Atmospheric radiative transfer codes

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An atmospheric radiative transfer model, code, or simulator calculates radiative transfer of electromagnetic radiation through a planetary atmosphere.

Contents

Methods

At the core of a radiative transfer model lies the radiative transfer equation that is numerically solved using a solver such as a discrete ordinate method or a Monte Carlo method. The radiative transfer equation is a monochromatic equation to calculate radiance in a single layer of the Earth's atmosphere. To calculate the radiance for a spectral region with a finite width (e.g., to estimate the Earth's energy budget or simulate an instrument response), one has to integrate this over a band of frequencies (or wavelengths). The most exact way to do this is to loop through the frequencies of interest, and for each frequency, calculate the radiance at this frequency. For this, one needs to calculate the contribution of each spectral line for all molecules in the atmospheric layer; this is called a line-by-line calculation. For an instrument response, this is then convolved with the spectral response of the instrument.

A faster but more approximate method is a band transmission. Here, the transmission in a region in a band is characterised by a set of pre-calculated coefficients (depending on temperature and other parameters). In addition, models may consider scattering from molecules or particles, as well as polarisation; however, not all models do so.

Applications

Radiative transfer codes are used in broad range of applications. They are commonly used as forward models for the retrieval of geophysical parameters (such as temperature or humidity). Radiative transfer models are also used to optimize solar photovoltaic systems for renewable energy generation. [1] Another common field of application is in a weather or climate model, where the radiative forcing is calculated for greenhouse gases, aerosols, or clouds. In such applications, radiative transfer codes are often called radiation parameterization. In these applications, the radiative transfer codes are used in forward sense, i.e. on the basis of known properties of the atmosphere, one calculates heating rates, radiative fluxes, and radiances.

There are efforts for intercomparison of radiation codes. One such project was ICRCCM (Intercomparison of Radiation Codes in Climate Models) effort that spanned the late 1980s – early 2000s. The more current (2011) project, Continual Intercomparison of Radiation Codes, emphasises also using observations to define intercomparison cases. [2]

Table of models

Name
Website
References
UV
Visible
Near IR
Thermal IR
mm/sub-mm
Microwave
line-by-line/band
Scattering
Polarised
Geometry
License
Notes
4A/OP Archived 2011-07-21 at the Wayback Machine Scott and Chédin (1981)

[3]

NoNoYesYesNoNoband or line-by-lineYesYesfreeware
6S/6SV1 Kotchenova et al. (1997)

[4]

NoYesYesNoNoNoband?Yesnon-Lambertian surface
ARTS Eriksson et al. (2011)

[5]

Buehler et al. (2018) [6]

NoNoNoYesYesYesline-by-lineYesYesspherical 1D, 2D, 3D GPL
BTRAM Chapman et al. (2009)

[7]

NoYesYesYesYesYesline-by-lineNoNo1D,plane-parallelproprietary commercial
COART Jin et al. (2006)

[8]

YesYesYesYesNoNoYesNoplane-parallelfree
CRM NoYesYesYesNoNobandYesNofreely availablePart of NCAR Community Climate Model
CRTM Johnson et al. (2023)

[9]

v3.0YesYesYesYespassive, activebandYesv3.0, UV/VIS1D, Plane-ParallelPublic DomainFresnel ocean surfaces, Lambertian non-ocean surface
DART radiative transfer model Gastellu-Etchegorry et al. (1996)

[10]

NoYesYesYesNoNobandYes?spherical 1D, 2D, 3Dfree for research with licensenon-Lambertian surface, landscape creation and import
DISORT Stamnes et al. (1988) [11]

Lin et al. (2015) [12]

YesYesYesYesYesradarYesNoplane-parallel or pseudo-spherical (v4.0)free with restrictionsdiscrete ordinate, used by others
Eradiate NoYesYesNoNoNoband or line-by-lineYesNoplane-parallel, spherical LGPL 3D surface simulation
FARMS Xie et al. (2016)

[13]

