Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere
Atmospheric concentrations of South Asian anthropogenic aerosols and their transport play a key role in the regional hydrological cycle. Here, we use the ECHAM6-HAMMOZ chemistry–climate model to show the structure and implications of the transport pathways of these aerosols during spring (March–May)...
Published in: | Atmospheric Chemistry and Physics |
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ftfzjuelichnvdb:oai:juser.fz-juelich.de:908092 2024-09-09T19:28:26+00:00 Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere Fadnavis, Suvarna Chavan, Prashant Joshi, Akash Sonbawne, Sunil M. Acharya, Asutosh Devara, Panuganti C. S. Rap, Alexandru Ploeger, Felix Müller, Rolf DE 2022 https://juser.fz-juelich.de/record/908092 https://juser.fz-juelich.de/search?p=id:%22FZJ-2022-02371%22 eng eng EGU info:eu-repo/semantics/altIdentifier/hdl/2128/31447 info:eu-repo/semantics/altIdentifier/wos/WOS:000805224600001 info:eu-repo/semantics/altIdentifier/issn/1680-7316 info:eu-repo/semantics/altIdentifier/issn/1680-7324 info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-22-7179-2022 https://juser.fz-juelich.de/record/908092 https://juser.fz-juelich.de/search?p=id:%22FZJ-2022-02371%22 info:eu-repo/semantics/openAccess Atmospheric chemistry and physics 22(11), 7179 - 7191 (2022). doi:10.5194/acp-22-7179-2022 info:eu-repo/classification/ddc/550 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftfzjuelichnvdb https://doi.org/10.5194/acp-22-7179-2022 2024-08-05T23:55:47Z Atmospheric concentrations of South Asian anthropogenic aerosols and their transport play a key role in the regional hydrological cycle. Here, we use the ECHAM6-HAMMOZ chemistry–climate model to show the structure and implications of the transport pathways of these aerosols during spring (March–May). Our simulations indicate that large amounts of anthropogenic aerosols are transported from South Asia to the northern Indian Ocean and western Pacific. These aerosols are then lifted into the upper troposphere and lower stratosphere (UTLS) by the ascending branch of the Hadley circulation, where they enter the westerly jet. They are further transported to the Southern Hemisphere (∼15–30∘ S) and downward (320–340 K) via westerly ducts over the tropical Atlantic (5∘ S–5∘ N, 10–40∘ W) and Pacific (5∘ S–5∘ N, 95–140∘ E). The carbonaceous aerosols are also transported to the Arctic, leading to local heating (0.08–0.3 K per month, an increase by 10 %–60 %).The presence of anthropogenic aerosols causes a negative radiative forcing (RF) at the top of the atmosphere (TOA) (−0.90 ± 0.089 W m−2) and surface (−5.87 ± 0.31 W m−2) and atmospheric warming (+4.96 ± 0.24 W m−2) over South Asia (60–90∘ E, 8–23∘ N), except over the Indo-Gangetic Plain (75–83∘ E, 23–30∘ N), where RF at the TOA is positive (+1.27 ± 0.16 W m−2) due to large concentrations of absorbing aerosols. The carbonaceous aerosols lead to in-atmospheric heating along the aerosol column extending from the boundary layer to the upper troposphere (0.1 to 0.4 K per month, increase by 4 %–60 %) and in the lower stratosphere at 40–90∘ N (0.02 to 0.3 K per month, increase by 10 %–60 %). The increase in tropospheric heating due to aerosols results in an increase in water vapor concentrations, which are then transported from the northern Indian Ocean–western Pacific to the UTLS over 45–45∘ N (increasing water vapor by 1 %–10 %). Article in Journal/Newspaper Arctic Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) Arctic Indian Pacific Atmospheric Chemistry and Physics 22 11 7179 7191 |
institution |
Open Polar |
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Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) |
op_collection_id |
ftfzjuelichnvdb |
language |
English |
topic |
info:eu-repo/classification/ddc/550 |
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info:eu-repo/classification/ddc/550 Fadnavis, Suvarna Chavan, Prashant Joshi, Akash Sonbawne, Sunil M. Acharya, Asutosh Devara, Panuganti C. S. Rap, Alexandru Ploeger, Felix Müller, Rolf Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere |
topic_facet |
info:eu-repo/classification/ddc/550 |
