Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere
This thesis investigates the changes in the atmospheric and oceanic circulation in the Southern Hemisphere driven by the increase in anthropogenic greenhouse gases and by changes in stratospheric ozone during the second half of the twentieth century and the twenty-first century. The effect of the me...
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ftunivkiel:oai:macau.uni-kiel.de:macau_mods_00003286 2024-06-23T07:46:39+00:00 Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere Ivanciu, Ioana Matthes, Katja Latif, Mojib Biastoch, Arne 2022 https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2022-00836-0 https://macau.uni-kiel.de/receive/macau_mods_00003286 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00004453/Doctoral_thesis_Ioana_Ivanciu.pdf eng eng https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2022-00836-0 https://macau.uni-kiel.de/receive/macau_mods_00003286 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00004453/Doctoral_thesis_Ioana_Ivanciu.pdf https://creativecommons.org/licenses/by-nc/4.0/ info:eu-repo/semantics/openAccess thesis ddc:550 climate change stratospheric ozone Brewer-Dobson Circulation Southern Hemisphere westerlies Southern Ocean Agulhas Current System South African precipitation ridging highs Rossby wave breaking dissertation Text doc-type:PhDThesis 2022 ftunivkiel 2024-06-12T14:18:24Z This thesis investigates the changes in the atmospheric and oceanic circulation in the Southern Hemisphere driven by the increase in anthropogenic greenhouse gases and by changes in stratospheric ozone during the second half of the twentieth century and the twenty-first century. The effect of the method used to account for ozone changes in coupled climate models on the results is additionally investigated. It is found that in the past, the formation of the Antarctic ozone hole is the main driver of dynamical changes in the Southern Hemisphere, such as the acceleration of the Brewer-Dobson Circulation and the strengthening and poleward shift of the tropospheric westerlies. In the future, ozone recovery and the increase in greenhouse gases following the high emission scenario SSP585 drive changes of opposite sign, with the effect of greenhouse gases dominating. However, ozone recovery mitigates the impact of the increase in greenhouse gases on the westerly winds, the Agulhas leakage and the Southern Ocean sea surface temperature. In the stratosphere, changes of similar magnitude were found due to ozone recovery and increasing greenhouse gases in the future. The increase in greenhouse gases leads to a planetary wavenumber 1 response in austral spring and, surprisingly, to a weakening of the Brewer-Dobson Circulation. This contrast the strengthening of the Brewer-Dobson Circulation that occurs during the rest of the year due to greenhouse gases. Greenhouse gases dominate the changes in precipitation over South Africa associated with ridging highs in the future. Ridging highs were categorized based on whether they are accompanied by Rossby wave breaking aloft or not and it was found that Rossby wave breaking mediates the impact of the increase in greenhouse gases on ridging highs and the amount of precipitation they contribute over South Africa. Doctoral or Postdoctoral Thesis Antarc* Antarctic Southern Ocean MACAU: Open Access Repository of Kiel University Antarctic Southern Ocean The Antarctic Austral |
institution |
Open Polar |
collection |
MACAU: Open Access Repository of Kiel University |
op_collection_id |
ftunivkiel |
language |
English |
topic |
thesis ddc:550 climate change stratospheric ozone Brewer-Dobson Circulation Southern Hemisphere westerlies Southern Ocean Agulhas Current System South African precipitation ridging highs Rossby wave breaking |
spellingShingle |
thesis ddc:550 climate change stratospheric ozone Brewer-Dobson Circulation Southern Hemisphere westerlies Southern Ocean Agulhas Current System South African precipitation ridging highs Rossby wave breaking Ivanciu, Ioana Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere |
topic_facet |
thesis ddc:550 climate change stratospheric ozone Brewer-Dobson Circulation Southern Hemisphere westerlies Southern Ocean Agulhas Current System South African precipitation ridging highs Rossby wave breaking |
description |
This thesis investigates the changes in the atmospheric and oceanic circulation in the Southern Hemisphere driven by the increase in anthropogenic greenhouse gases and by changes in stratospheric ozone during the second half of the twentieth century and the twenty-first century. The effect of the method used to account for ozone changes in coupled climate models on the results is additionally investigated. It is found that in the past, the formation of the Antarctic ozone hole is the main driver of dynamical changes in the Southern Hemisphere, such as the acceleration of the Brewer-Dobson Circulation and the strengthening and poleward shift of the tropospheric westerlies. In the future, ozone recovery and the increase in greenhouse gases following the high emission scenario SSP585 drive changes of opposite sign, with the effect of greenhouse gases dominating. However, ozone recovery mitigates the impact of the increase in greenhouse gases on the westerly winds, the Agulhas leakage and the Southern Ocean sea surface temperature. In the stratosphere, changes of similar magnitude were found due to ozone recovery and increasing greenhouse gases in the future. The increase in greenhouse gases leads to a planetary wavenumber 1 response in austral spring and, surprisingly, to a weakening of the Brewer-Dobson Circulation. This contrast the strengthening of the Brewer-Dobson Circulation that occurs during the rest of the year due to greenhouse gases. Greenhouse gases dominate the changes in precipitation over South Africa associated with ridging highs in the future. Ridging highs were categorized based on whether they are accompanied by Rossby wave breaking aloft or not and it was found that Rossby wave breaking mediates the impact of the increase in greenhouse gases on ridging highs and the amount of precipitation they contribute over South Africa. |
author2 |
Matthes, Katja Latif, Mojib Biastoch, Arne |
format |
Doctoral or Postdoctoral Thesis |
author |
Ivanciu, Ioana |
author_facet |
Ivanciu, Ioana |
author_sort |
Ivanciu, Ioana |
title |
Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere |
title_short |
Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere |
title_full |
Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere |
title_fullStr |
Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere |
title_full_unstemmed |
Impacts of Increasing Greenhouse Gas Concentrations and of Ozone Changes on the Atmospheric and Oceanic Circulation in the Southern Hemisphere |
title_sort |
impacts of increasing greenhouse gas concentrations and of ozone changes on the atmospheric and oceanic circulation in the southern hemisphere |
publishDate |
2022 |
url |
https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2022-00836-0 https://macau.uni-kiel.de/receive/macau_mods_00003286 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00004453/Doctoral_thesis_Ioana_Ivanciu.pdf |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://nbn-resolving.org/urn:nbn:de:gbv:8:3-2022-00836-0 https://macau.uni-kiel.de/receive/macau_mods_00003286 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/macau_derivate_00004453/Doctoral_thesis_Ioana_Ivanciu.pdf |
op_rights |
https://creativecommons.org/licenses/by-nc/4.0/ info:eu-repo/semantics/openAccess |
_version_ |
1802647274667376640 |