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Antarctic ozone now decreasing symposium
breaks. A useful open meeting of the URSI Incoherent Scatter Working Group, chaired by V. B. Wickwar, took place during the symposium. The only regret was that the heavy programme tended to curtail discussion. Grateful thanks are due to NCAR, and in particular to A. D. Richmond and K. Drake for their ogranization of this event, which amply fulfilled the objectives. I hope that URSI will continue to sponsor such events.
1.4. ANTARCTIC OZONE NOW DECREASING SYMPOSIUM’“’
NIPR, Japan, 11 December 1986 The Symposium entitled ‘Antarctic Ozone Now Decreasing’ was held at the National Institute of Polar Research (NIPR) in Japan on 11 December 1986 as a special session of the Ninth Symposium on Polar Meteorology and Glaciology (a domestic symposium held every year at NIPR). However, two foreign scientists participated in this special session: A. J. Krueger (NASA/ Goddard) and J. C. Farman (British Antarctic Survey), the latter being the first to indicate with confidence the Antarctic ozone depletion from the longterm Dobson observations at Halley station (763, 27”W). The session was divided into three parts. The first (with 6 talks), chaired by T. Tominaga (Univ. Tokyo), was mainly concerned with the ozone itself; the second (with 5 papers). chaired by H. Akimoto (National Institute for Environmental Studies: NIES), treated the minor constituents other than ozone; the third part (with 7 talks), chaired by T. Matsuno (Univ. Tokyo), was devoted to the dynamical effects on the ozone distribution. The number of the participants was about 100. T. Ogawa (Univ. Tokyo) gave a brief introduction to the problem of the Antarctic ozone depletion. A. J. Krueger discussed the characteristics of the ozone hole derived from the Nimbus 7 TOMS data, and showed a 16 mm film of successive daily maps of the total ozone in 1982. (In that year, special observations of ozone were carried out at Syowa station (693, 40”E) by S. Chubachi (Meteorological Research Institute: MRI) who published the first data indicating ozone depletion.) The film gave a vivid impression of the dynamic behaviour of the ozone layer. J. C. Farman reported that he had investigated the ozone depletion and vortex movements in 1986, using surface observation data. He indicated that these data favour a chemical explanation of the ozone depletion. Y. Sekiguchi (MRI) and K. Kondo (JMA) showed the good correlation between the ozone depletion and the stratospheric temperature decrease in the ‘spring’ months at Syowa station. c”jEdited version of a report, by Dr H. Kanzawa from SCAR UAP Newsletter, April 1987.
(National
Instttute
of Polar Research,
Japan).
9
Y. Takizawa (Akita Univ.) talked about the effect of the ozone depletion on human health. K. Shibasaki (Kokugakuin Univ.) and Y. Makino (MRI) showed the results of the NO, observations at Syowa station in the year 1983. Shibasaki carried out the ground-based visible absorption spectroscopy measurements and three balloon observations in November, while Makino reported on groundbased measurements by a Fourier-transform infrared (FTIR) spectrometer. Y. Makide (Univ. Tokyo) showed the increasing tendency of the amount of halocarbons at Syowa station from 1982 to 1986. Y. Iwasaka (Nagoya Univ.) discussed the potential of aerosols as chemical reaction sites, mainly referring to lidar observations at Syowa station from 1983 to 1985. S. Hatakeyama (NIES) described his investigations of the chemical reaction rates of ClNO, obtained by an experiment he conducted at the JPL. He obtained reaction rates a few orders of magnitude lower than the values required to explain the ozone depletion by chemical process. However, he mentioned the possibility of high reaction rates on very cold aerosol surfaces. K. Kawahira (Kyoto Univ.) calculated the heating rate due to ozone and indicated the importance of albedo changes. The following three talks of the MRI group stressed the importance of the dynamical circulation: S. Chubachi inferred the vertical motion from the ozone-sonde data at Syowa station in 1982; K. Yamazaki traced air parcel motions in the height-latitude plane derived from the NMC grid analysis data; T. Sasaki investigated the impact of upward motion on the ozone distribution in his two-dimensional model. M. Shiotani (Kyoto Univ.) discussed the dynamical factors affecting ozone mixing ratios based on NMC data and the Nimbus 7 SBUV data (a study carried out during his stay at NCAR). He stressed the very vigorous activity of planetary waves in October 1979. K. Kawahira noted the interannual change of the behaviour of the seasonal variation of the Antarctic stratospheric temperature, using the NMC data. H. Tanaka (Nagoya Univ.) showed that gravity waves were strongly generated by the mesoscale mountainous undulation of the Antarctic continent, and discussed the role of gravity waves in the ozone hole (work carried out as part of a GCM study at the NASA Goddard SFC). Much discussion was generated at this symposium. However, many studies both chemical and dynamical are required to understand the phenomenon of the Antarctic ozone depletion. The Proceedings of the Ninth Symposium on Polar Meteorology and Glaciology including the papers of the ozone session will be published within the current year, and will be available from NIPR.
