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Conference Paper

Measurements of mixed pahase layer cloud at High Latitudes

Authors

Choularton,  Thomas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gallagher,  Martin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Bower,  Keith
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lloyd,  Gary
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Flynn,  Michael
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Murray,  Benjamin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Choularton, T., Gallagher, M., Bower, K., Lloyd, G., Flynn, M., Murray, B. (2023): Measurements of mixed pahase layer cloud at High Latitudes, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1572


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018034
Abstract
Measurements were made in 2 sets of cold air outbreaks using the UK FAAM BAE 146 research aircraft. The first set were performed in March 2022 over the Eastern Atlantic the second set were perform in October to early November 2022 in the Western Atlantic over the Labrador Sea . In each set of experiments the focus was to study the evolution of the cloud microphysics as influenced by Cloud condensation nuclei, ice nuclei and secondary ice processes in the stratocumulus clouds being advected southwards over progressively warmer sea until cloud break-up occurred into convective clouds. The aims were to improve the treatment of these cloud types in Global climate models and weather forecast models. A range of aerosol and cloud microphysical equipment was used in the 2 projects which will be discussed in the presentation. Analysis of the data set including a new novel Holographic instrument is still underway at the time of writing; however, some preliminary results indicate that: 1. Generally the ice crystal number concentration exceeded the ice nucleus concentrations measured at the same temperature 2. Some regions consisted entirely of super cooled water 3. A range of secondary ice particle production mechanisms were observed including ice splinter production during riming and droplet shattering on freezing after capture by ice crystals 4. Generally if the convective region was reached by the aircraft then secondary ice production was greater than in the stratocumulus region 5. Precipitation was mostly in the ice phase