 |
| Titel |
Strato-mesospheric ClO observations by SMILES: error analysis and diurnal variation |
| VerfasserIn |
T. O. Sato, H. Sagawa, D. Kreyling, T. Manabe, S. Ochiai, K. Kikuchi, P. Baron, J. Mendrok, J. Urban, D. Murtagh, M. Yasui, Y. Kasai |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 11 ; Nr. 5, no. 11 (2012-11-20), S.2809-2825 |
| Datensatznummer |
250003176
|
| Publikation (Nr.) |
 copernicus.org/amt-5-2809-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Chlorine monoxide (ClO) is the key species for anthropogenic ozone losses in
the middle atmosphere. We observed ClO diurnal variations using the
Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) on the
International Space Station, which has a non-sun-synchronous orbit. This
includes the first global observations of the ClO diurnal variation from the
stratosphere up to the mesosphere. The observation of mesospheric ClO was
possible due to 10–20 times better signal-to-noise (S/N) ratio of the
spectra than those of past or ongoing microwave/submillimeter-wave
limb-emission sounders. We performed a quantitative error analysis for the
strato- and mesospheric ClO from the Level-2 research (L2r) product version
2.1.5 taking into account all possible contributions of errors, i.e. errors
due to spectrum noise, smoothing, and uncertainties in radiative transfer
model and instrument functions. The SMILES L2r v2.1.5 ClO data are useful
over the range from 0.01 and 100 hPa with a total error estimate of
10–30 pptv (about 10%) with averaging 100 profiles. The SMILES ClO
vertical resolution is 3–5 km and 5–8 km for the stratosphere and
mesosphere, respectively. The SMILES observations reproduced the diurnal
variation of stratospheric ClO, with peak values at midday, observed
previously by the Microwave Limb Sounder on the Upper Atmosphere Research
Satellite (UARS/MLS). Mesospheric ClO demonstrated an opposite diurnal
behavior, with nighttime values being larger than daytime values. A ClO
enhancement of about 100 pptv was observed at 0.02 to 0.01 hPa (about
70–80 km) for 50° N–65° N from January–February 2010. The
performance of SMILES ClO observations opens up new opportunities to
investigate ClO up to the mesopause. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|