G. S. Kent, Glenn K. Yue, U. O. Farrukh, and Adarsh Deepak, "Modeling atmospheric aerosol backscatter at CO2 laser wavelengths. 1: Aerosol properties, modeling techniques, and associated problems," Appl. Opt. 22, 1655-1665 (1983)
This paper presents the results of investigations into the problems associated with modeling the atmospheric aerosol backscattering function βCO2 at CO2 laser wavelengths in the lowest 20 km of the atmosphere. It contains a summary of the relevant aerosol characteristics and their variability together with a discussion of the measurement techniques and the errors involved. The different methods of calculating βCO2 both from measured aerosol characteristics and from optical measurements made at other wavelengths are discussed in detail, and limits are placed on the accuracy of these methods. The most significant factor in determining βCO2 has been found to be the aerosol size distribution and concentration, which should be known accurately for particle radii up to at least 1 μm for stratospheric particles and 5 μm for tropospheric particles.
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Comparison of βCO2 Values Calculated from the Lower and Upper Envelopes of the Reported Aerosol Size Distributions with Noise at the Large Particle Enda
Aerosol size distributions are given by Cress17 at 0850Z on 7 July 1977 (see Fig. 5).
Aerosol size distributions are extrapolated to 30 μm, and aerosols are assumed to be dusts.
Table III
Comparison of βCO2 Values Calculated from Aerosol Size Distributions Deduced with Different Sizing Techniquesa
βCO2(m−1 sr−1)
Height (km)
From Gras and Ayers technique
From Bigg and Ono technique
From in situ white light scatter
10
1.568 × 10−11
4.068 × 10−12
1.376 × 10−11
16
3.716 × 10−12
2.184 × 10−13
2.866 × 10−12
23
6.062 × 10−12
3.785 × 10−13
3.037 × 10−12
Size distribution of aerosol particles are obtained on 10 Feb. 1978 at Mildura (34.2°S, 142.1°E) by Gras and Ayers.26 Aerosol particles are assumed to be 75% H2SO4.
Table IV
Effect of Extrapolation on the Calculated Values of βCO2
Comparison of βCO2 Values Calculated from the Lower and Upper Envelopes of the Reported Aerosol Size Distributions with Noise at the Large Particle Enda
Aerosol size distributions are given by Cress17 at 0850Z on 7 July 1977 (see Fig. 5).
Aerosol size distributions are extrapolated to 30 μm, and aerosols are assumed to be dusts.
Table III
Comparison of βCO2 Values Calculated from Aerosol Size Distributions Deduced with Different Sizing Techniquesa
βCO2(m−1 sr−1)
Height (km)
From Gras and Ayers technique
From Bigg and Ono technique
From in situ white light scatter
10
1.568 × 10−11
4.068 × 10−12
1.376 × 10−11
16
3.716 × 10−12
2.184 × 10−13
2.866 × 10−12
23
6.062 × 10−12
3.785 × 10−13
3.037 × 10−12
Size distribution of aerosol particles are obtained on 10 Feb. 1978 at Mildura (34.2°S, 142.1°E) by Gras and Ayers.26 Aerosol particles are assumed to be 75% H2SO4.
Table IV
Effect of Extrapolation on the Calculated Values of βCO2