サガワ ヒデオ   SAGAWA HIDEO
  佐川 英夫
   所属   京都産業大学  理学部 宇宙物理・気象学科
   職種   教授
言語種別 英語
発行・発表の年月 2014
形態種別 研究論文
査読 査読あり
標題 Vertical profile of delta(OOO)-O-18 from the middle stratosphere to lower mesosphere from SMILES spectra
執筆形態 その他
掲載誌名 ATMOSPHERIC MEASUREMENT TECHNIQUES
出版社・発行元 COPERNICUS GESELLSCHAFT MBH
巻・号・頁 7(4),pp.941-958
著者・共著者 T. O. Sato,H. Sagawa,N. Yoshida,Y. Kasai
概要 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 delta(OOO)-O-18 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 delta(OOO)-O-18 by averaging the SMILES measurements at the latitude range of 20 to 40 degrees N from February to March in 2010 with solar zenith angle < 80 degrees was 13% (at 32 km) with the systematic error of about 5 %. SMILES and past measurements were in good agreement, with delta(OOO)-O-18 increasing with altitude between 30 and 40 km. The vertical profile of delta(OOO)-O-18 obtained in this study showed an increase and a decrease with altitude in the stratosphere and mesosphere, respectively. The delta(OOO)-O-18 peak, 18 %, is found at the stratopause. The delta(OOO)-O-18 has a positive correlation with temperature in the range of 220255 K, indicating that temperature can be a dominant factor to control the vertical profile of delta(OOO)-O-18 in the stratosphere and mesosphere. This is the first report of the observation of delta(OOO)-O-18 over a wide altitude range extending from the stratosphere to the mesosphere (28-57 km).
DOI 10.5194/amt-7-941-2014
ISSN 1867-1381/1867-8548