Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3
Mineral dust aerosol constitutes an important component of the Earth's climate system, not only on short timescales due to direct and indirect influences on the radiation budget but also on long timescales by acting as a fertilizer for the biosphere and thus affecting the global carbon cycle. F...
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Copernicus Publications
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fttriple:oai:gotriple.eu:oai:doaj.org/article:8c1c400edb4343889b53eaf5a40c0e76 2023-05-15T13:40:23+02:00 Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3 S. Krätschmer M. van der Does F. Lamy G. Lohmann C. Völker M. Werner 2022-01-01 https://doi.org/10.5194/cp-18-67-2022 https://cp.copernicus.org/articles/18/67/2022/cp-18-67-2022.pdf https://doaj.org/article/8c1c400edb4343889b53eaf5a40c0e76 en eng Copernicus Publications doi:10.5194/cp-18-67-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/67/2022/cp-18-67-2022.pdf https://doaj.org/article/8c1c400edb4343889b53eaf5a40c0e76 undefined Climate of the Past, Vol 18, Pp 67-87 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/cp-18-67-2022 2023-01-22T18:59:38Z Mineral dust aerosol constitutes an important component of the Earth's climate system, not only on short timescales due to direct and indirect influences on the radiation budget but also on long timescales by acting as a fertilizer for the biosphere and thus affecting the global carbon cycle. For a quantitative assessment of its impact on the global climate, state-of-the-art atmospheric and aerosol models can be utilized. In this study, we use the ECHAM6.3-HAM2.3 model to perform global simulations of the mineral dust cycle for present-day (PD), pre-industrial (PI), and last glacial maximum (LGM) climate conditions. The intercomparison with marine sediment and ice core data, as well as other modeling studies, shows that the obtained annual dust emissions of 1221, 923, and 5159 Tg for PD, PI, and LGM, respectively, generally agree well with previous findings. Our analyses focusing on the Southern Hemisphere suggest that over 90 % of the mineral dust deposited over Antarctica are of Australian or South American origin during both PI and LGM. However, contrary to previous studies, we find that Australia contributes a higher proportion during the LGM, which is mainly caused by changes in the precipitation patterns. Obtained increased particle radii during the LGM can be traced back to increased sulfate condensation on the particle surfaces as a consequence of longer particle lifetimes. The meridional transport of mineral dust from its source regions to the South Pole takes place at different altitudes depending on the grain size of the dust particles. We find a trend of generally lower transport heights during the LGM compared to PI as a consequence of reduced convection due to colder surfaces, indicating a vertically less extensive Polar cell. Article in Journal/Newspaper Antarc* Antarctica ice core South pole South pole Unknown South Pole Climate of the Past 18 1 67 87 |
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language |
English |
topic |
geo envir |
spellingShingle |
geo envir S. Krätschmer M. van der Does F. Lamy G. Lohmann C. Völker M. Werner Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3 |
topic_facet |
geo envir |
description |
Mineral dust aerosol constitutes an important component of the Earth's climate system, not only on short timescales due to direct and indirect influences on the radiation budget but also on long timescales by acting as a fertilizer for the biosphere and thus affecting the global carbon cycle. For a quantitative assessment of its impact on the global climate, state-of-the-art atmospheric and aerosol models can be utilized. In this study, we use the ECHAM6.3-HAM2.3 model to perform global simulations of the mineral dust cycle for present-day (PD), pre-industrial (PI), and last glacial maximum (LGM) climate conditions. The intercomparison with marine sediment and ice core data, as well as other modeling studies, shows that the obtained annual dust emissions of 1221, 923, and 5159 Tg for PD, PI, and LGM, respectively, generally agree well with previous findings. Our analyses focusing on the Southern Hemisphere suggest that over 90 % of the mineral dust deposited over Antarctica are of Australian or South American origin during both PI and LGM. However, contrary to previous studies, we find that Australia contributes a higher proportion during the LGM, which is mainly caused by changes in the precipitation patterns. Obtained increased particle radii during the LGM can be traced back to increased sulfate condensation on the particle surfaces as a consequence of longer particle lifetimes. The meridional transport of mineral dust from its source regions to the South Pole takes place at different altitudes depending on the grain size of the dust particles. We find a trend of generally lower transport heights during the LGM compared to PI as a consequence of reduced convection due to colder surfaces, indicating a vertically less extensive Polar cell. |
format |
Article in Journal/Newspaper |
author |
S. Krätschmer M. van der Does F. Lamy G. Lohmann C. Völker M. Werner |
author_facet |
S. Krätschmer M. van der Does F. Lamy G. Lohmann C. Völker M. Werner |
author_sort |
S. Krätschmer |
title |
Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3 |
title_short |
Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3 |
title_full |
Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3 |
title_fullStr |
Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3 |
title_full_unstemmed |
Simulating glacial dust changes in the Southern Hemisphere using ECHAM6.3-HAM2.3 |
title_sort |
simulating glacial dust changes in the southern hemisphere using echam6.3-ham2.3 |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-67-2022 https://cp.copernicus.org/articles/18/67/2022/cp-18-67-2022.pdf https://doaj.org/article/8c1c400edb4343889b53eaf5a40c0e76 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
Antarc* Antarctica ice core South pole South pole |
genre_facet |
Antarc* Antarctica ice core South pole South pole |
op_source |
Climate of the Past, Vol 18, Pp 67-87 (2022) |
op_relation |
doi:10.5194/cp-18-67-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/67/2022/cp-18-67-2022.pdf https://doaj.org/article/8c1c400edb4343889b53eaf5a40c0e76 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-18-67-2022 |
container_title |
Climate of the Past |
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18 |
container_issue |
1 |
container_start_page |
67 |
op_container_end_page |
87 |
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