Understanding the Contribution of Ozone Changes in the Historical Sea Level Change
Changes in sea level are mostly driven by internal climate variability, and anthropogenic forcing. Moreover, changes in stratospheric and tropospheric Ozone during the second-half of the 20th century also cause significant changes in ocean heat uptake. A recent study has shown that both stratospheri...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5018904 2023-10-01T03:51:58+02:00 Understanding the Contribution of Ozone Changes in the Historical Sea Level Change Rathore, S. Church, J. Zika, J. Zhang, X. Sohail, T. 2023 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018904 eng eng info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-2976 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018904 XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) info:eu-repo/semantics/conferenceObject 2023 ftgfzpotsdam https://doi.org/10.57757/IUGG23-2976 2023-09-03T23:42:28Z Changes in sea level are mostly driven by internal climate variability, and anthropogenic forcing. Moreover, changes in stratospheric and tropospheric Ozone during the second-half of the 20th century also cause significant changes in ocean heat uptake. A recent study has shown that both stratospheric and tropospheric ozone have contributed to the Southern Ocean warming in the deep ocean. This study has shown that the 30% of Southern Ocean warming during 1955-2000 is driven by ozone in the upper 2000 m of the ocean. Of this 30%, 60% is attributed to stratospheric and 40% to tropospheric ozone changes. Changes in ocean heat uptake consequently affect sea level and we assess these changes due to ozone. From the analysis of four CMIP6 models with a total of 28 ensemble members, we find that thermosteric sea level increases between 40-60 S and decreases between 60 S and the Antarctic peninsula. Hence, there is a gradient in thermosteric sea level established around 60 S with higher sea level on the equatorward side and lower sea level on the poleward side. The increased sea level in the Southern Ocean is plausibly related to an increase in the strength of westerlies due to ozone forcing that has helped to deposit more heat due to the intense churning of the subtropical gyres. Further investigations are required to quantify the changes in sea level due to ozone in comparison to aerosols, greenhouse gases, and their combination (i.e., historical trend) to explain the observed sea level changes. Conference Object Antarc* Antarctic Antarctic Peninsula Southern Ocean GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Southern Ocean The Antarctic Antarctic Peninsula |
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Open Polar |
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GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
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ftgfzpotsdam |
language |
English |
description |
Changes in sea level are mostly driven by internal climate variability, and anthropogenic forcing. Moreover, changes in stratospheric and tropospheric Ozone during the second-half of the 20th century also cause significant changes in ocean heat uptake. A recent study has shown that both stratospheric and tropospheric ozone have contributed to the Southern Ocean warming in the deep ocean. This study has shown that the 30% of Southern Ocean warming during 1955-2000 is driven by ozone in the upper 2000 m of the ocean. Of this 30%, 60% is attributed to stratospheric and 40% to tropospheric ozone changes. Changes in ocean heat uptake consequently affect sea level and we assess these changes due to ozone. From the analysis of four CMIP6 models with a total of 28 ensemble members, we find that thermosteric sea level increases between 40-60 S and decreases between 60 S and the Antarctic peninsula. Hence, there is a gradient in thermosteric sea level established around 60 S with higher sea level on the equatorward side and lower sea level on the poleward side. The increased sea level in the Southern Ocean is plausibly related to an increase in the strength of westerlies due to ozone forcing that has helped to deposit more heat due to the intense churning of the subtropical gyres. Further investigations are required to quantify the changes in sea level due to ozone in comparison to aerosols, greenhouse gases, and their combination (i.e., historical trend) to explain the observed sea level changes. |
format |
Conference Object |
author |
Rathore, S. Church, J. Zika, J. Zhang, X. Sohail, T. |
spellingShingle |
Rathore, S. Church, J. Zika, J. Zhang, X. Sohail, T. Understanding the Contribution of Ozone Changes in the Historical Sea Level Change |
author_facet |
Rathore, S. Church, J. Zika, J. Zhang, X. Sohail, T. |
author_sort |
Rathore, S. |
title |
Understanding the Contribution of Ozone Changes in the Historical Sea Level Change |
title_short |
Understanding the Contribution of Ozone Changes in the Historical Sea Level Change |
title_full |
Understanding the Contribution of Ozone Changes in the Historical Sea Level Change |
title_fullStr |
Understanding the Contribution of Ozone Changes in the Historical Sea Level Change |
title_full_unstemmed |
Understanding the Contribution of Ozone Changes in the Historical Sea Level Change |
title_sort |
understanding the contribution of ozone changes in the historical sea level change |
publishDate |
2023 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018904 |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Southern Ocean |
op_source |
XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.57757/IUGG23-2976 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018904 |
op_doi |
https://doi.org/10.57757/IUGG23-2976 |
_version_ |
1778517371874443264 |