HNO3 global distributions from IASI/MetOP and ACE-FTS measurements - Correlation with O3 measurements

Abstract : We present the first global distributions of HNO3 acquired by the Infrared Atmospheric Sounding Interferometer (IASI) instrument, launched onboard the MetOp platform in October 2006. IASI is an infrared nadir-looking Fourier transform spectrometer providing atmospheric radiance spectra at 0.5 cm-1 spectral resolution, from which temperature and infrared absorbing gas concentration profiles are retrieved with global Earth coverage twice a day. A first analysis of the IASI measurements in terms of information content demonstrates the possibility of retrieving a total column for HNO3 at all latitudes with a maximal sensitivity in the middle stratosphere. The retrievals are performed from IASI spectra in the atmospheric window using a fast radiative transfer model and inversion software relying on the Optimal Estimation Method. The operational processing of HNO3 is achieved since March 2008. The global distributions of the retrieved total columns for 10 months (from March to December 2008) will be presented and discussed with emphasis given to seasonal and interhemispheric variations. Correlations between IASI derived HNO3 and O3 columns inside the polar vortex will be presented and discussed. Preliminary tropospheric column distributions, obtained through subtraction, from the measured total columns, of assimilated stratospheric fields will be presented. Finally, complementary analysis of HNO3 tropospheric distributions acquired by ACE–FTS (Atmospheric Chemistry Experiment – Fourier Transform Spectrometer) during two years (February 2004 to Augustus 2006) of the ACE-Scisat mission will be shown in regard to zonal, latitudinal and seasonal distributions as well as tropospheric correlations of HNO3 with O3.
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Submitted on : Monday, December 7, 2009 - 3:05:19 PM
Last modification on : Sunday, July 21, 2019 - 6:40:50 AM

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  • HAL Id : hal-00439419, version 1

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Catherine Wespes, Pierre-François Coheur, Daniel Hurtmans, Quentin Errera, Cathy Clerbaux, et al.. HNO3 global distributions from IASI/MetOP and ACE-FTS measurements - Correlation with O3 measurements. ASSFTS 14 - International Workshop on Atmospheric Science from Space using Fourier Transform Spectrometry, May 2009, Florence, Italy. ⟨hal-00439419⟩

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