A successive order of scattering code for solving the vector equation of transfer in the earth's atmosphere with aerosols

Lenoble, J.; Herman, M.; Deuzé, J. L.; Lafrance, Bruno; Santer, R.; Tanré, D.

doi:10.1016/j.jqsrt.2007.03.010

Cited by 195 publications

(128 citation statements)

References 34 publications

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“…Note that SCIATRAN was not used in the creation of the LOA-2 method look-up-tables. This indirectly confirms that both SCIATRAN and also the successive scattering method (Lenoble et al, 2007) used in the creation of LUTs for the LOA-2 retrieval produce similar results. The phase functions for other models are given in Fig.…”

Section: Resultssupporting

confidence: 71%

“…Then the aerosol parameters are adjusted to provide the best agreement between the measurements and the LUT values. The forward model uses the successive orders of scattering method to solve the radiative transfer within the atmosphere (Lenoble et al, 2007) considering realistic surfaces as boundary conditions (Cox and Munk, 1954;Nadal and Bréon, 1999). The combination of spectraldirectional and polarized signatures provides a very strong constraint to invert the aerosol load and characteristics.…”

Section: Loa-1 Algorithmmentioning

confidence: 99%

“…Accounting for multiple scattering effects in the atmosphere is performed using successive orders of scattering radiative transfer code (Lenoble et al, 2007) in a similar way as is implemented in the LOA-1 algorithm, with the difference that 922 A. A.…”

Section: Accounting For Multiple Scattering Effectsmentioning

confidence: 99%

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The inter-comparison of major satellite aerosol retrieval algorithms using simulated intensity and polarization characteristics of reflected light

et al. 2010

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Abstract. Remote sensing of aerosol from space is a challenging and typically underdetermined retrieval task, requiring many assumptions to be made with respect to the aerosol and surface models. Therefore, the quality of a priori information plays a central role in any retrieval process (apart from the cloud screening procedure and the forward radiative transfer model, which to be most accurate should include the treatment of light polarization and molecular-aerosol coupling). In this paper the performance of various algorithms with respect to the of spectral aerosol optical thickness determination from optical spaceborne measurements is studied. The algorithms are based on various types of measurements (spectral, angular, polarization, or some combination of these). It is confirmed that multiangular spectropolarimetric measurements provide more powerful constraints compared to spectral intensity measurements alone, particularly those acquired at a single view angle and which rely on a priori assumptions regarding the particle phase function in the retrieval process.

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Section: Resultssupporting

confidence: 71%

Section: Loa-1 Algorithmmentioning

confidence: 99%

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The inter-comparison of major satellite aerosol retrieval algorithms using simulated intensity and polarization characteristics of reflected light

et al. 2010

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“…Because the a priori information for Z a varies from one case to another, we mention it in the paper as necessary. The polarized and total radiances are computed using the successive order of scattering (SOS) code (Lenoble et al, 2007). The code considers the scattering by molecules, the reflection of the Sun on the ocean (i.e., the glitter) and the ocean surface reflectance.…”

Section: Research Algorithmmentioning

confidence: 99%

Retrieval of the Eyjafjallajökull volcanic aerosol optical and microphysical properties from POLDER/PARASOL measurements

Waquet

Peers²,

Goloub³

et al. 2014

Atmos. Chem. Phys.

