retrievals of formaldehyde from ground-based ftir and max-doas observations at the jungfraujoch station and comparisons with geos-chem and images model simulations

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2015
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Abstract
As an ubiquitous product of the oxidation of many volatile organic compounds (VOCs), formaldehyde (HCHO) plays a key role as a short-lived and reactive intermediate in the atmospheric photo-oxidation pathways leading to the formation of tropospheric ozone and secondary organic aerosols. In this study, HCHO profiles have been successfully retrieved from ground-based Fourier transform infrared (FTIR) solar spectra and UV-visible Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) scans recorded during the July 2010–December 2012 time period at the Jungfraujoch station (Swiss Alps, 46.5° N, 8.0° E, 3580 m a.s.l.). Analysis of the retrieved products has revealed different vertical sensitivity between both remote sensing techniques. Furthermore, HCHO amounts simulated by two state-of-the-art chemical transport models (CTMs), GEOS-Chem and IMAGES v2, have been compared to FTIR total columns and MAX-DOAS 3.6–8 km partial columns, accounting for the respective vertical resolution of each ground-based instrument. Using the CTM outputs as the intermediate, FTIR and MAX-DOAS retrievals have shown consistent seasonal modulations of HCHO throughout the investigated period, characterized by summertime maximum and wintertime minimum. Such comparisons have also highlighted that FTIR and MAX-DOAS provide complementary products for the HCHO retrieval above the Jungfraujoch station. Finally, tests have revealed that the updated IR parameters from the HITRAN 2012 database have a cumulative effect and significantly decrease the retrieved HCHO columns with respect to the use of the HITRAN 2008 compilation.
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franco2015atmosphericretrievals Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;B. Franco;F. Hendrick;M. Van Roozendael;J.-F. Müller;T. Stavrakou;E. A. Marais;B. Bovy;W. Bader;C. Fayt;C. Hermans;B. Lejeune;G. Pinardi;C. Servais;E. Mahieu
Journal bioorganic & medicinal chemistry
Year 2015
DOI
10.5194/amt-8-1733-2015
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