! EPISODE - An urban-scale air quality model
! ========================================== 
! Copyright (C) 2018  NILU - Norwegian Institute for Air Research
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!							PO Box 100
!							NO-2027 Kjeller
!							Norway
!
!							Contact persons: Gabriela Sousa Santos - gss@nilu.no
!								         Paul Hamer - pdh@nilu.no
!
! Unless explicitly acquired and licensed from Licensor under another license,
! the contents of this file are subject to the Reciprocal Public License ("RPL")
! Version 1.5, https://opensource.org/licenses/RPL-1.5 or subsequent versions as
! allowed by the RPL, and You may not copy or use this file in either source code
! or executable form, except in compliance with the terms and conditions of the RPL. 
!
! All software distributed under the RPL is provided strictly on an "AS IS" basis, 
! WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, AND LICENSOR HEREBY 
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! MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT, OR NON-INFRINGEMENT.
! See the RPL for specific language governing rights and limitations under the RPL.
!
!========================================== 
! The dispersion model EPISODE (Grønskei et. al., 1993; Larssen et al., 1994;
! Walker et al., 1992, 1999; Slørdal et al., 2003, 2008) is an Eulerian grid model 
! with embedded subgrid models for calculations of pollutant concentrations resulting 
! from different types of sources (area-, line- and point sources). EPISODE solves the 
! time dependent advection/-diffusion equation on a 3 dimensional grid. 
! Finite difference numerical methods are applied to integrate the solution forward in time. 
! It also includes extensions as the implementation of a simplified EMEP photochemistry 
! scheme for urban areas (Walker et al. 2004) and a scheme for Secondary Organic Aerosol 
! implemented by Håvard Slørdal
!
! Grønskei, K.E., Walker, S.E., Gram, F. (1993) Evaluation of a model for hourly spatial concentrations distributions. Atmos. Environ., 27B, 105-120.
! Larssen, S., Grønskei, K.E., Gram, F., Hagen, L.O., Walker, S.E. (1994) Verification of urban scale time-dependent dispersion model with sub-grid elements in Oslo, Norway. In: Air poll. modelling and its appl. X. New York, Plenum Press.
! Slørdal, L.H., McInnes, H., Krognes, T. (2008): The Air Quality Information System AirQUIS. Info. Techn. Environ. Eng., 1, 40-47, 2008.
! Slørdal, L.H., Walker, S.-E., Solberg, S. (2003) The Urban Air Dispersion Model EPISODE applied in AirQUIS. Technical Description. NILU TR 12/2003. ISBN 82-425-1522-0.
! Walker, S.E., Grønskei, K.E. (1992) Spredningsberegninger for on-line overvåking i Grenland. Programbeskrivelse og brukerveiledning. Lillestrøm, Norwegian Institute for Air Research (NILU OR 55/92).
! Walker, S.E., Slørdal, L.H., Guerreiro, C., Gram, F., Grønskei, K.E. (1999) Air pollution exposure monitoring and estimation. Part II. Model evaluation and population exposure. J. Environ. Monit, 1, 321-326.
! Walker, S.-E., Solberg, S., Denby, B. (2003) Development and implementation of a simplified EMEP photochemistry scheme for urban areas in EPISODE. NILU TR 13/2013. ISBN 82-425-1524-7
! ========================================== 
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! Modification change log
! -----------------------
! Name, institution, date : Change summary
!
! Matthias Steffen Karl, Helmholtz-Zentrum Geesthacht, 10.12.2018, see CC-sub-license_v1.2.txt
!