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Abstract. Total and polarized radiances provided by the Polarization and Directionality of Earth Reflectances (POLDER) satellite sensor are used to retrieve the microphysical and optical properties of the volcanic plume observed during the Eyjafjallajökull volcano eruption in 2010, over cloud-free and cloudy ocean scenes. We selected two plume conditions, fresh aerosols near the sources (three cases) and a downwind volcanic plume observed over the North Sea 30 h after its injection into the atmosphere (aged aerosols). In the near-source conditions, the aerosol properties depend on the distance to the plume. Within the near-source plume, aerosols are mainly non-spherical and in the coarse mode with an effective radius equal to 1.75 (±0.25) µm and an Ångström exponent (AE) close to 0.0. Far from the plume, in addition to the coarse mode, there are particles retrieved in the accumulation mode, suggesting a mixture of sulfate aerosols and volcanic dust, resulting in an AE around 0.8. The properties of the aerosols also depend on whether the plume is fresh or aged. For the downwind (aged) plume, if non-spherical coarse particles as well as some fine mode particles are retrieved, the AE is higher, around ∼ 0.4. In addition, rather low values for the real part of the refractive index (RR) were retrieved for the fresh plume (1.38 < RR < 1.48). Single scattering albedo (SSA) values ranging between 0.92 and 0.98 were retrieved over some parts of the near-source plume; despite the low accuracy of our retrievals, the derived SSA values suggest that the ash particles are rather absorbing. To consider the particle shape, a combination of spheroid models was used. Although the employed model enabled accurate modeling of the POLDER signal in the case of non-spherical ash, our approach failed to model the signal over the optically thickest parts of the near-source plume. The most probable reason for this is the presence of ice crystals within the plume. For the aerosol above clouds (AAC) scenes, polarized measurements allowed the retrieval of the optical thickness (OT) and the AE of optically thin volcanic ash. We found that all the cloud parameters retrieved by passive sensors were biased due to the presence of the elevated volcanic plumes. Finally, thermal infrared measurements were used to identify the type of multilayer scene (cirrus clouds or volcanic dust above liquid clouds) and the retrieval method also provided the OT of thin cirrus layers above the clouds near Iceland.

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“…The solar spectral irradiance F λ is calculated by the SOS radiative transfer code [10] for the same conditions of ozone amount (OMI data, NASA) and SZA as the GUV-541 voltage measurements in equation (1) (other input atmospheric parameters in the SOS code were taken as typical atmospheric conditions). Since the wavelength cut of the vitamin D action spectrum is 330nm [6], only the MBFR channels centered in 305, 313 and 320nm will be involved in the linear combination (M=3).…”

Section: Methodsmentioning

confidence: 99%

Vitamin D synthesis measured with a multiband filter radiometer in Río Gallegos, Argentina

Orte¹,

Wolfram²,

Salvador³

et al. 2013

AIP Conference Proceedings

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Abstract. Vitamin D plays an important role in human health. Vitamin D production from the sun is affected by UVB solar radiation. This paper presents a simple method for retrieving vitamin D-weighted UV by using a multiband filter radiometer GUV-541 installed at the Atmospheric Observatory of Southern Patagonia (OAPA) (51 º 33' S, 69 º 19' W), Río Gallegos. The methodology used combines irradiance measurements from a multiband filter radiometer with spectral irradiance modeled by the SOS radiative transfer code (developed by Lille University of Science and Technology (USTL)). The spectrum modeled is weighted with vitamin D action spectra published by the International Commission on Illumination (CIE), which describes the relative effectiveness of different wavelengths in the generation of this particular biological response. This method is validated using the vitamin D-weighted UV derived from a Brewer MKIII spectrophotometer (SN 124) belonging to the National Institute for Spatial Research (INPE), Brazil, which is able to measure solar spectra between 290 and 325nm. The method presents a good correlation between the two independent instruments. This procedure increases the instrumental capabilities of the multiband fi lter radiometer. Moreover, it evaluates the annual variation of vitamin D-weighted UV doses from exposure to ultraviolet radiation. These values are likely to be lower than suitable levels of vitamin D during winter and part of spring and autumn at these latitudes.

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A successive order of scattering code for solving the vector equation of transfer in the earth's atmosphere with aerosols

Cited by 195 publications

References 34 publications

The inter-comparison of major satellite aerosol retrieval algorithms using simulated intensity and polarization characteristics of reflected light

The inter-comparison of major satellite aerosol retrieval algorithms using simulated intensity and polarization characteristics of reflected light

Retrieval of the Eyjafjallajökull volcanic aerosol optical and microphysical properties from POLDER/PARASOL measurements

Vitamin D synthesis measured with a multiband filter radiometer in Río Gallegos, Argentina

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