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Andrew Lockley <https://substack.com/@solargeoengineeringupdates>
Sep 1
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*1. This Week’s Top SRM Highlights**2. Research Papers*3. Thesis*4. Reports**5.
Web Posts*6. Job Opportunities*7. Upcoming Events**8. YouTube Videos*

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*RESEARCH PAPER: *Multi-Model Future World Aridity and Groundwater Recharge
Changes With and Without Stratospheric Aerosol Intervention Under High
Warming Scenario (AGU)
<https://substack.com/redirect/01c44c50-76dd-4ea8-a495-9270fc162539?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*REPORT:* Solar Geoengineering, Aviation and the Future of Climate Control
(Simpliflying)
<https://substack.com/redirect/38fe10bf-ddb1-476b-8f5f-c8c17b825ed2?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*UPCOMING EVENT:* Multistakeholder Workshop on Solar Radiation Modification
- Online (UNEP)
<https://substack.com/redirect/4ebbb413-ff6c-4acf-8c16-66d08f931975?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*JOB OPPORTUNITY: *Research Associate at Climate Systems Engineering
initiative (CSEi) (University of Chicago)
<https://substack.com/redirect/31557d08-3822-4aee-af5f-06cddfb61987?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*PERSPECTIVE:* Cooling Isn’t Plan B – It’s How Plan A Succeeds (SRM360)
<https://substack.com/redirect/ddb7f261-2a3e-45f8-811c-78e6edf5e744?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Read on to unpack more updates:*
<https://substack.com/redirect/508f2577-3c28-4e65-b21a-8593d886b993?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Africa's regional and local climate response to stratospheric aerosol
injection characteristics
<https://substack.com/redirect/7f9c978b-313f-4e99-9ab5-c61bc61e5f1a?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*

*Authors*: Naomi Kumi, Caleb Mensah, Kwesi A. Quagraine, Trisha D. Patel,
Frederick Otu-Larbi, Nana Agyemang Prempeh, Mariam Nguvava, Tiro Nkemelang,
Babatunde Abiodun, Chris Lennard, Mark New, Romaric C. OdoulamiSynopsis:
This study uses GLENS SAI simulations under RCP8.5 to assess impacts on
Africa’s climate. All SAI experiments cool the continent, with GLENS_eq
most effective at reducing temperature extremes, especially in Central and
Southern Africa. However, residual warming persists in the Sahel and North
Africa. While SAI reduces flood risks by offsetting extreme rainfall, it
also intensifies drying trends, threatening water and agriculture. Findings
reveal regional trade-offs, stressing the need for optimized strategies.

*Evaluating the impacts of localized artificial enhancement of sea ice
albedo over Beaufort Gyre towards restoring Arctic Sea Ice
<https://substack.com/redirect/a8840760-cee1-4b5f-aaa2-131fbd1e5253?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*

*Authors*: Detelina Ivanova, Subarna Bhattacharyya, Anthony Strawa, Steve
Zornetzer, Stephanie Olinger, Leslie Field, Alexander Ivanov, Ethan
Kusnadi, Jacob KimSynopsis: This study tests targeted surface albedo
modification (SAM) in the Beaufort Gyre using CESM2 simulations
(2000–2050). Results show that enhancing albedo by ~50% lowers absorbed
radiation by ~5 W/m², cools the Arctic by ~0.78 °C (BG by ~3 °C), and
thickens summer sea ice by ~1 m. Findings suggest SAM could delay an
ice-free Arctic, offering a potential interim climate intervention when
emission cuts alone prove insufficient.

*Multi-Model Future World Aridity and Groundwater Recharge Changes With and
Without Stratospheric Aerosol Intervention Under High Warming Scenario
<https://substack.com/redirect/01c44c50-76dd-4ea8-a495-9270fc162539?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*

Authors: Abolfazl Rezaei, John Moore, Simone Tilmes, Daniele Visioni, Azfar
HussainSynopsis: This study examines how SAI affects groundwater recharge
(GWR) using six G6Sulfur models (2070–2099). SAI reduces global aridity
(+25.4% → +9.1%) but fails to restore GWR (−7.7% → −7.6%) due to sustained
evapotranspiration (+7–25%). Deficits persist in the Mediterranean,
northern midlatitudes, southern Africa, and Brazil, with partial gains in
India, the Sahel, and South America. Results reveal regionally uneven,
model-dependent outcomes and highlight the influence of CO₂-physiological
forcing.

*Evaluating simulations of ship tracks in a high-resolution model -
Preprint
<https://substack.com/redirect/e14b7501-3ef9-4240-9305-d834bd838fd8?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*

*Authors: *Anna Tippett, Paul R. Field, and Edward GryspeerdtSynopsis: This
study models ship tracks as analogues for *MCB* and compares results with
satellite data. While models reproduce mean cloud properties, they fail to
capture temporal evolution. In precipitating clouds, droplet number (Nd)
and liquid water path (LWP) are overestimated, with drizzle suppression
persisting unrealistically. This reflects excessive sensitivity to aerosol
loading, leading to an *overestimated cooling effect*. Findings show
current parameterisations are unsuitable for high-aerosol MCB scenarios.

