Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust
International audience Abstract. The composition of soil dust aerosols derives from the mineral abundances in the parent soils that vary across dust source regions. Nonetheless, Earth system models (ESMs) have traditionally represented mineral dust as a globally homogeneous species. The growing inte...
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Online Access: | https://hal.science/hal-04581282 https://hal.science/hal-04581282/document https://hal.science/hal-04581282/file/acp-24-5337-2024.pdf https://doi.org/10.5194/acp-24-5337-2024 |
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ftinsu:oai:HAL:hal-04581282v1 2024-06-23T07:45:00+00:00 Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust Obiso, Vincenzo Gonçalves Ageitos, María Pérez García-Pando, Carlos Perlwitz, Jan Schuster, Gregory Bauer, Susanne Di Biagio, Claudia Formenti, Paola Tsigaridis, Kostas Miller, Ron Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) 2024-05-07 https://hal.science/hal-04581282 https://hal.science/hal-04581282/document https://hal.science/hal-04581282/file/acp-24-5337-2024.pdf https://doi.org/10.5194/acp-24-5337-2024 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-24-5337-2024 hal-04581282 https://hal.science/hal-04581282 https://hal.science/hal-04581282/document https://hal.science/hal-04581282/file/acp-24-5337-2024.pdf doi:10.5194/acp-24-5337-2024 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-04581282 Atmospheric Chemistry and Physics, 2024, 24 (9), pp.5337-5367. ⟨10.5194/acp-24-5337-2024⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2024 ftinsu https://doi.org/10.5194/acp-24-5337-2024 2024-05-29T23:54:24Z International audience Abstract. The composition of soil dust aerosols derives from the mineral abundances in the parent soils that vary across dust source regions. Nonetheless, Earth system models (ESMs) have traditionally represented mineral dust as a globally homogeneous species. The growing interest in modeling dust mineralogy, facilitated by the recognized sensitivity of the dust climate impacts to composition, has motivated state-of-the-art ESMs to incorporate the mineral speciation of dust along with its effect upon the dust direct radiative effect (DRE). In this work, we enable the NASA Goddard Institute for Space Studies ModelE2.1 to calculate the shortwave (SW) DRE accounting for the regionally varying soil mineralogy. Mineral–radiation interaction at solar wavelengths is calculated according to two alternative coupling schemes: (1) external mixing of three mineral components that are optically distinguished, one of which contains embedded iron oxides; (2) a single internal mixture of all dust minerals with a dynamic fraction of iron oxides that varies regionally and temporally. We link dust absorption to the fractional mass of iron oxides based on recent chamber measurements using natural dust aerosol samples. We show that coupled mineralogy overall enhances the scattering by dust, and thus the global cooling, compared to our control run with globally uniform composition. According to the external mixing scheme, the SW DRE at the top of atmosphere (TOA) changes from −0.25 to -0.30Wm-2, corresponding to a change in the net DRE, including the longwave effect, from −0.08 to -0.12Wm-2. The cooling increase is accentuated when the internal mixing scheme is configured: the SW DRE at the TOA becomes -0.34Wm-2 with a net DRE of -0.15Wm-2. The varying composition modifies the regional distribution of single scattering albedo (SSA), whose variations in specific regions can be remarkable (above 0.03) and significantly modify the regional SW DRE. Evaluation against the AErosol RObotic NETwork (AERONET) shows ... Article in Journal/Newspaper Aerosol Robotic Network Institut national des sciences de l'Univers: HAL-INSU Atmospheric Chemistry and Physics 24 9 5337 5367 |
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Institut national des sciences de l'Univers: HAL-INSU |
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ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences |
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[SDE]Environmental Sciences Obiso, Vincenzo Gonçalves Ageitos, María Pérez García-Pando, Carlos Perlwitz, Jan Schuster, Gregory Bauer, Susanne Di Biagio, Claudia Formenti, Paola Tsigaridis, Kostas Miller, Ron Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract. The composition of soil dust aerosols derives from the mineral abundances in the parent soils that vary across dust source regions. Nonetheless, Earth system models (ESMs) have traditionally represented mineral dust as a globally homogeneous species. The growing interest in modeling dust mineralogy, facilitated by the recognized sensitivity of the dust climate impacts to composition, has motivated state-of-the-art ESMs to incorporate the mineral speciation of dust along with its effect upon the dust direct radiative effect (DRE). In this work, we enable the NASA Goddard Institute for Space Studies ModelE2.1 to calculate the shortwave (SW) DRE accounting for the regionally varying soil mineralogy. Mineral–radiation interaction at solar wavelengths is calculated according to two alternative coupling schemes: (1) external mixing of three mineral components that are optically distinguished, one of which contains embedded iron oxides; (2) a single internal mixture of all dust minerals with a dynamic fraction of iron oxides that varies regionally and temporally. We link dust absorption to the fractional mass of iron oxides based on recent chamber measurements using natural dust aerosol samples. We show that coupled mineralogy overall enhances the scattering by dust, and thus the global cooling, compared to our control run with globally uniform composition. According to the external mixing scheme, the SW DRE at the top of atmosphere (TOA) changes from −0.25 to -0.30Wm-2, corresponding to a change in the net DRE, including the longwave effect, from −0.08 to -0.12Wm-2. The cooling increase is accentuated when the internal mixing scheme is configured: the SW DRE at the TOA becomes -0.34Wm-2 with a net DRE of -0.15Wm-2. The varying composition modifies the regional distribution of single scattering albedo (SSA), whose variations in specific regions can be remarkable (above 0.03) and significantly modify the regional SW DRE. Evaluation against the AErosol RObotic NETwork (AERONET) shows ... |
author2 |
Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA (UMR_7583)) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) |
format |
Article in Journal/Newspaper |
author |
Obiso, Vincenzo Gonçalves Ageitos, María Pérez García-Pando, Carlos Perlwitz, Jan Schuster, Gregory Bauer, Susanne Di Biagio, Claudia Formenti, Paola Tsigaridis, Kostas Miller, Ron |
author_facet |
Obiso, Vincenzo Gonçalves Ageitos, María Pérez García-Pando, Carlos Perlwitz, Jan Schuster, Gregory Bauer, Susanne Di Biagio, Claudia Formenti, Paola Tsigaridis, Kostas Miller, Ron |
author_sort |
Obiso, Vincenzo |
title |
Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust |
title_short |
Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust |
title_full |
Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust |
title_fullStr |
Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust |
title_full_unstemmed |
Observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust |
title_sort |
observationally constrained regional variations of shortwave absorption by iron oxides emphasize the cooling effect of dust |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.science/hal-04581282 https://hal.science/hal-04581282/document https://hal.science/hal-04581282/file/acp-24-5337-2024.pdf https://doi.org/10.5194/acp-24-5337-2024 |
genre |
Aerosol Robotic Network |
genre_facet |
Aerosol Robotic Network |
op_source |
ISSN: 1680-7316 EISSN: 1680-7324 Atmospheric Chemistry and Physics https://hal.science/hal-04581282 Atmospheric Chemistry and Physics, 2024, 24 (9), pp.5337-5367. ⟨10.5194/acp-24-5337-2024⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-24-5337-2024 hal-04581282 https://hal.science/hal-04581282 https://hal.science/hal-04581282/document https://hal.science/hal-04581282/file/acp-24-5337-2024.pdf doi:10.5194/acp-24-5337-2024 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/acp-24-5337-2024 |
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Atmospheric Chemistry and Physics |
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24 |
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9 |
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5337 |
op_container_end_page |
5367 |
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