MonoRTM is a radiative transfer model, designed to process one or a number of monochromatic wavenumber values.  It is particularly useful in the microwave spectral region.  It is also applicable for atmospheric laser propogation studies.

MonoRTM attributes include:

• utilizes the same physics and continuum model as the Line-by-line Radiative Transfer Model, LBLRTM.

• suitable for the calculation of radiances associated with atmospheric absorption by molecules in all spectral regions and cloud liquid water in the microwave

• applicable to a range of viewing geometries

• spectral validity depends only on the spectral region covered by the spectral lines provided in the line parameter database file

• the Monochromatic Optical Depth Model (MODM) module is the core component of MonoRTM, dedicated to the calculation of the molecular optical depths

• uses the MT_CKD continuum to handle molecular absorption not included in "line center" of each spectral line [Clough et al., 2005; Clough et al., 1989]

• includes line coupling effects [Hoke et al., 1989], which are important for oxygen lines in the microwave region [Tretyakov et al., 2005; Caddedu et al., 2007] and for CO2 in infrared regions [Niro et al., 2005].

• uses the Humlicek Voigt Line Shape [J. Humlicek, 1982]

• cloud liquid water absorption in the microwave is calculated using a model developed by the Liebe, Hufford and Manabe [1991]

Atmospheric and Environmental Research