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Clerbaux, Cathy; George, Maya; Turquety, Solène; Walker, K. A.; Barret, B.; Bernath, P.; Boone, C.; Borsdorff, T.; Cammas, Jean-Pierre; Catoire, Valéry; Coffey, M.; Coheur, P.-F.; Deeter, M.; De Mazière, M.; Drummond, J.; Duchatelet, P.; Dupuy, E.; De Zafra, R.; Eddounia, F.; Edwards, D. P.; Emmons, L.; Funke, B.; Gille, J.; Griffith, D. W. T.; Hannigan, J.; Hase, F.; Höpfner, M.; Jones, N.; Kagawa, A.; Kasai, Y. ... view all 52 authors View less authors (2007)
Publisher: European Geosciences Union
Languages: English
Types: Article
Subjects: DOAJ:Earth and Environmental Sciences, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, QD1-999, ACE-FTS, PROGRAM, TROPOSPHERE, NORTHERN, QC801-809, CARBON-MONOXIDE, AURA MISSION, RETRIEVAL, GE1-350, DOAJ:Environmental Sciences, Physics, : Earth sciences & physical geography [G02] [Physical, chemical, mathematical & earth Sciences], STATION, validation, CHEMISTRY, G, Geography. Anthropology. Recreation, carbon monoxide, FTIR SPECTROSCOPY, Geophysics. Cosmic physics, : Sciences de la terre & géographie physique [G02] [Physique, chimie, mathématiques & sciences de la terre], MLS, Environmental sciences, QC1-999
International audience; The Atmospheric Chemistry Experiment (ACE) mission was launched in August 2003 to sound the atmosphere by solar occultation. Carbon monoxide (CO), a good tracer of pollution plumes and atmospheric dynamics, is one of the key species provided by the primary instrument, the ACE-Fourier Transform Spectrometer (ACE-FTS). This instrument performs measurements in both the CO 1-0 and 2-0 ro-vibrational bands, from which vertically resolved CO concentration profiles are retrieved, from the mid-troposphere to the thermosphere. This paper presents an updated description of the ACE-FTS version 2.2 CO data product, along with a comprehensive validation of these profiles using available observations (February 2004 to December 2006). We have compared the CO partial columns with ground-based measurements using Fourier transform infrared spectroscopy and millimeter wave radiometry, and the volume mixing ratio profiles with airborne (both high-altitude balloon flight and airplane) observations. CO satellite observations provided by nadir-looking instruments (MOPITT and TES) as well as limb-viewing remote sensors (MIPAS, SMR and MLS) were also compared with the ACE-FTS CO products. We show that the ACE-FTS measurements provide CO profiles with small retrieval errors (better than 5% from the upper troposphere to 40 km, and better than 10% above). These observations agree well with the correlative measurements, considering the rather loose coincidence criteria in some cases. Based on the validation exercise we assess the following uncertainties to the ACE-FTS measurement data: better than 15% in the upper troposphere (8–12 km), than 30% in the lower stratosphere (12–30 km), and than 25% from 30 to 100 km.
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    • 5 The Odin satellite was launched in February 2001 into a circular, sun-synchronous, quasi-polar orbit at 600 km altitude, with an inclination of 97.8◦ and ascending node crossing at 18:00 local time (Murtagh et al., 2002). The Sub-Millimetre Radiometer (SMR) aboard Odin measures thermal emission lines at the Earth's limb in the 486- 581 GHz spectral range (Frisk et al., 2003). Measurements of CO and O3 in the SMR
    • 10 strato-mesospheric mode (vertical scan range of 7-110 km) are performed regularly (one or two days per month since 2004) by observing rotational lines at 576.27 GHz (CO) and 576.52 GHz (O3). The horizontal resolution is on the order of 600 km, with a horizontal spacing along the orbit track of ∼950 km. The SMR CO data product discussed here is version-225 (or CTSO-v225, for Chaˆıne
    • 15 de Traitement Scientifique Odin), the reference version maintained at the Laboratoire d'Ae´rologie (Toulouse, France). CO profiles are retrieved from ∼20 km to the lower thermosphere, with a typical resolution of 3 km throughout. The single-scan precision is estimated at better than 25 ppbv in the stratosphere increasing up to 1-2 ppmv at ∼80 km (Barret et al., 2006). The SMR CO measurements and data analysis method-
    • 20 ology were described in detail by Dupuy et al. (2004). Early qualitative comparisons with ACE-FTS were published by Jin et al. (2005), whilst a detailed comparison of SMR/Odin with Aura/MLS can be found in Barret et al. (2006).
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