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| Titel |
Vertical profile of δ18OOO from the middle stratosphere to lower mesosphere from SMILES spectra |
| VerfasserIn |
T. O. Sato, H. Sagawa, N. Yoshida, 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 ; 7, no. 4 ; Nr. 7, no. 4 (2014-04-10), S.941-958 |
| Datensatznummer |
250115693
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| Publikation (Nr.) |
 copernicus.org/amt-7-941-2014.pdf |
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| Zusammenfassung |
| Ozone is known to have large oxygen isotopic enrichments of about 10% in
the middle stratosphere; however, there have been no reports of ozone
isotopic enrichments above the middle stratosphere. We derived an enrichment
δ18OOO in the stratosphere and the lower mesosphere from observations
of the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES)
onboard the International Space Station (ISS) using a retrieval algorithm
optimized for the isotopic ratio. The retrieval algorithm includes (i) an a
priori covariance matrix constrained by oxygen isotopic ratios in ozone, (ii)
an optimization of spectral windows for ozone isotopomers and isotopologues,
and (iii) common tangent height information for all windows. The
δ18OOO by averaging the SMILES measurements at the latitude range of
20 to 40° N from February to March in 2010 with solar
zenith angle < 80° was 13% (at 32 km) with the systematic
error of about 5%. SMILES and past measurements were in good agreement,
with δ18OOO increasing with altitude between 30 and 40 km. The
vertical profile of δ18OOO obtained in this study showed an increase
and a decrease with altitude in the stratosphere and mesosphere,
respectively. The δ18OOO peak, 18%, is found at the
stratopause. The δ18OOO has a positive correlation with temperature
in the range of 220–255 K, indicating that temperature can be a dominant
factor to control the vertical profile of δ18OOO in the stratosphere
and mesosphere. This is the first report of the observation of δ18OOO
over a wide altitude range extending from the stratosphere to the mesosphere
(28–57 km). |
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