== WP-P2.1: 3D radiation and course grid techniques
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=== Goals of the project:
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We will implement an alternative three-dimensional radiation scheme to enhance the calculation of the longwave divergence within the urban canopy yielding a more realistic description of the cooling of air in a city during nighttime. In addition, this scheme considers the air constituents in the urban canopy layer and the three-dimensional casting of shadows from clouds.
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=== Tasks of the project:
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WP-P2.1: Implementation of buildings in the 3D-radiative transfer model '!TenStream' and the validation against the benchmark Monte-Carlo model MYSTIC and coupling of the 3D radiative transfer model to the PALM-4U model.

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=== Project structure:
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This work package is conducted at LMU, Munich in close cooperation with [UC]² partners at HUB (Salim, Schubert).

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=== Deliverables:
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DL1 (month 18): Implementation of buildings in the TenStream modelDL2 (month 24): Evaluation and comparison against MYSTIC

DL3 (month 30): Coupling of the Tenstream model to PALM-4U
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=== Progress so far:
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In a first step, we enhanced MYSTIC to be able to compute complex buildings and did a study on the influence of said complex surfaces in urban canopies.
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=== References:
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'''Emde, Buras, Kylling, Mayer, Gasteiger, Hamann, Richter, Pause, Downling, Bugliaro,''' 2016, The libRadtran software package for radiative transfer calculations (version 2.0.1), Geoscientific Model Development, https://doi.org/10.5194/gmd-9-1647-2016.

'''Jakub, F., Mayer, B.,''' 2015, A three-dimensional parallel radiative transfer model for atmospheric heating rates for use in cloud resolving models—The TenStream solver, Journal of Quantitative Spectroscopy and Radiative Transfer. Elsevier BV 163: 63–71. https://doi.org/10.1016/j.jqsrt.2015.05.003.
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=== Contacts:
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bernhard.mayer@physik.uni-muenchen.de

fabian.jakub@physik.uni-muenchen.de

sebastian.schubert@geo.hu-berlin.de