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DOI | 10.5194/acp-19-9989-2019 |
The impact of recent changes in Asian anthropogenic emissions of SO2 on sulfate loading in the upper troposphere and lower stratosphere and the associated radiative changes | |
Fadnavis S.; Müller R.; Kalita G.; Rowlinson M.; Rap A.; Li J.-L.F.; Gasparini B.; Laakso A. | |
发表日期 | 2019 |
ISSN | 16807316 |
起始页码 | 9989 |
结束页码 | 10008 |
卷号 | 19期号:15 |
英文摘要 | Convective transport plays a key role in aerosol enhancement in the upper troposphere and lower stratosphere (UTLS) over the Asian monsoon region where low-level convective instability persists throughout the year. We use the state-of-the-art ECHAM6-HAMMOZ global chemistry- climate model to investigate the seasonal transport of anthropogenic Asian sulfate aerosols and their impact on the UTLS. Sensitivity simulations for SO2 emission perturbation over India (48% increase) and China (70% decrease) are performed based on the Ozone Monitoring Instrument (OMI) satellite-observed trend, rising over India by - 4:8% per year and decreasing over China by - 7:0% per year during 2006-2017. The enhanced Indian emissions result in an increase in aerosol optical depth (AOD) loading in the UTLS by 0.61 to 4.17% over India. These aerosols are transported to the Arctic during all seasons by the lower branch of the Brewer-Dobson circulation enhancing AOD by 0.017% to 4.8 %. Interestingly, a reduction in SO2 emission over China inhibits the transport of Indian sulfate aerosols to the Arctic in summer-monsoon and post-monsoon seasons due to subsidence over northern India. The region of sulfate aerosol enhancement shows significant warming in the UTLS over northern India, south China (0:2±0:15 to 0:8±0:72 K) and the Arctic (- 1±0:62 to 1:6±1:07 K). The estimated seasonal mean direct radiative forcing at the top of the atmosphere (TOA) induced by the increase in Indian SO2 emission is-0.2 to-1.5Wm-2 over northern India. The Chinese SO2 emission reduction leads to a positive radiative forcing of - 0:6 to 6Wm-2 over China. The decrease in vertical velocity and the associated enhanced stability of the upper troposphere in response to increased Indian SO2 emissions will likely decrease rainfall over India. © Author(s) 2019. |
语种 | 英语 |
scopus关键词 | aerosol; anthropogenic effect; atmospheric convection; monsoon; stratosphere-troposphere interaction; sulfate; sulfur dioxide; Asia |
来源期刊 | Atmospheric Chemistry and Physics |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/144222 |
作者单位 | Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India; Forschungszentrum Jülich GmbH, IEK7, Jülich, Germany; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Atmospheric Sciences, University of Washington, Seattle, United States; Finnish Meteorological Institute, Kuopio, Finland |
推荐引用方式 GB/T 7714 | Fadnavis S.,Müller R.,Kalita G.,et al. The impact of recent changes in Asian anthropogenic emissions of SO2 on sulfate loading in the upper troposphere and lower stratosphere and the associated radiative changes[J],2019,19(15). |
APA | Fadnavis S..,Müller R..,Kalita G..,Rowlinson M..,Rap A..,...&Laakso A..(2019).The impact of recent changes in Asian anthropogenic emissions of SO2 on sulfate loading in the upper troposphere and lower stratosphere and the associated radiative changes.Atmospheric Chemistry and Physics,19(15). |
MLA | Fadnavis S.,et al."The impact of recent changes in Asian anthropogenic emissions of SO2 on sulfate loading in the upper troposphere and lower stratosphere and the associated radiative changes".Atmospheric Chemistry and Physics 19.15(2019). |
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