alcf-calibrate – Calibrate ALC backscatter.
alcf calibrate <type> [--] <time_periods> <input> <output>
Calibration based the O’Connor et al. (2004) method of lidar ratio (LR) in fully opaque stratocumulus clouds.
-- are treated as literal strings. Use this delimiter if the input or output file names might otherwise be interpreted as non-strings, e.g. purely numerical file names.
type: Lidar type (see Types below).
time_periods: File containing calibration time periods of stratocumulus clouds in the backscatter profiles (see Time periods below).
input: Input directory containing NetCDF files (the output of
output: Output calibration file.
chm15k: Lufft CHM 15k.
cl31: Vaisala CL31.
cl51: Vaisala CL51.
minimpl: Sigma Space MiniMPL.
mpl: Sigma Space MPL.
Time periods file is a text file containting start and end time (see Time format below) of a time period separated by whitespace, one time period per line:
<start> <end> <start> <end> ...
start is the start time and
end is the end time.
YYYY is year,
MM is month,
DD is day,
HH is hour,
MM is minute,
SS is second. Example:
Read time periods from
time_periods.txt, lidar profiles from the directory
lidar and write the calibration coefficient to
alcf calibrate time_periods.txt lidar calibration.txt