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MonoRTM is a radiative transfer model, designed to process a number or a range of monochromatic wavenumber values with high accuracy. It is particularly useful in the microwave spectral region and for atmospheric laser propogation studies. It is more accurate than LBLRTM but also much slower.

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 with 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 Turner, Kneifel, and Cadeddu (2015).