λ>0.2 µmYesYesNoNoNobandYesNoplane-parallelfreeRapidly simulating downwelling solar radiation at land surface for solar energy and climate research
Fu-Liou Fu and Liou (1993)

[14]

NoYesYes?NoNoYes?plane-parallelusage online, source code availableweb interface online at [15]
FUTBOLIN Martin-Torres (2005)

[16]

λ>0.3 µmYesYesYesλ<1000 µmNoline-by-lineYes?spherical or plane-parallelhandles line-mixing, continuum absorption and NLTE
GENLN2 Edwards (1992)

[17]

???Yes??line-by-line??
KARINE Eymet (2005)

[18]

NoNoYesNoNo??plane-parallelGPL
KCARTA ??YesYes??line-by-lineYes?plane-parallelfreely available AIRS reference model
KOPRA NoNoNoYesNoNo??
LBLRTM Clough et al. (2005)

[19]

YesYesYesYesYesYesline-by-line??
LEEDR Fiorino et al. (2014)

[20]

λ>0.2 µmYesYesYesYesYesband or line-by-lineYes?sphericalUS government softwareextended solar & lunar sources;

single & multiple scattering

LinePak Gordley et al. (1994)

[21]

YesYesYesYesYesYesline-by-lineNoNospherical (Earth and Mars), plane-parallelfreely available with restrictionsweb interface, SpectralCalc
libRadtran Mayer and Kylling (2005)

[22]

YesYesYesYesNoNoband or line-by-lineYesYesplane-parallel or pseudo-spherical GPL
MATISSE Caillault et al. (2007)

[23]

NoYesYesYesNoNobandYes?proprietary freeware
MCARaTS [24] GPL3-D Monte Carlo
MODTRAN Berk et al. (1998)

[25]

<50,000 cm−1 (eq. to λ>0.2 µm)YesYesYesYesYesband or line-by-lineYes?proprietary commercialsolar and lunar source, uses DISORT
MOSART Cornette (2006)

[26]

λ>0.2 µmYesYesYesYesYesbandYesNofreely available
MSCART Wang et al. (2017) [27]

Wang et al. (2019) [28]

YesYesYesNoNoNoYesYes1D, 2D, 3Davailable on request
PICASO link Batalha et al. (2019) [29] Mukherjee et al. (2022) [30] λ>0.3 μmYesYesYesNoNoband or correlated-kYesNoplane-parallel, 1D, 3D GPL Github exoplanet, brown dwarf, climate modeling, phase-dependence
PUMAS YesYesYesYesYesYesLine-by-line and correlated-kYesYesplane-parallel and pseudo-sphericalFree/online tool
RADIS Pannier (2018)

[31]

NoNoYesNoNoNoNo1DGPL
RFM NoNoNoYesNoNoline-by-lineNo?available on request MIPAS reference model based on GENLN2
RRTM/RRTMG Mlawer, et al. (1997)

[32]

<50,000 cm−1 (eq. to λ>0.2 µm)YesYesYesYes >10 cm−1??free of chargeuses DISORT
RTMOM [ dead link ]λ>0.25 µmYesYesλ<15 µmNoNoline-by-lineYes?plane-parallelfreeware
RTTOV Saunders et al. (1999)

[33]

λ>0.4 µmYesYesYesYesYesbandYes?available on request
SASKTRAN [34] Bourassa et al.

(2008) [35]

Zawada et al.

(2015) [36]

YesYesYesNoNoNoline-by-lineYesYesspherical 1D, 2D, 3D, plane-parallelavailable on requestdiscrete and Monte Carlo options
SBDART Ricchiazzi et al. (1998)

[37]

YesYesYes?NoNoYes?plane-paralleluses DISORT
SCIATRAN Rozanov et al. (2005)

, [38]

 Rozanov et al. (2014) 

[39]

YesYesYesNoNoNoband or line-by-lineYesYesplane-parallel or pseudo-spherical or spherical
SHARM Lyapustin (2002)

[40]

NoYesYesNoNoNoYes?
SHDOM Evans (2006)

[41]

??YesYes??Yes?
σ-IASI Amato et al. (2002) [42]

Liuzzi et al. (2017) [43]

NoNoYesYesYesNobandYesNoplane-parallelAvailable on requestSemi-analytical Jacobians.
SMART-G Ramon et al. (2019)

[44]

YesYesYesNoNoNoband or line-by-lineYesYesplane-parallel or sphericalfree for non-commercial purposesMonte-Carlo code parallelized by GPU (CUDA). Atmosphere or/and ocean options
Streamer, Fluxnet [45] Key and Schweiger (1998)

[46]

NoNoλ>0.6 mmλ<15 mmNoNobandYes?plane-parallelFluxnet is fast version of STREAMER using neural nets
XRTM YesYesYesYesYesYesYesYesplane-parallel and pseudo-sphericalGPL
VLIDORT/LIDORT [47] Spurr and Christi (2019)

[48]

YesYesYesYes??line-by-lineYesYes VLIDORT onlyplane-parallelUsed in SMART and VSTAR radiative transfer
NameWebsiteReferencesUVVISNear IRThermal IRMicrowavemm/sub-mmline-by-line/bandScatteringPolarisedGeometryLicenseNotes

Molecular absorption databases

For a line-by-line calculation, one needs characteristics of the spectral lines, such as the line centre, the intensity, the lower-state energy, the line width and the shape.

NameAuthorDescription
HITRAN [49] Rothman et al. (1987, 1992, 1998, 2003, 2005, 2009, 2013, 2017)HITRAN is a compilation of molecular spectroscopic parameters that a variety of computer codes use to predict and simulate the transmission and emission of light in the atmosphere. The original version was created at the Air Force Cambridge Research Laboratories (1960's). The database is maintained and developed at the Harvard-Smithsonian Center for Astrophysics in Cambridge MA, USA.
GEISA [50] Jacquinet-Husson et al. (1999, 2005, 2008)GEISA (Gestion et Etude des Informations Spectroscopiques Atmosphériques: Management and Study of Spectroscopic Information) is a computer-accessible spectroscopic database, designed to facilitate accurate forward radiative transfer calculations using a line-by-line and layer-by-layer approach. It was started in 1974 at Laboratoire de Météorologie Dynamique (LMD/IPSL) in France. GEISA is maintained by the ARA group at LMD (Ecole Polytechnique) for its scientific part and by the ETHER group (CNRS Centre National de la Recherche Scientifique-France) at IPSL (Institut Pierre Simon Laplace) for its technical part. Currently, GEISA is involved in activities related to the assessment of the capabilities of IASI (Infrared Atmospheric Sounding Interferometer on board of the METOP European satellite) through the GEISA/IASI database derived from GEISA.

See also

Related Research Articles

<span class="mw-page-title-main">Greenhouse effect</span> Atmospheric phenomenon causing planetary warming

The greenhouse effect occurs when greenhouse gases in a planet's atmosphere trap some of the heat radiated from the planet's surface, raising its temperature. This process happens because stars emit shortwave radiation that passes through greenhouse gases, but planets emit longwave radiation that is partly absorbed by greenhouse gases. That difference reduces the rate at which a planet can cool off in response to being warmed by its host star. Adding to greenhouse gases further reduces the rate a planet emits radiation to space, raising its average surface temperature.

<span class="mw-page-title-main">Rayleigh scattering</span> Light scattering by small particles

Rayleigh scattering, named after the 19th-century British physicist Lord Rayleigh, is the predominantly elastic scattering of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation. For light frequencies well below the resonance frequency of the scattering medium, the amount of scattering is inversely proportional to the fourth power of the wavelength, e.g., a blue color is scattered much more than a red color as light propagates through air.

<span class="mw-page-title-main">Spectroscopy</span> Study involving matter and electromagnetic radiation

Spectroscopy is the field of study that measures and interprets electromagnetic spectra. In narrower contexts, spectroscopy is the precise study of color as generalized from visible light to all bands of the electromagnetic spectrum.

