= Chemistry model parameters =
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Since Version 5.0 a chemistry model is available in PALM which computes chemical conversion and tranport of reactive trace gases. In addition this module permits also the Simulation of passive compounds in the gas phase and particulate matter. 

The module chem_gasphase_mod.f90, where the gas phase chemistry rate equations are solved within PALM4U depends on the chosen chemical mechanism. chem_gasphase_mod.f90 is generated by a preprocessor that is based on the Kinetic PreProcessor KPP (Damian et al., 2002, Sandu et al., 2006), Release 2.2.3 from November 2012 (http://people.cs.vt.edu/asandu/Software/Kpp/, kpp-2.2.3.tar.gz) and an adapted version of the KPP postprocessor KP4 (Jöckel et al, 2010), which converts the KPP-generated code to a PALM4U module. Currently PALM-4U includes the following sample of chemistry mechanisms:
CBM4: Carbon Bond Mechanism (Gery et al. 1989, 32 compounds, 81 reactions)
SMOG: Photochemical smog mechanism (13 compounds, 12 reactions)
SIMPLE: Simplified of SMOG (9 compounds, 7 reac-tions)
PHSTAT: Photo-stationary state (3 compounds, 2 reactions)

Additionally 'mechanisms' are availble that describes the transport of one and two passive tracers 
PASSIVE1: Passive tracers (1 compound, 0 reactions).
PASSIVE: Passive tracers (2 compounds, 0 reactions).


A brief description of the chemistry model will follow here (see [wiki:doc/app/lsmpar#LandSurfaceParameters LSM description] as an example).

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NAMELIST group name: [=#chempar '''chemistry_parameters''']\\
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[=#steering '''Steering:]\\
||='''Parameter Name'''  =||='''[[../fortrantypes|FORTRAN]]\\[[../fortrantypes|Type]]'''  =||='''Default\\Value'''  =||='''Explanation'''  =||
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{{{#!td style="vertical-align:top; width: 150px"
[=#cs_surface '''cs_surface''']
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{{{#!td style="vertical-align:top; width: 50px"
R
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{{{#!td style="vertical-align:top; width: 75px"
0.0
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{{{#!td
Concentration value for chemical species at the surface.\\\\
Here, a detailed description follows...Maybe also link to an example input file.
}}}
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