Sciatran - a new radiative transfer model for geophysical applications in the 240–2400 NM spectral region: the pseudo-spherical version

Розанов, В. В.; Buchwitz, Michael; Eichmann, K. ­U.; Beek, R. de; Burrows, J. P.

doi:10.1016/s0273-1177(02)00095-9

Cited by 115 publications

(65 citation statements)

References 12 publications

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“…This is made, using the radiative transfer code from Nakajima and Tanaka [1988], for the solar illumination and satellite observation geometry within the scene. Equal values have been obtained using other RTM, like GOME-TRAN or SCIATRAN [Rozanov et al, 1997[Rozanov et al, , 2002. Aerosol reflectance is strongly dependent on illumination and viewing geometry.…”

Section: Setup Of Lookup Tables (Lut)mentioning

confidence: 98%

Retrieval of aerosol optical thickness over land surfaces from top‐of‐atmosphere radiance

2003

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[1] Aerosol remote sensing requires techniques enabling the determination of aerosol optical thickness (AOT) over land surfaces, because the most important sources (continental aerosols, anthropogenic aerosols, biomass burning, desert dust, volcano eruptions and others) are on continents. Here a retrieval method for the AOT over land surfaces from top-of-atmosphere (TOA) radiance using nadir looking instruments of the ocean color type (like Ocean Color and Temperature Sensor (OCTS), Sea viewing Wide Field Sensor (SeaWiFS), Moderate resolution Imaging Sensor (MODIS) or Medium Resolution Imaging Sensor (MERIS)) is presented. It is scheduled as an off-line procedure for the ENVISAT radiometers SCIAMACHY and MERIS. The method is based on lookup tables (LUT) between the AOT and the aerosol reflectance for wavelength <0.67 mm. The aerosol reflectance is obtained from TOA reflectance accounting for Rayleigh path reflectance and the apparent spectral surface reflectance. Over land the surface reflectance is estimated by a mixing model of bare soil and green vegetation spectra, tuned by the normalized differential vegetation index (NDVI) of the satellite scene. The method has been tested and validated with SeaWiFS data and with aerosol properties of the closure experiment LACE-98 (Lindenberg Aerosol Charactrization Experiment). For short wave channels (0.412-510 mm) an agreement between the retrieved and ground-based data of 20% is achieved. Thus the method enables the investigation of AOT over land, yielding the regional turbidity situation as well as the identification of aerosol sources like large cities, large fire plumes, haze, small scale dynamical events and also thin cirrus clouds.

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Section: Setup Of Lookup Tables (Lut)mentioning

confidence: 98%

Retrieval of aerosol optical thickness over land surfaces from top‐of‐atmosphere radiance

2003

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“…The HAIDI consists of three DOAS instruments which point in different directions and are used either in whisk-broom or push-broom mode (Schowengerdt, 2007). Observations yield spatial trace gas distributions at ground resolutions below 100 m depending on flight altitude, as well as information on the vertical distribution.…”

Section: A Schönhardt Et Al: Imaging Doas Instrument For Trace Gas mentioning

confidence: 99%

“…The combination of the imaging spectrometer and the 2-D detector enables the push-broom imaging technique, where the field of view across track is observed simultaneously. In contrast, whisk-broom imagers scan over the swath measuring in different viewing directions in a rapid sequence (Schowengerdt, 2007). A further feature of AirMAP is the specific choice of the CCD detector, which is a frame-transfer camera.…”

Section: A Ircraft Skinmentioning

confidence: 99%

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A wide field-of-view imaging DOAS instrument for two-dimensional trace gas mapping from aircraft

Schönhardt¹,

Altube

Gerilowski

et al. 2015

Atmos. Meas. Tech.

