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| Titel |
Atmospheric composition and thermodynamic retrievals from the ARIES airborne TIR-FTS system – Part 2: Validation and results from aircraft campaigns |
| VerfasserIn |
G. Allen, S. M. Illingworth, S. J. O'Shea, S. Newman, A. Vance, S. J.-B. Bauguitte, F. Marenco, J. Kent, K. Bower, M. W. Gallagher, J. Müller, C. J. Percival, C. Harlow, J. Lee, J. P. Taylor |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 12 ; Nr. 7, no. 12 (2014-12-12), S.4401-4416 |
| Datensatznummer |
250115992
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| Publikation (Nr.) |
 copernicus.org/amt-7-4401-2014.pdf |
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| Zusammenfassung |
This study validates trace gas and thermodynamic retrievals from nadir
infrared spectroscopic measurements recorded by the UK Met Office Airborne
Research Interferometer Evaluation System (ARIES) – a thermal infrared,
Fourier transform spectrometer (TIR-FTS) on the UK Facility for Airborne
Atmospheric Measurements (FAAM) BAe-146 aircraft.
Trace-gas-concentration and thermodynamic profiles have been retrieved and
validated for this study throughout the troposphere and planetary boundary
layer (PBL) over a range of environmental variability using data from aircraft
campaigns over and around London, the US Gulf Coast, and the Arctic Circle
during the Clear air for London
(ClearfLo), Joint Airborne IASI (Infrared Atmospheric Sounding Interferometer) Validation Experiment (JAIVEx), and Measurements, process studies, and Modelling (MAMM) aircraft campaigns, respectively.
Vertically resolved retrievals of temperature and water vapour (H2O),
and partial-column retrievals of methane (CH4), carbon monoxide (CO),
and ozone (O3) (over both land and sea) were compared to corresponding
measurements from high-precision in situ analysers and dropsondes operated
on the FAAM aircraft. Average degrees of freedom for signal (DOFS) over a
0–9 km column range were found to be 4.97, 3.11, 0.91, 1.10, and 1.62 for
temperature, H2O, CH4, CO, and O3, respectively, when
retrieved on 10 vertical levels. Partial-column mean biases (and bias
standard error) between the surface and ~ 9 km, when averaged
across all flight campaigns, were found to be −0.7(±0.3) K,
−479(±56) ppm, −11(±2) ppb, −3.3(±1.0) ppb, and
+3.5(±1.0) ppb, respectively, whilst the typical a posteriori
(total) uncertainties for individually retrieved profiles were 0.4,
9.5, 5.0, 21.2, and 15.0 %, respectively.
Averaging kernels (AKs) derived for progressively lower altitudes show improving
sensitivity to lower atmospheric layers when flying at lower altitudes.
Temperature and H2O display significant vertically resolved sensitivity
throughout the column, whilst trace gases are usefully retrieved only as
partial-column quantities, with maximal sensitivity for trace gases other
than H2O within a layer 1 and 2 km below the aircraft. This study
demonstrates the valuable atmospheric composition information content that
can be obtained by ARIES nadir TIR remote sensing for atmospheric process
studies. |
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