<span class="mw-page-title-main">General circulation model</span> Type of climate model

A general circulation model (GCM) is a type of climate model. It employs a mathematical model of the general circulation of a planetary atmosphere or ocean. It uses the Navier–Stokes equations on a rotating sphere with thermodynamic terms for various energy sources. These equations are the basis for computer programs used to simulate the Earth's atmosphere or oceans. Atmospheric and oceanic GCMs are key components along with sea ice and land-surface components.

<span class="mw-page-title-main">Absorption spectroscopy</span> Spectroscopic techniques that measure the absorption of radiation

Absorption spectroscopy is spectroscopy that involves techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum. Absorption spectroscopy is performed across the electromagnetic spectrum.

<span class="mw-page-title-main">Emissivity</span> Capacity of an object to radiate electromagnetic energy

The emissivity of the surface of a material is its effectiveness in emitting energy as thermal radiation. Thermal radiation is electromagnetic radiation that most commonly includes both visible radiation (light) and infrared radiation, which is not visible to human eyes. A portion of the thermal radiation from very hot objects is easily visible to the eye.

Radiative transfer is the physical phenomenon of energy transfer in the form of electromagnetic radiation. The propagation of radiation through a medium is affected by absorption, emission, and scattering processes. The equation of radiative transfer describes these interactions mathematically. Equations of radiative transfer have application in a wide variety of subjects including optics, astrophysics, atmospheric science, and remote sensing. Analytic solutions to the radiative transfer equation (RTE) exist for simple cases but for more realistic media, with complex multiple scattering effects, numerical methods are required. The present article is largely focused on the condition of radiative equilibrium.

<span class="mw-page-title-main">Discrete dipole approximation</span>

Discrete dipole approximation (DDA), also known as coupled dipole approximation, is a method for computing scattering of radiation by particles of arbitrary shape and by periodic structures. Given a target of arbitrary geometry, one seeks to calculate its scattering and absorption properties by an approximation of the continuum target by a finite array of small polarizable dipoles. This technique is used in a variety of applications including nanophotonics, radar scattering, aerosol physics and astrophysics.

<span class="mw-page-title-main">HITRAN</span>

HITRAN molecular spectroscopic database is a compilation of spectroscopic parameters used to simulate and analyze the transmission and emission of light in gaseous media, with an emphasis on planetary atmospheres. The knowledge of spectroscopic parameters for transitions between energy levels in molecules is essential for interpreting and modeling the interaction of radiation (light) within different media.

Streamer is a radiative transfer code to calculate radiances (intensities) or irradiances in the atmosphere.

<span class="mw-page-title-main">Electromagnetic absorption by water</span>

The absorption of electromagnetic radiation by water depends on the state of the water.

Atmospheric correction is the process of removing the scattering and absorption effects of the atmosphere on the reflectance values of images taken by satellite or airborne sensors. Atmospheric effects in optical remote sensing are significant and complex, dramatically altering the spectral nature of the radiation reaching the remote sensor. The atmosphere both absorbs and scatters various wavelengths of the visible spectrum which must pass through the atmosphere twice, once from the sun to the object and then again as it travels back up the image sensor. These distortions are corrected using various approaches and techniques, as described below.

In models of radiative transfer, the two-stream approximation is a discrete ordinate approximation in which radiation propagating along only two discrete directions is considered. In other words, the two-stream approximation assumes the intensity is constant with angle in the upward hemisphere, with a different constant value in the downward hemisphere. It was first used by Arthur Schuster in 1905. The two ordinates are chosen such that the model captures the essence of radiative transport in light scattering atmospheres. A practical benefit of the approach is that it reduces the computational cost of integrating the radiative transfer equation. The two-stream approximation is commonly used in parameterizations of radiative transport in global circulation models and in weather forecasting models, such as the WRF. There are a large number of applications of the two-stream approximation, including variants such as the Kubelka-Munk approximation. It is the simplest approximation that can be used to explain common observations inexplicable by single-scattering arguments, such as the brightness and color of the clear sky, the brightness of clouds, the whiteness of a glass of milk, and the darkening of sand upon wetting. The two-stream approximation comes in many variants, such as the Quadrature, and Hemispheric constant models. Mathematical descriptions of the two-stream approximation are given in several books. The two-stream approximation is separate from the Eddington approximation, which instead assumes that the intensity is linear in the cosine of the incidence angle, with no discontinuity at the horizon.

