cp-12-1565-2016 https://cp.copernicus.org/articles/12/1565/2016/ |
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fttriple:oai:gotriple.eu:RAqhHDjCsMw942XpUhDWZ 2023-05-15T13:43:26+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 https://doi.org/10.5194/cp-12-1565-2016 https://cp.copernicus.org/articles/12/1565/2016/ en eng Copernicus Publications doi:10.5194/cp-12-1565-2016 10670/1.rst95x 1814-9324 1814-9332 https://cp.copernicus.org/articles/12/1565/2016/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-12-1565-2016 2023-01-22T17:54:30Z In low-accumulation regions, the reliability of δ18O-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 δ18O 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land ice core Unknown 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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geo envir 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 |
topic_facet |
geo envir |
description |
In low-accumulation regions, the reliability of δ18O-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 δ18O 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 |
Article in Journal/Newspaper |
author |
Münch, Thomas Kipfstuhl, Sepp Freitag, Johannes Meyer, Hanno Laepple, Thomas |
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 |
Copernicus Publications |
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 |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-12-1565-2016 10670/1.rst95x 1814-9324 1814-9332 https://cp.copernicus.org/articles/12/1565/2016/ |
op_rights |
undefined |
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 |
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1766189055406505984 |