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  Aerosol-ice interactions in Southern ocean clouds

McCluskey, C., Medeiros, B., Davis, I., Hannay, C., Nusbaumer, J., DeMott, P., McFarquhar, G., Mace, G., Protat, A., Marchand, R., Alexander, S., Riihimaki, L., Gettelman, A. (2023): Aerosol-ice interactions in Southern ocean clouds, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1024

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018225 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018225_1
Genre: Conference Paper

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 Creators:
McCluskey, Christina1, Author
Medeiros, Brian1, Author
Davis, Isaac1, Author
Hannay, Cecile1, Author
Nusbaumer, Jesse1, Author
DeMott, Paul1, Author
McFarquhar, Greg1, Author
Mace, Gerald1, Author
Protat, Alain1, Author
Marchand, Roger1, Author
Alexander, Simon1, Author
Riihimaki, Laura1, Author
Gettelman, Andrew1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: While biases in simulated Southern Ocean (SO) shortwave radiative fluxes have improved in CMIP6 compared to CMIP5 models, there are remaining concerns regarding SO mixed phase clouds due to their important role in the climate system. Recent modeling studies come to opposing conclusions as to whether ice nucleation (IN) has a strong impact on SO shortwave cloud forcing. This study aims to investigate these conflicting findings using modeling and observations.In this work, we have implemented a deterministic immersion freezing ice nucleating particle (INP) scheme that includes contributions from mineral dust and marine sources into the Community Earth System Model version 2 (CESM2). This deterministic INP scheme replicates SO INP observations in the marine boundary layer with important sensitivities to modeled dust aerosol aloft. Simulated top-of-atmosphere cloud properties were minimally influenced by changes to the INP scheme. We investigated contributions of simulated cloud microphysical processes to the mass and number budgets in SO cloud regimes in the CESM2. Cloud regimes are identified based on cloud optical depth and altitude from satellite observations and simulated clouds sampled using the CFMIP Observation Simulator Package (COSP). This cloud regime clustering analysis allows for an assessment of cloud aerosol-ice processes in specific cloud regimes in CESM2. Results from these model experiments and analyses reveal the extent to which INPs control ice formation in specific cloud regimes in CESM2 and will be discussed in the context of recent SO field campaign observations.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1024
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -