So proud of this work that @jesswan15 and all our co-authors did for the 1st chapter of her dissertation! Thank you to the @NCAR_Science Early Career Faculty Innovators program for making this work possible.

☁️ New study on marine cloud brightening out in @NatureClimate ☁️ Regional marine cloud brightening (MCB) in the North Pacific reduces extreme heat over the Western U.S. under present-day conditions but becomes ineffective under mid-century warming. https://t.co/OVZMVKuTYq

Analysis dispels the idea that efforts to combat climate change and poverty are incompatible. But as Kate Ricke and @gcmccord explain, climate-smart measures will be essential to keep cumulative emissions low.

Our new paper about Air Quality Equity in US Climate Policy is out today in @PNASNews! The figure highlights the pervasiveness of national and state-level air pollution disparities. But can climate policy change this pattern? See🧵below or paper here: https://t.co/rNP4eGlHiv

18 of the African scientists funded by the @DegreesNGO wrote a response to this piece that @nytopinion refused to publish. but you can find their response below. (2/5) https://t.co/8whF71wFAL

really honored to have been asked by @nature to provide my thoughts on solar geoengineering. my take is about the need for pragmatism

Climate scientist and professor at @GPS_UCSD and @Scripps_Ocean, @katericke takes a look at the potential powers and pitfalls of geoengineering in response to climate change, along with @sktalati, @PeterFrumhoff and @Eaterofsun ⬇️

📢New paper out today!📢 Disparate air pollution reductions during California’s COVID-19 economic shutdown by a wonderful group of equal contributors - Richard Bluhm, @khemesphere, @LC_Sanford, @SusiABenz, @morganclevy, @katericke, and @jaburney 🧵👇 Link: https://t.co/6kGFZLwEu1

So excited to @Capi_Planeta is coming to @Scripps_Ocean !

Today is the last day to vote for our @SXSW panel on climate geoengineering featuring climate scientists @katericke & @PeterFrumhoff, with journalist Oliver Morton (@Eaterofsun) from The Economist as moderator. Help us by sharing or “Voting Up”! ⬆️ https://t.co/7HGuS7ZMdH #SXSW

I think our paper shows that the possibility of hitting pressure points in the Earth’s climate system may be under explored in the geoengineering literature.

People I’ve talked to often dismiss regional geoengineering approaches as either (1) unlikely to have detectible remote effects, or, if the forcing is large enough, (2) unlikely to have impacts substantially different than globally diffuse schemes.

I was motivated in writing this paper by initiatives in Australia and China which indicate some major actors are considering what might be considered regional geoengineering. Geopolitically, are regional schemes more likely than a more globally coordinated, technocratic approach?

We include a feasibility scoping analysis to see if cooling the Indian Ocean on this scale is w/in the realm of possibility. Short answer- in theory-yes, but the energy & infrastructure would likely be very costly and require a major actor to implement

Unsurprisingly, an intervention large enough to reverse a drought across an entire region of Africa is also large enough to cause substantial side effects elsewhere, e.g., a large decrease in rainfall in Tanzania:

While we were able to restore annual mean precipitation to pre-drought levels, the seasonal distribution changed and the intervention was less effective in the quasi-realistic simulations than in the idealized ones:

We designed this intervention using idealized slab ocean model simulations and then applied the derived climate response in more realistic historical simulations in order to “reverse” the 1970s-80s drought in the Sahel.

We exploit an extensively studied link between Indian Ocean sea surface temperatures (SSTs) and precipitation in the Sahel region of Africa, cooling SSTs with artificial upwelling (ocean pipes) to increase Sahel rainfall. (w Maria Rugenstiein, Detelina Ivanova and Taylor McKie)

Our new paper in Geophysical Research Letters, “Reversing Sahelian Droughts,” is, to my knowledge, the first to explore the idea of trying to geoengineer a climate teleconnection:

Polonik et al. present a new approach to climate decision‐making that centers the implications of anthropogenic aerosol particulate emissions on climate & human health. Check out this @EarthsFutureEiC article: https://t.co/RaL7ghWd4J #AGUPubs @PascalPolonik @jaburney @katericke