Validation of the Atmospheric Chemistry Experiment (ACE) version 2.2 temperature using ground-based and space-borne measurements

R. J. Sica 1 M. R. M. Izawa 2 K. A. Walker 3, 4 C. Boone 3 S. V. Petelina 5, 6 P. S. Argall 1 P. Bernath 3, 7 G. B. Burns 8 Valéry Catoire 9 R. L. Collins 10 W. H. Daffer 11 C. de Clercq 12 Z. Y. Fan 3 B. J. Firanski 13 W. J. R. French 8 P. Gerard 12 M. Gerding 14 J. Granville 12 J. L. Innis 8 Philippe Keckhut 15 T. Kerzenmacher 4 A. R. Klekociuk 8 E. Kyrö 16 J. C. Lambert 12 E. J. Llewellyn 5 G. L. Manney 17, 18 I. S. Mcdermid 17 K. Mizutani 19 Y. Murayama 19 C. Piccolo 20 P. Raspollini 21 M. Ridolfi 22 C. Robert 9 W. Steinbrecht 23 K. B. Strawbridge 13 K. Strong 4 R. Stübi 24 B. Thurairajah 10
Abstract : An ensemble of space-borne and ground-based instruments has been used to evaluate the quality of the version 2.2 temperature retrievals from the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS). The agreement of ACE-FTS temperatures with other sensors is typically better than 2 K in the stratosphere and upper troposphere and 5 K in the lower mesosphere. There is evidence of a systematic high bias (roughly 3–6 K) in the ACE-FTS temperatures in the mesosphere, and a possible systematic low bias (roughly 2 K) in ACE-FTS temperatures near 23 km. Some ACE-FTS temperature profiles exhibit unphysical oscillations, a problem fixed in preliminary comparisons with temperatures derived using the next version of the ACE-FTS retrieval software. Though these relatively large oscillations in temperature can be on the order of 10 K in the mesosphere, retrieved volume mixing ratio profiles typically vary by less than a percent or so. Statistical comparisons suggest these oscillations occur in about 10% of the retrieved profiles. Analysis from a set of coincident lidar measurements suggests that the random error in ACE-FTS version 2.2 temperatures has a lower limit of about ±2 K.
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R. J. Sica, M. R. M. Izawa, K. A. Walker, C. Boone, S. V. Petelina, et al.. Validation of the Atmospheric Chemistry Experiment (ACE) version 2.2 temperature using ground-based and space-borne measurements. Atmospheric Chemistry and Physics Discussions, European Geosciences Union, 2007, 7 (4), pp.12463-12539. ⟨10.5194/acpd-7-12463-2007⟩. ⟨hal-00328228⟩

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