Measurements of molecular absorption spectra with the SCIAMACHY pre-flight model: instrument characterization and reference data for atmospheric remote-sensing in the 230–2380 nm region

Bogumil, K; Orphal, J.; Homann, Thorsten; Voigt, S.; Spietz, Peter; Fleischmann, Oliver; Vogel, and Emanuel; Hartmann, Matthias; Kromminga, H; Bovensmann, H.; Frerick, J.; Burrows, J. P.

doi:10.1016/s1010-6030(03)00062-5

Cited by 674 publications

(661 citation statements)

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“…Some aspects pertaining to the retrievals are characteristic to each instrument, and we give here a short overview of the main differences. [Bogumil et al, 2003] and OMI [Vandaele et al, 1998] but the differences are less than 2% at all temperatures, affecting differences in the temperature correction in the SCIAMACHY and OMI retrievals by at most 2%. We do not expect significant differences between SCIAMACHY and OMI slant columns from the fitting differences in Table 2 or from the temperature correction.…”

Section: Introductionmentioning

confidence: 92%

Intercomparison of SCIAMACHY and OMI tropospheric NO₂ columns: Observing the diurnal evolution of chemistry and emissions from space

et al. 2008

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[1] Concurrent (August 2006) measurements of tropospheric NO 2 columns from OMI aboard Aura (1330 local overpass time) and SCIAMACHY aboard Envisat (1000 local overpass time) offer an opportunity to examine the consistency between the two instruments under tropospheric background conditions and the effect of different observing times. For scenes with tropospheric NO 2 columns <5.0 Â 10 15 molecules cm À2 , SCIAMACHY and OMI agree within 1.0-2.0 Â 10 15 molecules cm À2 , consistent with the detection limits of both instruments. We find evidence for a low bias of 0.2 Â 10 15 molecules cm À2 in OMI observations over remote oceans. Over the fossil fuel source regions at northern midlatitudes, we find that SCIAMACHY observes up to 40% higher NO 2 at 1000 local time (LT) than OMI at 1330 LT. Over biomass burning regions in the tropics, SCIAMACHY observes up to 40% lower NO 2 columns than OMI. These differences are present in the spectral fitting of the data (slant column) and are augmented in the fossil fuel regions and dampened in the tropical biomass burning regions by the expected increase in air mass factor as the mixing depth rises from 1000 to 1330 LT. Using a global 3-D chemical transport model (GEOS-Chem), we show that the 1000-1330 LT decrease in tropospheric NO 2 column over fossil fuel source regions can be explained by photochemical loss, dampened by the diurnal cycle of anthropogenic emissions that has a broad daytime maximum. The observed 1000-1330 LT NO 2 column increase over tropical biomass burning regions points to a sharp midday peak in emissions and is consistent with a diurnal cycle of emissions derived from geostationary satellite fire counts.

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Section: Introductionmentioning

confidence: 92%

Intercomparison of SCIAMACHY and OMI tropospheric NO₂ columns: Observing the diurnal evolution of chemistry and emissions from space

et al. 2008

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“…The SO 2 absorption cross sections of Bogumil et al (2003) show a clear temperature dependence which has an impact on the retrieved SO 2 SCDs depending on the fitting window used. However, only one temperature (203 K) is used for the DOAS fit, therefore a temperature correction needs to be applied: SCD' = C temp .SCD.…”

Section: Temperature Correctionmentioning

confidence: 99%

“…The AMF depends on the viewing angles and illumination, surface and cloud conditions as well as on the O 3 total column, which is taken from the O 3 total column retrieval. A cloudy and clear-sky AMF is calculated using temperature-dependent cross sections for SO 2 (Bogumil et al, 2003) and O 3 (Brion et al, 1984):…”

Section: Verification Algorithmmentioning

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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“…The formaldehyde absorption spectrum in the near UV between 300 nm and 350 nm ( Fig. 1) was measured many times at different spectral resolutions (Bass et al, 1980;Cantrell, 1990;Rogers, 1990;Meller and Moortgat, 2000;Bogumil et al, 2003;Pope et al, 2005;Smith et al, 2006;Gratien et al, 2007). A recent analysis of the differences in the HCHO spectra by Hak et al (2005) (Meller and Moortgat, 2000;Cantrell, 1990) convolved to a resolution of 0.2 nm and interpolated to a wavelength grid of 0.04 nm.…”

Section: Introductionmentioning

confidence: 99%

“…The spectral resolution of the original HCHO absorption cross sections published range from 3.5 pm (Smith et al, 2006) to 0.11 nm (Bogumil et al, 2003). An effective cross section for broad-band-DOAS can be calculated using any of these cross sections by convolution with an appropriate instrument function.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

Brauers¹,

Bossmeyer²,

Dorn³

et al. 2007

Atmos. Chem. Phys.

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Abstract.The results from a simulation chamber study on the formaldehyde (HCHO) absorption cross section in the UV spectral region are presented. We performed 4 experiments at ambient HCHO concentrations with simultaneous measurements of two DOAS instruments in the atmosphere simulation chamber SAPHIR in Jülich. The two instruments differ in their spectral resolution, one working at 0.2 nm (broad-band, BB-DOAS), the other at 2.7 pm (high-resolution, HR-DOAS). Both instruments use dedicated multi reflection cells to achieve long light path lengths of 960 m and 2240 m, respectively, inside the chamber. During two experiments HCHO was injected into the clean chamber by thermolysis of well defined amounts of paraformaldehyde reaching mixing rations of 30 ppbV at maximum. The HCHO concentration calculated from the injection and the chamber volume agrees with the BB-DOAS measured value when the absorption cross section of Meller and Moortgat (2000) and the temperature coefficient of Cantrell (1990) were used for data evaluation. In two further experiments we produced HCHO in-situ from the ozone + ethene reaction which was intended to provide an independent way of HCHO calibration through the measurements of ozone and ethene. However, we found an unexpected deviation from the current understanding of the ozone + ethene reaction when CO was added to suppress possible oxidation of ethene by OH radicals. The reaction of the Criegee intermediate with CO could be 240 times slower than currently assumed. Based on the BB-DOAS measurements we could deduce a high-resolution cross section for HCHO which was not measured directly so far.

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Measurements of molecular absorption spectra with the SCIAMACHY pre-flight model: instrument characterization and reference data for atmospheric remote-sensing in the 230–2380 nm region

Cited by 674 publications

References 23 publications

Intercomparison of SCIAMACHY and OMI tropospheric NO₂ columns: Observing the diurnal evolution of chemistry and emissions from space

Intercomparison of SCIAMACHY and OMI tropospheric NO₂ columns: Observing the diurnal evolution of chemistry and emissions from space

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

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

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Measurements of molecular absorption spectra with the SCIAMACHY pre-flight model: instrument characterization and reference data for atmospheric remote-sensing in the 230–2380 nm region

Cited by 674 publications

References 23 publications

Intercomparison of SCIAMACHY and OMI tropospheric NO2 columns: Observing the diurnal evolution of chemistry and emissions from space

Intercomparison of SCIAMACHY and OMI tropospheric NO2 columns: Observing the diurnal evolution of chemistry and emissions from space

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

Investigation of the formaldehyde differential absorption cross section at high and low spectral resolution in the simulation chamber SAPHIR

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Intercomparison of SCIAMACHY and OMI tropospheric NO₂ columns: Observing the diurnal evolution of chemistry and emissions from space

Intercomparison of SCIAMACHY and OMI tropospheric NO₂ columns: Observing the diurnal evolution of chemistry and emissions from space