https://pubs.acs.org/doi/abs/10.1021/acsearthspacechem.1c00151
Heterogeneous Reactivity of HCl on CaCO3 Aerosols at Stratospheric Temperature - Han N. Huynh and - V. Faye McNeill - - - - - *Abstract* Recently proposed as a possible alternative to sulfate particles for stratospheric solar radiation management (SSRM), calcite (CaCO3) aerosols have been modeled to have minimal negative impact on both stratospheric ozone level, through heterogeneous chemistry, and stratospheric temperature. However, the heterogeneous chemistry of CaCO3 aerosols with relevant trace gases, such as HCl, at stratospheric conditions is still underexamined. We studied the kinetics of HCl uptake on airborne CaCO3 aerosols at stratospheric temperature, 207 ± 3 K, by performing experiments under dry conditions using an aerosol flow tube coupled with a custom-built quadrupole chemical ionization mass spectrometer (CIMS) for HCl detection. The reactive uptake coefficient for HCl was measured to be 0.076 ± 0.009. This exceeds the reactive uptake coefficient of 0.013 ± 0.001 that we previously reported for this system at 296 K, consistent with the expected negative temperature dependence of gas uptake on solid surfaces. This finding suggests an initial strong reactive uptake of HCl gas on CaCO3 aerosol surfaces in the stratosphere -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAKSzgpaROQJnv3ZD0ZqfMcZzegkw492mxCUktv_nnQEN3MLRGA%40mail.gmail.com.
