Changes between Version 1 and Version 2 of doc/tec/rtm

Timestamp:

Sep 28, 2021 8:05:48 PM (3 years ago)

Author:

pavelkrc

Comment:

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doc/tec/rtm

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-In PALM, the radiative interactions within urban canopy are solved by the separate Radiative transfer model (RTM, see [#krc2021 Krč et al. 2021]), which provides explicit 3-D modelling of multi-reflective radiative exchange among the sun, the sky, urban surfaces and resolved plant canopy, and it also provides radiative inputs for the [wiki:doc/tec/biomet Biometeorology module (BIO)] and for photolysis in the [wiki:doc/tec/chem Chemistry model (CHEM)]. The RTM is coupled to the selected [wiki:doc/tec/radiation Radiation model], which provides radiation above the urban canopy as an input.
+In PALM, the radiative interactions within urban canopy are solved by the separate Radiative transfer model (RTM, see [#krc2021 Krč et al., 2021]), which provides explicit 3-D modelling of multi-reflective radiative exchange among the sun, the sky, urban surfaces and resolved plant canopy. The RTM calculates radiative fluxes and surface net radiation including its components on the model geometry, which are then used to model the surface energy balance and evapotranspiration in the plant canopy. It also provides radiative inputs for the [wiki:doc/tec/biomet Biometeorology module (BIO)] and for photolysis in the [wiki:doc/tec/chem Chemistry model (CHEM)]. The RTM is coupled to the selected [wiki:doc/tec/radiation Radiation model], e.g. RRTMG, which provides radiation above the urban canopy as an input.
+
+The RTM version 1.0 ([#resler2017 Resler et al., 2017]) was created in order to provide an open-source, HPC-enabled, fully 3-D model of radiative interactions inside the urban canopy integrated into an urban climate model based on the large-eddy simulation (LES) method. The current version 4.1 of RTM provides substantial improvements by including a wider selection of simulated processes, new methods of discretization and improved algorithms as well as technical implementation for enhanced scalability and computational efficiency.
+
+== RTM overview ==
+
+The RTM considers two spectral ranges of electromagnetic radiation independently: shortwave (SW) visible solar radiation and longwave (LW) thermal radiation. The modelled radiation originates from the sun, the atmosphere and all the modelled surfaces. The result of RTM is the amount of absorbed, reflected and emitted radiation for every face (both horizontal and vertical) and the amount of absorbed and emitted radiation for each grid box containing resolved plant canopy (plant canopy grid box, PCGB). The model follows the radiation as it spreads from sources and as it propagates through the urban canopy layer and reflects off individual faces, taking into account model geometry, shading and mutual visibility between the faces, partial transparency and/or opacity of the plant canopy, and reflective properties of the individual faces. The following figure gives an overview of the simulated processes. The detailed study of the contribution of the particular processes to the total simulated radiative fluxes is described in [#salim2020 Salim et al. (2020)].
+
+[[Image(rtm_processes.png,826px)]]
+
 
 == References ==
+
+* [=#resler2017] '''Resler, J., Krč, P., Belda, M., Juruš, P., Benešová, N., Lopata, J., Vlček, O., Damašková, D., Eben, K., Derbek, P., Maronga, B., and Kanani-Sühring, F.''' 2017. PALM-USM v1.0: A new urban surface model integrated into the PALM large-eddy simulation model, Geosci. Model Dev., 10, 3635–3659, https://doi.org/10.5194/gmd-10-3635-2017.
+
 * [=#krc2021] '''Krč, P., Resler, J., Sühring, M., Schubert, S., Salim, M. H., and Fuka, V.''' 2021. Radiative Transfer Model 3.0 integrated into the PALM model system 6.0, Geosci. Model Dev., 14, 3095–3120, https://doi.org/10.5194/gmd-14-3095-2021.
+
+* [=#salim2020] '''Salim, M. H., Schubert, S., Resler, J., Krč, P., Maronga, B., Kanani-Sühring, F., Sühring, M., and Schneider, C.''' 2020. Importance of radiative transfer processes in urban climate models: A study based on the PALM model system 6.0, Geosci. Model Dev. Discuss. [preprint], https://doi.org/10.5194/gmd-2020-94, in review.