Codes for electromagnetic scattering by spheres - this article list codes for electromagnetic scattering by a homogeneous sphere, layered sphere, and cluster of spheres.

<span class="mw-page-title-main">Morse/Long-range potential</span> Model of the potential energy of a diatomic molecule

The Morse/Long-range potential (MLR potential) is an interatomic interaction model for the potential energy of a diatomic molecule. Due to the simplicity of the regular Morse potential (it only has three adjustable parameters), it is very limited in its applicability in modern spectroscopy. The MLR potential is a modern version of the Morse potential which has the correct theoretical long-range form of the potential naturally built into it. It has been an important tool for spectroscopists to represent experimental data, verify measurements, and make predictions. It is useful for its extrapolation capability when data for certain regions of the potential are missing, its ability to predict energies with accuracy often better than the most sophisticated ab initio techniques, and its ability to determine precise empirical values for physical parameters such as the dissociation energy, equilibrium bond length, and long-range constants. Cases of particular note include:

  1. the c-state of dilithium (Li2): where the MLR potential was successfully able to bridge a gap of more than 5000 cm−1 in experimental data. Two years later it was found that the MLR potential was able to successfully predict the energies in the middle of this gap, correctly within about 1 cm−1. The accuracy of these predictions was much better than the most sophisticated ab initio techniques at the time.
  2. the A-state of Li2: where Le Roy et al. constructed an MLR potential which determined the C3 value for atomic lithium to a higher-precision than any previously measured atomic oscillator strength, by an order of magnitude. This lithium oscillator strength is related to the radiative lifetime of atomic lithium and is used as a benchmark for atomic clocks and measurements of fundamental constants.
  3. the a-state of KLi: where the MLR was used to build an analytic global potential successfully despite there only being a small amount of levels observed near the top of the potential.

COART - COART is established on the Coupled DIScrete Ordinate Radiative Transfer code, developed from DISORT. It is designed to simulate radiance and irradiance (flux) at any levels in the atmosphere and ocean consistently.

<span class="mw-page-title-main">ARTS (radiative transfer code)</span>

ARTS is a widely used atmospheric radiative transfer simulator for infrared, microwave, and sub-millimeter wavelengths. While the model is developed by a community, core development is done by the University of Hamburg and Chalmers University, with previous participation from Luleå University of Technology and University of Bremen.

<span class="mw-page-title-main">Dirubidium</span> Chemical compound

Dirubidium is a molecular substance containing two atoms of rubidium found in rubidium vapour. Dirubidium has two active valence electrons. It is studied both in theory and with experiment. The rubidium trimer has also been observed.

In the study of heat transfer, Schwarzschild's equation is used to calculate radiative transfer through a medium in local thermodynamic equilibrium that both absorbs and emits radiation.

<span class="mw-page-title-main">Near-field radiative heat transfer</span>

Near-field radiative heat transfer (NFRHT) is a branch of radiative heat transfer which deals with situations for which the objects and/or distances separating objects are comparable or smaller in scale or to the dominant wavelength of thermal radiation exchanging thermal energy. In this regime, the assumptions of geometrical optics inherent to classical radiative heat transfer are not valid and the effects of diffraction, interference, and tunneling of electromagentic waves can dominate the net heat transfer. These "near-field effects" can result in heat transfer rates exceeding the blackbody limit of classical radiative heat transfer.

References

Footnotes
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  2. Continual Intercomparison of Radiation Codes
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