References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-8-4759-2008

Validation of ACE-FTS N2O measurements

Strong

¹ Wolff

M. A.

¹ Kerzenmacher

T. E.

¹ Walker

K. A.

¹ ² Bernath

P. F.

² ³ Blumenstock

⁴ Boone

² Catoire

⁵ Coffey

⁶ De Mazière

⁷ Demoulin

⁸ Duchatelet

⁸ Dupuy

² Hannigan

⁶ Höpfner

⁴ Glatthor

⁴ Griffith

D. W. T.

⁹ Jin

J. J.

¹⁰ Jones

⁹ Jucks

¹¹ Kuellmann

¹² Kuttippurath

¹² ²¹ Lambert

¹³ Mahieu

⁸ McConnell

J. C.

¹⁰ Mellqvist

¹⁴ Mikuteit

⁴ Murtagh

D. P.

¹⁴ Notholt

¹² Piccolo

¹⁵ Raspollini

¹⁶ Ridolfi

¹⁷ Robert

⁵ Schneider

⁴ Schrems

¹⁸ Semeniuk

¹⁰ Senten

⁷ Stiller

G. P.

⁴ Strandberg

¹⁴ Taylor

¹ Tétard

¹⁹ Toohey

¹ Urban

¹⁴ Warneke

¹² Wood

²⁰

Department of Physics, University of Toronto, Toronto, Ontario, Canada

Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada

Department of Chemistry, University of York, York, UK

Forschungszentrum Karlsruhe and University of Karlsruhe, Institute for Meteorology and Climate Research (IMK), Karlsruhe, Germany

Laboratoire de Physique et Chimie de L'Environment CNRS – Université d'Orléans, Orléans, France

National Center for Atmospheric Research, Boulder, CO, USA

Belgian Institute for Space Aeronomy, Brussels, Belgium

Institute of Astrophysics and Geophysics, University of Liège, Liège, Belgium

School of Chemistry, University of Wollongong, Wollongong, Australia

Department of Earth and Space Science and Engineering, York University, Toronto, Ontario, Canada

Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA

Institute for Environmental Physics, University of Bremen, Bremen, Germany

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA

Department of Radio and Space Science, Chalmers University of Technology, Gothenburg, Sweden

Department of Physics, University of Oxford, Oxford, UK

Institute of Applied Physics "Nello Carrara", National Research Center, Firenze, Italy

Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Bologna, Italy

Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany

Laboratoire d'Optique Atmosphérique, Université des sciences et technologies de Lille, Villeneuve d'Ascq, France

National Institute of Water and Atmospheric Research Ltd., Lauder, New Zealand

now at: LMD/CNRS Ecole Polytechnique, Palaiseau Cedex, France

19 08 2008

8 16 4759 4786

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The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, was launched on 12 August 2003, carrying two instruments that measure vertical profiles of atmospheric constituents using the solar occultation technique. One of these instruments, the ACE Fourier Transform Spectrometer (ACE-FTS), is measuring volume mixing ratio (VMR) profiles of nitrous oxide (N2O) from the upper troposphere to the lower mesosphere at a vertical resolution of about 3–4 km. In this study, the quality of the ACE-FTS version 2.2 N2O data is assessed through comparisons with coincident measurements made by other satellite, balloon-borne, aircraft, and ground-based instruments. These consist of vertical profile comparisons with the SMR, MLS, and MIPAS satellite instruments, multiple aircraft flights of ASUR, and single balloon flights of SPIRALE and FIRS-2, and partial column comparisons with a network of ground-based Fourier Transform InfraRed spectrometers (FTIRs). Between 6 and 30 km, the mean absolute differences for the satellite comparisons lie between −42 ppbv and +17 ppbv, with most within ±20 ppbv. This corresponds to relative deviations from the mean that are within ±15%, except for comparisons with MIPAS near 30 km, for which they are as large as 22.5%. Between 18 and 30 km, the mean absolute differences for the satellite comparisons are generally within ±10 ppbv. From 30 to 60 km, the mean absolute differences are within ±4 ppbv, and are mostly between −2 and +1 ppbv. Given the small N2O VMR in this region, the relative deviations from the mean are therefore large at these altitudes, with most suggesting a negative bias in the ACE-FTS data between 30 and 50 km. In the comparisons with the FTIRs, the mean relative differences between the ACE-FTS and FTIR partial columns (which cover a mean altitude range of 14 to 27 km) are within ±5.6% for eleven of the twelve contributing stations. This mean relative difference is negative at ten stations, suggesting a small negative bias in the ACE-FTS partial columns over the altitude regions compared. Excellent correlation (R=0.964) is observed between the ACE-FTS and FTIR partial columns, with a slope of 1.01 and an intercept of −0.20 on the line fitted to the data.

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