2HCl + CaCO3 ---> CaCl2 + CO2 + H2O. How is this a good thing for GHGs and
GW?Greg
On Monday, August 2, 2021, 03:52:35 PM PDT, Geoeng Info
<[email protected]> wrote:
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
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- 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
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