Simultaneous Multiple Wavelength Laser Radar Measurement of the Stratospheric Aerosol Layer

Iwasaka, Yasunobu; Fukunishi, H.; Hirasawa, Takeo; Fujii, Ryoichi; Miyaoka, Hiroshi

doi:10.2151/jmsj1965.61.3_469

Cited by 3 publications

References 16 publications

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The Use of Lidar in Japan for Studies of Atmospheric Environment

Takeuchi¹

1985

Topical Meeting on Optical Remote Sensing of the Atmosphere

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The data size of lidar measurement is huge just like radar. Before the introduction of computer with analog-to-digital conversion technique, the lidar data processing was an enormous task and a high accuracy data could not be expected. The recent development of computer technology has made lidar technique matured and the lidar has become a practical instrument for atmospheric research and monitoring. In Japan this occasion coincided with the time of change of air pollution aspects. After the tight regulation against the severe air pollution brought by the rapid economic growth, air pollution was reduced to the lower level. With this change, the role of lidar in Japan shifted from the high-level air pollution monitoring to the measurement of phenomena relating to air pollution, such as features of atmospheric boundary layer and dispersion of plumes in various scales. For that purpose, a large number of groups over Japan are engaging in developping the lidar technique. The groups and their locations are shown in Fig. 1, including other fields such as geodesy and millitary.

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The Use of Lidar in Japan for Studies of Atmospheric Environment

Takeuchi¹

1985

Topical Meeting on Optical Remote Sensing of the Atmosphere

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UV Lidar Measurement of Stratospheric Aerosol Layer Observational Results at Fukuoka (33.6°N) during October 1982 through May 1983

Uchino¹,

Maeda

Tokunaga

et al. 1984

Journal of the Meteorological Society of Japan

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After the volcanic eruptions of Mt. El Chichon in Mexico, increase of stratospheric aerosols has been measured by a UV lidar at a wavelength of 340.5nm at Fukuoka (33.65*N, 130.35*E) since October 1982. The altitude of the maximum backscattering ratio (Rmax* 3.5) was 24km in October 1982, and it decreased to 20km in January 1983. The value of Rmax-1 decreased by a factor of 2.4, but large changes of aerosol backscattering coefficient integrated over an altitude range of 15-30km were not recognized during this period. A brief consideration is given on this lowering of the aerosol layer.

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Large Depolarization Ratio of the Winter Antarctic Stratospheric Aerosol Layer: Lidar Measurement at Syowa Station (69°00'S, 39°35'E), Antarctica

Iwasaka

1986

Journal of the Meteorological Society of Japan

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The lidar measurement on stratospheric aerosols made at Syowa Station (69*00'S, 39*35'E), Antarctica in 1983 is described. In early winter, stratospheric aerosol content began to increase rapidly corresponding with temperature decrease. During this period, depolarization ratio of aerosol layer was low. After then, not only aerosol content but also depolarization ratio were in high level in winter 1983. These suggest that nonspherical particles were actively formed in the cold winter stratosphere, and confirm that the suggestion by Steele et al. (1983), in which increase of particulate matter in the winter polar stratosphere is assumed to be due to the growth of individual ice crystals through sublimation of water vapor molecules, is important factor controlling the winter enhancement of polar stratospheric aerosols. However, the measurement in the early winter showed that the increase in particulate matter in the winter stratosphere is not only due to the growth of individual nonspherical particles but due to some other processes. Additionally balloon measurement made on June 3rd showed that there were lots of large particles (about 15 particles cm-3) in the lower stratosphere. The growth of Aitken particle to large particle is speculated as another possible process causing the increase in particulate matter content in the winter polar stratosphere.

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Simultaneous Multiple Wavelength Laser Radar Measurement of the Stratospheric Aerosol Layer

Cited by 3 publications

References 16 publications

The Use of Lidar in Japan for Studies of Atmospheric Environment

The Use of Lidar in Japan for Studies of Atmospheric Environment

UV Lidar Measurement of Stratospheric Aerosol Layer Observational Results at Fukuoka (33.6°N) during October 1982 through May 1983

Large Depolarization Ratio of the Winter Antarctic Stratospheric Aerosol Layer: Lidar Measurement at Syowa Station (69°00'S, 39°35'E), Antarctica

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Simultaneous Multiple Wavelength Laser Radar Measurement of the Stratospheric Aerosol Layer

Cited by 3 publications

References 16 publications

The Use of Lidar in Japan for Studies of Atmospheric Environment

The Use of Lidar in Japan for Studies of Atmospheric Environment

UV Lidar Measurement of Stratospheric Aerosol Layer Observational Results at Fukuoka (33.6&deg;N) during October 1982 through May 1983

Large Depolarization Ratio of the Winter Antarctic Stratospheric Aerosol Layer: Lidar Measurement at Syowa Station (69&deg;00'S, 39&deg;35'E), Antarctica

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UV Lidar Measurement of Stratospheric Aerosol Layer Observational Results at Fukuoka (33.6°N) during October 1982 through May 1983

Large Depolarization Ratio of the Winter Antarctic Stratospheric Aerosol Layer: Lidar Measurement at Syowa Station (69°00'S, 39°35'E), Antarctica