This paper comes to mind https://www.science.org/doi/10.1126/sciadv.adk0593
Which proposes drying the stratosphere by seeding clouds at the tropopause As I discussed in my previous email yesterday, Doug raised concerns about H2 in Make Sunsets' balloons. I was also curious as to whether jet exhaust might negate some / all of the climate benefit of SAI https://www.youtube.com/live/_JBLMsXNmhs?si=57FK3DoOnV04edhN On Mon, 18 Mar 2024, 23:01 Colin Forrest, <colinforre...@gmail.com> wrote: > Researchers studying the aerosol burden after the Hunga Tonga Ha'apai > eruption on the 15th of January 2022 found that the aerosols coagulated and > fell out of the stratosphere faster than after the Pinotubo eruption. It is > a submarine volcano in the Tongan archipelago in the southern Pacific > Ocean. The eruption at its height produced a series of four underwater > thrusts, displaced 10 cubic kilometres (2.4 cu mi) of rock, ash and > sediment, and generated the largest atmospheric explosion recorded by > modern instrumentation. > > The researchers suggested that the faster rate of coagulation and > sedimentation in the Hunga Tonga plume was due to the amount of seawater > ejected. > > The consensus seems to be that fixed-wing jet aircraft are the way forward > (or up) for SAI, so we need to take into acount the number of flights > crossing the tropopause, which increases mixing across the tropopause, and > the amount of CO2 and H2O added and O2 removed from the stratosphere in > bulk terms, due to the combustion of jet fuel.. > > As the aircraft exhaust and the aerosol will be mixed into the plume > together at high temperature in the early moments when coagulation can > happen rapidly, the amount of water added to the plume may have a > significant effect on coagulation and sedimentation rates. Therefore > accurately modelling the amount of fuel burnt while deploying the aerosol > could be important, as at may affect the atmospheric lifetime of the > injected aerosol. > > Best Regards, Colin Forrest > > > -- > 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 geoengineering+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/geoengineering/CANFZHMCF6T0RYLgBABzc9%2BVH1KyMMbFtrM9-RaoeVRiDL_hRqw%40mail.gmail.com > <https://groups.google.com/d/msgid/geoengineering/CANFZHMCF6T0RYLgBABzc9%2BVH1KyMMbFtrM9-RaoeVRiDL_hRqw%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 geoengineering+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/geoengineering/CAJ3C-05cFJWoU1n2z6p8kGTRNVvRW0xA%2BXpyadiyGaGtF-Fr-w%40mail.gmail.com.
