Alan Does the temperature of the tropopause change? What is the impact, if any, on the stratospheric exchange time? I am thinking about the effect on CFCs, CH4, and stratospheric chemistry. Is there a paper on this? Does added sulfate from SO2 injection into the stratosphere warm the stratosphere significantly?
Regards Oliver Wingenter On Fri, May 14, 2021 at 12:44 AM Andrew Lockley <[email protected]> wrote: > I'm interested to understand the effect on SRM. Eg more technical > difficulties with lofting, earlier rain out, etc. I'd welcome discussion. > > Andrew > > On Thu, 13 May 2021, 14:41 Alan Robock ☮, <[email protected]> > wrote: > >> This is certainly not unexpected. We wrote a paper on this 25 years ago: >> >> Vinnikov, Konstantin Ya., Alan Robock, Ronald J. Stouffer and Syukuro >> Manabe, 1996: Vertical patterns of free and forced climate variations. >> *Geophys. >> Res. Lett.*, *23*, 1801-1804. >> http://climate.envsci.rutgers.edu/pdf/VinnikovVertical96GL01736.pdf >> >> And I don't think it is an important reason to do CDR. There are other >> good reasons, but this does not affect us nearly as much as other impacts >> of global warming. >> >> Alan >> >> Alan Robock, Distinguished Professor >> Chair-Elect, AGU College of Fellows >> Associate Editor, *Reviews of Geophysics* >> 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 >> >> "I've got a feeling 21 is going to be a good year" - The Who from the >> album *Tommy* >> >> [image: Signature] >> >> >> On 5/13/2021 6:33 AM, Andrew Lockley wrote: >> >> >> ---------- Forwarded message --------- >> From: Tom Goreau <[email protected]> >> Date: Thu, 13 May 2021, 11:03 >> Subject: [CDR] CO2 shrinks the stratosphere >> To: 'Greg Rau' via Carbon Dioxide Removal < >> [email protected]> >> >> >> *Yet another unexpected reason why CDR is needed!* >> >> >> >> *Stratospheric contraction caused by increasing greenhouse gases* >> >> To cite this article before publication: Petr Pisoft et al 2021 Environ. >> Res. Lett. in press https://doi.org/10.1088/1748-9326/abfe2b >> >> P. Pisoft1 , P. Sacha1,2, L. M. Polvani3 , J. A. Añel4 , L. de la Torre4 >> , R. Eichinger1,5,6, U. Foelsche7 , P. Huszar1 , C. Jacobi8 , J. >> Karlicky1,2, A. Kuchar1,8, J. Miksovsky1 , M. Zak1 , H. E. Rieder2 >> >> >> >> *Abstract* Rising emissions of anthropogenic greenhouse gases (GHG) have >> led to tropospheric warming and stratospheric cooling over recent decades. >> As a thermodynamic consequence, the troposphere has expanded and the rise >> of the tropopause, the boundary between the troposphere and stratosphere, >> has been suggested as one of the most robust fingerprints of anthropogenic >> climate change. Conversely, at altitudes above ~55 km (in the mesosphere >> and thermosphere) observational and modeling evidence indicates a downward >> shift of the height of pressure levels or decreasing density at fixed >> altitudes. The layer in between, the stratosphere, has not been studied >> extensively with respect to changes of its global structure. Here we show >> that this atmospheric layer has contracted substantially over the last >> decades, and that the main driver for this are increasing concentrations of >> GHG. Using data from coupled chemistry-climate models we show that this >> trend will continue and the mean climatological thickness of the >> stratosphere will decrease by 1.3 km following representative concentration >> pathway 6.0 by 2080. We also demonstrate that the stratospheric contraction >> is not only a response to cooling, as changes in both tropopause and >> stratopause pressure contribute. Moreover, its short emergence time (less >> than 15 years) makes it a novel and independent indicator of GHG induced >> climate change. >> >> >> >> >> *Thomas J. F. Goreau, PhD President, Global Coral Reef Alliance* >> >> >> *Chief Scientist, Blue Regeneration SL President, Biorock Technology Inc.* >> >> *Technical Advisor, Blue Guardians Programme, SIDS DOCK* >> >> *37 Pleasant Street, Cambridge, MA 02139* >> >> >> >> >> *[email protected] <[email protected]> www.globalcoral.org >> <http://www.globalcoral.org> Skype: tomgoreau Tel: (1) 617-864-4226 (leave >> message)* >> >> >> >> *Books:* >> >> *Geotherapy: Innovative Methods of Soil Fertility Restoration, Carbon >> Sequestration, and Reversing CO2 Increase* >> >> http://www.crcpress.com/product/isbn/9781466595392 >> >> >> >> *Innovative Methods of Marine Ecosystem Restoration* >> >> http://www.crcpress.com/product/isbn/9781466557734 >> >> >> >> *No one can change the past, everybody can change the future* >> >> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Carbon Dioxide Removal" 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/CarbonDioxideRemoval/F9887C8D-8B48-49D4-9557-92398C135843%40globalcoral.org >> <https://groups.google.com/d/msgid/CarbonDioxideRemoval/F9887C8D-8B48-49D4-9557-92398C135843%40globalcoral.org?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/CAJ3C-04p8nju0X3oxEAG%3DmMU_h41bQ%2Beie%3D9sv88YK3X-E6ipw%40mail.gmail.com >> <https://groups.google.com/d/msgid/geoengineering/CAJ3C-04p8nju0X3oxEAG%3DmMU_h41bQ%2Beie%3D9sv88YK3X-E6ipw%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/CAJ3C-04Y5_Lv14%2BTSgPB6TmEKQWb7%2Bqc2hm6TDehJnie42_qqg%40mail.gmail.com > <https://groups.google.com/d/msgid/geoengineering/CAJ3C-04Y5_Lv14%2BTSgPB6TmEKQWb7%2Bqc2hm6TDehJnie42_qqg%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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