HR: 1330h
AN: A42C-0774    [PDF]
TI: Polar Stratospheric Clouds Observed With ILAS-II Over Antarctica in 2003
AU: * Saitoh, N
EM: saitoh.naoko@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Nakajima, H
EM: hide@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Yokota, T
EM: yoko@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Sugita, T
EM: tsugita@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Kobayashi, H
EM: satmng@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Sasano, Y
EM: ysasano@op.cao.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AB: Improved Limb Atmospheric Spectrometer (ILAS) II was successfully launched on board ADEOS-II on December 14 in 2003, and started its continuous measurement on April 2. It measures aerosol extinction coefficients at eight window channels in the infrared. Only 780 nm extinction data were used in this study. Latitudinal coverage of ILAS-II is almost the same as that of POAM III. Sometimes coincident data can be obtained with SAGE III. ILAS-II level 2 data of aerosol extinction at 780 nm were compared with data observed with POAM III (780 nm) and SAGE III (755 nm) near ILAS-II measurement locations. In general, they showed good correspondence to each other, which validated ILAS-II 780 nm extinction data. In the Antarctic winter of 2003, ILAS-II started to observe PSCs around May 20. From June through September, collocated temperatures were often below 190 K, and many PSCs events were detected in ILAS-II data. Highest PSC sighting probability reached as much as 95 %. Some profiles were truncated at higher altitude levels because of their opacity, implying the existence of type II PSCs. Sometimes ILAS-II and POAM III observed PSCs at locations close to each other, which enabled to discuss the horizontal extent of the clouds.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0340 Middle atmosphere--composition and chemistry
DE: 1610 Atmosphere (0315, 0325)
DE: 1640 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting