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The solar spectra were taken by using a 1.5m double-pass grating monochromator with wavenumber resolution of 0.075(cm)^\u003c-1\u003e-0.137(cm)^\u003c-1\u003e, and the measurements were carried out from July to December 1991. HCl vertical column densities were observed to be (1.65±0.43)×(10)^\u003c15\u003e(cm)^\u003c-2\u003e in winter and to increase 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 temporal variation of the HF/HCl vertical column density ratios shows that only HCl was removed by chemical reactions during 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 ((4.4±1.6)×(10)^\u003c15\u003e(cm)^\u003c-2\u003e) during polar night implies that almost all HCl molecules in this altitude region were converted into other chlorine species and/or trapped in the PSC particles. Total ozone measured with a Dobson spectrophotometer shows that Syowa Station was located in the \u0027ozone hole\u0027 in mid-November, whereas the HCl vertical column density had recovered to the summer level at that time. Atmospheric temperature and wind measured with radiosondes over Syowa Station show that the air mass in the \u0027ozone hole\u0027 remained dynamically stable in August and September. The increase in HCl vertical column density from September to November is thought to be mainly due to chemical reactions. Comparing the observational result with a one-dimensional time-dependent photochemical model calculation, it is found that half of the decreased amount of HCl vertical column density was converted into active chlorine and that the remainder was converted into other less active chlorine species and/or trapped in the PSC particles. To describe the temporal variation of partitioning among chlorine species in detail, we must observe HCl, ClONO_2,and ClO simultaneously for a longer observation period, at least one year. 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STRATOSPHERIC HCL, HF, AND N_2O IN ANTARCTICA OBSERVED WITH SOLAR INFRARED ABSORPTION METHOD
https://doi.org/10.15094/00003893
https://doi.org/10.15094/00003893a98dd810-fc5e-467a-ac01-ca5007932c89
名前 / ファイル | ライセンス | アクション |
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KJ00001015010 (66.6 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1995-09-01 | |||||
タイトル | ||||||
タイトル | STRATOSPHERIC HCL, HF, AND N_2O IN ANTARCTICA OBSERVED WITH SOLAR INFRARED ABSORPTION METHOD | |||||
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 | 10.15094/00003893 | |||||
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 | STRATOSPHERIC HCL, HF, AND N_2O IN ANTARCTICA OBSERVED WITH SOLAR INFRARED ABSORPTION METHOD | |||||
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 solar infrared absorption technique at Syowa Station (69.006°S, 39.590°E), to study the chemistry and dynamics of Antarctic ozone depletion. The solar spectra were taken by using a 1.5m double-pass grating monochromator with wavenumber resolution of 0.075(cm)^<-1>-0.137(cm)^<-1>, and the measurements were carried out from July to December 1991. HCl vertical column densities were observed to be (1.65±0.43)×(10)^<15>(cm)^<-2> in winter and to increase 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 temporal variation of the HF/HCl vertical column density ratios shows that only HCl was removed by chemical reactions during 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 ((4.4±1.6)×(10)^<15>(cm)^<-2>) during polar night implies that almost all HCl molecules in this altitude region were converted into other chlorine species and/or trapped in the PSC particles. Total ozone measured with a Dobson spectrophotometer shows that Syowa Station was located in the 'ozone hole' in mid-November, whereas the HCl vertical column density had recovered to the summer level at that time. Atmospheric temperature and wind measured with radiosondes over Syowa Station show that the air mass in the 'ozone hole' remained dynamically stable in August and September. The increase in HCl vertical column density from September to November is thought to be mainly due to chemical reactions. Comparing the observational result with a one-dimensional time-dependent photochemical model calculation, it is found that half of the decreased amount of HCl vertical column density was converted into active chlorine and that the remainder was converted into other less active chlorine species and/or trapped in the PSC particles. To describe the temporal variation of partitioning among chlorine species in detail, we must observe HCl, ClONO_2,and ClO simultaneously for a longer observation period, at least one year. We should also observe other chlorine species and nitrogen species. | |||||
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 9, p. 184, 発行日 1995-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |