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The Shedding Light On Cloud Shadows project: measuring and simulating surface solar irradiance under broken clouds

Authors

Van Heerwaarden,  Chiel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

van Stratum,  Bart
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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

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

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Citation

Van Heerwaarden, C., Mol, W., Veerman, M., van Stratum, B., Tijhuis, M., Heusinkveld, B. (2023): The Shedding Light On Cloud Shadows project: measuring and simulating surface solar irradiance under broken clouds, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4172


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021611
Abstract
Clouds trigger large fluctuations in solar surface irradiance. The incoming radiation in shadows is almost an order of magnitude less than under clear sky, while peaks near clouds shadows can sometimes reach a 50% increase with respect to clear sky, due to scattering of sunlight in cloud edges. Performing cloud-resolving simulations with realistic surface solar irradiance patterns under broken clouds remains a challenge. To overcome this challenge, we need to develop fast methods that accurately capture the 3D nature of radiation-cloud-surface interactions, and to develop these methods, we need field observations of surface solar irradiance that capture individual cloud shadows at sufficiently high resolution (~50 m). The Shedding Light On Cloud Shadows (SLOCS) project (https://chiel.ghost.io/slocs) addresses these objectives by gathering spatial observations in a spatial grid fine enough to capture individual clouds with a novel instrument, and by further developing 3D radiative transfer solvers for cloud-resolving models with optimal balance between detail level and performance. The FESSTVaL campaign in Lindenberg, Germany in summer 2021 provided a unique opportunity to measure surface solar irradiance around cloud shadows. In FESSTVaL, we performed grid measurements of radiation, while benefiting from complementary boundary-layer and cloud observations of other institutes. We used those observations to set up a series of cloud-resolving simulations with MicroHH. With those simulations, we evaluated two newly-developed radiative transfer solvers: 1) a GPU ray tracer fast enough to be coupled to our cloud-resolving model and 2) a solver that postprocesses the outcome of a 1D two-stream solver to include 3D effects.