apply_tccon_insitu_correction

Purpose

apply_tccon_insitu_correction has a single purpose, that is to apply a scalar divisor scale factor to specific column-average quantities. This is typically used to ensure that these quantities are tied to the same metrological scale as comparable in situ data.

Examples

This program requires two arguments: a path to a file defining the scaling corrections and a path to either a .vav.ada file, created by apply_tccon_airmass_correction:

$GGGPATH/bin/apply_tccon_insitu_correction CORRECTION_FILE VAV_ADA_FILE

The CORRECTION_FILE will usually be one of those supplied with GGG, in the $GGGPATH/tccon subdirectory. See the configuration section for the details of this file's format if you need to modify one or create your own.

Use in TCCON standard processing

For TCCON standard processing, the CORRECTION_FILE must be $GGGPATH/tccon/corrections_insitu_postavg.dat, as these are the in situ correction factors derived for the required TCCON data version. It must be run on the .vav.ada file output by apply_tccon_airmass_correction. This is automatically configured in the post_processing.sh file, therefore standard users should rely on the post_processing.sh script to run the required post processing steps in the correct order.

Use in EM27/SUN standard processing

EM27/SUNs have their own in situ correction factors. These correction factors are provided with EGI-RS, and automatically added to the $GGGPATH/tccon directory when running the em27-init program included with EGI-RS. If using EGI-RS correctly, it will automatically create a post_processing.sh file with the correct post processing order for an EM27/SUN, so normal users should rely on that.