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| Titel |
Validation of ACE-FTS N2O measurements |
| VerfasserIn |
K. Strong, M. A. Wolff, T. E. Kerzenmacher, K. A. Walker, P. F. Bernath, T. Blumenstock, C. Boone, V. Catoire, M. Coffey, M. Mazière, P. Demoulin, P. Duchatelet, E. Dupuy, J. Hannigan, M. Höpfner, N. Glatthor, D. W. T. Griffith, J. J. Jin, N. Jones, K. Jucks, H. Kuellmann, J. Kuttippurath, A. Lambert, E. Mahieu, J. C. McConnell, J. Mellqvist, S. Mikuteit, D. P. Murtagh, J. Notholt, C. Piccolo, P. Raspollini, M. Ridolfi, C. Robert, M. Schneider, O. Schrems, K. Semeniuk, C. Senten, G. P. Stiller, A. Strandberg, J. Taylor, C. Tetard, M. Toohey, J. Urban, T. Warneke, S. Wood |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 8, no. 16 ; Nr. 8, no. 16 (2008-08-19), S.4759-4786 |
| Datensatznummer |
250006331
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| Publikation (Nr.) |
 copernicus.org/acp-8-4759-2008.pdf |
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| Zusammenfassung |
| 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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