Band residual difference algorithm for retrieval of SO/sub 2/ from the aura ozone monitoring instrument (OMI)

Krotkov, Nickolay A.; Carn, S. A.; Krueger, Arlin J.; Bhartia, P. K.; Yang, Kai

doi:10.1109/tgrs.2005.861932

Cited by 291 publications

(293 citation statements)

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“…scl& debug=2&geotype=st&geocode=OH&geoname= Ohio&epolmin=.&epolmax=.&epol=SO2\&sic=&netyr= 2002&geofeat=&mapsize=zsc&reqtype=getmap); typically, the reported SO 2 concentrations were nearly at the ppbv or tens of ppbv range all year around in Akron and Cleveland in recent years. Data taken from the Ozone Monitoring Instrument on the NASA EOS Aura platform (Krotkov et al, 2006) showed the average SO 2 concentration (± 1 σ ) as 0.7 ± 1.3 Dobson units (DU; 1 DU ≈1 ppbv) for the winter, 0.3 ± 0.13 DU for the spring, and 0.5 ± 0.52 DU for the fall in the planetary boundary layer in Kent, Ohio. These values were anticorrelated with the median [NH 3 ] (±1 σ ) values (60 ± 75 pptv for winter, 200 ± 120 pptv for spring, and 150 ± 80 pptv for fall), showing that when [SO 2 ] is higher, [NH 3 ] is lower.…”

Section: Discussionmentioning

confidence: 99%

A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia

et al. 2010

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Abstract. This study presents a chemical ionization mass spectrometer (CIMS) for fast response, in-situ measurements of gas phase ammonia (NH 3 ). The NH 3 background level detected with the CIMS ranged between 0.3-1 ppbv, with an uncertainty of 30 pptv under optimized conditions. The instrument sensitivity varied from 4-25 Hz/pptv for >1 MHz of reagent ion signals (protonated ethanol ions), with a 30% uncertainty estimated based on variability in calibration signals. The CIMS detection limit for NH 3 was ∼60 pptv at a 1 min integration time (3 sigma). The CIMS time response was <30 s. This new NH 3 -CIMS has been used for ambient measurements in Kent, Ohio, for several weeks throughout three seasons. The measured NH 3 mixing ratios were usually at the sub-ppbv level and higher in spring (200 ± 120 pptv) than in winter (60 ± 75 pptv) and fall (150 ± 80 pptv). High emissions of SO 2 from power plants in this region, and thus possible high acidity of aerosol particles, may explain these low NH 3 mixing ratios in general.

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Section: Discussionmentioning

confidence: 99%

A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia

et al. 2010

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“…[5] The OMI sensor retrieves planetary boundary layer (PBL) SO 2 column amounts from measurements of backscattered solar UV (BUV) radiation in the wavelength range of 311-315 nm using a Band Residual Difference (BRD) algorithm [Krotkov et al, 2006[Krotkov et al, , 2008. The retrieved SO 2 slant column density (SCD) (i.e., the effective total column along the mean path of BUV photons) is converted to the total SO 2 vertical column density (VCD) in Dobson Units (1 DU = 2.69 × 10 16 molecules/cm 2 ) using an air mass factor (AMF),…”

Section: Methodsmentioning

confidence: 99%

Recent large reduction in sulfur dioxide emissions from Chinese power plants observed by the Ozone Monitoring Instrument

Zhang

Krotkov

et al. 2010

Geophysical Research Letters

172

162

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[1] The Ozone Monitoring Instrument (OMI) aboard NASA's Aura satellite observed substantial increases in total column SO 2 and tropospheric column NO 2 from 2005 to 2007, over several areas in northern China where large coal-fired power plants were built during this period. The OMI-observed SO 2 /NO 2 ratio is consistent with the SO 2 / NO x emissions estimated from a bottom-up approach. In 2008 over the same areas, OMI detected little change in NO 2 , suggesting steady electricity output from the power plants. However, dramatic reductions of SO 2 emissions were observed by OMI at the same time. These reductions confirm the effectiveness of the flue-gas desulfurization (FGD) devices in reducing SO 2 emissions, which likely became operational between 2007 and 2008. This study further demonstrates that the satellite sensors can monitor and characterize anthropogenic emissions from large point sources.

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“…The first algorithm to retrieve SO 2 columns from space-borne UV measurements was developed based on a few wavelength pairs (for TOMS) and has been subsequently applied and refined for OMI measurements (e.g., Krotkov et al, 2006;Yang et al, 2007, and references therein). Current algorithms exploit back-scattered radiance measurements in a wide spectral range using a direct fitting approach Nowlan et al, 2011), a principal component analysis (PCA) method (Li et al, 2013) or (some form of) differential optical absorption spectroscopy (DOAS; Platt and Stutz, 2008); see, e.g., Richter et al (2009), Hörmann et al (2013), or Theys et al (2015.…”

Section: Algorithm Descriptionmentioning

confidence: 99%

“…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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Band residual difference algorithm for retrieval of SO/sub 2/ from the aura ozone monitoring instrument (OMI)

Cited by 291 publications

References 21 publications

A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia

A Chemical Ionization Mass Spectrometer for ambient measurements of Ammonia

Recent large reduction in sulfur dioxide emissions from Chinese power plants observed by the Ozone Monitoring Instrument

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

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