Regional simulation of anthropogenic sulfur over East Asia and its sensitivity to model parameters

Qian, Yun; Giorgi, Filippo; Huang, Yan; Chameides, W. L.; LUO, CHAO

doi:10.1034/j.1600-0889.2001.d01-14.x

Cited by 78 publications

(64 citation statements)

References 8 publications

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“…The patterns of BC and OC in the present study were consistent with those in previous studies (Qian et al, 2001(Qian et al, , 2003Zhang et al, 2009a). simulated the distributions of carbonaceous aerosols by use of coupled regional climate models and indicated that BC and OC were mainly concentrated in the Sichuan basin, the lower reaches of Yangtze River, and Shanxi Province.…”

Section: Distributions Of Aerosols Under Different Mixing Assumptionssupporting

confidence: 90%

Impacts of internally and externally mixed anthropogenic sulfate and carbonaceous aerosols on East Asian climate

2011

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A coupled regional climate and aerosol-chemistry model, RIEMS 2.0 (Regional Integrated Environmental Model System for Asia), in which anthropogenic sulfate, black carbon, and organic carbon were assumed to be externally mixed (EM), internally mixed (IM) or partially internally mixed (IEM), was used to simulate the impacts of these anthropogenic aerosols on East Asian climate for the entire year of 2006. The distributions of aerosol mass concentration, radiative forcing and hence the surface air temperature and precipitation variations under three mixing assumptions of aerosols were analyzed. The results indicated that the mass concentration of sulfate was sensitive to mixing assumptions, but carbonaceous aerosols were much less sensitive to the mixing types. Modeled results were compared with observations in a variety of sites in East Asia. It was found that the simulated concentrations of sulfate and carbonaceous aerosols were in accord with the observations in terms of magnitude. The simulated aerosol concentrations in IM case were closest to observation results. The regional average column burdens of sulfate, black carbon, and organic carbon, if internally mixed, were 11.49, 0.47, and 2.17 mg m −2 , respectively. The radiative forcing of anthropogenic aerosols at the top of the atmosphere increased from -1.27 (EM) to -1.97 W m −2 (IM) while the normalized radiative forcing (NRF) decreased from -0.145 (EM) to -0.139 W mg −1 (IM). The radiative forcing and NRF were -1.82 W m −2 and -0.141 W mg −1 for IEM, respectively. The surface air temperature changes over the domain due to the anthropogenic sulfate and carbonaceous aerosols were -0.067, -0.078, and -0.072 K, with maxima of -0.47, -0.50, and -0.49 K, for EM, IM, and IEM, respectively. Meanwhile, the annual precipitation variations were -8.0 (EM), -20.6 (IM), and -21.9 mm (IEM), with maxima of 148, 122, and 102 mm, respectively, indicating that the climate effects were stronger if the sulfate and carbonaceous aerosols were internally mixed.

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Section: Distributions Of Aerosols Under Different Mixing Assumptionssupporting

confidence: 90%

Impacts of internally and externally mixed anthropogenic sulfate and carbonaceous aerosols on East Asian climate

2011

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“…The anthropogenic aerosols include sulfate, hydrophilic, and hydrophobic components of black carbon (BC) and organic carbon (OC). The conversion of SO 2 to SO 4 via both aqueous and gaseous phase chemical processes has been described in Qian et al (2001). In total, six tracers of anthropogenic components have been configured for model simulations.…”

Section: Methodsmentioning

confidence: 99%

Direct radiative effects of anthropogenic aerosols on Indian summer monsoon circulation

Das

Dey

Dash

2015

Theor Appl Climatol

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The direct radiative impacts of anthropogenic aerosols on the dynamics of Indian summer monsoon circulation are examined using the regional climate model version 4.1 (RegCM4.1). High anthropogenic aerosol optical depth (AAOD >0.1) and surface shortwave cooling (<−6 W m −2 ) are simulated over the Indo-Gangetic Basin (IGB), northeast India, east coast of India, and its outflow to the Bay of Bengal (BoB) during the monsoon season (June to September) in the period 2001 to 2010. The analysis reveals a decrease in near surface air temperature at 2 m over the IGB and east coast of India by >0.2°C due to the dimming effect of anthropogenic aerosols. The aerosol-induced cooling leads to an increase in surface pressure over the local hotspots in the Indian landmass, which reduces the land-sea pressure contrast resulting in weakening of summer monsoon circulation. The simulated surface pressure anomaly also inhibits moisture transport from the BoB towards Indian landmass thereby enhancing precipitation over the BoB and parts of the east coast of India. The impacts are interpreted as conservative estimates because of the underestimation of AAOD by the model due to uncertainties in emission inventory and biases in simulated meteorology. Our results demonstrate the direct radiative impacts of anthropogenic aerosols on the Indian monsoon circulation and call for future studies combining the dynamical and microphysical impacts, which are not considered in this study.

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“…Anthropogenic aerosols include sulphate and hydrophilic and hydrophobic black carbon (BC) and organic carbon (OC) . The aqueous and gaseous phase chemical processes for the conversion of SO 2 to SO 4 are described in Qian et al (2001). EDGAR ) and Liousse (Junker and Liousse 2008) inventories were used for simulating suphate and carbonaceous aerosols respectively for the year 2000 at 1° × 1° resolution.…”

Section: Regcm and Experimentsmentioning

confidence: 99%

Impacts of aerosols on dynamics of Indian summer monsoon using a regional climate model

2014

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Regional simulation of anthropogenic sulfur over East Asia and its sensitivity to model parameters

Cited by 78 publications

References 8 publications

Impacts of internally and externally mixed anthropogenic sulfate and carbonaceous aerosols on East Asian climate

Impacts of internally and externally mixed anthropogenic sulfate and carbonaceous aerosols on East Asian climate

Direct radiative effects of anthropogenic aerosols on Indian summer monsoon circulation

Impacts of aerosols on dynamics of Indian summer monsoon using a regional climate model

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