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Abstract. The Airborne imaging differential optical absorption spectroscopy (DOAS) instrument for Measurements of Atmospheric Pollution (AirMAP) has been developed for the purpose of trace gas measurements and pollution mapping. The instrument has been characterized and successfully operated from aircraft. Nitrogen dioxide (NO 2 ) columns were retrieved from the AirMAP observations. A major benefit of the push-broom imaging instrument is the spatially continuous, gap-free measurement sequence independent of flight altitude, a valuable characteristic for mapping purposes. This is made possible by the use of a charge coupled device (CCD) frame-transfer detector. A broad field of view across track of around 48 • is achieved with wide-angle entrance optics. This leads to a swath width of about the same size as the flight altitude. The use of fibre coupled light intake optics with sorted light fibres allows flexible instrument positioning within the aircraft and retains the very good imaging capabilities. The measurements yield ground spatial resolutions below 100 m depending on flight altitude. The number of viewing directions is chosen from a maximum of 35 individual viewing directions (lines of sight, LOS) represented by 35 individual fibres. The selection is adapted to each situation by averaging according to signal-to-noise or spatial resolution requirements. Observations at 30 m spatial resolution are obtained when flying at 1000 m altitude and making use of all 35 viewing directions. This makes the instrument a suitable tool for mapping trace gas point sources and small-scale variability. The position and aircraft attitude are taken into account for accurate spatial mapping using the Attitude and Heading Reference System of the aircraft. A first demonstration mission using AirMAP was undertaken in June 2011. AirMAP was operated on the AWI Polar-5 aircraft in the framework of the AIRMETH-2011 campaign. During a flight above a medium-sized coal-fired power plant in north-west Germany, AirMAP clearly detected the emission plume downwind from the exhaust stack, with NO 2 vertical columns around 2 × 10 16 molecules cm −2 in the plume centre. NO x emissions estimated from the AirMAP observations are consistent with reports in the European Pollutant Release and Transfer Register. Strong spatial gradients and variability in NO 2 amounts across and along flight direction are observed, and small-scale enhancements of NO 2 above a motorway are detected.

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“…(4) total atmospheric transmissions and hemispheric reflectance are used, containing the effect of multiple scattering. The total transmittance and hemispheric reflectance are determined using the SCIATRAN radiative transfer model, Rozanov et al (2001) and the results are applied in a parameterized form for a fast processing within the retrieval procedure. Here we separate the total atmospheric transmission into their fractions for Rayleigh and aerosol scattering:…”

Section: Appendix a Total Transmission And Hemispheric Reflectancementioning

confidence: 99%

Validation of SCIAMACHY top-of-atmosphere reflectance for aerosol remote sensing using MERIS L1 data

et al. 2007

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Abstract. Aerosol remote sensing is very much dependent on the accurate knowledge of the top-of-atmosphere (TOA) reflectance measured by a particular instrument. The status of the calibration of such an instrument is reflected in the quality of the aerosol retrieval. Current data of the SCIA-MACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY) instrument (operated with the data processor version 5 and earlier) give too small values of the TOA reflectance, compared e.g. to data from MERIS (Medium Resolution Imaging Spectrometer), both operating on ENVISAT (ENVIronmental SATellite). This effect causes retrievals of wrong aerosol optical thickness and disables the processing of aerosol parameters.From an inter-comparison of MERIS and SCIAMACHY TOA reflectance, for collocated scenes correction factors are derived to improve the insufficient SCIAMACHY L1 data calibration for data obtained with the processor 5 for the purpose of aerosol remote sensing. The corrected reflectance has been used for tests of remote sensing of the aerosol optical thickness by the BAER (Bremen AErosol Retrieval) approach using SCIAMACHY data.

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Sciatran - a new radiative transfer model for geophysical applications in the 240–2400 NM spectral region: the pseudo-spherical version

Cited by 115 publications

References 12 publications

Retrieval of aerosol optical thickness over land surfaces from top‐of‐atmosphere radiance

Retrieval of aerosol optical thickness over land surfaces from top‐of‐atmosphere radiance

A wide field-of-view imaging DOAS instrument for two-dimensional trace gas mapping from aircraft

Validation of SCIAMACHY top-of-atmosphere reflectance for aerosol remote sensing using MERIS L1 data

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