Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland
The previous interglacial (Eemian, 130–114 kyr BP) had a mean sea level highstand 4 to 7 m above the current level, and, according to climate proxies, a 2 to 6 K warmer Arctic summer climate. Greenland ice cores extending back into the Eemian show a reduced depletion in δ18O of about 3‰ for this per...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/290638 2023-07-23T04:17:52+02:00 Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland van de Berg, W.J. van den Broeke, M.R. van Meijgaard, E. Kaspar, F. Marine and Atmospheric Research Sub Dynamics Meteorology 2013 image/pdf https://dspace.library.uu.nl/handle/1874/290638 en eng 1814-9324 https://dspace.library.uu.nl/handle/1874/290638 info:eu-repo/semantics/OpenAccess Article 2013 ftunivutrecht 2023-07-02T00:51:56Z The previous interglacial (Eemian, 130–114 kyr BP) had a mean sea level highstand 4 to 7 m above the current level, and, according to climate proxies, a 2 to 6 K warmer Arctic summer climate. Greenland ice cores extending back into the Eemian show a reduced depletion in δ18O of about 3‰ for this period, which suggests a significant warming of several degrees over the Greenland ice sheet. Since the depletion in δ18O depends, among other factors, on the condensation temperature of the precipitation, we analyze climatological processes other than mean temperature changes that influence condensation temperature, using output of the regional climate model RACMO2. This model is driven by ERA-40 reanalysis and ECHO-G GCM boundaries for present-day, preindustrial and Eemian climate. The processes that affect the condensation temperature of the precipitation are analyzed using 6-hourly model output. Our results show that changes in precipitation seasonality can cause significant changes of up to 2 K in the condensation temperature that are unrelated to changes in mean temperature. Article in Journal/Newspaper Arctic Greenland Greenland ice cores ice core Ice Sheet Utrecht University Repository Arctic Greenland |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
description |
The previous interglacial (Eemian, 130–114 kyr BP) had a mean sea level highstand 4 to 7 m above the current level, and, according to climate proxies, a 2 to 6 K warmer Arctic summer climate. Greenland ice cores extending back into the Eemian show a reduced depletion in δ18O of about 3‰ for this period, which suggests a significant warming of several degrees over the Greenland ice sheet. Since the depletion in δ18O depends, among other factors, on the condensation temperature of the precipitation, we analyze climatological processes other than mean temperature changes that influence condensation temperature, using output of the regional climate model RACMO2. This model is driven by ERA-40 reanalysis and ECHO-G GCM boundaries for present-day, preindustrial and Eemian climate. The processes that affect the condensation temperature of the precipitation are analyzed using 6-hourly model output. Our results show that changes in precipitation seasonality can cause significant changes of up to 2 K in the condensation temperature that are unrelated to changes in mean temperature. |
author2 |
Marine and Atmospheric Research Sub Dynamics Meteorology |
format |
Article in Journal/Newspaper |
author |
van de Berg, W.J. van den Broeke, M.R. van Meijgaard, E. Kaspar, F. |
spellingShingle |
van de Berg, W.J. van den Broeke, M.R. van Meijgaard, E. Kaspar, F. Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland |
author_facet |
van de Berg, W.J. van den Broeke, M.R. van Meijgaard, E. Kaspar, F. |
author_sort |
van de Berg, W.J. |
title |
Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland |
title_short |
Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland |
title_full |
Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland |
title_fullStr |
Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland |
title_full_unstemmed |
Importance of precipitation seasonality for the interpretation of Eemian ice core isotope records from Greenland |
title_sort |
importance of precipitation seasonality for the interpretation of eemian ice core isotope records from greenland |
publishDate |
2013 |
url |
https://dspace.library.uu.nl/handle/1874/290638 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland ice cores ice core Ice Sheet |
genre_facet |
Arctic Greenland Greenland ice cores ice core Ice Sheet |
op_relation |
1814-9324 https://dspace.library.uu.nl/handle/1874/290638 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772179947067015168 |