Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE)

E. Dupuy 1 K. A. Walker 1, 2 J. Kar 2 C. D. Boone 1 C. T. Mcelroy 2, 3 P. F. Bernath 1, 4 J. R. Drummond 2, 5 R. Skelton 1 S. D. Mcleod 1 R. C. Hughes 1 C. R. Nowlan 2 D. G. Dufour 6 J. Zou 2 F. Nichitiu 2 K. Strong 2 P. Baron 7 R. M. Bevilacqua 8 T. Blumenstock 9 G. E. Bodeker 10 T. Borsdorff 11 A. E. Bourassa 12 H. Bovensmann 13 I. S. Boyd A. Bracher 13 C. Brogniez 14 J. P. Burrows 13 Valéry Catoire 15 S. Ceccherini 16 S. Chabrillat 17 T. Christensen 18 M. T. Coffey 19 U. Cortesi 16 J. Davies 3 C. de Clercq 17 D. A. Degenstein 12 M. de Mazière 17 P. Demoulin 20 J. Dodion 17 B. Firanski 3 H. Fischer 9 G. Forbes 21 L. Froidevaux 22 D. Fussen 17 P. Gerard 17 Sophie Godin-Beekmann 23 Florence Goutail 23 J. Granville 17 D. Griffith 24 C. S. Haley 25 J. W. Hannigan 19 M. Höpfner 9 J. J. Jin 26 A. Jones 27 N. B. Jones 24 K. Jucks 28 A. Kagawa 7, 29 Y. Kasai 7 T. E. Kerzenmacher 2 A. Kleinböhl 22, 13 A. R. Klekociuk 30 I. Kramer 9 H. Küllmann 13 J. Kuttippurath 23, 13 E. Kyrölä 31 J.-C. Lambert 17 N. J. Livesey 22 E. J. Llewellyn 12 N. D. Lloyd 12 E. Mahieu 20 G. L. Manney 22, 32 B. T. Marshall 33 J. C. Mcconnell 26 M. P. Mccormick 34 I. S. Mcdermid 22 M. Mchugh 33 C. A. Mclinden 3 J. Mellqvist 27 K. Mizutani 7 Y. Murayama 7 D. P. Murtagh 27 H. Oelhaf 9 A. Parrish 35 S. V. Petelina 12, 36 C. Piccolo 37 Jean-Pierre Pommereau 23 C. E. Randall 38 C. Robert 15 C. Roth 12 M. Schneider 9 C. Senten 17 T. Steck 9 A. Strandberg 27 K. B. Strawbridge 3 R. Sussmann 11 D. P. J. Swart 39 D. W. Tarasick 3 J. R. Taylor 2 C. Tétard 14 L. W. Thomason 34 A. M. Thompson 40 M. B. Tully 41 Jakub Urban 27 F. Vanhellemont 17 T. von Clarmann 9 P. von der Gathen 42 C. von Savigny 13 J. W. Waters 22 J. C. Witte 43, 44 M. Wolff 2 J. M. Zawodny 34
Abstract : This paper presents extensive validation analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: the ACE Fourier Transform Spectrometer (ACE-FTS) and the Measurement of Aerosol Extinction in the Stratosphere and Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. The ACE satellite instruments operate in the mid-infrared and ultraviolet-visible-near-infrared spectral regions using the solar occultation technique. In order to continue the long-standing record of solar occultation measurements from space, a detailed quality assessment is required to evaluate the ACE data and validate their use for scientific purposes. Here we compare the latest ozone data products from ACE-FTS and ACE-MAESTRO with coincident observations from satellite-borne, airborne, balloon-borne and ground-based instruments, by analysing volume mixing ratio profiles and partial column densities. The ACE-FTS version 2.2 Ozone Update product reports more ozone than most correlative measurements from the upper troposphere to the lower mesosphere. At altitude levels from 16 to 44 km, the mean differences range generally between 0 and +10% with a slight but systematic positive bias (typically +5%). At higher altitudes (45–60 km), the ACE-FTS ozone amounts are significantly larger than those of the comparison instruments by up to ~40% (typically +20%). For the ACE-MAESTRO version 1.2 ozone data product, agreement within ±10% (generally better than ±5%) is found between 18 and 40 km for the sunrise and sunset measurements. At higher altitudes (45–55 km), systematic biases of opposite sign are found between the ACE-MAESTRO sunrise and sunset observations. While ozone amounts derived from the ACE-MAESTRO sunrise occultation data are often smaller than the coincident observations (by as much as -10%), the sunset occultation profiles for ACE-MAESTRO show results that are qualitatively similar to ACE-FTS and indicate a large positive bias (+10 to +30%) in this altitude range. In contrast, there is no significant difference in bias found for the ACE-FTS sunrise and sunset measurements. These systematic effects in the ozone profiles retrieved from the measurements of ACE-FTS and ACE-MAESTRO are being investigated. This work shows that the ACE instruments provide reliable, high quality measurements from the tropopause to the upper stratosphere and can be used with confidence in this vertical domain.
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E. Dupuy, K. A. Walker, J. Kar, C. D. Boone, C. T. Mcelroy, et al.. Validation of ozone measurements from the Atmospheric Chemistry Experiment (ACE). Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2008, 8 (1), pp.2513-2656. ⟨hal-00328302⟩

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