Abstract
Abstract. The Global Ozone Monitoring Experiment-2 (GOME-2) Flight Model (FM) absorption cross section spectra of ozone were measured under representative atmospheric conditions in the laboratory setup at temperatures between 203 K and 293 K in the wavelength range of 230–790 nm at a medium spectral resolution of 0.24 to 0.54 nm. Since the exact ozone amounts were unknown in the gas flow system used, the measured ozone cross sections were required to be scaled to absolute cross section units using published literature data. The Hartley, Huggins and Chappuis bands were recorded simultaneously and their temperature dependence is in good agreement with previous studies (strong temperature effect in the Huggins band and weak in the Hartley and Chappuis bands). The overall agreement of the GOME-2 FM cross sections with the literature data is well within 3%. The total ozone column retrieved from the GOME-2/MetOp-A satellite using the new cross section data is within 1% compared to the ozone amounts retrieved from the standard retrieval performed for GOME-2.
Highlights
A medium spectral resolution of 0.24 to 0.54 nm
The tion mode in 2000; Munro the et a2l3.,02–07H0960y.)n.dmTroosptaleolctcgroayllurmaannngdede(nCsaitlileiessoeft al., O3, NO2 and other trace gaseEs aanrdththeSveyrstictaelmprofile of O3 are dabetseorrmptiinoendsftrroumctutrheesm(OearpsuhraeldetdSaatla.c, ui2es0i0nn2gc)t.ehSeseirvecrhaalrgacetoeprhisytsictotal ozone column retrieved from the Global Ozone Monitoring Experiment-2 (GOME-2)/MetOp-A ical quantities can be inferred from GOME-2 data such satellite using the new cross section data is within 1 % com- as cloud parameters, surface reflectivity, and aerosol optical pared to the ozone amounts retrieved from the standard re- parameters (Munro et al, 2006.)
This paper presents GOME-2 FM3 ozone absorption cross sections measured at five temperatures (203, 223, 243, 273, and 293 K) in the wavelength range 230–790 nm
Summary
(MetOp programme) will provide long-term global monitoring of trace gases together with other atmospheric chem-. Using the instrument’s own reference data (absorption cross section measured with the satellite spectrometer prior to its launch) in the trace gas retrieval might reduce the fit residuals and obviates the exact knowledge of the instrumental slit function or spectral resolution. For this purpose, laboratory absorption measurement of temperature dependent absorption cross sections under controlled in-flight conditions were performed in 2003 using the GOME-2 FM3 satellite instrument as a laboratory spectrometer during the general instrument calibration period (Gur et al, 2005; Gur, 2006). The last section presents total ozone column retrievals from GOME-2 observations using the GOME-2 FM3 ozone cross section data
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