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Modelling radiation quantities and photolysis frequencies in the troposphere

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Abstract

STAR (System for Transfer of Atmospheric Radiation) was developed to calculate accurately and efficiently the irradiance, the actinic flux, and the radiance in the troposphere. Additionally a very efficient calculation scheme to computer photolysis frequencies for 21 different gases was evolved. STAR includes representative data bases for atmospheric constituents, especially aerosol particles. With this model package a sensitivity study of the influence of different parameter on photolysis frequencies in particular of O3 to Singlet D oxygen atoms, of NO2, and of HCHO was performed. The results show the quantitative effects of the influence of the solar zenith angle, the ozone concentration and vertical profile, the aerosol particles, the surface albedo, the temperature, the pressure, the concentration of NO2, and different types of clouds on the photolysis frequencies.

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Abbreviations

I A(τ, λ):

actinic flux

I H(τ, λ):

irradiance

L(τ, ω, μ, λ):

radiance

λ :

wavelength

ω :

azimuth angle

μ :

cosine of zenith angle

μ s :

cosine of solar zenith angle

τ :

optical depth

β s :

scattering coefficient

β c :

extinction coefficient

ε o :

single scattering albedo

p mix :

mixed phase function

g mix :

mixed asymmetry factor

J gas :

photolysis frequency

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Authors and Affiliations

  1. Meterorological Institute, University of Munich, Theresienstr, 37, D-80333, Munich, Germany

    A. Ruggaber & R. Dlugi

  2. Center for Climate System Research, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113, Tokyo, Japan

    T. Nakajima

Authors
  1. A. Ruggaber
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  2. R. Dlugi
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  3. T. Nakajima
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Ruggaber, A., Dlugi, R. & Nakajima, T. Modelling radiation quantities and photolysis frequencies in the troposphere. J Atmos Chem 18, 171–210 (1994). https://doi.org/10.1007/BF00696813

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  • DOI: https://doi.org/10.1007/BF00696813

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