Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model
To understand the validity of δ18O proxy records as indicators of past temperature change, a series of experiments was conducted using an atmospheric general circulation model fitted with water isotope tracers (Community Atmosphere Model version 3.0, IsoCAM). A pre-industrial simulation was performe...
Published in: | Climate of the Past |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2013
|
Subjects: | |
Online Access: | https://doi.org/10.5194/cp-9-789-2013 https://noa.gwlb.de/receive/cop_mods_00023107 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023062/cp-9-789-2013.pdf https://cp.copernicus.org/articles/9/789/2013/cp-9-789-2013.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00023107 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00023107 2023-05-15T16:40:23+02:00 Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model Tharammal, T. Paul, A. Merkel, U. Noone, D. 2013-03 electronic https://doi.org/10.5194/cp-9-789-2013 https://noa.gwlb.de/receive/cop_mods_00023107 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023062/cp-9-789-2013.pdf https://cp.copernicus.org/articles/9/789/2013/cp-9-789-2013.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-9-789-2013 https://noa.gwlb.de/receive/cop_mods_00023107 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023062/cp-9-789-2013.pdf https://cp.copernicus.org/articles/9/789/2013/cp-9-789-2013.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2013 ftnonlinearchiv https://doi.org/10.5194/cp-9-789-2013 2022-02-08T22:50:47Z To understand the validity of δ18O proxy records as indicators of past temperature change, a series of experiments was conducted using an atmospheric general circulation model fitted with water isotope tracers (Community Atmosphere Model version 3.0, IsoCAM). A pre-industrial simulation was performed as the control experiment, as well as a simulation with all the boundary conditions set to Last Glacial Maximum (LGM) values. Results from the pre-industrial and LGM simulations were compared to experiments in which the influence of individual boundary conditions (greenhouse gases, ice sheet albedo and topography, sea surface temperature (SST), and orbital parameters) were changed each at a time to assess their individual impact. The experiments were designed in order to analyze the spatial variations of the oxygen isotopic composition of precipitation (δ18Oprecip) in response to individual climate factors. The change in topography (due to the change in land ice cover) played a significant role in reducing the surface temperature and δ18Oprecip over North America. Exposed shelf areas and the ice sheet albedo reduced the Northern Hemisphere surface temperature and δ18Oprecip further. A global mean cooling of 4.1 °C was simulated with combined LGM boundary conditions compared to the control simulation, which was in agreement with previous experiments using the fully coupled Community Climate System Model (CCSM3). Large reductions in δ18Oprecip over the LGM ice sheets were strongly linked to the temperature decrease over them. The SST and ice sheet topography changes were responsible for most of the changes in the climate and hence the δ18Oprecip distribution among the simulations. Article in Journal/Newspaper Ice Sheet Niedersächsisches Online-Archiv NOA Climate of the Past 9 2 789 809 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Tharammal, T. Paul, A. Merkel, U. Noone, D. Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model |
topic_facet |
article Verlagsveröffentlichung |
description |
To understand the validity of δ18O proxy records as indicators of past temperature change, a series of experiments was conducted using an atmospheric general circulation model fitted with water isotope tracers (Community Atmosphere Model version 3.0, IsoCAM). A pre-industrial simulation was performed as the control experiment, as well as a simulation with all the boundary conditions set to Last Glacial Maximum (LGM) values. Results from the pre-industrial and LGM simulations were compared to experiments in which the influence of individual boundary conditions (greenhouse gases, ice sheet albedo and topography, sea surface temperature (SST), and orbital parameters) were changed each at a time to assess their individual impact. The experiments were designed in order to analyze the spatial variations of the oxygen isotopic composition of precipitation (δ18Oprecip) in response to individual climate factors. The change in topography (due to the change in land ice cover) played a significant role in reducing the surface temperature and δ18Oprecip over North America. Exposed shelf areas and the ice sheet albedo reduced the Northern Hemisphere surface temperature and δ18Oprecip further. A global mean cooling of 4.1 °C was simulated with combined LGM boundary conditions compared to the control simulation, which was in agreement with previous experiments using the fully coupled Community Climate System Model (CCSM3). Large reductions in δ18Oprecip over the LGM ice sheets were strongly linked to the temperature decrease over them. The SST and ice sheet topography changes were responsible for most of the changes in the climate and hence the δ18Oprecip distribution among the simulations. |
format |
Article in Journal/Newspaper |
author |
Tharammal, T. Paul, A. Merkel, U. Noone, D. |
author_facet |
Tharammal, T. Paul, A. Merkel, U. Noone, D. |
author_sort |
Tharammal, T. |
title |
Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model |
title_short |
Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model |
title_full |
Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model |
title_fullStr |
Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model |
title_full_unstemmed |
Influence of Last Glacial Maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model |
title_sort |
influence of last glacial maximum boundary conditions on the global water isotope distribution in an atmospheric general circulation model |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/cp-9-789-2013 https://noa.gwlb.de/receive/cop_mods_00023107 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023062/cp-9-789-2013.pdf https://cp.copernicus.org/articles/9/789/2013/cp-9-789-2013.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-9-789-2013 https://noa.gwlb.de/receive/cop_mods_00023107 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00023062/cp-9-789-2013.pdf https://cp.copernicus.org/articles/9/789/2013/cp-9-789-2013.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-9-789-2013 |
container_title |
Climate of the Past |
container_volume |
9 |
container_issue |
2 |
container_start_page |
789 |
op_container_end_page |
809 |
_version_ |
1766030780837920768 |