The polar amplification asymmetry: role of Antarctic surface height
Previous studies have attributed an overall weaker (or slower) polar amplification in Antarctica compared to the Arctic to a weaker Antarctic surface albedo feedback and also to more efficient ocean heat uptake in the Southern Ocean in combination with Antarctic ozone depletion. Here, the role of th...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00010059 2023-05-15T13:11:41+02:00 The polar amplification asymmetry: role of Antarctic surface height Salzmann, Marc 2017-05 electronic https://doi.org/10.5194/esd-8-323-2017 https://noa.gwlb.de/receive/cop_mods_00010059 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010016/esd-8-323-2017.pdf https://esd.copernicus.org/articles/8/323/2017/esd-8-323-2017.pdf eng eng Copernicus Publications Earth System Dynamics -- http://www.earth-syst-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2578793 -- 2190-4987 https://doi.org/10.5194/esd-8-323-2017 https://noa.gwlb.de/receive/cop_mods_00010059 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010016/esd-8-323-2017.pdf https://esd.copernicus.org/articles/8/323/2017/esd-8-323-2017.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2017 ftnonlinearchiv https://doi.org/10.5194/esd-8-323-2017 2022-02-08T22:57:16Z Previous studies have attributed an overall weaker (or slower) polar amplification in Antarctica compared to the Arctic to a weaker Antarctic surface albedo feedback and also to more efficient ocean heat uptake in the Southern Ocean in combination with Antarctic ozone depletion. Here, the role of the Antarctic surface height for meridional heat transport and local radiative feedbacks, including the surface albedo feedback, was investigated based on CO2-doubling experiments in a low-resolution coupled climate model. When Antarctica was assumed to be flat, the north–south asymmetry of the zonal mean top of the atmosphere radiation budget was notably reduced. Doubling CO2 in a flat Antarctica (flat AA) model setup led to a stronger increase in southern hemispheric poleward atmospheric and oceanic heat transport compared to the base model setup. Based on partial radiative perturbation (PRP) computations, it was shown that local radiative feedbacks and an increase in the CO2 forcing in the deeper atmospheric column also contributed to stronger Antarctic warming in the flat AA model setup, and the roles of the individual radiative feedbacks are discussed in some detail. A considerable fraction (between 24 and 80 % for three consecutive 25-year time slices starting in year 51 and ending in year 126 after CO2 doubling) of the polar amplification asymmetry was explained by the difference in surface height, but the fraction was subject to transient changes and might to some extent also depend on model uncertainties. In order to arrive at a more reliable estimate of the role of land height for the observed polar amplification asymmetry, additional studies based on ensemble runs from higher-resolution models and an improved model setup with a more realistic gradual increase in the CO2 concentration are required. Article in Journal/Newspaper albedo Antarc* Antarctic Antarctica Arctic Southern Ocean Niedersächsisches Online-Archiv NOA Antarctic Arctic Southern Ocean The Antarctic Earth System Dynamics 8 2 323 336 |
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article Verlagsveröffentlichung Salzmann, Marc The polar amplification asymmetry: role of Antarctic surface height |
topic_facet |
article Verlagsveröffentlichung |
description |
Previous studies have attributed an overall weaker (or slower) polar amplification in Antarctica compared to the Arctic to a weaker Antarctic surface albedo feedback and also to more efficient ocean heat uptake in the Southern Ocean in combination with Antarctic ozone depletion. Here, the role of the Antarctic surface height for meridional heat transport and local radiative feedbacks, including the surface albedo feedback, was investigated based on CO2-doubling experiments in a low-resolution coupled climate model. When Antarctica was assumed to be flat, the north–south asymmetry of the zonal mean top of the atmosphere radiation budget was notably reduced. Doubling CO2 in a flat Antarctica (flat AA) model setup led to a stronger increase in southern hemispheric poleward atmospheric and oceanic heat transport compared to the base model setup. Based on partial radiative perturbation (PRP) computations, it was shown that local radiative feedbacks and an increase in the CO2 forcing in the deeper atmospheric column also contributed to stronger Antarctic warming in the flat AA model setup, and the roles of the individual radiative feedbacks are discussed in some detail. A considerable fraction (between 24 and 80 % for three consecutive 25-year time slices starting in year 51 and ending in year 126 after CO2 doubling) of the polar amplification asymmetry was explained by the difference in surface height, but the fraction was subject to transient changes and might to some extent also depend on model uncertainties. In order to arrive at a more reliable estimate of the role of land height for the observed polar amplification asymmetry, additional studies based on ensemble runs from higher-resolution models and an improved model setup with a more realistic gradual increase in the CO2 concentration are required. |
format |
Article in Journal/Newspaper |
author |
Salzmann, Marc |
author_facet |
Salzmann, Marc |
author_sort |
Salzmann, Marc |
title |
The polar amplification asymmetry: role of Antarctic surface height |
title_short |
The polar amplification asymmetry: role of Antarctic surface height |
title_full |
The polar amplification asymmetry: role of Antarctic surface height |
title_fullStr |
The polar amplification asymmetry: role of Antarctic surface height |
title_full_unstemmed |
The polar amplification asymmetry: role of Antarctic surface height |
title_sort |
polar amplification asymmetry: role of antarctic surface height |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/esd-8-323-2017 https://noa.gwlb.de/receive/cop_mods_00010059 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010016/esd-8-323-2017.pdf https://esd.copernicus.org/articles/8/323/2017/esd-8-323-2017.pdf |
geographic |
Antarctic Arctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Arctic Southern Ocean The Antarctic |
genre |
albedo Antarc* Antarctic Antarctica Arctic Southern Ocean |
genre_facet |
albedo Antarc* Antarctic Antarctica Arctic Southern Ocean |
op_relation |
Earth System Dynamics -- http://www.earth-syst-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2578793 -- 2190-4987 https://doi.org/10.5194/esd-8-323-2017 https://noa.gwlb.de/receive/cop_mods_00010059 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00010016/esd-8-323-2017.pdf https://esd.copernicus.org/articles/8/323/2017/esd-8-323-2017.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/esd-8-323-2017 |
container_title |
Earth System Dynamics |
container_volume |
8 |
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2 |
container_start_page |
323 |
op_container_end_page |
336 |
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1766248566733406208 |