MDTERP MarylanD TErrestial Radiation Package A Narrow-Band Longwave Radiation Model with a Graphical User Interface Robert G. Ellingson and Ezra Takara.

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Presentation transcript:

MDTERP MarylanD TErrestial Radiation Package A Narrow-Band Longwave Radiation Model with a Graphical User Interface Robert G. Ellingson and Ezra Takara Department of Meteorology University of Maryland College Park, MD Available after 1 April 1999 from

MDTERP - Description Quantities Calculated Spectral radiance as F(wavenumber, nadir angle and altitude) Upward, downward and net upward fluxes and heating rates as F(wavenumber and altitude) Assumptions/Features Plane parallel, LTE, black surface and five angles in each hemisphere Molecular absorption by H2O, CO2, O3, CH4, N2O (1992 HITRAN) 10 cm -1 resolution from 0 to 3000 cm -1 Transmittances for for all gases fitted to LBLRTM (H2O - empirical model; others - Malkmus model) Fluxes and heating rates calibrated with LBLRTM As many as six cloud layers (black in current version) User control of input data, calculation levels, & cloud positions User selectable graphical and/or text output

MDTERP Uses a Graphical User Interface Available for Macintosh® Power PC platforms Platforms with Interactive Display Language ® (IDL ) and a Fortran 90 compiler Requirements Macintosh® - 12 MB RAM; 2 MB free disk space IDL - 10 MB RAM; 8 MB free disk space Tests to Date Macintosh - Power Mac 8100/80&100; several different G3 powered models IDL - DEC Alpha stations with Digital 4.0 UNIX

User selects the type of calculation, source of atmospheric data and clicks “Continue with Setup” Macintosh Use - Begin from Startup Menu AFGL - Air Force Geophysical Laboratory

Successive dialogs allow a user to select the source of data, levels of computation, and to specify the presence and location of clouds Macintosh - Default/AFGL Selection

Macintosh - Special Selection This dialog allows the user to select different profiles of temperature and gas concentration. It is possible to specify isothermal conditions and/or fixed concentrations of individual gases (including none).

Macintosh - Sensitivity Selection The user is presented with successive dialogs that allow the specification of conditions for two different cases. The model performs calculations for each case, and the interface allows a comparison of the results.

Macintosh - Perturbation Selection This dialog allows a user to add perturbations to the temperature and/or the gas concentrations used in a given profile. Either percentage or systematic offsets are permitted. The model performs calculations for each case, and the interface allows a comparison of the results.

Macintosh -When Calculations are Done, Use Menu Bar Use to select graphics of your choice Use to begin a new set of calculations Use to obtain text output Use to save text or graphics to directory of your choice

Macintosh - Flux and Cooling Rate Output Use to select spectral and altitude ranges, cloud levels, and case

Macintosh - Radiance Output Use to select direction, spectral and altitude ranges, cloud levels, and case

Macintosh - Radiance Spectral Distribution Use to graph spectral distribution of radiance at zenith (nadir) for different levels, cloud conditions, and case

Macintosh - Radiance Angular Distribution Use to plot angular distribution of radiance for different spectral intervals, levels, cloud conditions, and case

Macintosh - Cooling Rate Altitude and Spectral Distribution - Clough Diagram Use to plot spectral distribution of cooling rates for different cloud conditions and cases

Macintosh -Vertical Distribution of Fluxes and Cooling Rates Use to plot vertical distribution of fluxes and cooling rates for different spectral intervals, altitude ranges, cloud conditions and cases

Documentation/References Ellingson, R. G. and J. C. Gille, 1978: An infrared radiative transfer model: Part 1 - Model description and comparison of observations with calculations. J. Atmos. Sci., 35, Warner, J., and R. G. Ellingson, 1997: A narrow band longwave radiation model based on parameters fitted to LBLRTM. Proceedings of the 1997 ARM Science Team Meeting. Warner, J., 1997:A New Longwave Radiation Model For Application to Atmospheric Problems. Ph.D. Dissertation, University of Maryland, 189 pp. Warner, J. X., and R. G. Ellingson, 1998: A new narrow band radiation model for water vapor absorption. Submitted to J. Atmos. Sci., Sept Information regarding most of the techniques employed in the various calculations may be found in: