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000864733 1001_ $$00000-0003-4442-0755$$aFadnavis, Suvarna$$b0$$eCorresponding author
000864733 245__ $$aThe impact of recent changes in Asian anthropogenic emissions of SO<sub>2</sub> on sulfate loading in the upper troposphere and lower stratosphere and the associated radiative changes
000864733 260__ $$aKatlenburg-Lindau$$bEGU$$c2019
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000864733 520__ $$aConvective transport plays a key role in aerosol enhancement in the upper troposphere and lower stratosphere (UTLS) over the Asian monsoon region where low-level convective instability persists throughout the year. We use the state-of-the-art ECHAM6–HAMMOZ global chemistry–climate model to investigate the seasonal transport of anthropogenic Asian sulfate aerosols and their impact on the UTLS. Sensitivity simulations for SO2 emission perturbation over India (48 % increase) and China (70 % decrease) are performed based on the Ozone Monitoring Instrument (OMI) satellite-observed trend, rising over India by ∼4.8 % per year and decreasing over China by ∼7.0 % per year during 2006–2017. The enhanced Indian emissions result in an increase in aerosol optical depth (AOD) loading in the UTLS by 0.61 to 4.17 % over India. These aerosols are transported to the Arctic during all seasons by the lower branch of the Brewer–Dobson circulation enhancing AOD by 0.017 % to 4.8 %. Interestingly, a reduction in SO2 emission over China inhibits the transport of Indian sulfate aerosols to the Arctic in summer-monsoon and post-monsoon seasons due to subsidence over northern India. The region of sulfate aerosol enhancement shows significant warming in the UTLS over northern India, south China (0.2±0.15 to 0.8±0.72 K) and the Arctic (∼1±0.62 to 1.6±1.07 K). The estimated seasonal mean direct radiative forcing at the top of the atmosphere (TOA) induced by the increase in Indian SO2 emission is −0.2 to −1.5 W m−2 over northern India. The Chinese SO2 emission reduction leads to a positive radiative forcing of ∼0.6 to 6 W m−2 over China. The decrease in vertical velocity and the associated enhanced stability of the upper troposphere in response to increased Indian SO2 emissions will likely decrease rainfall over India.
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000864733 7001_ $$0P:(DE-Juel1)129138$$aMüller, Rolf$$b1
000864733 7001_ $$0P:(DE-HGF)0$$aKalita, Gayatry$$b2
000864733 7001_ $$0P:(DE-HGF)0$$aRowlinson, Matthew$$b3
000864733 7001_ $$00000-0002-2319-6769$$aRap, Alexandru$$b4
000864733 7001_ $$00000-0002-1294-9526$$aLi, Jui-Lin Frank$$b5
000864733 7001_ $$00000-0002-7177-0155$$aGasparini, Blaž$$b6
000864733 7001_ $$0P:(DE-HGF)0$$aLaakso, Anton$$b7
000864733 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-19-9989-2019$$gVol. 19, no. 15, p. 9989 - 10008$$n15$$p9989 - 10008$$tAtmospheric chemistry and physics$$v19$$x1680-7324$$y2019
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