Dang! And it sounded so appealing!
Sent from my iPhone > On Jun 25, 2022, at 3:22 PM, Alan Robock ☮ <[email protected]> wrote: > > > But it's nasty stuff. Please keep in mind the last sentence of the abstract, > "However, our assumption that the rate of COS uptake by soils and plants does > not vary with increasing COS concentrations will need to be investigated in > future work, and more studies are needed on the prolonged exposure effects to > higher COS values in humans and ecosystems." > > From the National Library of Medicine, > https://pubchem.ncbi.nlm.nih.gov/compound/Carbonyl-sulfide : > > "Carbonyl sulfide is a colorless, poisonous, flammable gas with a distinct > sulfide odor. The gas is toxic and narcotic in low concentrations and > presents a moderate fire hazard." > > Alan > > Alan Robock, Distinguished Professor > Department of Environmental Sciences Phone: +1-848-932-5751 > Rutgers University E-mail: [email protected] > 14 College Farm Road http://people.envsci.rutgers.edu/robock > New Brunswick, NJ 08901-8551 ☮ https://twitter.com/AlanRobock >> On 6/25/22 2:25 PM, Ron Baiman wrote: >> Dear Colleagues, >> >> FYI, if you haven't heard or seen this. >> >> Carbonyl Sulfide (COS) aerosols released from the earth's surface and in >> models appear to have a cooling impact similar to SO2 released in the >> stratosphere. More research on the potential impacts of increased COS >> released from the surface into the troposphere, that (as I recall from the >> podcast) rises and stays in the stratosphere for an extended period of time, >> for example on soil and plant uptake is needed, but as Andrew opines, this >> method may be an "Sulfate Geoengineering COS Surface Radiative Forcing" >> (SG-COS-SRF) surface aerosol release breakthrough as it requires no aviation >> (conventional or other) or advanced injection technology. >> >> Listen here: >> https://podcasts.apple.com/us/podcast/using-tropospheric-cos-emissions-for-srm-quaglia/id1529459393?i=1000565776236 >> >> Paper Abstract: >> An approach to sulfate geoengineering with >> surface emissions of carbonyl sulfide >> Ilaria Quaglia1, Daniele Visioni2, Giovanni Pitari1, and Ben Kravitz3,4 >> 1Department of Physical and Chemical Sciences, Università dell’Aquila, 67100 >> L’Aquila, Italy >> 2Sibley School for Mechanical and Aerospace Engineering, Cornell University, >> Ithaca, NY 14853, USA >> 3Department of Earth and Atmospheric Science, Indiana University, >> Bloomington, IN, USA >> 4Atmospheric Sciences and Global Change Division, Pacific Northwest National >> Laboratory, >> Richland, WA, USA >> Correspondence: Ilaria Quaglia ([email protected]) >> Received: 29 September 2021 – Discussion started: 11 October 2021 >> Revised: 16 March 2022 – Accepted: 28 March 2022 – Published: 3 May 2022 >> Abstract. Sulfate geoengineering (SG) methods based on lower stratospheric >> tropical injection of sulfur dioxide >> (SO2) have been widely discussed in recent years, focusing on the direct and >> indirect effects they would have on >> the climate system. Here a potential alternative method is discussed, where >> sulfur emissions are located at the >> surface or in the troposphere in the form of carbonyl sulfide (COS) gas. >> There are two time-dependent chemistry– >> climate model experiments designed from the years 2021 to 2055, assuming a >> 40 Tg−S yr−1 artificial global flux >> of COS, which is geographically distributed following the present-day >> anthropogenic COS surface emissions >> (SG-COS-SRF) or a 6 Tg − S yr−1 injection of COS in the tropical upper >> troposphere (SG-COS-TTL). The >> budget of COS and sulfur species is discussed, as are the effects of both >> SG-COS strategies on the stratospheric >> sulfate aerosol optical depth (∼ 1τ = 0.080 in the years 2046–2055), aerosol >> effective radius (0.46 μm), surface >> SOx deposition (+8.9 % for SG-COS-SRF; +3.3 % for SG-COS-TTL), and >> tropopause radiative forcing (RF; >> ∼ −1.5 W m−2 in all-sky conditions in both SG-COS experiments). Indirect >> effects on ozone, methane and >> stratospheric water vapour are also considered, along with the COS direct >> contribution. According to our model >> results, the resulting net RF is −1.3 W m−2, for SG-COS-SRF, and −1.5 W m−2, >> for SG-COS-TTL, and it is >> comparable to the corresponding RF of −1.7 W m−2 obtained with a sustained >> injection of 4 Tg − S yr−1 in the >> tropical lower stratosphere in the form of SO2 (SG-SO2, which is able to >> produce a comparable increase of the >> sulfate aerosol optical depth). Significant changes in the stratospheric >> ozone response are found in both SG-COS >> experiments with respect to SG-SO2 (∼ 5 DU versus +1.4 DU globally). >> According to the model results, the >> resulting ultraviolet B (UVB) perturbation at the surface accounts for −4.3 >> % as a global and annual average >> (versus −2.4 % in the SG-SO2 case), with a springtime Antarctic decrease of >> −2.7 % (versus a +5.8 % increase >> in the SG-SO2 experiment). Overall, we find that an increase in COS >> emissions may be feasible and produce a >> more latitudinally uniform forcing without the need for the deployment of >> stratospheric aircraft. However, our >> assumption that the rate of COS uptake by soils and plants does not vary >> with increasing COS concentrations >> will need to be investigated in future work, and more studies are needed on >> the prolonged exposure effects to >> higher COS values in humans and ecosystems. >> >> Full paper: >> https://acp.copernicus.org/articles/22/5757/2022/ >> >> Best, >> Ron >> -- >> 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/CAPhUB9DjU62gj9J5-wJZ4%3D%3Drku-8-_%2BQWPG%3D6NT5L3fDKB%2B%3Dow%40mail.gmail.com. > -- > 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/171f5981-a614-2170-0713-4a3fd17652a2%40envsci.rutgers.edu. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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