Ozone UV spectroscopy. II. Absorption cross-sections and temperature dependence

Malicet, J.; Daumont, D.; Charbonnier, Jean; Parisse, C.; Chakir, A.; Brion, J.

doi:10.1007/bf00696758

Cited by 374 publications

(389 citation statements)

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“…The fitting includes amplitudes for the effective temperature of the ozone absorption, NO 2 absorption and for spectral interference signatures (instrumental undersampling, Ring-effect filling-in of solar Fraunhofer features), and a provision for earthshine/solar spectra wavelength registration offsets. In the retrieval, the use of Daumont-BrionMalicet ozone cross sections (Malicet et al, 1995;Brion et al, 1998) convolved with the GOME-2 instrument slit function (Siddans et al, 2006) provides the most consistent and stable results for GOME-2 .…”

Section: Gome-2 Total Ozonementioning

confidence: 99%

Tropical tropospheric ozone column retrieval for GOME-2

et al. 2014

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Abstract. This paper presents the operational retrieval of tropical tropospheric ozone columns (TOCs) from the Second Global Ozone Monitoring Experiment (GOME-2) instruments using the convective-cloud-differential (CCD) method. The retrieval is based on total ozone and cloud property data provided by the GOME Data Processor (GDP) 4.7, and uses above-cloud and clear-sky ozone column measurements to derive a monthly mean TOC between 20 • N and 20 • S. Validation of the GOME-2 TOC with several tropical ozonesonde sites shows good agreement, with a high correlation between the GOME-2 and sonde measurements, and small biases within ∼ 3 DU. The TOC data have been used in combination with tropospheric NO 2 measurements from GOME-2 to analyse the effect of the 2009-2010 El Niño-Southern Oscillation (ENSO) on the tropospheric ozone distribution in the tropics. El Niño induced dry conditions in September-October 2009 resulted in relatively high tropospheric ozone columns over the southern Indian Ocean and northern Australia, while La Niña conditions in September-October 2010 resulted in a strong increase in tropospheric NO 2 in South America, and enhanced ozone in the eastern Pacific and South America. Comparisons of the GOME-2 tropospheric ozone data with simulations of the ECHAM/MESSy Atmospheric Chemistry (EMAC) model for 2009 El Niño conditions illustrate the usefulness of the GOME-2 TOC measurements in evaluating chemistry climate models (CCMs). Evaluation of CCMs with appropriate satellite observations helps to identify strengths and weaknesses of the model systems, providing a better understanding of driving mechanisms and adequate relations and feedbacks in the Earth atmosphere, and finally leading to improved models.

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Section: Gome-2 Total Ozonementioning

confidence: 99%

Tropical tropospheric ozone column retrieval for GOME-2

et al. 2014

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“…Ozone retrieval requires the use of measured laboratory high-spectral-resolution absorption coefficients (Brion et al 1993(Brion et al , 1998Daumont et al 1992;Malicet et al 1995). The EPIC-measured reflectance spectra are compared with a set of radiative transfer-derived lookup tables for the EPIC filter transmission functions and for a wide range of ozone values.…”

Section: Products Epic Ozone and Lambert Equivalent Reflectivity Retmentioning

confidence: 99%

Earth Observations from DSCOVR EPIC Instrument

Marshak

Herman

Szabo

et al. 2018

Bulletin of the American Meteorological Society

138

140

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The National Oceanic and Atmospheric Administration (NOAA) Deep Space Climate Observatory (DSCOVR) spacecraft was launched on 11 February 2015 and in June 2015 achieved its orbit at the first Lagrange point (L1), 1.5 million km from Earth toward the sun. There are two National Aeronautics and Space Administration (NASA) Earth-observing instruments on board: the Earth Polychromatic Imaging Camera (EPIC) and the National Institute of Standards and Technology Advanced Radiometer (NISTAR). The purpose of this paper is to describe various capabilities of the DSCOVR EPIC instrument. EPIC views the entire sunlit Earth from sunrise to sunset at the backscattering direction (scattering angles between 168.5° and 175.5°) with 10 narrowband filters: 317, 325, 340, 388, 443, 552, 680, 688, 764, and 779 nm. We discuss a number of preprocessing steps necessary for EPIC calibration including the geolocation algorithm and the radiometric calibration for each wavelength channel in terms of EPIC counts per second for conversion to reflectance units. The principal EPIC products are total ozone (O3) amount, scene reflectivity, erythemal irradiance, ultraviolet (UV) aerosol properties, sulfur dioxide (SO2) for volcanic eruptions, surface spectral reflectance, vegetation properties, and cloud products including cloud height. Finally, we describe the observation of horizontally oriented ice crystals in clouds and the unexpected use of the O2 B-band absorption for vegetation properties.

