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\newpage
\appendix
\onecolumn
\section{FLEXPART sample input files}
\subsection{The pathnames file}
A file \verb|pathnames| must exist in the directory where FLEXPART is started.
It states the pathnames (absolute or relative) of input and output files:
\begin{footnotesize}\begin{verbatim}
/home/as/FLEXPART50/options/
/volc/as/contrace/modelresults/forward/
/volc/windcontrace/
/volc/windcontrace/AVAILABLE
/volc/nested/
/volc/nested/AVAILABLE
============================================
Line 1: path where control files "COMMAND" and "RELEASES" are available
Line 2: name of directory where output files are generated
Line 3: path where meteorological fields are available (mother grid)
Line 4: full filename of "AVAILABLE"-file (mother grid)
Subsequent lines:
Line 2n+3: path where meteorological fields are available (nested grid n)
Line 2n+4: full filename of "AVAILABLE"-file (nested grid n)
Line below last pathname must be:
============================================
The grids must be arranged such as that the coarse-scale nests
come before the fine-scale nests. Multiple nests of the same
nesting level are allowed. In that case, the order is arbitrary.
\end{verbatim}\end{footnotesize}
\newpage
\subsection{Files in directory windfields}
The directory where the meteorological input data are stored, here called
\verb|windfields| (\verb|/volc/windcontrace/| in the above example
\verb|pathnames| file), contains grib-code files containing the ECMWF data.
All meteorological fields must have the same structure, i.e. the same
computational domain and the same resolution. An example listing of this
directory is given below.
\begin{footnotesize}\begin{verbatim}
AVAILABLE EN01102806 EN01102815
EN01102800 EN01102809 EN01102818
EN01102803 EN01102812 EN01102821
\end{verbatim}\end{footnotesize}
The file names of the grib-code files and their validation dates and times (in UTC) must be listed in the file \verb|AVAILABLE|. While it is practical to have this file reside in the same directory as the wind fields, this is no necessity and it can also be located elsewhere, as its file name is also given in the \verb|pathnames| file.
\begin{footnotesize}\begin{verbatim}
DATE TIME FILENAME SPECIFICATIONS
YYYYMMDD HHMISS
__________________________________
20011028000000 EN01102800 ON DISC
20011028030000 EN01102803 ON DISC
20011028060000 EN01102806 ON DISC
20011028090000 EN01102809 ON DISC
20011028120000 EN01102812 ON DISC
20011028150000 EN01102815 ON DISC
20011028180000 EN01102818 ON DISC
20011028210000 EN01102821 ON DISC
\end{verbatim}\end{footnotesize}
Since version 7.0, FILENAME can be up to 256 characters long. Thus, the path
to a file can be directly placed in the AVAILABLE file. If this feature is
used, line 3 in the \verb|pathnames| file should be left empty.
\begin{footnotesize}\begin{verbatim}
DATE TIME FILENAME SPECIFICATIONS
YYYYMMDD HHMISS
__________________________________
20011028000000/work_disk/data/EN01102800 ON DISC
20011028030000/work_disk/data/EN01102803 ON DISC
20011028060000/work_disk/data/EN01102806 ON DISC
20011028090000/work_disk/data/EN01102809 ON DISC
20011028120000/work_disk/data/EN01102812 ON DISC
20011028150000/work_disk/data/EN01102815 ON DISC
20011028180000/work_disk/data/EN01102818 ON DISC
20011028210000/work_disk/data/EN01102821 ON DISC
\end{verbatim}\end{footnotesize}
Nested wind fields must be stored in one or more different directory/ies, as specified in the \verb|pathnames| file.
\newpage
\subsection{Files in directory options}
The files in directory \begin{footnotesize}\verb|options|\end{footnotesize} are used to specify the model run.
An example listing of \begin{footnotesize}\verb|options|\end{footnotesize} is given below.
\verb|surfdepo.t| gives the resistances needed for the parameterization of dry deposition of gases for the 13 landuse classes and five seasonal categories.
