EOL Seminar: Earth, Wind and Fire: Defining the processes underlying smoke and cloud interactions over the south Atlantic

Tuesday, November 29, 2022 - 15:30 to 16:30
Contact Name: 
Jacquie Witte
Contact Email: 

"Earth, Wind and Fire: Defining the processes underlying smoke and cloud interactions over the south Atlantic"

SPEAKER: Dr. Paquita Zuidema - University of Miami

DATE: November 29, 2022

Time: 3:30 - 4:30 pm MST

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QUESTIONS: Slido will be used to answer your questions during the seminar.



The southern subtropical Atlantic Ocean, home to one of the largest subtropical marine low cloud decks on the planet, is strongly coupled to the African continent to its east. Southern Africa contributes approximately one-third of the global fire emissions, stemming mostly from the burning of grasslands and savannahs. The biomass-burning aerosols can be brought over the Atlantic ocean, where the aerosols interact both radiatively and microphysically with the low cloud deck. Model estimates of the regional net radiative impact on climate have varied both in magnitude and even sign. This has motivated dedicated field experiments to ultimately elucidate the responsible processes. These include NASA’s Earth Venture Suborbital-2 ORACLES (Observations of Aerosols above Clouds and their interactions) aircraft campaign, which sampled a different month for each of three years; the DOE LASIC (Layered Atlantic Smoke Interactions with Clouds) surface-based ARM Mobile Facility campaign on Ascension Island for 17 months; and international sister campaigns from the UK, France and south Africa. The large campaigns ended by late 2018. Analysis during the subsequent years has refined our understanding of this region, of its novel biomass-burning aerosol characteristics and aging, and how the dominant cloud-aerosol interactions evolve over different spatial and temporal scales. I will use this talk to communicate current understanding and aim to set up a conversation on how to best address remaining questions.

For more information or questions, reach out to Jacquie Witte.