STRAT (STRucture of the ATmosphere) is designed to retreive the vertical distribution of cloud and aerosol layers in the boundary layer and through the free troposhere, to identify particle-free regions of the verticale profile and the range at which the lidar signal to becomes too attenuated for exploitation.
This program was initially developed by Yohann Morille at Laboratoire de Métrologie Dynamique.
ICARE streamlined the original code to facilitate processing in the frame of the AEROCLUB project.
ICARE provides STRAT data retrievals for 5 lidar platforms belonging to the ORAURE network namely:
For each platform, these data are available as a Level-2 daily file, formatted in the NetCDF standard format.
File Naming Convention
with<YYYY>the year of the acquistion (4 digits)<MM>the month of the acquistion (2 digits)<DD>the day of the acquisition (2 digits)<PLATFORM-NAME>the name of the lidar platform, where each underscode character
"_"has been replaced by a minus character
"-"<X-XX>the product version
By example for the platform named
SIRTA_Palaiseau with lidar data measured the March 20th, 2012, and with
1-00 as product version, the name of the generated file will be:
A STRAT run produces one NetCDF file as output, that contains miscellaneous variables. See the product information page of STRAT for more information.
Since version 1.5.0 the NetCDF file produced as output has also been updated to follow the CF-Conventions (Conventions=CF-1.6). It has been designed as a Profile Data (featureType=profile). And recommended attributes as been added in variables if necessary, namely:
Then the STRAT product generates a daily NetCDF file for each platform.
flag variable streamlines the layer distribution results. It provides a classification of the layers along the lidar profile namely:
cbh variable contains the altitude of Cloud Base Height along the LIDAR signal.
mld variable contains the altitude of the Mixing Layer Depth (best estimated) along the LIDAR signal.