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| Titel |
Comparison of SMILES ClO profiles with satellite, balloon-borne and ground-based measurements |
| VerfasserIn |
H. Sagawa, T. O. Sato, P. Baron, E. Dupuy, N. Livesey, J. Urban, T. von Clarmann, A. de Lange, G. Wetzel, B. J. Connor, A. Kagawa, D. Murtagh, Y. Kasai |
| 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 ; 6, no. 12 ; Nr. 6, no. 12 (2013-12-06), S.3325-3347 |
| Datensatznummer |
250085123
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| Publikation (Nr.) |
 copernicus.org/amt-6-3325-2013.pdf |
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| Zusammenfassung |
| We evaluate the quality of ClO profiles derived from the
Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on the
International Space Station (ISS). Version 2.1.5 of the level-2 product
generated by the National Institute of Information and Communications
Technology (NICT) is the subject of this study. Based on sensitivity studies,
the systematic error was estimated as 5–10 pptv at the pressure
range of 80–20 hPa, 35 pptv at the ClO peak altitude
(~ 4 hPa), and 5–10 pptv at
pressures ≤ 0.5 hPa for daytime mid-latitude conditions. For
nighttime measurements, a systematic error of 8 pptv was estimated
for the ClO peak altitude (~ 2 hPa). The SMILES NICT
v2.1.5 ClO profiles agree with those derived from another level-2
processor developed by the Japan Aerospace Exploration Agency (JAXA) within
the bias uncertainties, except for the nighttime measurements in the low and
middle latitude regions where the SMILES NICT v2.1.5 profiles have a negative
bias of ~ 30 pptv in the lower stratosphere. This bias is
considered to be due to the use of a limited spectral bandwidth in the
retrieval process of SMILES NICT v2.1.5, which makes it difficult to
distinguish between the weak ClO signal and wing contributions of spectral
features outside the bandwidth. In the middle and upper stratosphere outside
the polar regions, no significant systematic bias was found for the SMILES
NICT ClO profile with respect to data sets from other instruments such
as the Aura Microwave Limb Sounder (MLS), the Odin Sub-Millimetre Radiometer
(SMR), the Envisat Michelson Interferometer for Passive Atmospheric Sounding
(MIPAS), and the ground-based radiometer at Mauna Kea, which demonstrates the
scientific usability of the SMILES ClO data including the diurnal
variations. Inside the chlorine-activated polar vortex, the SMILES NICT v2.1.5
ClO profiles show larger volume mixing ratios by 0.4 ppbv
(30%) at 50 hPa compared to those of the JAXA processed
profiles. This discrepancy is also considered to be an effect of the limited
spectral bandwidth in the retrieval processing. We also compared the SMILES
NICT ClO profiles of chlorine-activated polar vortex conditions with
those measured by the balloon-borne instruments: Terahertz and submillimeter
Limb Sounder (TELIS) and the MIPAS-balloon instrument (MIPAS-B). In
conclusion, the SMILES NICT v2.1.5 ClO data can be used at
pressures ≤ ~30 hPa for scientific analysis. |
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