1/5 How to improve models used for solar geoengineering?

New @AGU_Eos paper by the steering committee of the Geoengineering Modeling Consortium (GMRC) What's GMRC? We are a science community consortia anchored at NCAR

eos.org/science-update…
2/5 GMRC aims to identify weaknesses in geophysical models used for solar geoengineering and then develop collaborative efforts to improve the models.

Our next event (May 5th) is on the NAS report that will be released Thursday
cgd.ucar.edu/projects/gmrc/
3/5 PiG in the GCM? An example, of one of model improvements I happen to be working on. Aerosols or aerosol precursors would most plausibly be released into the stratosphere by aircraft. Observations show that stratospheric plumes are coherent for >10 days.
4/5 Models now assume all material is instantly mixed into the model grid-cell missing the plume processing that will determine particle size distribution keith.seas.harvard.edu/files/tkg/file…
5/5 This artificial mixing problem can be addressed by using a Plume-in-Grid model (PiG). E.g. agupubs.onlinelibrary.wiley.com/doi/full/10.10….
My student Hongwei Sun is working to build a PiG into GEOS-chem. Ultimately models for stratospheric solar geo might use a PiG in a GCM.

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More from @DKeithClimate

15 Mar
1/13 Is solar geoengineering like nuclear weapons?

In critiquing the SCoPEx experiment Ray Pierrehumbert @ClimateBook compared our work to helping North Korea get nuclear weapons.

So, time for thread #2 debunking solar geoengineering's BS mountain

2/13 This is not personal. Ray, you are an amazing scholar & human. In the early '90s helped me on meridional energy transport. We have enjoyed dinners talking about shared love of the northern wilds. I am jealous of your musical ability, and wish to count you a friend.
3/13 But, Ray, do you truly think our experiment is as bad as if we were helping a crazed dictator get nuclear weapons?

Nuclear weapons threaten to burn us alive without warning. They are machines of death:

Read 14 tweets
12 Mar
1/7 Geoengineering droughts?

Thread #1 debunking solar geoengineering's BS mountain

Search geoengineering & drought, you get's ~0.5 million google hits and 1,696 news articles in Nexis starting with a 1991 Newsweek article.

Must be some facts underneath?
2/7 The '91 Newsweek article reported that US National Academy has endorsed research on solar geoengineering. It mentioned drought as a climate risk and geoengineering as an uncertain and potentially risky way to ameliorate such risks. Other '90s articles have a similar take.
3/7 Yet, most recent articles with "drought & geoengineering" describe drought as a risk of geoengineering rather than climate risk that geoengineering might ameliorate.

This shift must be the result of new science. Right?

Wrong.
Read 10 tweets
25 Oct 19
1/3 Cheap intermittent solar power can make carbon-neutral hydrocarbons: high-energy fuels that are easy to store and use. My 12 min talk at Royal Society #CodexTalks describes a low-risk fast path to industrial-scale solar-fuels
2/3 Background: Carbon-Neutral Hydrocarbons keith.seas.harvard.edu/publications/c…. Recent work on renewable hydrogen nature.com/articles/s4156…. H2 will win in some markets, but it has many disadvantages as a fuel. The big $$$ is getting to H2, once there, why not go to hydrocarbons with DAC?
3/3 I am *so* proud of @CarbonEngineering, but..

This is NOT about one company. It’s about an energy pathway that could grow to >10% of global primary energy before mid-century, allowing intermittent solar energy to energize heavy transport and other hard-to-decarbonize sectors.
Read 4 tweets

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