Potential impact of carbonaceous aerosol on the upper troposphere and lower stratosphere (UTLS) and precipitation during Asian summer monsoon in a global model simulation

Handle URI:
http://hdl.handle.net/10754/625856
Title:
Potential impact of carbonaceous aerosol on the upper troposphere and lower stratosphere (UTLS) and precipitation during Asian summer monsoon in a global model simulation
Authors:
Fadnavis, Suvarna; Kalita, Gayatry; Kumar, K. Ravi; Gasparini, Blaž ( 0000-0002-7177-0155 ) ; Li, Jui-Lin Frank
Abstract:
Recent satellite observations show efficient vertical transport of Asian pollutants from the surface to the upper-level anticyclone by deep monsoon convection. In this paper, we examine the transport of carbonaceous aerosols, including black carbon (BC) and organic carbon (OC), into the monsoon anticyclone using of ECHAM6-HAM, a global aerosol climate model. Further, we investigate impacts of enhanced (doubled) carbonaceous aerosol emissions on the upper troposphere and lower stratosphere (UTLS), underneath monsoon circulation and precipitation from sensitivity simulations. The model simulation shows that boundary layer aerosols are transported into the monsoon anticyclone by the strong monsoon convection from the Bay of Bengal, southern slopes of the Himalayas and the South China Sea. Doubling of emissions of both BC and OC aerosols over Southeast Asia (10° S–50° N, 65–155° E) shows that lofted aerosols produce significant warming (0.6–1 K) over the Tibetan Plateau (TP) near 400–200 hPa and instability in the middle/upper troposphere. These aerosols enhance radiative heating rates (0.02–0.03 K day−1) near the tropopause. The enhanced carbonaceous aerosols alter aerosol radiative forcing (RF) at the surface by −4.74 ± 1.42 W m−2, at the top of the atmosphere (TOA) by +0.37 ± 0.26 W m−2 and in the atmosphere by +5.11 ± 0.83 W m−2 over the TP and Indo-Gangetic Plain region (15–35° N, 80–110° E). Atmospheric warming increases vertical velocities and thereby cloud ice in the upper troposphere. Aerosol induced anomalous warming over the TP facilitates the relative strengthening of the monsoon Hadley circulation and increases moisture inflow by strengthening the cross-equatorial monsoon jet. This increases precipitation amounts over India (1–4 mm day−1) and eastern China (0.2–2 mm day−1). These results are significant at the 99 % confidence level.
KAUST Department:
King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
Citation:
Fadnavis S, Kalita G, Kumar KR, Gasparini B, Li J-LF (2017) Potential impact of carbonaceous aerosol on the upper troposphere and lower stratosphere (UTLS) and precipitation during Asian summer monsoon in a global model simulation. Atmospheric Chemistry and Physics 17: 11637–11654. Available: http://dx.doi.org/10.5194/acp-17-11637-2017.
Publisher:
Copernicus GmbH
Journal:
Atmospheric Chemistry and Physics
Issue Date:
28-Sep-2017
DOI:
10.5194/acp-17-11637-2017
Type:
Article
ISSN:
1680-7324
Sponsors:
The authors acknowledges with gratitude the High Power Computing Centre (HPC) in IITM, Pune, India, for providing computer resources. The authors are thankful to the anonymous reviewers and co-editor for valuable suggestions.
Additional Links:
https://www.atmos-chem-phys.net/17/11637/2017/
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Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorFadnavis, Suvarnaen
dc.contributor.authorKalita, Gayatryen
dc.contributor.authorKumar, K. Ravien
dc.contributor.authorGasparini, Blažen
dc.contributor.authorLi, Jui-Lin Franken
dc.date.accessioned2017-10-11T12:03:22Z-
dc.date.available2017-10-11T12:03:22Z-
dc.date.issued2017-09-28en
dc.identifier.citationFadnavis S, Kalita G, Kumar KR, Gasparini B, Li J-LF (2017) Potential impact of carbonaceous aerosol on the upper troposphere and lower stratosphere (UTLS) and precipitation during Asian summer monsoon in a global model simulation. Atmospheric Chemistry and Physics 17: 11637–11654. Available: http://dx.doi.org/10.5194/acp-17-11637-2017.en
dc.identifier.issn1680-7324en
dc.identifier.doi10.5194/acp-17-11637-2017en
dc.identifier.urihttp://hdl.handle.net/10754/625856-
dc.description.abstractRecent satellite observations show efficient vertical transport of Asian pollutants from the surface to the upper-level anticyclone by deep monsoon convection. In this paper, we examine the transport of carbonaceous aerosols, including black carbon (BC) and organic carbon (OC), into the monsoon anticyclone using of ECHAM6-HAM, a global aerosol climate model. Further, we investigate impacts of enhanced (doubled) carbonaceous aerosol emissions on the upper troposphere and lower stratosphere (UTLS), underneath monsoon circulation and precipitation from sensitivity simulations. The model simulation shows that boundary layer aerosols are transported into the monsoon anticyclone by the strong monsoon convection from the Bay of Bengal, southern slopes of the Himalayas and the South China Sea. Doubling of emissions of both BC and OC aerosols over Southeast Asia (10° S–50° N, 65–155° E) shows that lofted aerosols produce significant warming (0.6–1 K) over the Tibetan Plateau (TP) near 400–200 hPa and instability in the middle/upper troposphere. These aerosols enhance radiative heating rates (0.02–0.03 K day−1) near the tropopause. The enhanced carbonaceous aerosols alter aerosol radiative forcing (RF) at the surface by −4.74 ± 1.42 W m−2, at the top of the atmosphere (TOA) by +0.37 ± 0.26 W m−2 and in the atmosphere by +5.11 ± 0.83 W m−2 over the TP and Indo-Gangetic Plain region (15–35° N, 80–110° E). Atmospheric warming increases vertical velocities and thereby cloud ice in the upper troposphere. Aerosol induced anomalous warming over the TP facilitates the relative strengthening of the monsoon Hadley circulation and increases moisture inflow by strengthening the cross-equatorial monsoon jet. This increases precipitation amounts over India (1–4 mm day−1) and eastern China (0.2–2 mm day−1). These results are significant at the 99 % confidence level.en
dc.description.sponsorshipThe authors acknowledges with gratitude the High Power Computing Centre (HPC) in IITM, Pune, India, for providing computer resources. The authors are thankful to the anonymous reviewers and co-editor for valuable suggestions.en
dc.publisherCopernicus GmbHen
dc.relation.urlhttps://www.atmos-chem-phys.net/17/11637/2017/en
dc.rightsThis work is distributed under the Creative Commons Attribution 3.0 License.en
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/en
dc.titlePotential impact of carbonaceous aerosol on the upper troposphere and lower stratosphere (UTLS) and precipitation during Asian summer monsoon in a global model simulationen
dc.typeArticleen
dc.contributor.departmentKing Abdullah University of Science and Technology, Thuwal, Saudi Arabiaen
dc.identifier.journalAtmospheric Chemistry and Physicsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionIndian Institute of Tropical Meteorology, Pune, Indiaen
dc.contributor.institutionInstitute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerlanden
dc.contributor.institutionJet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USAen
kaust.authorKumar, K. Ravien
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