WP-P2: 3D radiation and course grid techniques

Goals of the project:

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.

Tasks of the project:

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.

Project structure:

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


DL1 (month 18): Implementation of buildings in the 'TenStream' model

DL2 (month 24): Evaluation and comparison with MYSTIC

DL3 (month 30): Coupling of the 'TenStream' model to PALM-4U

Progress so far:

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.


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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