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Calculation of single-scattering properties of quasi-spherical ice crystals observed in deep convective clouds

Urheber*innen

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

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

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

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

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

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

Lee,  Seoung Soo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Jung,  Chang Hoon
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lim,  Kyo-sun
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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Zitation

Kim, J., Um, J., Baran, A., McFarquhar, G., Magee, N., Cha, J., Lee, S. S., Jung, C. H., Lim, K.-s., Park, S. (2023): Calculation of single-scattering properties of quasi-spherical ice crystals observed in deep convective clouds, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-2852


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019031
Zusammenfassung
Deep convective clouds (DCCs) are characterized by their extensive temporal and spatial coverage. These clouds have a significant impact on the balance of the Earth’s radiation. To quantify the impact of DCCs on the Earth’s radiation, we need to obtain the microphysical and single-scattering properties of the ice crystals in DCCs. There are multiple observations showed that quasi-spherical single frozen droplets (SFD) which were formed by homogeneous freezing and frozen droplet aggregates (FDA), were the common features in DCCs. Based on this, idealized models representing the SFD and FDA were developed using Gaussian random spheres (GSs) and droxtals. Habit mixture models (i.e., mixtures of GSs and droxtals) were also developed. Scattering-phase function P11 and asymmetry parameter g as single-scattering properties were calculated for idealized models using a geometric optics method at the operating wavelength (i.e., 0.80 μm) of a polar nephelometer (PN). The calculated single-scattering properties were compared with those obtained by the PN during the 2007 Cirrus Cloud Experiment field campaign. The accuracy of theoretically calculated single-scattering properties was determined by calculating a root mean square error (RMSE) between the theory and the in-situ measurements. It was found that the single-scattering properties of SFD and FDA models with identical components could not reproduce the in-situ measurements. Overall, the habit mixture models minimized the differences in P11 and consequently, provided better agreement with the in-situ estimated g. The average RMSE of the habit mixture models decreased by down to 19% compared with those of the SFD and the FDA models.