Efficient radiative transfer simulations for a broadband infrared radiometer—Combining a weighted mean of representative frequencies approach with frequency selection by simulated annealing

Buehler, Stefan A.; John, Viju O.; Kottayil, Ajil; Milz, M.; Eriksson, Patrick

doi:10.1016/j.jqsrt.2009.10.018

Cited by 31 publications

(30 citation statements)

References 36 publications

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“…In reptran integrals over spectral intervals, e.g. integrated over a narrow spectral band or an instrument channel response function, are parameterized as weighted means over representative wavelengths similar to the method described by Buehler et al (2010). The selection of an optimum set of representative wavelengths is based on accurate line-by-line simulations for top-of-atmosphere radiances of a highly variable set of atmospheric states.…”

Section: Molecular Absorption Parameterizationsmentioning

confidence: 99%

The libRadtran software package for radiative transfer calculations (version 2.0.1)

Buras-Schnell²,

et al. 2016

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Abstract. libRadtran is a widely used software package for radiative transfer calculations. It allows one to compute (polarized) radiances, irradiance, and actinic fluxes in the solar and thermal spectral regions. libRadtran has been used for various applications, including remote sensing of clouds, aerosols and trace gases in the Earth's atmosphere, climate studies, e.g., for the calculation of radiative forcing due to different atmospheric components, for UV forecasting, the calculation of photolysis frequencies, and for remote sensing of other planets in our solar system. The package has been described in Mayer and Kylling (2005). Since then several new features have been included, for example polarization, Raman scattering, a new molecular gas absorption parameterization, and several new parameterizations of cloud and aerosol optical properties. Furthermore, a graphical user interface is now available, which greatly simplifies the usage of the model, especially for new users. This paper gives an overview of libRadtran version 2.0.1 with a focus on new features. Applications including these new features are provided as examples of use. A complete description of libRadtran and all its input options is given in the user manual included in the libRadtran software package, which is freely available at http://www.libradtran.org.

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Section: Molecular Absorption Parameterizationsmentioning

confidence: 99%

The libRadtran software package for radiative transfer calculations (version 2.0.1)

Buras-Schnell²,

et al. 2016

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“…ARTS was originally developed for applications in the microwave range but is also suitable for applications in the mid-and far-infrared range [see e.g. 32,33]. In this study we used the stable version 2.2 [18].…”

Section: Arts -Atmospheric Radiative Transfer Simulatormentioning

confidence: 99%

Intercomparison of three microwave/infrared high resolution line-by-line radiative transfer codes

Schreier

García

Milz

et al. 2018

Journal of Quantitative Spectroscopy and Radiative Transfer

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An intercomparison of three line-by-line (lbl) codes developed independently for atmospheric radiative transfer and remote sensing -ARTS, GARLIC, and KOPRA -has been performed for a thermal infrared nadir sounding application assuming a HIRS-like (High resolution Infrared Radiation Sounder) setup. Radiances for the 19 HIRS infrared channels and a set of 42 atmospheric profiles from the "Garand dataset" have been computed.The mutual differences of the equivalent brightness temperatures are presented and possible causes of disagreement are discussed. In particular, the impact of path integration schemes and atmospheric layer discretization is assessed. When the continuum absorption contribution is ignored because of the different implementations, residuals are generally in the sub-Kelvin range and smaller than 0.1 K for some window channels (and all atmospheric models and lbl codes). None of the three codes turned out to be perfect for all channels and atmospheres. Remaining discrepancies are attributed to different lbl optimization techniques. Lbl codes seem to have reached a maturity in the implementation of radiative transfer that the choice of the underlying physical models (line shape models, continua etc) becomes increasingly relevant.

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“…To include the influence CO 2 , four sets of simulations are produced using CO 2 concentrations of 330, 350, 370, and 390 ppm. The influence of other greenhouse gases such as NO 2 or CH 4 is neglected, but it is only expected to have a minor effect (Buehler et al 2010). We do not study the influence of sea ice or land emissivity as this study is mainly focused on tropical oceans.…”

Section: Olr Retrievals Using Hirs a Multivariate Regression Of Cleamentioning

confidence: 99%

Satellite-Based Reconstruction of the Tropical Oceanic Clear-Sky Outgoing Longwave Radiation and Comparison with Climate Models

et al. 2014

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The changes of the outgoing longwave radiation (OLR) in clear-sky conditions have been calculated using High Resolution Infrared Radiation Sounder (HIRS) observations from 1979 to 2004. After applying corrections for satellite orbital drift and intercalibration of the HIRS/2 data from the NOAA satellites, the OLR is calculated from a multivariate regression over the tropical ocean region. The clear-sky OLR retrievals compare well with the observed top-of-atmosphere radiation measurements, although the precision and stability uncertainties are larger. While the tropical ocean surface temperature has risen by roughly 0.2 K from 1982 to 2004, the reconstructed OLR remains stable over the ocean. Consequently, there is an increase in the clear-sky greenhouse effect (GHE) of 0.80 W m 22 decade 21 . This trend is shown to be larger than the uncertainty in the stability of the HIRS retrievals.The observations are compared with two phase 3 of the Coupled Model Intercomparison Project model ensembles: one ensemble includes both natural and anthropogenic forcings [the twentieth-century (20C) ensemble] and the other ensemble only contains natural climate variability (the control ensemble). The OLR trend in the 20C simulations tends to be more negative than observed, although a majority is found to be within the observational uncertainty. Conversely, the response of the clear-sky OLR to SST is shown to be very similar in observations and models. Therefore, the trend differences between the 20C simulations and observations are likely because of internal climate variability or uncertainties in the external forcings. The observed increase in GHE is shown to be inconsistent with the control ensemble, indicating that anthropogenic forcings are required to reproduce the observed changes in GHE.

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Efficient radiative transfer simulations for a broadband infrared radiometer—Combining a weighted mean of representative frequencies approach with frequency selection by simulated annealing

Cited by 31 publications

References 36 publications

The libRadtran software package for radiative transfer calculations (version 2.0.1)

The libRadtran software package for radiative transfer calculations (version 2.0.1)

Intercomparison of three microwave/infrared high resolution line-by-line radiative transfer codes

Satellite-Based Reconstruction of the Tropical Oceanic Clear-Sky Outgoing Longwave Radiation and Comparison with Climate Models

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