In this episode, Sudhanshu Jain, comments the paper that presents two methods for the lab-scale formation of aerosols of nanosized particles of precipitated calcium carbonate (PCC) with potential for use in Stratospheric Aerosol Injection (SAI), a Solar Radiation Management (SRM) technique. You can find the paper here: https://doi.org/10.1175/JTECH-D-20-0205.1

Thanks for listening! You can contact us at twitter with feedback, comments and/or suggestions @reviewer2geo

In this episode, student Gideon Futerman welcomes researcher Daniele Visioni to discuss the event Solar Geoengineering: Warnings from Scientists, Indigenous Peoples, Youth, and Climate Activists that happened on the 9th june 2021. You can check the recording of the event here: https://youtu.be/Sqlt5lqDpY8

Daniele Visioni is currently a Postdoctoral Researcher at Cornell University, Sibley School of Mechanical and Aerospace Engineering, working with prof. Douglas MacMartin on the newly funded Geoengineering Assessment across Uncertainties, Scenarios, and Strategies GAUSS project. His research is currently focused on studying Sulfate Geoengineering, a form of climate engineering that aims to partially, temporarily, offset the effects of climate change by means of injecting sulfate precursors in the stratosphere in order to reflect a small part of the incoming solar radiation and thus reduce global temperatures.

The article discussed by Digdaya et al is at https://www.nature.com/articles/s41467-020-18232-y

For some background to this research:  

http://www.exeter.ac.uk/news/research/title_860000_en.html

Pengfei Yu is a co-author in this ground breaking paper titled "Toward practical stratospheric aerosol albedo modification: Solar-powered lofting" 

https://advances.sciencemag.org/content/7/20/eabe3416/tab-article-info provides links to the article and all author information. 

Jens Hartmann (Prof. Dr. rer. nat. habil.) of the Institute for Geology / Center for Earth System Research and Sustainability at Universität Hamburg / Bundesstrasse 55 / D-20146 Hamburg discusses with Andrew his work on enhanced weathering. Jens has kindly included some fantastic links to his work below.  

1) Goldschmidt-Link

https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Symposium/19

2) Abstract-Link

3) Carbdown-Link

Selected publications supporting other concepts discussed in the episode: 

1) Ideas and Perspectives: Synergies from co-deplyment of negative emission technologies

Link (open access): https://bg.copernicus.org/articles/16/2949/2019/

2) Enhanced chemical weathering as a geoengineering strategy to reduce atmospheric carbon dioxide, supply nutrients, and mitigate ocean acidification

Link (open access)https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/rog.20004

3) Figure showing Co-Benefits: Attached. With permission of Jens Hartmann and Thorben Amann.

Tyler Felgenhauer discusses his exciting paper on the politics of solar geoengineeering research specifically in relation to the U.S policy agenda. A must listen.  

Felgenhauer, T., Horton, J., & Keith, D. (2021). Solar geoengineering research on the U.S. policy agenda: when might its time come? Environmental Politics, 1-21. doi:10.1080/09644016.2021.1933763

Tyler Felgenhauer is Director of Climate Research at the Duke Center on Risk, and a Research Scientist with the Modeling Environmental Risks and Decisions Group (MERDG), at Duke University. His research examines the climate-society system and options for responding to climate change risk in an integrated way, drawing on approaches from systems analysis, modeling, decision analysis, and other analytical methods from public policy, economics, and political science.

Andrew and Walker discussed a wide variety of things - here are some useful links: 

Aluminum increases net carbon fixation by marine diatoms and decreases their decomposition: Evidence for the iron–aluminum hypothesis - https://aslopubs.onlinelibrary.wiley.com/doi/10.1002/lno.11784

Solar geoengineering can alleviate climate change pressures on crop yields - https://www.nature.com/articles/s43016-021-00278-w

Mission Zero Technologies: https://missionzero.tech

Heirloom: https://www.heirloomcarbon.com

The Future Forest Company: https://thefutureforestcompany.com

CarbonBuilt: https://www.carbonbuilt.com

Running Tide: https://www.runningtide.com

Some links discussed in the program: 

https://www.heirloomcarbon.com 

https://science.sciencemag.org/content/351/6273/597

https://twitter.com/peteirvine/status/1389199061060829185?s=08

https://www.pnas.org/content/118/15/e1921854118

Discussing her current paper, Clarissa Kroll talks to Andrew about the impact of volcanic eruptions on stratospheric water vapour in the tropics. 

Her paper is currently in review at ACP : https://acp.copernicus.org/preprints/acp-2020-1191/

Kroll, C. A., Dacie, S., Azoulay, A., Schmidt, H., and Timmreck, C.: The Impact of Volcanic Eruptions of Different Magnitude on Stratospheric Water Vapour in the Tropics, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2020-1191, in review, 2020.

A great dive into the depths of aerosol dynamics for the Harvard SCoPEx experiment in Sweden, which as everyone knows has just been postponed until 2022. As usual reviewer 2 is right at the heart of the divisive issue of research in this area. See below for the article Colleen has been working on for several years. 

Comments please as usual to twitter @reviewer2geo or @geoengineering1 or clare_nomad_geo

https://keith.seas.harvard.edu/people/colleen-golja

Aerosol Dynamics in the Near Field of the SCoPEx Stratospheric Balloon Experiment

C. M. Golja  L. W. Chew  J. A. Dykema  D. W. Keith

First published: 01 February 2021

https://doi.org/10.1029/2020JD033438