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• W4236384217 abstract "Abstract. This study examines the effect of a typical pre-monsoon season dust storm on tropospheric chemistry through a case study in northern India. Dust can alter photolysis rates by scattering and absorbing solar radiation, and provide surface area for heterogeneous reactions. We use the Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) to simulate the dust storm that occurred during 17–22 April 2010 and investigate the contribution of different processes on mixing ratios of several key trace gases including ozone, nitrogen oxides, hydrogen oxides, methanol, acetic acid and formaldehyde. We revised the Fast Troposphere Ultraviolet Visible (F-TUV) photolysis scheme to include effects of dust aerosols on photolysis rates in a manner consistent with the calculations of aerosol optical properties for feedback to the meteorology radiation schemes. In addition, we added twelve heterogeneous reactions on the dust surface, for which six reactions have relative humidity dependent reactive uptake coefficients (γ). The inclusion of these processes in WRF-Chem is found to reduce difference between observed and modeled ozone from 16 ± 9 to 2 ± 8 ppbv and that in NOy from 2129 ± 1425 to 372 ± 1225 pptv compared to measurements at the high altitude site Nainital in the central Himalayas, and reduce biases by up to 30% in tropospheric column NO2 compared to OMI retrievals. The simulated dust storm acted as a sink for all the trace gases examined here and significantly perturbed their spatial and vertical distributions. The reductions in these gases are estimated as 5–100% and more than 80% of this reduction was due to heterogeneous chemistry. The RH dependence of γ is also found to have substantial impact on the distribution of trace gases, with changes of up to 20–25% in ozone and HO2, 50% in H2O2 and 100% in HNO3. A set of sensitivity analyses revealed that dust aging can reduce the uptake of trace gases (especially of H2O2 and acetic acid) by up to 50% in dust source regions." @default.
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• W4236384217 date "2014-01-14" @default.
• W4236384217 modified "2023-09-29" @default.
• W4236384217 title "Effects of dust aerosols on tropospheric chemistry during a typical pre-monsoon season dust storm in northern India" @default.
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• W4236384217 doi "https://doi.org/10.5194/acpd-14-1113-2014" @default.
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