On the Retrieval of Volcanic Sulfur Dioxide Emissions from GOME Backscatter Measurements

Thomas, Werner; Erbertseder, Thilo; Ruppert, Thomas; Roozendaël, Michel Van; Verdebout, J.; Balis, D.; Meleti, C.; Zerefos, C. S.

doi:10.1007/s10874-005-5544-1

Cited by 71 publications

(57 citation statements)

References 20 publications

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“…Over the last decades, a host of satellite-based UV-visible instruments have been used for the monitoring of anthropogenic and volcanic SO 2 emissions. Total vertical column density (VCD) of SO 2 has been retrieved with the sensors TOMS (Krueger, 1983), GOME (Eisinger and Burrows, 1998;Thomas et al, 2005;Khokar et al, 2005), SCIAMACHY (Afe et al, 2004), OMI (Krotkov et al, 2006;Yang et al, 2007Yang et al, , 2010Li et al, 2013;Theys et al, 2015), GOME-2 Bobrowski et al, 2010;Nowlan et al, 2011;Rix et al, 2012;Hörmann et al, 2013) and OMPS . In particular, the Ozone Monitoring Instrument (OMI) has largely demonstrated the value of satellite UV-visible remote sensing (1) in monitoring volcanic plumes in near-real time (Brenot et al, 2014) and changes in volcanic degassing at the global scale , and references therein) and (2) in detecting and quantifying large anthropogenic SO 2 emissions, weak or N. Theys et al: S-5P SO 2 algorithm theoretical basis unreported emission sources worldwide (Theys et al, 2015;Fioletov et al, 2016;McLinden et al, 2016) as well as investigating their long-term changes van der A et al, 2016;He et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

et al. 2017

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Abstract. The TROPOspheric Monitoring Instrument (TROPOMI) onboard the Copernicus Sentinel-5 Precursor (S-5P) platform will measure ultraviolet earthshine radiances at high spectral and improved spatial resolution (pixel size of 7 km × 3.5 km at nadir) compared to its predecessors OMI and GOME-2. This paper presents the sulfur dioxide (SO 2 ) vertical column retrieval algorithm implemented in the S-5P operational processor UPAS (Universal Processor for UV/VIS Atmospheric Spectrometers) and comprehensively describes its various retrieval steps. The spectral fitting is performed using the differential optical absorption spectroscopy (DOAS) method including multiple fitting windows to cope with the large range of atmospheric SO 2 columns encountered. It is followed by a slant column background correction scheme to reduce possible biases or across-track-dependent artifacts in the data. The SO 2 vertical columns are obtained by applying air mass factors (AMFs) calculated for a set of representative a priori profiles and accounting for various parameters influencing the retrieval sensitivity to SO 2 . Finally, the algorithm includes an error analysis module which is fully described here. We also discuss verification results (as part of the algorithm development) and future validation needs of the TROPOMI SO 2 algorithm.

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Section: Introductionmentioning

confidence: 99%

Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

et al. 2017

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“…This effect is corrected by applying background correction method used by various studies (e.g., Khokhar et al, 2005;Lee et al, 2009) An air mass factor (AMF) is mandatory for the conversion of the retrieved slant column-integrated along the light path, into a vertical column densities (VCD-generally expressed in Dobson unit -1 DU = 2.69 × 10 16 molecules/cm 2 ). The SO 2 AMF depends strongly on surface albedo, clouds, aerosols optical properties, the vertical distribution of SO 2 , and the ozone column (Khokhar et al, 2005;Thomas et al, 2005;Khokhar et al, 2008;Krotkov et al, 2008;Lee et al, 2009).…”

Section: So 2 Retrieval Analysismentioning

confidence: 99%

Trans-Boundary Volcanic SO2 Detected over Pakistan from Satellite Observations during the Time Period 2004-2012

Khattak

Khokhar

Khan

2014

Aerosol Air Qual. Res.

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This study emphasizes on the amount of trans-boundary Sulfur dioxide (SO 2 ) present in the atmosphere of Pakistan as a consequence of various global volcanic eruptions, by using satellite data. The data products of SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY), Ozone Monitoring Instrument (OMI) and Global Ozone Monitoring Experiment-2 (GOME-2) were used for the time period of 2004-2012. SO 2 columns retrieved with Differential Optical Absorption Spectroscopy (DOAS) technique were used to perform both spatial and temporal analyses. The Nabro volcano eruption during 2011 had caused high SO 2 columns over East Africa, Middle East and South Asian regions. Daily satellite observations were used to study SO 2 plume pathway during this event. Other significant volcanic eruptions and their effects on atmospheric composition of Pakistan are also discussed. Back trajectory analysis is also performed to track the origin of air masses enriched with SO 2 column densities detected over Pakistan. Maximum SO 2 column densities of 9.4 Dobson Units (DU) were measured over Pakistan caused by Dalafilla volcanic eruption during November 2008.

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“…In order to attribute increased SO 2 values as found in satellite-based observations to a particular volcano or an active volcanic region, we apply the trajectory matching technique (Thomas et al, 2005). By means of calculating ensembles of backward trajectories starting from enhanced SO 2 column observations, the volcanic origin of such SO 2 plumes can be identified or rejected.…”

Section: Trajectory Analysismentioning

confidence: 99%

“…By matching the parcel trajectories with the first guess satellite-based SO 2 retrievals the height of the SO 2 plume is determined. The accuracy of the combined retrieval and trajectory matching approach was evaluated in Thomas et al (2005) using ground-based measurements of SO 2 and aerosols.…”

Section: Trajectory Analysismentioning

confidence: 99%

Satellite-based detection of volcanic sulphur dioxide from recent eruptions in Central and South America

et al. 2008

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Abstract. Volcanic eruptions can emit large amounts of rock fragments and fine particles (ash) into the atmosphere, as well as several gases, including sulphur dioxide (SO 2 ). These ejecta and emissions are a major natural hazard, not only to the local population, but also to the infrastructure in the vicinity of volcanoes and to aviation. Here, we describe a methodology to retrieve quantitative information about volcanic SO 2 plumes from satellite-borne measurements in the UV/Visible spectral range. The combination of a satellitebased SO 2 detection scheme and a state-of-the-art 3D trajectory model enables us to confirm the volcanic origin of trace gas signals and to estimate the plume height and the effective emission height. This is demonstrated by case-studies for four selected volcanic eruptions in South and Central America, using the GOME, SCIAMACHY and GOME-2 instruments.

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On the Retrieval of Volcanic Sulfur Dioxide Emissions from GOME Backscatter Measurements

Cited by 71 publications

References 20 publications

Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

Sulfur dioxide retrievals from TROPOMI onboard Sentinel-5 Precursor: algorithm theoretical basis

Trans-Boundary Volcanic SO2 Detected over Pakistan from Satellite Observations during the Time Period 2004-2012

Satellite-based detection of volcanic sulphur dioxide from recent eruptions in Central and South America

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