kCARTA : A fast pseudo line-by-line radiative transfer algorithm with analytic Jacobians, fluxes, Non-Local Thermodynamic Equilibrium and scattering for the infrared

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dc.contributor.authorMachado, Sergio DeSouza
dc.contributor.authorStrow, L. Larrabee
dc.contributor.authorMotteler, Howard
dc.contributor.authorHannon, Scott
dc.date.accessioned2019-10-09T15:37:20Z
dc.date.available2019-10-09T15:37:20Z
dc.date.issued2019-08-09
dc.description.abstractA fast pseudo-monochromatic radiative transfer package using a Singular Value Decomposition (SVD) compressed atmospheric optical depth database has been developed, primarily for use with hyperspectral sounding instruments. The package has been tested extensively for clear sky radiative transfer cases, using field campaign data and satellite instrument data. The current database uses HITRAN 2016 line parameters and is primed for use in the spectral region spanning 605 cm−1 to 2830 cm−1(with a point spacing of 0.0025 cm−1), but can easily be extended to other regions. The clear sky radiative transfer model computes the background thermal radiation quickly and accurately using a layer-varying diffusivity angle at each spectral point; it takes less than 20 seconds (on a 2.8 GHz core using 4 threads) to complete a radiance calculation spanning the infrared. The code can also compute Non Local Thermodynamic Equilibrium effects for the 4 µm CO2 region, as well as analytic temperature, gas and surface jacobians. The package also includes flux and heating rate calculations, and an interface to a scattering model.en_US
dc.description.sponsorshipThis work was supported in part by NASA grant number NNG04GG03G-2. Dave Tobin of UW-Madison helped with UMBCLBL CO2 line-mixing code and modifying the water continuum coefficients. Dave Edwards of NCAR provided the GENLN2 line-by-line code to compare kCARTA against. Both Dave Edwards and Manuel Lopez-Puertas of the Instituto de Astrofisica de Andalucia (Spain) contributed to the NLTE portions of the code. Optical depth and flux comparisons against LBLRTM were facilitated by Eli Mlawer (Atmospheric and Environmental Research, Lexington MA). The impact of spectroscopic uncertainty to BTs at the TOA were carried out partly for the ITOVS Radiative Transfer Working Group, of which Marco Matricardi (ECMWF) is the leader : Iouli Gordon (Harvard-Smithsonian) suggested how to tweak the uncertainties when the indices were 0,1,2, as did Brian Drouin (JPL) for ozone line strengths.en_US
dc.format.extent27 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2uo41-uiyl
dc.identifier.citationDeSouza-Machado, S., Strow, L. L., Motteler, H., and Hannon, S.: kCARTA: A fast pseudo line-by-line radiative transfer algorithmwith analytic Jacobians, fluxes, Non-Local ThermodynamicEquilibrium and scattering for the infrared, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2019-282, in review, 2019.en_US
dc.identifier.urihttps://doi.org/10.5194/amt-2019-282
dc.identifier.urihttp://hdl.handle.net/11603/15006
dc.language.isoen_USen_US
dc.publisherEGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Physics Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution 4.0 International (CC BY 4.0)*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.subjectpseudo-monochromatic radiative transfer packageen_US
dc.subjectSingular Value Decompositionen_US
dc.subjecthyperspectralen_US
dc.subjectlayer-varying diffusivity angleen_US
dc.subjectNon Local Thermodynamic Equilibrium effectsen_US
dc.subjectsurface jacobiansen_US
dc.titlekCARTA : A fast pseudo line-by-line radiative transfer algorithm with analytic Jacobians, fluxes, Non-Local Thermodynamic Equilibrium and scattering for the infrareden_US
dc.typeTexten_US

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