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. 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