Verlag des Forschungszentrums Jülich
JUEL-2868
Stockwell, William R.; Kley, Dieter
The Euro-RADM mechanism. A gas-phase chemical mechanism for European air quality studies.
114 S., 1994
Abstract
In this report we present the Euro-RADM gas-phase chemical mechanism which was
developed to model European atmospheric chemistry. It is based upon the Regional
Acid Deposition Model Mechanism, version 2. Organic compounds typically
measured at the Schauinsland field state were implemented into the }LAnM..2 model
using the review ofearier (1990). The primary chemistry ofthe measured VOCs and
the yields of the secondary products were added to the RADW.L2 mechanism using the
Carter review. The secondary chemistry ofRADW.L2 remained unchanged except that
the chemistry of the peroxy radical reactions was modified to account for the new
product yields and the chemistry of PAN was updated to be consistent with recent
laboratory measurements.
The Euro-RADM mechanism is a much more complete parameterization of organic
chemical species found at European field stations. A completely explicit approach
would require the addition of an extremely large number of species to the mechanism.
An explicit approach would not be practical because many of the required reactions
and species have not been measured in laboratory experiments and the explicit
mechanism would be too expensive and difficult to implement in a current 3-d
transport/transformation model. The Euro-RADM mechanism was developed
according to the principle that a mechanism should be no more detailed than justified
by both laboratory and field measurement data.
Laboratory and field measurement data are used to develop atmospheric chemical
mechanisms. All mechanisms are in constant need of correction and improvements
due to new scientific data. A priority for future development is to incorporate the
most recent LACTOZ results into the Euro-RADM model. Recent LACTOZ results
on the production of peroxides from the reactions of ozone and N03 with alkenes
needs to be included in revised versions of the Euro-RADM mechanism. Aromatic
oxidation reactions present an especially difficult problem because the secondary
reactions of aromatics are poorly understood. Additional experimental data will be
required before a completely reliable parameterization of aromatic chemistry can be
incorporated into atmospheric chemistry mechanisms.
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