Aerosol size distribution measurements using a multispectral lidar system

Kolenda, J.; Mielke, B.; Rairoux, P.; Stein, B.; Weidauer, D.; Wolf, Jean‐Pierre; Woeste, L.; Castagnoli, F.; Guasta, Massimo Del; Morandi, M.; Sacco, V.; Stefanutti, L.; Venturi, V.; Zuccagnoli, L.

doi:10.1117/12.138527

Cited by 7 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Having only three parameters, the lognormal function can be used to fit even sparse data, which may include as few as three measurements. These data might be concentrations deduced from impactors [Goodman et al, 1994], dustsonde instruments [Pinnick et al, 1976;Deshler et al, 1993], lidar backscatter [Kolenda et al, 1992], aerosol extinction [Wang et al, 1989;Yue et al, 1986] or some combination of these observations. When additional distinct measurements are available (either in particle radius or in wavelength for optical sensors), more parameters are available to be fitted.…”

Section: Introductionmentioning

confidence: 99%

Retrieval of aerosol size distributions from satellite extinction spectra using constrained linear inversion

Steele¹,

Turco²

1997

J. Geophys. Res.

View full text Add to dashboard Cite

Abstract. We examine the retrievability of stratospheric aerosol size distributions from stratospheric aerosol and gas experiment (SAGE) II extinction measurements. Analytical size distributions, which have been fitted to in situ measurements, are used as a model in conjunction with a Mie scattering code to produce synthetic extinction spectra at the SAGE II observational wavelengths. These synthetic data are analyzed using a constrained linear inversion procedure to deduce the variety of particle size distributions which can satisfy them. Fidelity of the retrieval depends on the range of radii over which the inversion is carried out and the range of wavelengths over which measurements are available, but is less sensitive to the number of wavelength channels. As expected, solutions are not unique and depend upon the weighting function used to constrain the solution and the degree of "smoothness" imposed. A given set of extinction measurements may be attributed to either a unimodal or bimodal size distribution, and the selection of a single solution is always subjective to some degree. For bimodal distributions the larger particle mode can be recovered reasonably well; however, the smaller particle mode of a bimodal distribution or the single mode of the background aerosol, which lie below the experiment's sensitivity range, cannot be retrieved accurately. The retrieval of any physically reasonable solution becomes increasingly difficult in the presence of experimental error. In many simulations in which a 10% random error was added to the extinction measurements, only solutions which were strongly influenced by the weighting function could be obtained. Integrated aerosol properties, such as total surface area and volume, can be retrieved to within 25 and 15% for particles in the size range between 0.1 and 1.0/•m from the SAGE II data using this technique. However, these error estimates must be increased to account for particles lying outside this range. It is these latter parameters which are most directly applicable to global chemistry and climate change studies.

show abstract

Section: Introductionmentioning

confidence: 99%

Retrieval of aerosol size distributions from satellite extinction spectra using constrained linear inversion

Steele¹,

Turco²

1997

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…The gaseous H:SO4 condenses on preexisting aerosol drops and condensation nuclei swelling them in size and, for highly supersaturated conditions, may act through homogeneous-heteromolecular nucleation to form new aerosols [Hamill et al, 1977]. The volcanic enhancement of stratospheric aerosols has been observed to increase their number concentration by a factor of 10 and to persist for several years, for example, following the eruption of E1 Chich6n [Hofmann and Rosen, 1983; [Kolenda et al, 1992] or particle concentration, mean size, and surface area [Beyerle et al, 1994]. The Stratospheric Aerosol and Gas Experiment II (SAGE II) measures extinction profiles at wavelengths of 0.385, 0.453, 0.525, 0.6, and 1.02 gm using a solar occultation technique [McCormick, 1987].…”

Section: Introductionmentioning

confidence: 99%

Stratospheric aerosol effective radius, surface area and volume estimated from infrared measurements

Grainger¹,

Lambert²,

Rodgers³

et al. 1995

J. Geophys. Res.

View full text Add to dashboard Cite

A technique is presented for estimating the effective radius, surface area density, and volume density of stratospheric aerosols from infrared emission measurements. These parameters are required to assess the perturbation of the climate and chemical balance of the stratosphere following the largest volcanic eruption so far this century: that of Mount Pinatubo in the Philippines. The method uses a relationship between the surface area density and the volume density derived from balloon‐borne measurements of the Mount Pinatubo aerosol cloud made at Laramie, Wyoming. It is shown that the aerosol emission value is well approximated by a linear function of effective radius and aerosol volume density. The technique relies on knowing the refractive index of the aerosol cloud, which is assumed to be composed of liquid spheres of sulphuric acid and water. It is shown that the uncertainties in the current knowledge of the refractive index of sulphuric acid solutions limit the accuracy of the inversion technique. As a case study, the aerosol effective radius, surface area density, and volume density are determined from emission measurements at 12.1 μm of the Mount Pinatubo aerosol cloud made by the improved stratospheric and mesospheric sounder (ISAMS) carried on the Upper Atmospheric Research Satellite (UARS). From these measurements it is shown that five months after the eruption the core of the Mount Pinatubo cloud had a size distribution with an effective radius of 0.5 μm, a surface area density of 35 μm2 cm−3, and a volume density of 6 μm3 cm−3.

show abstract

“…Details to the retrieval technique may be found in Refs . 19,20,22). From the basic parameters of the size distribution the extinction coefficient, the optical depth, the surface-area, and mass concentration can be calculated.…”

Section: Multiwavelength-lidar Techniquementioning

confidence: 99%

Retrieval of the Pinatubo-Aerosol Optical Depth and Microphysical Parameters from Lidar Measurements.

Ansmann

Jäger

1995

The Review of Laser Engineering

View full text Add to dashboard Cite

Aerosol size distribution measurements using a multispectral lidar system

Cited by 7 publications

References 0 publications

Retrieval of aerosol size distributions from satellite extinction spectra using constrained linear inversion

Retrieval of aerosol size distributions from satellite extinction spectra using constrained linear inversion

Stratospheric aerosol effective radius, surface area and volume estimated from infrared measurements

Retrieval of the Pinatubo-Aerosol Optical Depth and Microphysical Parameters from Lidar Measurements.

Contact Info

Product

Resources

About