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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amtd-3-2367-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/amtd-3-2367-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 May 2010

28 May 2010

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This preprint was under review for the journal AMT but the revision was not accepted.

Columnar aerosol size distribution function obtained by inversion of spectral optical depth measurements for the Zanjan, Iran

A. Masoumi, A. Bayat, and H. R. Khalesifard A. Masoumi et al.
  • Institute for Advanced Studies in Basic Sciences (IASBS), P.O. Box 45195-1159, Zanjan, 45195, Iran

Abstract. We are reporting the calculated values of columnar aerosol size distribution function for atmosphere of Zanjan, a city in Northwest Iran (36.70° N, 48.51° E). Ground-based measurements of the total optical depth of the Zanjan atmosphere at 440 nm, 670 nm, 870 nm, and 1020 nm are recorded using a Cimel CE318-2 sunphotometer in the period of October 2006 to September 2008. The spectral aerosol optical depth has been obtained by subtraction of molecular optical depth from the total optical depth for each wavelength channel. Also the Ångström exponent is determined by a logarithmic fit to the aerosol optical depth when it is plotted versus the logarithm of the wavelength. Daily averages of the measured aerosol optical depth and Ångström exponent values have been implemented in an inversion algorithm for calculation of the columnar aerosol size distribution function. In this algorithm, the aerosols are considered as spheres of different size and refractive index of 1.45. We found that for 82% of the days, aerosols are in the coarse mode. For these days, more than 50% of the aerosol volume concentration has a radius >1 μm. We believe this is related to the geographical location of Zanjan in a mostly dry area and subject to frequent dust winds.

A. Masoumi et al.

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A. Masoumi et al.

A. Masoumi et al.

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