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  How important are secondary ice processes – preliminary results from FOR-ICE

Ickes, L., Surós, M. C., Eriksson, P., Frostenberg, H., Georgakaki, P., Gonçalves Ageitos, M., Lewinschal, A., May, E., Nenes, A., Neubauer, D., Pérez García-Pando, C., Proske, U., Sotiropoulou, G. (2023): How important are secondary ice processes – preliminary results from FOR-ICE, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3207

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020411 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020411_1
Genre: Conference Paper

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 Creators:
Ickes, Luisa1, Author
Surós, Montserrat Costa1, Author
Eriksson, Patrick1, Author
Frostenberg, Hannah1, Author
Georgakaki, Paraskevi1, Author
Gonçalves Ageitos, Maria1, Author
Lewinschal, Anna1, Author
May, Eleanor1, Author
Nenes, Athanasios1, Author
Neubauer, David1, Author
Pérez García-Pando, Carlos1, Author
Proske, Ulrike1, Author
Sotiropoulou, Georgia1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Global climate models poorly represent mixed-phase clouds in a realistic way, which leads to uncertainties in cloud radiative forcing and precipitation. In the FORCeS ice experiment (FOR-ICE) we compare three global climate models (ECHAM-HAM, NorESM, EC-Earth) and show which processes are crucial for a realistic representation of cloud ice and supercooled water in each global climate model framework using the factorial method as a statistical approach. A specific focus of the experiments is on secondary ice production (SIP) - which apart from one mechanism (rime splintering) is not represented in models, even if observations of ice crystal concentrations of ice crystal number in warm mixed-phase clouds often exceed available ice nuclei by orders of magnitude. We evaluate the importance of three SIP mechanisms combined (rime splintering, ice-ice collisions, and droplet shattering) compared to all other processes that can modulate ice mass and number in mixed-phase clouds: ice nucleation, sedimentation, and transport of ice crystals, and the Wegener-Bergeron-Findeisen process. To describe SIP we adopt two approaches: an explicit microphysical representation of the processes, and a parameterization based on a random forest regression of high-resolution two-year simulations in the Arctic using the polar Weather Research and Forecast model (polar-WRF). Satellite observations are used to evaluate if including descriptions of SIP leads to a more realistic representation of mixed-phase clouds.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-3207
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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: -