Climatic and insolation control on the high-resolution total air content in the NGRIP ice core
Because the total air content (TAC) of polar ice is directly affected by the atmospheric pressure and temperature, its record in polar ice cores was initially considered as a proxy for past ice sheet elevation changes. However, the Antarctic ice core TAC record is known to also contain an insolation...
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fttriple:oai:gotriple.eu:1UlHJtGfb8OPKDUx4RC8O 2023-05-15T14:02:27+02:00 Climatic and insolation control on the high-resolution total air content in the NGRIP ice core Eicher, Olivier Baumgartner, Matthias Schilt, Adrian Schmitt, Jochen Schwander, Jakob Stocker, Thomas F. Fischer, Hubertus 2018-09-27 https://doi.org/10.5194/cp-12-1979-2016 https://cp.copernicus.org/articles/12/1979/2016/ en eng Copernicus Publications doi:10.5194/cp-12-1979-2016 10670/1.9kaivl 1814-9324 1814-9332 https://cp.copernicus.org/articles/12/1979/2016/ 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-12-1979-2016 2023-01-22T17:39:16Z Because the total air content (TAC) of polar ice is directly affected by the atmospheric pressure and temperature, its record in polar ice cores was initially considered as a proxy for past ice sheet elevation changes. However, the Antarctic ice core TAC record is known to also contain an insolation signature, although the underlying physical mechanisms are still a matter of debate. Here we present a high-resolution TAC record over the whole North Greenland Ice Core Project ice core, covering the last 120 000 years, which independently supports an insolation signature in Greenland. Wavelet analysis reveals a clear precession and obliquity signal similar to previous findings on Antarctic TAC, with a different insolation history. In our high-resolution record we also find a decrease of 4–6 % (4–5 mL kg−1) in TAC as a response to Dansgaard–Oeschger events (DO events). TAC starts to decrease in parallel to increasing Greenland surface temperature and slightly before CH4 reacts to the warming but also shows a two-step decline that lasts for several centuries into the warm interstadial. The TAC response is larger than expected considering only changes in air density by local temperature and atmospheric pressure as a driver, pointing to a transient firnification response caused by the accumulation-induced increase in the load on the firn at bubble close-off, while temperature changes deeper in the firn are still small. Article in Journal/Newspaper Antarc* Antarctic Dansgaard-Oeschger events Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project Unknown Antarctic Greenland Tac ENVELOPE(-59.517,-59.517,-62.500,-62.500) The Antarctic Climate of the Past 12 10 1979 1993 |
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English |
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geo envir Eicher, Olivier Baumgartner, Matthias Schilt, Adrian Schmitt, Jochen Schwander, Jakob Stocker, Thomas F. Fischer, Hubertus Climatic and insolation control on the high-resolution total air content in the NGRIP ice core |
topic_facet |
geo envir |
description |
Because the total air content (TAC) of polar ice is directly affected by the atmospheric pressure and temperature, its record in polar ice cores was initially considered as a proxy for past ice sheet elevation changes. However, the Antarctic ice core TAC record is known to also contain an insolation signature, although the underlying physical mechanisms are still a matter of debate. Here we present a high-resolution TAC record over the whole North Greenland Ice Core Project ice core, covering the last 120 000 years, which independently supports an insolation signature in Greenland. Wavelet analysis reveals a clear precession and obliquity signal similar to previous findings on Antarctic TAC, with a different insolation history. In our high-resolution record we also find a decrease of 4–6 % (4–5 mL kg−1) in TAC as a response to Dansgaard–Oeschger events (DO events). TAC starts to decrease in parallel to increasing Greenland surface temperature and slightly before CH4 reacts to the warming but also shows a two-step decline that lasts for several centuries into the warm interstadial. The TAC response is larger than expected considering only changes in air density by local temperature and atmospheric pressure as a driver, pointing to a transient firnification response caused by the accumulation-induced increase in the load on the firn at bubble close-off, while temperature changes deeper in the firn are still small. |
format |
Article in Journal/Newspaper |
author |
Eicher, Olivier Baumgartner, Matthias Schilt, Adrian Schmitt, Jochen Schwander, Jakob Stocker, Thomas F. Fischer, Hubertus |
author_facet |
Eicher, Olivier Baumgartner, Matthias Schilt, Adrian Schmitt, Jochen Schwander, Jakob Stocker, Thomas F. Fischer, Hubertus |
author_sort |
Eicher, Olivier |
title |
Climatic and insolation control on the high-resolution total air content in the NGRIP ice core |
title_short |
Climatic and insolation control on the high-resolution total air content in the NGRIP ice core |
title_full |
Climatic and insolation control on the high-resolution total air content in the NGRIP ice core |
title_fullStr |
Climatic and insolation control on the high-resolution total air content in the NGRIP ice core |
title_full_unstemmed |
Climatic and insolation control on the high-resolution total air content in the NGRIP ice core |
title_sort |
climatic and insolation control on the high-resolution total air content in the ngrip ice core |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-12-1979-2016 https://cp.copernicus.org/articles/12/1979/2016/ |
long_lat |
ENVELOPE(-59.517,-59.517,-62.500,-62.500) |
geographic |
Antarctic Greenland Tac The Antarctic |
geographic_facet |
Antarctic Greenland Tac The Antarctic |
genre |
Antarc* Antarctic Dansgaard-Oeschger events Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project |
genre_facet |
Antarc* Antarctic Dansgaard-Oeschger events Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-12-1979-2016 10670/1.9kaivl 1814-9324 1814-9332 https://cp.copernicus.org/articles/12/1979/2016/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-12-1979-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
10 |
container_start_page |
1979 |
op_container_end_page |
1993 |
_version_ |
1766272729537839104 |