description |
Atmospheric concentrations of South Asian anthropogenic aerosols and their transport play a key role in the regional hydrological cycle. Here, we use the ECHAM6-HAMMOZ chemistry–climate model to show the structure and implications of the transport pathways of these aerosols during spring (March–May). Our simulations indicate that large amounts of anthropogenic aerosols are transported from South Asia to the northern Indian Ocean and western Pacific. These aerosols are then lifted into the upper troposphere and lower stratosphere (UTLS) by the ascending branch of the Hadley circulation, where they enter the westerly jet. They are further transported to the Southern Hemisphere (∼15–30∘ S) and downward (320–340 K) via westerly ducts over the tropical Atlantic (5∘ S–5∘ N, 10–40∘ W) and Pacific (5∘ S–5∘ N, 95–140∘ E). The carbonaceous aerosols are also transported to the Arctic, leading to local heating (0.08–0.3 K per month, an increase by 10 %–60 %).The presence of anthropogenic aerosols causes a negative radiative forcing (RF) at the top of the atmosphere (TOA) (−0.90 ± 0.089 W m−2) and surface (−5.87 ± 0.31 W m−2) and atmospheric warming (+4.96 ± 0.24 W m−2) over South Asia (60–90∘ E, 8–23∘ N), except over the Indo-Gangetic Plain (75–83∘ E, 23–30∘ N), where RF at the TOA is positive (+1.27 ± 0.16 W m−2) due to large concentrations of absorbing aerosols. The carbonaceous aerosols lead to in-atmospheric heating along the aerosol column extending from the boundary layer to the upper troposphere (0.1 to 0.4 K per month, increase by 4 %–60 %) and in the lower stratosphere at 40–90∘ N (0.02 to 0.3 K per month, increase by 10 %–60 %). The increase in tropospheric heating due to aerosols results in an increase in water vapor concentrations, which are then transported from the northern Indian Ocean–western Pacific to the UTLS over 45–45∘ N (increasing water vapor by 1 %–10 %). |
format |
Article in Journal/Newspaper |
author |
Fadnavis, Suvarna Chavan, Prashant Joshi, Akash Sonbawne, Sunil M. Acharya, Asutosh Devara, Panuganti C. S. Rap, Alexandru Ploeger, Felix Müller, Rolf |
author_facet |
Fadnavis, Suvarna Chavan, Prashant Joshi, Akash Sonbawne, Sunil M. Acharya, Asutosh Devara, Panuganti C. S. Rap, Alexandru Ploeger, Felix Müller, Rolf |
author_sort |
Fadnavis, Suvarna |
title |
Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere |
title_short |
Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere |
title_full |
Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere |
title_fullStr |
Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere |
title_full_unstemmed |
Tropospheric warming over the northern Indian Ocean caused by South Asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere |
title_sort |
tropospheric warming over the northern indian ocean caused by south asian anthropogenic aerosols: possible impact on the upper troposphere and lower stratosphere |
publisher |
EGU |
publishDate |
2022 |
url |
https://juser.fz-juelich.de/record/908092 https://juser.fz-juelich.de/search?p=id:%22FZJ-2022-02371%22 |
op_coverage |
DE |
geographic |
Arctic Indian Pacific |
geographic_facet |
Arctic Indian Pacific |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric chemistry and physics 22(11), 7179 - 7191 (2022). doi:10.5194/acp-22-7179-2022 |
op_relation |
info:eu-repo/semantics/altIdentifier/hdl/2128/31447 info:eu-repo/semantics/altIdentifier/wos/WOS:000805224600001 info:eu-repo/semantics/altIdentifier/issn/1680-7316 info:eu-repo/semantics/altIdentifier/issn/1680-7324 info:eu-repo/semantics/altIdentifier/doi/10.5194/acp-22-7179-2022 https://juser.fz-juelich.de/record/908092 https://juser.fz-juelich.de/search?p=id:%22FZJ-2022-02371%22 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-22-7179-2022 |
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Atmospheric Chemistry and Physics |
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22 |
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11 |
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7179 |
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7191 |
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1809897716651655168 |