HR: 0800h
AN: A51D-0818    [Abstracts]
TI: Validation Summary and Scientific Results for ILAS-II Onboard the ADEOS-II Satellilte
AU: * Nakajima, H
EM: hide@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: Ejiri, M K
EM: ejiri.mitsumu@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Saitoh, N
EM: saitoh.naoko@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Tanaka, T
EM: tanaka.tomoaki@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: Sasano, Y
EM: sasano@nies.go.jp
AF: National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, 305-8506 Japan
AU: Irie, H
EM: irie@jamstec.go.jp
AF: Frontier Research Center for Global Change, 3173-25 Syowa-cho, Kanazawa-ku, Yokohama, 236-0001 Japan
AU: Kanzawa, H
EM: kanzawa@ihas.nagoya-u.ac.jp
AF: Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601 Japan
AB: The Improved Limb Atmospheric Spectrometer-II (ILAS-II) onboard the Advanced Earth Observing Satellite-II (ADEOS-II) was successfully launched on 14 December, 2002 from National Space Development Agency of Japan (NASDA)'s Tanegashima Space Center. ILAS-II is a solar-occultation atmospheric sensor which measures vertical profiles of O$_3$, HNO$_3$, NO$_2$, N$_2$O, CH$_4$, H$_2$O, ClONO$_2$, aerosol extinction coefficients etc. with four grating spectrometers. After the checkout period of the ILAS-II, ILAS-II started its routine operation since 2 April, 2003 until 24 October 2003 when ADEOS-II lost its function due to solar paddle failure. However, about 7 month of data were acquired by ILAS-II including whole period of Antarctic ozone hole in 2003 when ozone depletion was the largest in history. ILAS-II successfully measure vertical profiles of ozone, nitric acid, water, polar stratospheric clouds during this ozone hole period. Validations of the latest data retrieval algorithm of Version 1.4 have done for O$_3$, HNO$_3$, N$_2$O, CH$_4$, and aerosol extinction coefficients. By comparing ILAS-II Version 1.4 profiles with other correlative balloon-borne and satellite measurements, fairly good agreement was found. Using such validated ILAS-II Version 1.4 product, the characteristics of ozone depletion in the Antarctic winter-spring in 2003 was investigated. As a result, the record-high ozone depletion speed of -0.10 ppmv/day was found in September 2003 at around 18 km. Also, ILAS-II succeeded to capture small-scale periodic (around 10 days) ozone depletion at high latitudes where TOMS cannot measure. These results suggest that the existence of eccentric polar vortex and related low-temperature region in accordance with the availability of sun illumination play an important role in early spring ozone depletion.
UR: http://www-ilas2.nies.go.jp
DE: 3360 Remote sensing
DE: 1640 Remote sensing
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting