Genspect

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ATMtool

The Genspect ATMtool is optimized for climate and atmospheric modeling. Simulate conditions for

• Earth
• Mars
• Venus (Now Available!)

Atmtool allows the computation of downward radiance and transmission though a plane parallel atmosphere at a specified zenith angle. With our easy-to-use menu, clients can specify the number of layers (from 1 to 10) that the atmosphere will be divided into and up to three atmospheric gases at fixed mixing ratios.

Genspect will then simulate the atmosphere using the specified number of layers and atmospheric profile and compute radiative characteristics. Optionally, a blackbody-source function can also be specified. Customize blackbody temperature to model the radiance transmitted an atmosphere.

Advanced features allow clients to specify calculation accuracy, line type and line shape. Select your preferred format for results and submit your simulation for processing.

Genspect delivers graphic and data files directly to your browser within 10 minutes of submission.

Specified Accuracy Performance

Genspect is the only commercial tool to offer specified accuracy tolerances for the calculation interpolation (0.1%, or 1%); the algorithm will compute spectral absorption coefficients to this required accuracy using a near minimal number of computations.

Genspect simulations are performed on a spectral grid in wavenumber space [cm^-1], which is a measurement of frequency commonly used for spectral modeling; absorption-coefficient data are generated in corresponding units of [molecule^-1(cm^-2) ^-1].

Specifed Line Shape: Lorentz, Doppler, Voigt

Each gas line has two associated line-width parameters that describe the line shape at two extremes where the line-broadening behaviour is well understood. One parameter describes behaviour assuming only Lorentz broadening, and one describes behaviour assuming only Doppler broadening. Lorentz broadening tends to be the dominant effect at higher pressures, while Doppler broadening is more dominant at lower pressures (that might occur higher in the atmosphere).

For typical temperatures and pressures, the actual line shape is a combination of the two effects, and a convolution of the two shapes, called the Voigt profile, is offered to Genspect clients as an advanced feature. Additional parameters, along with pressure, partial pressure and temperature parameters control the relative weighting of the convolution.

Try our complementary Freetool to compute the radiative properties of a simple gas path. Register today to customize ATMtool simulations to meet your applications using our premium service.

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