Borehole versus isotope temperatures on Greenland: Seasonality does matter
New simulation results obtained with the Hamburg Atmosphere General Circulation Model ECHAM-4 under maximum glacial boundary (LGM) conditions confirm the paleotemperatures on Greenland determined by borehole thermometry. The disagreement between delta(18)O isotope based temperatures and the borehole...
Published in: | Geophysical Research Letters |
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ftpubman:oai:pure.mpg.de:item_1690920 2023-08-27T04:09:39+02:00 Borehole versus isotope temperatures on Greenland: Seasonality does matter Werner, M. Mikolajewicz, U. Heimann, M. Hoffmann, G. 2000 application/octet-stream http://hdl.handle.net/11858/00-001M-0000-000E-CD44-8 http://hdl.handle.net/11858/00-001M-0000-000E-CD43-A unknown info:eu-repo/semantics/altIdentifier/doi/10.1029/1999GL006075 http://hdl.handle.net/11858/00-001M-0000-000E-CD44-8 http://hdl.handle.net/11858/00-001M-0000-000E-CD43-A Geophysical Research Letters info:eu-repo/semantics/article 2000 ftpubman https://doi.org/10.1029/1999GL006075 2023-08-02T01:02:48Z New simulation results obtained with the Hamburg Atmosphere General Circulation Model ECHAM-4 under maximum glacial boundary (LGM) conditions confirm the paleotemperatures on Greenland determined by borehole thermometry. The disagreement between delta(18)O isotope based temperatures and the borehole temperatures of the LGM is not only reproduced by the model, but the simulation results provide a plausible explanation: Paleotemperatures inferred from delta(18)O measurements in ice cores are biased by a substantially increased seasonality of precipitation over Greenland during the LGM. During the glacial winter a much mote zonal circulation prevents the effective transport of moisture to the Greenland ice sheet, and therefore reduces the contribution of isotopically strongly depleted winter snow to the annual mean isotope signal. [References: 21] Article in Journal/Newspaper Greenland Ice Sheet Max Planck Society: MPG.PuRe Greenland Geophysical Research Letters 27 5 723 726 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
unknown |
description |
New simulation results obtained with the Hamburg Atmosphere General Circulation Model ECHAM-4 under maximum glacial boundary (LGM) conditions confirm the paleotemperatures on Greenland determined by borehole thermometry. The disagreement between delta(18)O isotope based temperatures and the borehole temperatures of the LGM is not only reproduced by the model, but the simulation results provide a plausible explanation: Paleotemperatures inferred from delta(18)O measurements in ice cores are biased by a substantially increased seasonality of precipitation over Greenland during the LGM. During the glacial winter a much mote zonal circulation prevents the effective transport of moisture to the Greenland ice sheet, and therefore reduces the contribution of isotopically strongly depleted winter snow to the annual mean isotope signal. [References: 21] |
format |
Article in Journal/Newspaper |
author |
Werner, M. Mikolajewicz, U. Heimann, M. Hoffmann, G. |
spellingShingle |
Werner, M. Mikolajewicz, U. Heimann, M. Hoffmann, G. Borehole versus isotope temperatures on Greenland: Seasonality does matter |
author_facet |
Werner, M. Mikolajewicz, U. Heimann, M. Hoffmann, G. |
author_sort |
Werner, M. |
title |
Borehole versus isotope temperatures on Greenland: Seasonality does matter |
title_short |
Borehole versus isotope temperatures on Greenland: Seasonality does matter |
title_full |
Borehole versus isotope temperatures on Greenland: Seasonality does matter |
title_fullStr |
Borehole versus isotope temperatures on Greenland: Seasonality does matter |
title_full_unstemmed |
Borehole versus isotope temperatures on Greenland: Seasonality does matter |
title_sort |
borehole versus isotope temperatures on greenland: seasonality does matter |
publishDate |
2000 |
url |
http://hdl.handle.net/11858/00-001M-0000-000E-CD44-8 http://hdl.handle.net/11858/00-001M-0000-000E-CD43-A |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Geophysical Research Letters |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/1999GL006075 http://hdl.handle.net/11858/00-001M-0000-000E-CD44-8 http://hdl.handle.net/11858/00-001M-0000-000E-CD43-A |
op_doi |
https://doi.org/10.1029/1999GL006075 |
container_title |
Geophysical Research Letters |
container_volume |
27 |
container_issue |
5 |
container_start_page |
723 |
op_container_end_page |
726 |
_version_ |
1775351189030830080 |