WEEKLY SUMMARY (23 OCTOBER - 29 OCTOBER 2023) Subscribe to the Solar Geoengineering Updates Newsletter here: https://solargeoengineeringupdates.substack.com/ *Solar Geoengineering Updates* Monthly news summaries about solar geoengineering. Links to scientific papers, news articles, jobs, podcasts, and videos. <https://solargeoengineeringupdates.substack.com/?utm_source=substack&utm_campaign=publication_embed&utm_medium=email> By Andrew Lockley <https://solargeoengineeringupdates.substack.com/?utm_source=substack&utm_campaign=publication_embed&utm_medium=email>
DEADLINES:(NEW) Call for Proposals-Grants for social science research on solar radiation modification | Deadline: 13 December 2023 <https://www.degrees.ngo/degrees-research-funds/dspf-application-guide/> ------------------------------ RESEARCH PAPERSG6-1.5K-SAI: a new Geoengineering Model Intercomparison Project (GeoMIP) experiment integrating recent advances in solar radiation modification studies <https://egusphere.copernicus.org/preprints/2023/egusphere-2023-2406/> Visioni, D., Robock, A., Haywood, J., Henry, M., Tilmes, S., MacMartin, D. G., ... & Egbebiyi, T. S. (2023). G6-1.5 K-SAI: a new Geoengineering Model Intercomparison Project (GeoMIP) experiment integrating recent advances in solar radiation modification studies. *EGUsphere*, *2023*, 1-21.*Abstract:*The Geoengineering Model Intercomparison Project (GeoMIP) has proposed multiple model experiments during the phases 5 and 6 of the Climate Model Intercomparison Project (CMIP), with the latest set of model experiment proposed in 2015. With phase 7 of CMIP in preparation, and with multiple efforts ongoing to better explore the potential space of outcomes for different Solar Radiation Modification (SRM) both in terms of deployment strategies and scenarios and in terms of potential impacts, the GeoMIP community has identified the need to propose and conduct a new experiment that could serve as a bridge between past iterations and future CMIP7 experiments. Here we report the details of such a proposed experiment, named G6-1.5K-SAI, to be conducted with the current generation of scenarios and models from CMIP6, and clarify the reasoning behind many of the new choices introduced. Namely, compared to the CMIP6 GeoMIP scenario G6sulfur, here we decided on: 1) an intermediate emission scenario as baseline (the Shared Socioeconomic Pathway 2-4.5); 2) a start date set in the future that includes both considerations around the likelihood of exceeding 1.5 ºC above preindustrial and some considerations around a likely start date for an SRM implementation; 3) a deployment strategy for Stratospheric Aerosol Injection that does not inject in the tropical pipe in order to obtain a more latitudinally uniform aerosol distribution. We also offer more details over the preferred experiment length and number of ensemble members, and include potential options for second-tier experiments some modeling groups might want to run. The specifics of the proposed experiment will further allow for a more direct comparison between results obtained with CMIP6 models and those obtained with future scenarios for CMIP7. Natural variability can mask forced permafrost response to stratospheric aerosol injection in the ARISE-SAI-1.5 simulations <https://essopenarchive.org/doi/full/10.22541/essoar.169841696.64480296/v1> Ariel Lena Morrison, Elizabeth A. Barnes, James Wilson Hurrell. Natural variability can mask forced permafrost response to stratospheric aerosol injection in the ARISE-SAI-1.5 simulations. *ESS Open Archive .* October 27, 2023.Abstract:Stratospheric aerosol injection (SAI has been proposed as a potential method for mitigating risks and impacts associated with anthropogenic climate change. One such risk is widespread permafrost thaw and associated carbon release. While permafrost has been shown to stabilize under different SAI scenarios, natural variability may lead to a wide range of projected climate futures under SAI. Here we use the 10-member ensemble from the ARISE-SAI-1.5 simulations to assess the spread in projected active layer depth and permafrost temperature across boreal permafrost soils and specifically in four peatland and Yedoma regions. The forced response in active layer depth and permafrost temperature quickly diverge between an SAI and non-SAI world, but individual ensemble members overlap for several years following SAI deployment. Projected permafrost variability may mask the forced response to SAI and make it difficult to detect if and when SAI is stabilizing permafrost in any single realization. We find that it may take more than a decade of SAI deployment to detect the effects of SAI on permafrost temperature and almost 30 years to detect its effects on active layer depth. Not only does natural variability make it more difficult to detect SAI’s influence, it could also affect the likelihood of reaching a permafrost tipping point. In some realizations, SAI fails to prevent a tipping point that is also reached in a non-SAI world. Our results underscore the importance of accounting for natural variability in assessments of SAI’s potential influence on the climate system. Comparison of UKESM1 and CESM2 simulations using the same multi-target stratospheric aerosol injection strategy <https://acp.copernicus.org/articles/23/13369/2023/> Henry, M., Haywood, J., Jones, A., Dalvi, M., Wells, A., Visioni, D., ... & Tye, M. R. (2023). Comparison of UKESM1 and CESM2 simulations using the same multi-target stratospheric aerosol injection strategy. *Atmospheric Chemistry and Physics*, *23*(20), 13369-13385.*Abstract:*Solar climate intervention using stratospheric aerosol injection (SAI) has been proposed as a method which could offset some of the adverse effects of global warming. The Assessing Responses and Impacts of Solar climate intervention on the Earth system with Stratospheric Aerosol Injection (ARISE-SAI) set of simulations is based on a moderate-greenhouse-gas-emission scenario and employs injection of sulfur dioxide at four off-equatorial locations using a control algorithm which maintains the global-mean surface temperature at 1.5 K above pre-industrial conditions (ARISE-SAI-1.5), as well as the latitudinal gradient and inter-hemispheric difference in surface temperature. This is the first comparison between two models (CESM2 and UKESM1) applying the same multi-target SAI strategy. CESM2 is successful in reaching its temperature targets, but UKESM1 has considerable residual Arctic warming. This occurs because the pattern of temperature change in a climate with SAI is determined by both the structure of the climate forcing (mainly greenhouse gases and stratospheric aerosols) and the climate models' feedbacks, the latter of which favour a strong Arctic amplification of warming in UKESM1. Therefore, research constraining the level of future Arctic warming would also inform any hypothetical SAI deployment strategy which aims to maintain the inter-hemispheric and Equator-to-pole near-surface temperature differences. Furthermore, despite broad agreement in the precipitation response in the extratropics, precipitation changes over tropical land show important inter-model differences, even under greenhouse gas forcing only. In general, this ensemble comparison is the first step in comparing policy-relevant scenarios of SAI and will help in the design of an experimental protocol which both reduces some known negative side effects of SAI and is simple enough to encourage more climate models to participate. <https://essopenarchive.org/doi/full/10.22541/essoar.169841696.64480296/v1> ------------------------------ THESISRadiative Forcing & Feedback through the Lens of Solar Geoengineering <https://uwspace.uwaterloo.ca/handle/10012/20058> ------------------------------ WEB POSTSDegrees launches world’s first research fund for SRM social science in the Global South <https://www.degrees.ngo/degrees-launches-worlds-first-research-fund-for-srm-social-science-in-the-global-south/> (The Degrees Initiative)Tiny but powerful Mach 5 ramjet engine could make drones supersonic soon <https://interestingengineering.com/innovation/mach-5-hypersonic-ramjet-engine> (Interesting Engineering) ------------------------------ *UPCOMING EVENTS**Model Simulations of Climate Interventions Aiming to Offset Future Warming: Insights and Uncertainties by Healthy Planet Action Coalition <https://us02web.zoom.us/j/88954851189?pwd=WVZoeTBnN3kyZFoyLzYxZ1JNbDFPUT09> | 02 November 2023*(NEW) Solar Climate Intervention Virtual Symposia <https://sites.google.com/view/solargeo-symposium/home> | 10 November 2023(NEW) 104th Annual Meeting by American Meteorological Society <https://ams.confex.com/ams/104ANNUAL/meetingapp.cgi/Program/1743> | 28 January 2024 - 01 February 2023*Climate Engineering (GRS) <https://www.grc.org/climate-engineering-grs-conference/2024/>| 17-18 February 2024**GRC Climate Engineering 2024 <https://www.grc.org/climate-engineering-conference/2024/>| 18-23 February 2024* ------------------------------ *JOB OPPORTUNITIES**Assistant Professor at Texas A&M University: College of Arts & Sciences: Atmospheric Sciences <https://apply.interfolio.com/130887> | Deadline: 06 November 2023* *“The Department of Atmospheric Sciences in the College of Arts & Sciences at Texas A&M University invites applications for two full-time tenure-track assistant professor positions in the areas of (i) weather and climate risk, climate impacts, or geoengineering, (ii) applications of machine learning or artificial intelligence in weather and climate, or (iii) atmospheric turbulence, boundary layer meteorology, or urban meteorology, including high-resolution observations, modeling, or downscaling. This position is expected to begin in Fall 2024.”* *Technical Director at Arctic Ice Project (AIP) <https://groups.google.com/g/geoengineering/c/5LlEkXCkdyQ>* *“AIP (*https://www.arcticiceproject.org*) is dedicated to preserving and restoring Arctic sea ice to both cool the Arctic and slow down global warming. We are in our R&D phase now to ensure our methodology is both safe for the environment and effective.”* ------------------------------ *PODCASTS*Cloud seeding law - Simon | Reviewer 2 Does geoengineering Cloud seeding law - Simon Reviewer 2 does geoengineering 1:05:09 <https://podcasts.apple.com/us/podcast/cloud-seeding-law-simon/id1529459393?i=1000632950341&uo=4> *“Manon Simon discusses her thesis on the legal overlap between cloud seeding and MCB. What can we learn and apply from decades of cloud seeding regulation?”* Pinatubo’s effect on ozone - Peng | Reviewer 2 does geoengineering Pinatubo’s effect on ozone - Peng Reviewer 2 does geoengineering 47:41 <https://podcasts.apple.com/us/podcast/pinatubos-effect-on-ozone-peng/id1529459393?i=1000632950806&uo=4> *“Want to know *exactly* how Pinatubo affected ozone? After a marathon 6h edit, @geoengineering1 has finally managed to retrieve some usable audio from his car-crash Pinatubo interview - and it actually sounds OK, remarkably. Paper: Perturbation of Tropical Stratospheric Ozone Through Homogeneous and Heterogeneous Chemistry Due To Pinatubo https://doi.org/10.1029/2023GL103773 <https://doi.org/10.1029/2023GL103773>”* ------------------------------ YOUTUBE VIDEOSHow to harness the power of volcanoes | Anders Sandberg | How volcanoes could change the world | The Institute of Art and Ideas <https://www.youtube.com/watch?v=AreKespYePc> *“Anders Sandberg talks through ways of geoengineering volcanoes, and why we might want to pursue them.**Can we do anything about the existential risk posed by volcanic eruptions?**The power of volcanoes could change the world. From bombing them in WW2, to exploding US lava flows, we have tried in vain to tame their power for the last century. Join Oxford futurist Anders Sandberg as he argues that geoengineering could transform our lives and the world as we know it.”* Gabriela Ramos C2G Closing Event | C2G Carnegie Climate Governance Initiative <https://www.youtube.com/watch?v=EP5PdYGjArU> *“Gabriela Ramos, Assistant Director-General, United Nations Educational, Scientific and Cultural Organization shares thoughts and reflections about working with Carnegie Climate Governance Initiative (C2G). More speakers will share their thoughts at the C2G closing event. You can also see more on C2G’s video wall.”* -- 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/CAHJsh9-UWRAQ0ybrm_RvAkjBPCeu1LAFYb5V82jdLD07LWMmhA%40mail.gmail.com.
