Stratospheric aerosol size distribution.

Uchino, Osamu; Hirono, Motokazu

doi:10.5636/jgg.27.201

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…The instrumental parameters of the lidar are shown in Table 1. The size distribution fuction of the aerosol particles was discussed based on the above-mentioned data from the lidar and small ion radiosonde observations at Kagoshima (UCHINO and HIRONO, 1975;HIRONO et al, 1976). The Junge layer always appeared around 21 km height and the peak value of the non-molecular radar cross section 3M for the ruby wavelength (6,943 A) lay between (1-2) X 10-9/cm during the period.…”

Section: Introductionmentioning

confidence: 99%

On the long term variations of stratospheric aerosol content after the eruption of Fuego volcano observed by lidar.

Hirono

Fujiwara

Itabe

et al. 1977

J. geomagn. geoelec

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The sudden increase of stratospheric aerosol content due to Fuego injection of volcanic substances in October 1974, and its subsequent recovery by March 1976 was observed by the lidar in Fukuoka. The observed decrease rate of the aerosol content was much slower than that deduced by using the well known Gudiksen's two-dimensional atmospheric model. The discrepancy can be explained by introducing the gas to the particle conversion effect advocated by CASTLEMAN (1974), i.e., the oxidization of SO2 gas followed by nucleation, coagulation, and condensation. These processes are able to increase the ratio of observable particles to the SO2 gas, though the total concentrations of S atoms in all kinds of molecules decrease at the rate of theoretical diffusion, which at the same time can explain the diffusion of 185W concentration in the global stratosphere after the injection at the instant of nuclear explosion.The rate of decrease of conservative tracer at 38N calculated by CADLE et al. (1976) shows good agreement with that of the aerosol content observed by lidar at the same latitude. The rate, however, shows remarkable variation with latitudes from 30 to 40N, which cannot be found in the observational results by the lidar at Fukuoka and Stanford Research Institute.

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Section: Introductionmentioning

confidence: 99%

On the long term variations of stratospheric aerosol content after the eruption of Fuego volcano observed by lidar.

Hirono

Fujiwara

Itabe

et al. 1977

J. geomagn. geoelec

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A note on the Aitken nuclei and ion flow measurements in the lower stratosphere

Podzimek

1983

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Behavior of the stratospheric aerosols inferred from laser radar and small ion radiosonde observations

Hirono¹,

Fujiwara²,

Itabe³

1976

J. Geophys. Res.

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The size distribution function of stratospheric aerosol layer is discussed based on the data by laser radar at Fukuoka and the small ion concentrations deduced from the results of radiosonde observations at Kagoshima. If we use a size distribution spectrum essentially similar to that originally proposed by Friedlander (1960), both data are explained consistently. It is shown that the obtained mass concentrations are sensitive functions of assumed refractive indices, and the order of magnitude agrees well with the aircraft sampling result. The relaxation time is examined on the above model by using gas kinetic theory in the subrange, where Knudsen number is greater than 3. It is shown that the Aitken particle concentration near the lower end of the spectrum is numerous and the rate of coagulation is adequate for the in situ formation theory of aerosols and the relaxation time of the SO2 gas oxidation required by the analysis of variations of the isotope concentration ratio [32S]/[34S] due to Castleman (1970). The influence of the volcanic injection into the stratosphere on the modification of the size distribution is briefly examined, and resulting variations of parameters are discussed.

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Stratospheric aerosol size distribution.

Cited by 6 publications

References 20 publications

On the long term variations of stratospheric aerosol content after the eruption of Fuego volcano observed by lidar.

On the long term variations of stratospheric aerosol content after the eruption of Fuego volcano observed by lidar.

A note on the Aitken nuclei and ion flow measurements in the lower stratosphere

Behavior of the stratospheric aerosols inferred from laser radar and small ion radiosonde observations

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