Quantifying the impacts of marine aerosols over the southeast Atlantic Ocean using a chemical transport model: implications for aerosol–cloud interactions

Hossain, Mashiat; Garland, Rebecca M.; Horowitz, Hannah M.

doi:https://doi.org/10.5194/acp-24-14123-2024

Articles | Volume 24, issue 24

https://doi.org/10.5194/acp-24-14123-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

New observations and related modelling studies of the aerosol–cloud–climate...

https://doi.org/10.5194/acp-24-14123-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 24

Research article

|

19 Dec 2024

Research article |

| 19 Dec 2024

Quantifying the impacts of marine aerosols over the southeast Atlantic Ocean using a chemical transport model: implications for aerosol–cloud interactions

Mashiat Hossain, Rebecca M. Garland, and Hannah M. Horowitz

Data sets

Suite of Aerosol, Cloud, and Related Data Acquired Aboard P3 During ORACLES 2017, Version 2 ORACLES Science Team https://doi.org/10.5067/Suborbital/ORACLES/P3/2017_V2

FAAM C056 CLARIFY flight: Airborne atmospheric measurements from core instrument suite on board the BAE-146 aircraft CEDA http://data.ceda.ac.uk/badc/faam/data/2017/c056-sep-09

ACSM, corrected for composition-dependent collection efficiency (ACSMCDCE) Atmospheric Radiation Measurement (ARM) user facility https://doi.org/10.5439/1763029

Model code and software

geoschem/GCClassic: GEOS-Chem 13.3.3 The International GEOS-Chem User Community https://doi.org/10.5281/zenodo.5748260

Short summary

Our research examines aerosol dynamics over the southeast Atlantic, a region with significant uncertainties in aerosol radiative forcings. Using the GEOS-Chem model, we find that at cloud altitudes, organic aerosols dominate during the biomass burning season, while sulfate aerosols, driven by marine emissions, prevail during peak primary production. These findings highlight the need for accurate representation of marine aerosols in models to improve climate predictions and reduce uncertainties.