This is the Chevallier 91L diverse dataset in ARTS format.

Now only arts-1-1 (and newer) XML files are kept here.
arts-1-0 plain ASCII files can be derived from the svn repository
(ARTS-XML-DATA-2-1-12 and older). The files in old ARTS format might
be of interest, because this dataset should be particularly useful
for model validation, e.g., to check whether old and new ARTS give
consistent results.

The dataset documentation by Chevallier is in file
"nwp_saf_profiles91.pdf". 

The original Chevallier data and the FORTRAN extraction program that
created these files can be found in
"~sbuehler/scalc/2007_10_chevallier_91L/arts_data/"

The z profile was generated with the hydrostatic assumption from the
surface pressure and elevation. (Using the hypsometric equation from
Wallace and Hobbs.)


1. Clear sky atmospheric states
==============================

Clear-sky here refers to what is stored in the files, not the
scenarios, which do contain also cloudy cases.

The clear-sky atmospheric profiles are stored in:
chevallierl91_clear_X.xml (arts-1-1 format)

where X for the different data sets is: 
t   
q   
oz  
ccol
rcol

These files contain one matrix for each atmospheric state. (Each file
has 5000 states.) Each matrix row corresponds to one pressure
level. The meaning of the columns is:

p[Pa] T[K] z[m] H2O_VMR[1] O3_VMR[1]        



2. Cloud atmospheric states
==============================

The cloud atmospheric profiles are stored in:
chevallierl91_cloud_X.xml (arts-1-1 format)

This is the part of the atmospheric states related to
clouds. Parameters are:  

CLW[kg/m^3] CIW[kg/m^3] Rain[kg/(m2*s)] Snow[kg/(m2*s)]

CLW  : Cloud liquid water content
CIW  : Cloud ice water content
Rain : Rain rate
Snow : Snow rate


3. Full atmospheric states
==============================

The full atmospheric states are stored in:
chevallierl91_all_X.xml (arts-1-1 format)

They contain the combined information of the clear sky and cloud
atmospheric states. Parameters are:

p[Pa] T[K] z[m] CLW[kg/m^3] CIW[kg/m^3] Rain[kg/(m2*s)] Snow[kg/(m2*s)] H2O_VMR[1] O3_VMR[1]


4. Misc
========

In future, 1. and 2. might deprecate in favor of 3.

Furthermore, it is forseen to later generate for each data set:
chevallierl91_surface_X.xml

It would contain surface parameters (T, wind speed).
Then, the clear & cloud & surface or full & surface files together
would hold all state information for RT calculations with clouds and
variable surface conditions.


Let us know if anything here is unclear, so that we can fix it.

2007-10-23 Stefan Buehler
2008-05-30 Stefan Buehler
2012-07-19 Jana Mendrok