This option allows to change the temperature and pressure profile, and optionally to specify one or more density profiles. The entry in the input file looks like this:
radiosonde filename [gas_species] [unit] ...
Currently the following gas_species are included: ozone (O3), nitrogen dioxide (NO2), water vapor (H2O), bromine oxide (BRO), chlorine dioxide (OCLO), formaldehyde (HCHO), and carbon dioxide (CO2). Each gas species is identified by its abbrevations given in parentheses above. Unit is an optional argument to defines the unit of the density. The profiles can be given in particles per cm$ ^3$ (CM-3), in particles per m$ ^3$ (M-3), as volume mixing ratio (VMR), as mass mixing ratio in kg/kg (MMR), or as relative humidity (RH) (only for water). The default unit is RH for water vapour, MMR for ozone, and CM3 for all other gases. The radiosonde file must have (2 + number of gases) columns:
1

pressure in hPa
2

temperature in Kelvin
3

, 4 ... density of trace gas in the specified unit
A new z-grid will be calculated, starting at altitude and assuming a linear temperature variation between levels. The air density will be recalculated according to the ideal gas law, and the density of the well mixed gases O2 and CO2 will be scaled accordingly. The atmospheric data above the radiosonde data is taken from the atmosphere_file level by level, starting at the first pressure level above the radiosonde data. The z-grid of the atmosphere file in this height region is shifted accordingly. Also if the density in the radiosonde file is specified as -1 at a level, the value from the atmosphere_file is used. Possible calls are
radiosonde ../examples/radiosonde.dat
just in order to change the temperature and pressure profile, or
radiosonde ../examples/radiosonde2.dat H2O RH O3 MMR NO2
where water vapour density will be given as relative humidity, ozone as mass mixing ratio, and NO2 in cm$ ^{-3}$ (default).





Arve Kylling 2010-03-10