On the dependence of UV-VIS-NIR incoming spectra on the cloud base height in 
high surface albedo conditions

Calì Quaglia, Filippo; Meloni, Daniela; Muscari, Giovanni; Di Bernardino, Annalisa; Di Iorio, Tatiana; Pace, Giandomenico; Schmidt, Sebastian; di Sarra, Alcide

doi:10.57757/IUGG23-1445

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On the dependence of UV-VIS-NIR incoming spectra on the cloud base height in high surface albedo conditions

Authors

Calì Quaglia, Filippo
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

Di Bernardino, Annalisa
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Di Iorio, Tatiana
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

di Sarra, Alcide
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Calì Quaglia, F., Meloni, D., Muscari, G., Di Bernardino, A., Di Iorio, T., Pace, G., Schmidt, S., di Sarra, A. (2023): On the dependence of UV-VIS-NIR incoming spectra on the cloud base height in high surface albedo conditions, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1445

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017155

Abstract

Clouds are one of the less understood Earth's system components. In the Arctic, clouds play a fundamental role in many processes, and their characterization is crucial for the understanding of regional climate, ice melting, radiative budget, and related processes. Arctic cloud optical properties are measured from ground-based and space-borne instruments, but high surface reflectance values, a widespread condition at high latitudes but in general for snow and ice-covered regions, pose severe limitations to the application of many retrieval algorithms. These aspects have been investigated based on measurements made with a UV-VIS-NIR (300-950 nm wavelength range) spectrometer at the Thule High Arctic Atmospheric Observatory (76.5° N, 68.8° W, http://www.thuleatmos-it.it/) on the northwestern coast of Greenland. Continuous measurements are available for the 2022 season (March to September). In combination with radiation transfer simulations carried out with the libRadtran package, different retrieval algorithms for estimating the cloud optical thickness (COT) have been tested and compared. In addition to the spectral measurements, the information on the cloud base height provided by a ceilometer has been included to address the challenges posed by the high reflectance surfaces. Sensitivity studies on COT retrievals in different atmospheric and surface conditions will be presented, along with a case study.