Lidar Observations of Polar Stratospheric Clouds over Ny-Aalesund in the Winters of 1994/95-1996/97: Impact of the Temperature and the Temperature History on the PSC Structure
スポンサーリンク
概要
- 論文の詳細を見る
Lidar observations of polar stratospheric clouds (PSCs) were made during three winter campaigns from 1994/95 to 1996/97 at Ny-Aalesund, Svalbard. PSCs composed mainly of solid particles were found at the beginning of most PSC events. They appeared when the temperature became lower than the assumed equilibrium temperature of nitric acid trihydrate (T_<NAT>) but sometimes appeared even at temperature a little higher than T_<NAT>. As the stratospheric temperature became very low, close to the frost point of ice (T_<ice>), PSCs composed mainly of liquid particles appeared. The behaviors of liquid PSCs observed are consistent with the expected ones, which were estimated based on the current formation theory of super cooled ternary solution (STS) particles. Results of backward trajectory analysis show that some solid PSCs experienced the temperature below T_<NAT> at least for more than 10 hours after passing through the melting point of sulfuric acid tetrahydrate. The solid PSCs which appeared at temperatures higher than T_<NAT> experienced the temperature below T_<NAT> for more than 1 day in the past. Almost no PSCs experienced the temperature lower than T_<ice> during 10 days prior to the observation. Results of trajectory analysis also suggest that the increase of the depolarization ratio depends strongly on the degree to which air parcels of PSCs cooled below T_<NAT> and on the period during which the air parcels experienced the temperature lower than the condensation point, but not on the experience of lower temperature than T_<ice>. Some liquid PSCs with a large scattering ratio (4-5) and a low depolarization ratio (0-0.005) appeared after they experienced the temperature close to T_<ice> for a few days prior to the observation.
- 社団法人日本気象学会の論文
- 2003-12-25
著者
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Shibata T
Graduate School Of Environmental Studies Nagoya Univ.
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Iwasaka Y
Graduate School Of Environmental Studies Nagoya Univ.
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Iwasaka Y
Nagoya Univ. Nagoya Jpn
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Shiraishi Kouichi
Fukuoka Univ.
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Shibata Takashi
Graduate School of Environmental Studies, Nagoya Univ.
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Iwasaka Yasunobu
Graduate School of Environmental Studies, Nagoya Univ.
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SHIRAISHI Kouichi
Department of Earth System Science, Faculty of Science, Fukuoka University
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FUJIWARA Motowo
Department of Earth System Science, Faculty of Science, Fukuoka University
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Iwasaka Y
Solar-terrestrial Environment Laboratory Nagoya University
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Iwasaka Yasunobu
Graduate School Of Environmental Studies Nagoya Univ.
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Iwasaka Yasunobu
Unmanned Aircraft Planning Group:solar Terrestrial Environmental Laboratory Nagoya University:nihon
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Fujiwara M
Fukuoka Univ.
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Fujiwara Motoo
Faculty Of Science Fukuoka University
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Fujiwara Motowo
Department Of Applied Physics Faculty Of Science Fukuoka University
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Fujiwara Motowo
Department Of Applied Physics Fukuoka University
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Shiraishi Koichi
Department Of Applied Physics Fukuoka University
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Shibata Takashi
Graduate School Of Environmental Studies Nagoya University
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Shibata T
Kitami Institute Of Technology
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Shiraishi Kouichi
Department Of Earth System Science Faculty Of Science Fukuoka University
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Shiraishi Kouichi
Faculty of Science, Fukuoka University, Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
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Fujiwara Motowo
Faculty of Science, Fukuoka University, Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
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Shibata Takashi
Graduate School of Economics, Kyoto University
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