<https://substack.com/redirect/61940179-8e80-45a9-b88f-5f1bf4f83be1?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>
Source
<https://substack.com/redirect/73dbd53c-aa89-42b0-a962-61aa5e2f2c80?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>
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<https://substack.com/redirect/c4bd1f1b-1356-4b4f-a588-4caa150d399f?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Experimental Insights On Collective Action Dilemmas: Social Comparison,
Present Bias, And Coordination
<https://substack.com/redirect/13a482db-69e5-44a5-ba7b-ea47b59a17fb?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*

*Authors*: Pablo David Campoverde VarelaSynopsis: This dissertation
explores collective action challenges in climate mitigation using
behavioral models and experiments. Chapter 1 shows that under positional
concerns, contributions fall when efforts exceed peer norms. Chapter 2
compares present bias in solar geoengineering decisions, revealing
different responses between free drivers and planners. Chapter 3 applies
game theory, showing geoengineering as insurance lowers coordination costs
but weakens incentives. Overall, findings highlight how fairness, time
preferences, and strategic uncertainty shape climate decisions.

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<https://substack.com/redirect/a2df1123-22e8-42e4-a9ed-3f863a960026?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Simpliflying
<https://substack.com/redirect/38fe10bf-ddb1-476b-8f5f-c8c17b825ed2?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Solar Geoengineering, Aviation and the Future of Climate Control

Synopsis: This explainer breaks down solar geoengineering, from volcanic
models to stratospheric aerosol injection, an examines aviation role in
climate intervention.

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<https://substack.com/redirect/50e91bde-cd82-4a9b-94d2-4a7d8b5c0228?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Dialogue Earth
<https://substack.com/redirect/3779f537-c598-43f2-a7e1-7284bd0c97ff?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Explainer: Could making ocean clouds shinier cool the planet?

*PIB
<https://substack.com/redirect/cf124754-ed24-4c50-9c1c-d5a540a78f3d?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
High-Level Workshop by CSEP-NITI Aayog-CEEW Highlights Need for India to
Evaluate Research, Risks, and Governance of Geoengineering

*SRM360
<https://substack.com/redirect/ddb7f261-2a3e-45f8-811c-78e6edf5e744?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Cooling Isn’t Plan B – It’s How Plan A Succeeds
------------------------------
<https://substack.com/redirect/82ac7cec-a9a5-4c28-bfed-d44a6b9cd554?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Research Associate at Climate Systems Engineering initiative (CSEi) |
University of Chicago
<https://substack.com/redirect/31557d08-3822-4aee-af5f-06cddfb61987?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*

"The CSEi Postdoctoral Researchers Program seeks outstanding early-career
scholars from across disciplines who are eager to advance understanding of
the benefits, risks, and governance of technologies that might reduce the
impacts of accumulated greenhouse gases. Areas of focus include sunlight
reflection methods (SRM), open-systems carbon removal, local interventions
to prevent glacial melt, as well as the social, ethical, and policy
dimensions of these technologies."

Share Solar Geoengineering Updates
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*04-05 September
<https://substack.com/redirect/55eecd27-4e9a-4e2d-9f14-d4264514bde9?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 |* Washington DC
<https://substack.com/redirect/55eecd27-4e9a-4e2d-9f14-d4264514bde9?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
2025 RFF and Harvard SRM Social Science Research Workshop: Governance in a
Fractured World

*07 September
<https://substack.com/redirect/c8701aa2-5e94-4bfa-9304-bbb2e338923c?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *Online
<https://substack.com/redirect/c8701aa2-5e94-4bfa-9304-bbb2e338923c?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Confessions of a Climate Activist: Clean Energy Alone Can No Longer Save
Us. We Need to Study Sunlight Reflection by MEER

*09-10 September
<https://substack.com/redirect/4ebbb413-ff6c-4acf-8c16-66d08f931975?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *Online
<https://substack.com/redirect/4ebbb413-ff6c-4acf-8c16-66d08f931975?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Multi-stakeholder Workshop on Solar Radiation Modification by UNEP *(NEW)*

*21-28 September
<https://substack.com/redirect/640b7af3-a213-40d3-bf99-4dd7e36e8263?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *New York
<https://substack.com/redirect/640b7af3-a213-40d3-bf99-4dd7e36e8263?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Climate Week NYC by Climate Group *(NEW)*

*23 September
<https://substack.com/redirect/03326464-b6b8-4961-a19a-69dca7cb3d50?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *NYC, United States
<https://substack.com/redirect/03326464-b6b8-4961-a19a-69dca7cb3d50?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
The state of SRM impacts science and the need for responsible research by
EDF at Climate Week NYC

*24 September 2025
<https://substack.com/redirect/4bd2861f-03a6-4009-996e-2cab8ab160a4?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *New York
<https://substack.com/redirect/4bd2861f-03a6-4009-996e-2cab8ab160a4?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Solar Geoengineering Research: Next Steps for Civil Society by DSG CCAN
*(NEW)*

*30 September
<https://substack.com/redirect/68253131-bfda-4688-bf65-f9e7e89a9749?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *Belgium
<https://substack.com/redirect/68253131-bfda-4688-bf65-f9e7e89a9749?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Grappling with accelerating climate risks - Is it time to explore research
into Solar Radiation Modification? by Euractive

*6 – 9 October
<https://substack.com/redirect/a3dbe9ce-e90c-4600-b39e-338581294fc1?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *Online
<https://substack.com/redirect/a3dbe9ce-e90c-4600-b39e-338581294fc1?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Virtual workshop series on Stratospheric Aerosol Injection

*17 October
<https://substack.com/redirect/a0c5db90-d1e0-45d5-bdcf-c5343cb1abb0?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Introducing SkyScroll by Planetary Sunshade Foundation

*21-22 October
<https://substack.com/redirect/97dfc41f-0e45-4e9d-8108-c14e39984a96?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *Helsinki, Finland
<https://substack.com/redirect/97dfc41f-0e45-4e9d-8108-c14e39984a96?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Workshop: The Future of climate intervention research - an early career
gathering by Alliance for Just Deliberation on Solar Geoengineering *(NEW)*

*23 October
<https://substack.com/redirect/e11d2aee-cc38-42d5-b7c7-e959371a34a5?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *Helsinki
<https://substack.com/redirect/e11d2aee-cc38-42d5-b7c7-e959371a34a5?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
ATLAS25: Risk Management of Earth System Tipping Points by Operaatio Arktis

*3-7 November
<https://substack.com/redirect/6638ead2-41c8-49e5-a5b8-af0979f3b9e1?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 |* Pune, India
<https://substack.com/redirect/6638ead2-41c8-49e5-a5b8-af0979f3b9e1?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
11th WMO Scientific Conference on Weather Modification

*15-19 December
<https://substack.com/redirect/e6c19b20-438d-4463-868a-39b6b7b132c2?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *New Orleans, Louisiana
<https://substack.com/redirect/e6c19b20-438d-4463-868a-39b6b7b132c2?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>
*
- 2025 American Geophysical Union Meeting

‎*9-13 March 2026
<https://substack.com/redirect/7a3f4120-57da-4105-9800-bbd6eef43ca8?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *Kyoto, Japan
<https://substack.com/redirect/7a3f4120-57da-4105-9800-bbd6eef43ca8?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
CMIP Community Workshop (CMIP26)

*21-26 June 2026
<https://substack.com/redirect/84fbf901-3d92-418f-8b9a-4a76571108a4?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
 | *United States
<https://substack.com/redirect/84fbf901-3d92-418f-8b9a-4a76571108a4?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
-
Gordon Research Conference - Bridging Observations, Models, and Impacts in
Solar Radiation Modification Research

Solar Geoengineering Events Calendar
<https://substack.com/redirect/577459e9-9488-4c02-a057-8c731d0e27ef?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Subscribe to the Solar Geoengineering Events Calendar by adding this link
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*https://ics.teamup.com/feed/ks64mmvtit583eitxx/0.ics
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<https://substack.com/redirect/eaae3204-fe16-4b89-957f-c99b65007ca1?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

*Making Sense of Wildfires and Solar Geoengineering | SRM360
<https://substack.com/redirect/c5317527-c4c3-4545-a061-eb1e44fef7d9?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
<https://substack.com/redirect/0e562082-e52e-405b-8d81-3ac3422a50b5?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

"An expert panel featuring Dr. Patrick Brown, Dr. Danielle Touma, Dr. Brian
Buma, and Dr. Lili Xia discuss:– How climate change is contributing to
wildfires– The impacts of wildfires and the potential to adapt to them–
Whether solar geoengineering could reduce wildfire risk– Broader challenges
and considerations raised by solar geoengineering."

*Francis Nkrumah, SRI (2024) | Operaatio Arktis
<https://substack.com/redirect/d940d420-7905-4a35-acc5-9cce5ff4a77f?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>*
<https://substack.com/redirect/51cf1d3d-3100-4f64-8b96-e7e9346370dc?j=eyJ1IjoiMXlhMnUzIn0.-xq-mvUw9sjSVZFRVf_xTVa_TZf2s9WaVlK1illEQ0g>

"We participated in the world's largest sustainability conference by
organising two workshops on climate interventions.Among these workshops we
had a pleasure of hosting a key note speech by Francis Nkrumah at our
office after the conference.Francis Nkrumah is a lecturer and a research
scientist in the Department of Physics, at the University of Cape Coast,
Ghana. His current project is Solar Radiation Modification (Stratospheric
Aerosol Injection)."

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