A novel method to generate CaCO3 aerosol and investigation of hygroscopicity and CCN activity of CaCO3 and Ca(HCO3)2 aerosols

摘要

@@Introduction Mineral aerosol is one of the most important component of aerosol in the atmosphere. On the regional scale, it has an impact on the air quality and human health. On the global scale, it can not only influence radiative transfer by absorption and scattering of solar radiation, but also affect the cloud formation and its optical properties, therefore influence the global climate ultimately by direct and indirect radiation forcing. Meanwhile, during the long range transport, mineral aerosols can undergo various heterogeneous reactions and its deposit has an impact on the ocean ecosystem and the whole biogeochemical cycling. CaCO3 is a common component of mineral dust, especially in East Asia and is generally regarded as the most reactive component in mineral particles(Krueger et al., 2003;Laskin et al., 2005;Sullivan et al., 2007;Usher, 2003). To study the physiochemical properties of mineral aerosol, generating a surrogate aerosol of mineral aerosol is needed. However, most of mineral dust component have very low solubility which makes generating aerosol by atomization from solution difficult. Therefore, a method that is easy to handle to generate a surrogate aerosol of mineral aerosol is in demand.