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Fadnavis, S, Roy, C, Chattopadhyay, R et al. (5 more authors) (2018) Transport of trace gases via eddy shedding from the Asian summer monsoon anticyclone and associated impacts on ozone heating rates. Atmospheric Chemistry and Physics, 18 (15). pp. 11493-11506. ISSN 1680-7316
Abstract
The highly vibrant Asian summer monsoon (ASM) anticyclone plays an important role in efficient transport of Asian tropospheric air masses to the extratropical upper troposphere and lower stratosphere (UTLS). In this paper, we demonstrate long-range transport of Asian trace gases via eddy-shedding events using MIPAS (Michelson Interferometer for Passive Atmospheric Sounding) satellite observations, ERA-Interim reanalysis data and the ECHAM5–HAMMOZ global chemistry-climate model. Model simulations and observations consistently show that Asian boundary layer trace gases are lifted to UTLS altitudes in the monsoon anticyclone and are further transported horizontally eastward and westward by eddies detached from the anticyclone. We present an event of eddy shedding during 1–8 July 2003 and discuss a 1995–2016 climatology of eddy-shedding events. Our analysis indicates that eddies detached from the anticyclone contribute to the transport of Asian trace gases away from the Asian region to the western Pacific (20–30°N, 120–150°E) and western Africa (20–30°N, 0–30°E). Over the last two decades, the estimated frequency of occurrence of eddy-shedding events is ∼ 68% towards western Africa and ∼ 25% towards the western Pacific.
Model sensitivity experiments considering a 10% reduction in Asian emissions of non-methane volatile organic compounds (NMVOCs) and nitrogen oxides (NOx) were performed with ECHAM5–HAMMOZ to understand the impact of Asian emissions on the UTLS. The model simulations show that transport of Asian emissions due to eddy shedding significantly affects the chemical composition of the upper troposphere ( ∼ 100–400hPa) and lower stratosphere ( ∼ 100–80hPa) over western Africa and the western Pacific. The 10% reduction of NMVOCs and NOx Asian emissions leads to decreases in peroxyacetyl nitrate (PAN) (2%–10% near 200–80hPa), ozone (1%–4.5% near ∼ 150hPa) and ozone heating rates (0.001–0.004Kday−1 near 300–150hPa) in the upper troposphere over western Africa and the western Pacific.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Author(s) 2018. This work is distributed under the Creative Commons Attribution 4.0 License. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst for Climate & Atmos Science (ICAS) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Sep 2018 14:42 |
Last Modified: | 03 Sep 2018 14:42 |
Status: | Published |
Publisher: | Copernicus Publications |
Identification Number: | 10.5194/acp-18-11493-2018 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135186 |
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Transport of trace gases via eddy shedding from the Asian summer monsoon anticyclone and associated impacts on ozone heating rates. (deposited 29 Aug 2018 16:04)
- Transport of trace gases via eddy shedding from the Asian summer monsoon anticyclone and associated impacts on ozone heating rates. (deposited 03 Sep 2018 14:42) [Currently Displayed]