10
1.4. ANTARCTIC OZONE NOW DECREASING SYMPOSIUM’“’
NIPR, Japan, 11 December 1986 The Symposium entitled ‘Antarctic Ozone Now Decreasing’ was held at the National Institute of Polar Research (NIPR) in Japan on 11 December 1986 as a special session of the Ninth Symposium on Polar Meteorology and Glaciology (a domestic symposium held every year at NIPR). However, two foreign scientists participated in this special session: A. J. Krueger (NASA/ Goddard) and J. C. Farman (British Antarctic Survey), the latter being the first to indicate with confidence the Antarctic ozone depletion from the longterm Dobson observations at Halley station (763, 27”W). The session was divided into three parts. The first (with 6 talks), chaired by T. Tominaga (Univ. Tokyo), was mainly concerned with the ozone itself; the second (with 5 papers). chaired by H. Akimoto (National Institute for Environmental Studies: NIES), treated the minor constituents other than ozone; the third part (with 7 talks), chaired by T. Matsuno (Univ. Tokyo), was devoted to the dynamical effects on the ozone distribution. The number of the participants was about 100. T. Ogawa (Univ. Tokyo) gave a brief introduction to the problem of the Antarctic ozone depletion. A. J. Krueger discussed the characteristics of the ozone hole derived from the Nimbus 7 TOMS data, and showed a 16 mm film of successive daily maps of the total ozone in 1982. (In that year, special observations of ozone were carried out at Syowa station (693, 40”E) by S. Chubachi (Meteorological Research Institute: MRI) who published the first data indicating ozone depletion.) The film gave a vivid impression of the dynamic behaviour of the ozone layer. J. C. Farman reported that he had investigated the ozone depletion and vortex movements in 1986, using surface observation data. He indicated that these data favour a chemical explanation of the ozone depletion. Y. Sekiguchi (MRI) and K. Kondo (JMA) showed the good correlation between the ozone depletion and the stratospheric temperature decrease in the ‘spring’ months at Syowa station. c”jEdited version of a report, by Dr H. Kanzawa from SCAR UAP Newsletter, April 1987.
(National
Instttute
of Polar Research,
Japan).
9
Y. Takizawa (Akita Univ.) talked about the effect of the ozone depletion on human health. K. Shibasaki (Kokugakuin Univ.) and Y. Makino (MRI) showed the results of the NO, observations at Syowa station in the year 1983. Shibasaki carried out the ground-based visible absorption spectroscopy measurements and three balloon observations in November, while Makino reported on groundbased measurements by a Fourier-transform infrared (FTIR) spectrometer. Y. Makide (Univ. Tokyo) showed the increasing tendency of the amount of halocarbons at Syowa station from 1982 to 1986. Y. Iwasaka (Nagoya Univ.) discussed the potential of aerosols as chemical reaction sites, mainly referring to lidar observations at Syowa station from 1983 to 1985. S. Hatakeyama (NIES) described his investigations of the chemical reaction rates of ClNO, obtained by an experiment he conducted at the JPL. He obtained reaction rates a few orders of magnitude lower than the values required to explain the ozone depletion by chemical process. However, he mentioned the possibility of high reaction rates on very cold aerosol surfaces. K. Kawahira (Kyoto Univ.) calculated the heating rate due to ozone and indicated the importance of albedo changes. The following three talks of the MRI group stressed the importance of the dynamical circulation: S. Chubachi inferred the vertical motion from the ozone-sonde data at Syowa station in 1982; K. Yamazaki traced air parcel motions in the height-latitude plane derived from the NMC grid analysis data; T. Sasaki investigated the impact of upward motion on the ozone distribution in his two-dimensional model. M. Shiotani (Kyoto Univ.) discussed the dynamical factors affecting ozone mixing ratios based on NMC data and the Nimbus 7 SBUV data (a study carried out during his stay at NCAR). He stressed the very vigorous activity of planetary waves in October 1979. K. Kawahira noted the interannual change of the behaviour of the seasonal variation of the Antarctic stratospheric temperature, using the NMC data. H. Tanaka (Nagoya Univ.) showed that gravity waves were strongly generated by the mesoscale mountainous undulation of the Antarctic continent, and discussed the role of gravity waves in the ozone hole (work carried out as part of a GCM study at the NASA Goddard SFC). Much discussion was generated at this symposium. However, many studies both chemical and dynamical are required to understand the phenomenon of the Antarctic ozone depletion. The Proceedings of the Ninth Symposium on Polar Meteorology and Glaciology including the papers of the ozone session will be published within the current year, and will be available from NIPR.
10