Enhanced Aerosols Appeared at the Tropical Tropopause over Biak Indonesia in January 2011
Enhanced aerosols have been found just above the tropical cold point tropopause by observations using lidar and balloon borne optical particle counter (OPC) in January 2011. The aerosols have one or two layers structure within the campaign period from 6th to 13th January. The width of the layer was 1-2 km. The depolarization ratio of the layer was very small (or nearly zero), and the wavelength dependence of the backscattering coefficients were similar to that of the stratospheric aerosols. The backscattering coefficient of the layer was about five times larger than the background aerosols. Cirrus cloud appeared within this aerosol layer. The estimated number concentration of the cloud particles is ~1000 /m3 . The relative humidity over ice before the ice formation is estimated to be about 110％. These microphysical characteristics of the cloud are consistent with the recent formation studies of the cirrus cloud particles nucleating on the solid aerosol particles like ammonium sulfate particles.
tropical stratosphere aerosols ice formation volcanic aerosols
Takashi Shibata Saipul Hamdi Masahiko Hayashi Kei-ichirou Hara Ayumi Naganuma Naoko Hara Suginori Iwasaki Youichi Inai Kensaku Shimizu Fumio Hasebe
Nagoya University,Furo-cho,Chikusa-ku,Nagoya 465-8601,Japan LAPAN,Jalan Dr. Djundjunan 133,Bandung 40173,Indonesia Fukuoka University,Nanakuma,Jonan-ku,Fukuoka 814-0180,Japan National Defence Academy of Japan,Hashirimizu,Yokosuka,239-8686,Japan Hokkaido University,Kita-ku,Sapporo 060-0810 ,Japan
国际会议
西安
英文
54-58
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）