Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study
During the past two decades, several atmospheric and oceanic general circulation models (GCMs) have been enhanced by the capability to explicitly simulate the hydrological cycle of the two stable water isotopes H218O and HDO. For Greenland and Antarctic ice cores, a number of previous studies have d...
Main Authors: | , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2012
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/31471/ http://meetingorganizer.copernicus.org/EGU2012/EGU2012-9190.pdf https://hdl.handle.net/10013/epic.40247 |
id |
ftawi:oai:epic.awi.de:31471 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:31471 2024-09-15T17:45:35+00:00 Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study Werner, Martin Dietrich, Stephan Lohmann, Gerrit 2012-04-25 https://epic.awi.de/id/eprint/31471/ http://meetingorganizer.copernicus.org/EGU2012/EGU2012-9190.pdf https://hdl.handle.net/10013/epic.40247 unknown Werner, M. orcid:0000-0002-6473-0243 , Dietrich, S. and Lohmann, G. orcid:0000-0003-2089-733X (2012) Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study , EGU General Assembly 2012, Vienna, 22 April 2012 - 27 April 2012 . hdl:10013/epic.40247 EPIC3EGU General Assembly 2012, Vienna, 2012-04-22-2012-04-27 Conference notRev 2012 ftawi 2024-06-24T04:05:07Z During the past two decades, several atmospheric and oceanic general circulation models (GCMs) have been enhanced by the capability to explicitly simulate the hydrological cycle of the two stable water isotopes H218O and HDO. For Greenland and Antarctic ice cores, a number of previous studies have demonstrated the possibility of an improved interpretation of observed isotope variability in terms of climate change by such isotope GCM simulations. Here, we report results of the ECHAM5 atmosphere GCM enhanced by explicit water isotope diagnosis (named ECHAM5-wiso hereafter), focussing on Antarctica. Several new climate control simulations with present-day boundary conditions have been performed to evaluate the overall capability of the ECHAM5-wiso model. For Antarctica, an increase of the model grid size from a typical coarse horizontal GCM resolution of 3.8° (T31 spectral mode) to a very fine spatial resolution of 0.75° (T159 spectral mode) results in a substantially better agreement with available present-day observations and ice core data. For both surface temperature and mean water isotope (d18O and dD) values, deviations between the ECHAM5-wiso results are on the order of 10%–15% of the related observed Antarctic values. The same is true for the simulated present-day spatial isotope-temperature relation as well as mean deuterium excess values. Using a new set of high-resolution paleoclimate simulations, we investigate if and how the Antarctic temperature-isotope relation might has changed on a glacial-interglacial time scale. Furthermore, the influence of glacial sea surface temperature changes on the deuterium excess signal in Antarctic precipitation is examined. Conference Object Antarc* Antarctic Antarctica Greenland ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
During the past two decades, several atmospheric and oceanic general circulation models (GCMs) have been enhanced by the capability to explicitly simulate the hydrological cycle of the two stable water isotopes H218O and HDO. For Greenland and Antarctic ice cores, a number of previous studies have demonstrated the possibility of an improved interpretation of observed isotope variability in terms of climate change by such isotope GCM simulations. Here, we report results of the ECHAM5 atmosphere GCM enhanced by explicit water isotope diagnosis (named ECHAM5-wiso hereafter), focussing on Antarctica. Several new climate control simulations with present-day boundary conditions have been performed to evaluate the overall capability of the ECHAM5-wiso model. For Antarctica, an increase of the model grid size from a typical coarse horizontal GCM resolution of 3.8° (T31 spectral mode) to a very fine spatial resolution of 0.75° (T159 spectral mode) results in a substantially better agreement with available present-day observations and ice core data. For both surface temperature and mean water isotope (d18O and dD) values, deviations between the ECHAM5-wiso results are on the order of 10%–15% of the related observed Antarctic values. The same is true for the simulated present-day spatial isotope-temperature relation as well as mean deuterium excess values. Using a new set of high-resolution paleoclimate simulations, we investigate if and how the Antarctic temperature-isotope relation might has changed on a glacial-interglacial time scale. Furthermore, the influence of glacial sea surface temperature changes on the deuterium excess signal in Antarctic precipitation is examined. |
format |
Conference Object |
author |
Werner, Martin Dietrich, Stephan Lohmann, Gerrit |
spellingShingle |
Werner, Martin Dietrich, Stephan Lohmann, Gerrit Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study |
author_facet |
Werner, Martin Dietrich, Stephan Lohmann, Gerrit |
author_sort |
Werner, Martin |
title |
Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study |
title_short |
Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study |
title_full |
Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study |
title_fullStr |
Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study |
title_full_unstemmed |
Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study |
title_sort |
delta o-18 and delta d changes in antarctica during the last glacial maximum - results of a new water isotope modelling study |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/31471/ http://meetingorganizer.copernicus.org/EGU2012/EGU2012-9190.pdf https://hdl.handle.net/10013/epic.40247 |
genre |
Antarc* Antarctic Antarctica Greenland ice core |
genre_facet |
Antarc* Antarctic Antarctica Greenland ice core |
op_source |
EPIC3EGU General Assembly 2012, Vienna, 2012-04-22-2012-04-27 |
op_relation |
Werner, M. orcid:0000-0002-6473-0243 , Dietrich, S. and Lohmann, G. orcid:0000-0003-2089-733X (2012) Delta O-18 and delta D changes in Antarctica during the Last Glacial Maximum - Results of a new water isotope modelling study , EGU General Assembly 2012, Vienna, 22 April 2012 - 27 April 2012 . hdl:10013/epic.40247 |
_version_ |
1810493465921847296 |