In‐flight degradation correction of SCIAMACHY UV reflectances and Absorbing Aerosol Index

Tilstra, L. G.; Graaf, M. de; Aben, I.; Stammes, P.

doi:10.1029/2011jd016957

Cited by 43 publications

(46 citation statements)

References 33 publications

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“…It has ground pixel size of 60  30 km 2 in standard scan mode. Several studies have been conducted on the degradation of SCIAMACHY instrument and its impact on level 1 and derived level 2 products (e.g., Noël et al, 2007;Bramstedt et al, 2009;Tilstra et al, 2012). An official correction for instrument degradation, called m-factor correction, was available to the users of SCIAMACHY data since 2007 (Bramstedt et al, 2009).…”

Section: Methodsmentioning

confidence: 99%

“…An official correction for instrument degradation, called m-factor correction, was available to the users of SCIAMACHY data since 2007 (Bramstedt et al, 2009). By implementation of these correction factors, the trend/artifact caused by instrument degradation in SCIAMACHY data was successfully removed (Tilstra et al, 2012). SCIAMACHY level-2 data for year 2004-2012 from the Tropospheric Emission Monitoring Internet Service (TEMIS) European Research Project (http://temis.nl/) was used to get a quantitative analysis of SO 2 column densities over Pakistan.…”

Section: Methodsmentioning

confidence: 99%

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Spatio-Temporal Analyses of Atmospheric Sulfur Dioxide Column Densities over Pakistan by Using SCIAMACHY Data

Khartak

Khokhar

Yasmtn

2014

Aerosol Air Qual. Res.

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This paper presents the results of atmospheric Sulfur dioxide (SO 2 ) column densities obtained from satellite observation over Pakistan during the time period of 2004-2012. The level-2 data product of the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) instrument on-board ENVISAT-1 is used. SO 2 column densities are retrieved by applying differential optical absorption spectroscopy (DOAS) technique. The spatio-temporal distribution of SO 2 column densities along with the seasonal variation over main cities and regions of Pakistan are discussed. The Nabro volcano eruption in the year 2011 caused high SO 2 levels over East Africa, the Middle East and South and Southeast Asia. Satellite images exhibited several episodes of volcanic SO 2 column densities transported to Pakistan. The temporal trend in SO 2 column densities was calculated, and the significance of the data set was tested with statistical analysis. An overall increase of about 70% (8.7% per year) in SO 2 column densities over Pakistan during the time period of 2004-2012 has been calculated. This study presents the first spatial and temporal analyses of SO 2 column densities over Pakistan by using satellite observation.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Spatio-Temporal Analyses of Atmospheric Sulfur Dioxide Column Densities over Pakistan by Using SCIAMACHY Data

Khartak

Khokhar

Yasmtn

2014

Aerosol Air Qual. Res.

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“…However, instruments employing scan mirrors often observe their scientific targets under different angles than their (in-flight) calibration sources. As more satellites spent longer times in orbit, it became clear that the transmission loss or degradation is dependent on the scan angle (of the scan mirror) (Krijger et al, 2005b;Tilstra et al, 2012). This has been referred to as the scan-angle-dependent degradation.…”

Section: Introductionmentioning

confidence: 99%

Mirror contamination in space I: mirror modelling

et al. 2014

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Abstract. We present a comprehensive model that can be employed to describe and correct for degradation of (scan) mirrors and diffusers in satellite instruments that suffer from changing optical Ultraviolet to visible (UV-VIS) properties during their operational lifetime. As trend studies become more important, so does the importance of understanding and correcting for this degradation. This is the case not only with respect to the transmission of the optical components, but also with respect to wavelength, polarisation, or scan-angle effects. Our hypothesis is that mirrors in flight suffer from the deposition of a thin absorbing layer of contaminant, which slowly builds up over time. We describe this with the Mueller matrix formalism and Fresnel equations for thin multi-layer contamination films. Special care is taken to avoid the confusion often present in earlier publications concerning the Mueller matrix calculus with out-of-plane reflections. The method can be applied to any UV-VIS satellite instrument. We illustrate and verify our approach to the optical behaviour of the multiple scan mirrors of SCIAMACHY (onboard EN-VISAT).

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“…Before calculating the AAI from the Earth reflectances, the reflectances are first corrected for the effects of instrument degradation. For this preprocessing correction we make use of the method introduced in Tilstra et al (2012a) for the SCIAMACHY instrument that was later applied to the GOME-2 instrument (Tilstra et al, 2012b). This correction for instrument degradation is a function of time, wavelength and scan mirror position, and it is instrument-specific.…”

Section: Aerosol Productsmentioning

confidence: 99%

Overview of the O3M SAF GOME-2 operational atmospheric composition and UV radiation data products and data availability

et al. 2016

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Abstract. The three Global Ozone Monitoring Experiment-2 instruments will provide unique and long data sets for atmospheric research and applications. The complete time period will be 2007-2022, including the period of ozone depletion as well as the beginning of ozone layer recovery. Besides ozone chemistry, the GOME-2 (Global Ozone Monitoring Experiment-2) products are important e.g. for air quality studies, climate modelling, policy monitoring and hazard warnings. The heritage for GOME-2 is in the ERS/GOME and Envisat/SCIAMACHY instruments. The current Level 2 (L2) data cover a wide range of products such as ozone and minor trace gas columns (NO 2 , BrO, HCHO, H 2 O, SO 2 ), vertical ozone profiles in high and low spatial resolution, absorbing aerosol indices, surface Lambertian-equivalent reflectivity database, clear-sky and cloud-corrected UV indices and surface UV fields with different weightings and photolysis rates. The Satellite Application Facility on Ozone and Atmospheric Chemistry Monitoring (O3M SAF) processes and disseminates data 24/7. Data quality is guaranteed by the detailed review processes for the algorithms, validation of the products as well as by a continuous quality monitoring of the products and processing. This paper provides an overview of the O3M SAF project background, current status and future plans for the utilisation of the GOME-2 data. An important focus is the provision of summaries of the GOME-2 products including product principles and validation examples together with sample images. Furthermore, this paper collects references to the detailed product algorithm and validation papers.

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In‐flight degradation correction of SCIAMACHY UV reflectances and Absorbing Aerosol Index

Cited by 43 publications

References 33 publications

Spatio-Temporal Analyses of Atmospheric Sulfur Dioxide Column Densities over Pakistan by Using SCIAMACHY Data

Spatio-Temporal Analyses of Atmospheric Sulfur Dioxide Column Densities over Pakistan by Using SCIAMACHY Data

Mirror contamination in space I: mirror modelling

Overview of the O3M SAF GOME-2 operational atmospheric composition and UV radiation data products and data availability

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