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“…For this purpose we calculate the ozone absorption coefficients for the four ozone cross sections evaluated in the "ACSO" committee ("Absorption Cross Sections of Ozone") (Orphal et al, 2016). Among the available data sets there are versions of Bass and Paur (1985) cross-sections denoted as Brewer operational (Brw), IGACO quadratic coefficient (B&P), the crosssections of Daumont Brion Malicet (DBM) (Daumont et al, 1992;Brion et al, 1993;Malicet et al, 1995), and the newly recommended data set for ozone ground-based calculation by Serdyuchenco, Groshelev, Weber (SGW) (Serdyuchenko et al, 2012;Gorshelev et al, 2014;Weber et al, 2016).…”

Section: Slit Parametrizationmentioning

confidence: 99%

Wavelength calibration of Brewer spectrophotometer using a tunable pulsed laser and implications to the Brewer ozone retrieval

et al. 2018

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Abstract. In this contribution we present the wavelength calibration of the travelling reference Brewer spectrometer of the Regional Brewer Calibration Center for Europe (RBCC-E) at PTB in Braunschweig, Germany. The wavelength calibration is needed for the calculation of the ozone absorption coefficients used by the Brewer ozone algorithm. In order to validate the standard procedure for determining Brewer's wavelength scale, a calibration has been performed by using a tunable laser source at PTB in the framework of the EMRP project ENV59 ATMOZ "Traceability for the total column ozone". Here we compare these results to those of the standard procedure for the wavelength calibration of the Brewer instrument. Such a comparison allows validating the standard methodology used for measuring the ozone absorption coefficient with respect to several assumptions. The results of the laser-based calibrations reproduces those obtained by the standard operational methodology and shows that there is an underestimation of 0.8 % of the ozone absorption coefficients due to the use of the parametrized slit functions. BackgroundNowadays the primary ground-based instruments used to report total ozone column (TOC) are Dobson and Brewer spectrophotometers. Based on the irradiances measured by these instruments in the ultraviolet (UV) spectral range and on well-defined retrieval procedures, TOC values are derived. The Brewer spectrometer (Brewer, 1973;Kerr et al., 1981;Kerr, 2010) was introduced in the 1980s as an automatic device measuring direct solar UV radiation and global UV irradiance. Both the Brewer and the Dobson instruments were considered by the World Meteorological Organization (WMO) in the framework of the Global Atmosphere Watch program (GAW) as the standard instruments for TOC monitoring. The wavelength calibration is needed for calculation of the ozone absorption coefficient used by the Brewer ozone retrieval algorithm. The Brewer spectrophotometer has two operating modes. In the ozone mode, used for the total ozone column and aerosol measurements, the diffraction grating stays at a fixed position while the six operational wavelengths are selected by a rotating slit mask (Table 1). The scanning mode is used to perform spectral irradiance measurements in the UV spectral range. In this mode, the slits are fixed and the spectral scan is carried out by turning the diffraction grating. The usual wavelength calibration procedure is performed in the scanning mode by analyzing recorded emission lines of the spectral discharge lamps, which are usually mercury (Hg), cadmium (Cd), and zinc (Zn). The use of the spectral lines provided in Table 2 allow us to determine the central wavelengths and the corresponding full-widthat-half-maximum (FWHM) of the slit functions as well as the relation between the positions of the grating and the corresponding instrument wavelengths (dispersion relation) required to determine the operational wavelengths used for the ozone determination. To obtain the ozone absorption coefficients, the instrument...

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Ozone UV spectroscopy. II. Absorption cross-sections and temperature dependence

Cited by 374 publications

References 10 publications

Tropical tropospheric ozone column retrieval for GOME-2

Tropical tropospheric ozone column retrieval for GOME-2

Earth Observations from DSCOVR EPIC Instrument

Wavelength calibration of Brewer spectrophotometer using a tunable pulsed laser and implications to the Brewer ozone retrieval

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