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The spectra were taken by using a 1.5m double-pass grating monochromator with wavenumber resolution of 0.09(cm)^\u003c-1\u003e. The measurements were carried out from July to December 1991. HCl vertical column densities were found to be (1.65±0.43)×(10)^\u003c15\u003e(cm)^\u003c-2\u003e in winter, and increased to (6.07±1.20)×(10)^\u003c15\u003e(cm)^\u003c-2\u003e in summer. HF and N_2O vertical column densities remained fairly constant at (1.31±0.25)×(10)^\u003c15\u003e(cm)^\u003c-2\u003e and (5.98±0.31)×(10)^\u003c18\u003e(cm)^\u003c-2\u003e, respectively, from July to December, suggesting stable dynamical conditions. The time variation of the HF/HCl ratios shows that only HCl was removed by chemical reactions during the polar night. These reactions might occur on the surfaces of the polar stratospheric cloud (PSC) particles in the altitude region between 12km and 25km. The decrease in HCl vertical column density (about 4.4×(10)^\u003c15\u003e(cm)^\u003c-2\u003e) during the polar night implies that almost all the HCl molecules in this altitude region were converted into other chlorine compounds. The temperature and wind measured by rawinsondes over Syowa Station show that the air mass in the \u0027ozone hole\u0027 remained dynamically stable, particularly in August and September. Total ozone measured by Dobson spectrometer shows that Syowa Station was located directly beneath the \u0027ozone hole\u0027 in mid-November, whereas the HCl vertical column density had recovered to the summer level at that time. These mean that the increase in HCl vertical column density from September to November is mainly due to chemical reactions. 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INFRARED ABSORPTION MEASUREMENT OF HCl, HF, AND N_2O AT SYOWA STATION
https://doi.org/10.15094/00003837
https://doi.org/10.15094/000038377289916b-65af-4de3-9d57-1f30d7c70adc
名前 / ファイル | ライセンス | アクション |
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KJ00000767945 (64.8 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1994-11-01 | |||||
タイトル | ||||||
タイトル | INFRARED ABSORPTION MEASUREMENT OF HCl, HF, AND N_2O AT SYOWA STATION | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00003837 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
記事種別(英) | ||||||
en | ||||||
ABSTRACT | ||||||
論文名よみ | ||||||
その他のタイトル | INFRARED ABSORPTION MEASUREMENT OF HCl, HF, AND N_2O AT SYOWA STATION | |||||
著者名よみ |
ムラタ, イサオ
× ムラタ, イサオ× キタ, カズユキ× イワガミ, ナオモト× オガワ, トシヒロ |
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著者名(英) |
MURATA, Isao
× MURATA, Isao× KITA, Kazuyuki× IWAGAMI, Naomoto× OGAWA, Toshihiro |
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著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Physics, Graduate School of Science, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Physics, Graduate School of Science, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Physics, Graduate School of Science, University of Tokyo | ||||||
著者所属(英) | ||||||
en | ||||||
Department of Earth and Planetary Physics, Graduate School of Science, University of Tokyo | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Vertical column densities of HCl, HF, and N_2O were observed using the solar infrared absorption method at Syowa Station, to study the chemistry and dynamics of Antarctic ozone depletion. The spectra were taken by using a 1.5m double-pass grating monochromator with wavenumber resolution of 0.09(cm)^<-1>. The measurements were carried out from July to December 1991. HCl vertical column densities were found to be (1.65±0.43)×(10)^<15>(cm)^<-2> in winter, and increased to (6.07±1.20)×(10)^<15>(cm)^<-2> in summer. HF and N_2O vertical column densities remained fairly constant at (1.31±0.25)×(10)^<15>(cm)^<-2> and (5.98±0.31)×(10)^<18>(cm)^<-2>, respectively, from July to December, suggesting stable dynamical conditions. The time variation of the HF/HCl ratios shows that only HCl was removed by chemical reactions during the polar night. These reactions might occur on the surfaces of the polar stratospheric cloud (PSC) particles in the altitude region between 12km and 25km. The decrease in HCl vertical column density (about 4.4×(10)^<15>(cm)^<-2>) during the polar night implies that almost all the HCl molecules in this altitude region were converted into other chlorine compounds. The temperature and wind measured by rawinsondes over Syowa Station show that the air mass in the 'ozone hole' remained dynamically stable, particularly in August and September. Total ozone measured by Dobson spectrometer shows that Syowa Station was located directly beneath the 'ozone hole' in mid-November, whereas the HCl vertical column density had recovered to the summer level at that time. These mean that the increase in HCl vertical column density from September to November is mainly due to chemical reactions. A comparison with the calculation from a one-dimensional time-dependent photochemical model shows that half of the decrease in HCl vertical column density is converted into active chlorines and that the remainder is converted into other chlorine compounds or trapped in the PSC particles. | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA10756213 | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Polar Meteorology and Glaciology 巻 8, p. 180, 発行日 1994-11 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |