Scale and location matter: by actually reading the paper, most of the SO₂ is injected well below the stratosphere (20% in the PBL, 20% between 13 and 17km) to simulate a kind of flood basalt eruptions that happened over 15 Ma years ago, continuous over an amount of years. This leads to a warming in the UT and lowermost S of over 50 K, which completely removes the tropical stratosphere. GEOSCCM (the model used here) has been used for Pinatubo-like simulations and other simulations that inject in the stratosphere, with results consistent with available measurements. Needless to say, the tropopause didn’t disappear with Pinatubo nor with any present-day eruptions.
> On Oct 30, 2022, at 2:25 AM, Andrew Lockley <[email protected]> wrote: > > Poster's note: old(ish) but new to me, and I assume to the list. Comments are > particularly welcome. Obviously this would be a big deal if true. > > https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL096612 > <https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL096612> > > Volcanic Climate Warming Through Radiative and Dynamical Feedbacks of SO2 > Emissions > Scott D. Guzewich,Luke D. Oman,Jacob A. Richardson,Patrick L. Whelley,Sandra > T. Bastelberger,Kelsey E. Young,Jacob E. Bleacher,Thomas J. Fauchez,Ravi K. > Kopparapu > First published: 01 February 2022 > https://doi.org/10.1029/2021GL096612 <https://doi.org/10.1029/2021GL096612> > Citations: 1 > Read the full text > About > > > Share on > Abstract > Volcanic flood basalt eruptions have been linked to or are contemporaneous > with major climate disruptions, ocean anoxic events, and mass extinctions > throughout at least the last 400 M years of Earth's history. Previous studies > and recent history have shown that volcanically-driven climate cooling can > occur through reflection of sunlight by H2SO4 aerosols, while longer-term > climate warming can occur via CO2 emissions. We use the Goddard Earth > Observing System Chemistry-Climate Model to simulate a 4-year duration > volcanic SO2 emission of the scale of the Wapshilla Ridge member of the > Columbia River Basalt eruption. Brief cooling from H2SO4 aerosols is > outweighed by dynamically and radiatively driven warming of the climate > through a three orders of magnitude increase in stratospheric H2O vapor. > > Key Points > Volcanic emission of SO2 produces warming through climate feedbacks > > The warming is driven by a three orders of magnitude increase in > stratospheric H2O vapor > > Climate cooling by H2SO4 aerosols persists for less time than the eruption > itself > > -- > 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] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/geoengineering/CAJ3C-07xH0TgkHTbFDsQ15z8mc%2BVXfNk5UJZ2NnAoCgdbLL6Rg%40mail.gmail.com > > <https://groups.google.com/d/msgid/geoengineering/CAJ3C-07xH0TgkHTbFDsQ15z8mc%2BVXfNk5UJZ2NnAoCgdbLL6Rg%40mail.gmail.com?utm_medium=email&utm_source=footer>. -- 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/FBC6E952-5786-4C13-83E0-F7AC4F5169C7%40gmail.com.
