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Secondary particles formed via new particle formation (NPF)dominate cloud condensation nuclei (CCN) abundance in most parts of thetroposphere and are important for aerosol indirect radiative forcing (IRF).Laboratory measurements have shown that certain organic compounds cansignificantly enhance the binary nucleation of sulfuric acid and H2O.According to our recent study comparing particle size distributions measuredin nine forest areas in North America with those predicted by a globalsize-resolved aerosol model, current H2SO4–organics nucleationparameterizations appear to significantly overpredict NPF and particlenumber concentrations in summer. The lack of temperature dependence inthe current H2SO4–organics nucleation parameterization has beensuggested to be a possible reason for the observed overprediction. In thiswork, H2SO4–organics clustering thermodynamics fromquantum chemical studies has been employed to develop a scheme toincorporate temperature dependence into H2SO4–organics nucleationparameterization. We show that temperature has a strong impact onH2SO4–organics nucleation rates and may reduce the nucleation rate by ∼  1 order of magnitude per 10 K of temperature increase.The particle number concentrations in summer over North America based on therevised scheme is a factor of more than 2 lower, which is in much better agreementwith the observations. With the temperature-dependentH2SO4–organics nucleation parameterization, the summer CCNconcentrations in the lower troposphere in the Northern Hemisphere are about10–30 % lower compared to the temperature-independent parameterization. This studyhighlights the importance of the temperature effect and its impacts on NPFin the global modeling of aerosol number abundance

Impact of temperature dependence on the possible contribution of organics to new particle formation in the atmosphere