Number concentration, size distribution and fine particle fraction of tropospheric and stratospheric aerosols--颗粒学报PARTICUOLOGY

Xu, L., Shi, G., Zhang, L., Zhou, J., & Iwasaka, Y. (2003). Number concentration, size distribution and fine particle fraction of tropospheric and stratospheric aerosols. China Particuology, 1(5), 201-205. https://doi.org/10.1016/S1672-2515(07)60142-0

Number concentration, size distribution and fine particle fraction of tropospheric and stratospheric aerosols

Li Xu ^a *, Guangyu Shi ^b, Li Zhang ^a, Jun Zhou ^c, Yasunobu Iwasaka ^d

a National Climate Center, China Meteorological Administration, Beijing 100081, P. R. China
b Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, P. R. China
c Anhui Institute of Optical and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, P. R. China
d Solar and Terrestrial Environment Laboratory, Nagoya University, Nagoya 464–8601, Japan

10.1016/S1672-2515(07)60142-0

Volume 1, Issue 5, October 2003, Pages 201-205

Received 25 August 2003, Accepted 28 September 2003, Available online 14 December 2007.

E-mail: xuli@cma.gov.cn

Highlights

Abstract

Aerosol observations were carried out at Xianghe Scientific Balloon Base (39.45°N, 117°E) using a stratospheric balloon. The particle number concentrations of the tropospheric and stratospheric aerosols were directly explored. The vertical distributions of the number concentration, number-size (that is, particle number versus particle size) distribution, and the fraction of fine particles (0.5 μm>r>0.15 μm/r>0.15 μm) are reported in this paper. The profiles of particle concentration present multi-peak phenomenon. The pattern of size distribution for atmospheric aerosol indicates a tri-modal (r=∼0.2 μm, ∼0.88 μm and ∼7.0 μm) and a bi-modal (r=∼0.13 μm and 2.0 μm). The number-size distribution almost fits the Junge distribution for particles with r<0.5 μm in the stratosphere of 1993 and the troposphere of 1994. But the distributions of coarse particles (r>0.5 μm) are not uniform. The number-size distribution exhibits also a wide size range in the troposphere of 1993. The results demonstrate that fine particles represent the major portion in the troposphere during the measurement period, reaching as high as 95% in 1994. Certain coarse particle peaks in the troposphere were attributed to clouds and other causes, and in the stratosphere to volcanic eruption. The stratospheric aerosol layer consists of unique fractions of fine or coarse particles depending on their sources. In summary, the process of gas-to-particles conversion was active and the coarse particles were rich over the Xianghe area. The measurements also demonstrate that the spatial and temporal atmospheric aetribution, fine particles fractionrosol distributions are nonuniform and changeful.

Graphical abstract

Keywords

troposphere and stratosphere; aerosol number density; number-size distribution; fine particles fraction

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