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.
| Reference Key |
franco2015atmosphericretrievals
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|---|---|
| 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
|
| URL | |
| Keywords |
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