PALM WRF interface

0533980 - ÚI 2021 RIV CZ eng L4 - Software
Eben, Kryštof - Resler, Jaroslav - Krč, Pavel
PALM WRF interface.
Internal code: PALM WRF interface ; 2020
Technical parameters: Systém pro transformaci meteorologických výstupů z meteorologického modelu WRF and chemického transportního modelu CAMx do mikroměřítkového modelu PALM. Model řeší transformaci veličin a jednotek, projekcí, gridu, zjemňování terénu a přizpůsobení vertikální struktury veličin, mass balancing, vyhlazování veličin a další potřebné operace a následný zápis do požadovaného formátu PIDS (PALM Input Data Standard). Systém je napsán v jazyce Python s důrazem na výkonnost a přenositelnost, využívá pouze dobře známé a široce rozšířené Python moduly. Výsledek je licencován pod licencí GPL.
Economic parameters: PALM systém dosud umožňoval meteorologické řízení pouze z mezoměřítkového modelu COSMO (DWD) nebo ze staticky předepsaných meteorologických podmínek. Tento nový systém umožňuje použít pro tento účel simulace z nejrozšířenějšího mezoměřítkového meteorologického modelu WRF. Navíc umožňuje řídit též chemické veličiny výstupy chemického transportního modelu CAMx, což dosud nebylo možné. Tím se výrazně rozšiřují možnosti meteorologicky řízených simulací v modelu PALM.
R&D Projects: GA KHP(CZ) UH0383
Institutional support: RVO:67985807
Keywords : urban climate * microscale atmospheric modelling * PALM * WRF * CAMx
OECD category: Meteorology and atmospheric sciences
https://palm.muk.uni-hannover.de/trac/browser/palm/trunk/UTIL/WRF_interface

PALM is a widely used state-of-the-art large-eddy simulation modelling system which can be turned to a sophisticated new generation urban climate model through its PALM-4U components. A realistic microscale atmospheric modelling of urban areas requires realistic meteorological driving conditions. These spatially and temporally complex values are usually obtained from simulations of mesoscale meteorological models. The outputs of these models need to be processed and adjusted to be able to serve as driving meteorological data for the microscale model PALM and this processing is the purpose of this new modelling tool. The WRF model is a world-wide used mesoscale meteorological model. It is an open source model developed by a worldwide community led and coordinated by NCAR (National Center for Atmospheric Research, USA) and it is used by many national meteorological services and other organization around the world, e.g. NCEP (National Centers for Environmental Prediction, USA). The ability to fully use its structured outputs for driving meteorology in PALM simulations is thus a necessary precondition for utilization of PALM-4U in many organizations around the world. Besides the WRF data, the tool allows also optional processing of the outputs of the chemical transport model CAMx (Environ, USA) to PALM driving chemistry conditions. This enables performing realistic chemical analysis in the PALM embedded chemistry model. The adaptation of meteorological data from WRF to PALM does not only represent transformation of the formats and horizontal and vertical interpolation between the grids and projections. It represents a complex process including e.g. calculation of PALM required values from WRF values, refinement of the vertical structure of quantities with respect to the terrain of the fine PALM grid, mass balancing of the quantities, Gaussian smoothing of selected values and other tasks. Moreover, the system processes a large amount of data thus the performance represents also a challenge. The system has been written in the Python language. With respect to portability, it uses only the well known and widely used packages for data processing and meteorological data processing (NumPy, SciPy, PyProj, MetPy). The system can thus be easily implemented in user’s own computational environment. The system PALM WRF interface has been published under the GNU GPL license version 3 and it has been recently included in the standard PALM system distribution through the PALM SVN system. The current version is 3.1.
Permanent Link: http://hdl.handle.net/11104/0312203


Research data: PALM - documentation