MODTRAN4 radiative transfer modeling for atmospheric correction

Berk, Alexander; Anderson, Gail P.; Bernstein, Lawrence S.; Acharya, Prabhat K.; Dothe, H.; Matthew, Michael W.; Adler‐Golden, Steven M.; Chetwynd, James H.; Richtsmeier, Steven C.; Pukall, Brian; Allred, Clark L.; Jeong, Laila S.; Hoke, Michael L.

doi:10.1117/12.366388

Cited by 316 publications

(169 citation statements)

References 13 publications

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“…CO 2 , CH 4 , N 2 O, O 3 ) that are assumed invariant. The foreground and background radiation can be calculated from the MODTRAN-4 radiative transfer model (Berk et al, 1999) using a nearby radiosonde profile for water vapour (ρ 1 ) and temperature and assuming climatological values for the well-mixed gases. However, an alternate procedure which makes better use of the camera measurements has been adopted.…”

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confidence: 99%

Retrieval of sulfur dioxide from a ground-based thermal infrared imaging camera

Prata

Bernardo

2014

Atmos. Meas. Tech.

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Abstract. Recent advances in uncooled detector technology now offer the possibility of using relatively inexpensive thermal (7 to 14 µm) imaging devices as tools for studying and quantifying the behaviour of hazardous gases and particulates in atmospheric plumes. An experimental fast-sampling (60 Hz) ground-based uncooled thermal imager (Cyclops), operating with four spectral channels at central wavelengths of 8.6, 10, 11 and 12 µm and one broadband channel (7-14 µm) has been tested at several volcanoes and at an industrial site, where SO 2 was a major constituent of the plumes. This paper presents new algorithms, which include atmospheric corrections to the data and better calibrations to show that SO 2 slant column density can be reliably detected and quantified. Our results indicate that it is relatively easy to identify and discriminate SO 2 in plumes, but more challenging to quantify the column densities. A full description of the retrieval algorithms, illustrative results and a detailed error analysis are provided. The noise-equivalent temperature difference (NE T ) of the spectral channels, a fundamental measure of the quality of the measurements, lies between 0.4 and 0.8 K, resulting in slant column density errors of 20 %. Frame averaging and improved NE T 's can reduce this error to less than 10 %, making a stand-off, day or night operation of an instrument of this type very practical for both monitoring industrial SO 2 emissions and for SO 2 column densities and emission measurements at active volcanoes. The imaging camera system may also be used to study thermal radiation from meteorological clouds and the atmosphere.

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confidence: 99%

Retrieval of sulfur dioxide from a ground-based thermal infrared imaging camera

Prata

Bernardo

2014

Atmos. Meas. Tech.

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“…[14] MODTRAN is a moderate spectral resolution model for the calculation of transmittances, radiances, and irradiances [Berk et al, 1999]. MODTRAN has been designed to reproduce the results of line-by-line models within the constraints of increased computational efficiency.…”

Section: Radiative Transfer Modelsmentioning

confidence: 99%

Downward longwave irradiance uncertainty under arctic atmospheres: Measurements and modeling

et al. 2003

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[1] Measurement and modeling of downward longwave irradiance are a special challenge in arctic winter due to its low water vapor content and the extreme meteorological conditions. There are questions about the representativeness of the instrument calibration, the consistency and uncertainty of measurements and models in these environments. The Second International Pyrgeometer and Absolute Sky-scanning Radiometer Comparison (IPASRC-II), which was conducted at Atmospheric Radiation Measurement (ARM) program's North Slope of Alaska (NSA) site in Barrow provided a unique opportunity to compare high accuracy downward longwave irradiance measurements and radiative transfer model computations during arctic winter. Participants from 11 international institutions deployed 14 pyrgeometers, which were field-calibrated against the Absolute Sky-scanning Radiometer (ASR). Continuous measurements over a 10-day period in early

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“…Figure 2 shows the transmittance from Rayleigh scattering, aerosols and IWV, as calculated by the MODerate resolution atmospheric TRANsmisson radiative transfer model (MODTRAN RTM) (Berk et al, 1987(Berk et al, , 1999. Aerosols direct effect on irradiance is measured through AOD, which is the integrated extinction coefficient on vertical column due to aerosols.…”

Section: Methodsmentioning

confidence: 99%

Water vapour retrieval using the Precision Solar Spectroradiometer

et al. 2018

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Abstract. The Precision Solar Spectroradiometer (PSR) is a new spectroradiometer developed at PhysikalischMeteorologisches Observatorium Davos -World Radiation Center (PMOD-WRC), Davos, measuring direct solar irradiance at the surface, in the 300-1020 nm spectral range and at high temporal resolution. The purpose of this work is to investigate the instrument's potential to retrieve integrated water vapour (IWV) using its spectral measurements. Two different approaches were developed in order to retrieve IWV: the first one uses single-channel and wavelength measurements, following a theoretical water vapour high absorption wavelength, and the second one uses direct sun irradiance integrated at a certain spectral region. IWV results have been validated using a 2-year data set, consisting of an AERONET sun-photometer Cimel CE318, a Global Positioning System (GPS), a microwave radiometer profiler (MWP) and radiosonde retrievals recorded at Meteorological Observatorium Lindenberg, Germany. For the monochromatic approach, better agreement with retrievals from other methods and instruments was achieved using the 946 nm channel, while for the spectral approach the 934-948 nm window was used. Compared to other instruments' retrievals, the monochromatic approach leads to mean relative differences up to 3.3 % with the coefficient of determination (R 2 ) being in the region of 0.87-0.95, while for the spectral approach mean relative differences up to 0.7 % were recorded with R 2 in the region of 0.96-0.98. Uncertainties related to IWV retrieval methods were investigated and found to be less than 0.28 cm for both methods. Absolute IWV deviations of differences between PSR and other instruments were determined the range of 0.08-0.30 cm and only in extreme cases would reach up to 15 %.

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MODTRAN4 radiative transfer modeling for atmospheric correction

Cited by 316 publications

References 13 publications

Retrieval of sulfur dioxide from a ground-based thermal infrared imaging camera

Retrieval of sulfur dioxide from a ground-based thermal infrared imaging camera

Downward longwave irradiance uncertainty under arctic atmospheres: Measurements and modeling

Water vapour retrieval using the Precision Solar Spectroradiometer

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