e-book Ground-Based Aerosol Optical Depth Measurement Using Sunphotometers

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Email Address. Sign In. Access provided by: anon Sign Out. These well characterized instruments CIMEL Sun photometer make aerosol optical depth measurements based on the transmission of the direct sunlight through the atmosphere in 5 and 8 spectral bands.

Optical Thickness Data: Bruegge (FIFE)

AERONET aerosol retrievals are limited to clear sky conditions no clouds or no cirrus clouds and retrieve aerosol optical depth. AERONET aerosol retrievals are limited to clear sky conditions no clouds or no cirrus clouds and retrieve aerosol optical depth. To retrieve other parameters such as aerosol size distribution, single scattering albedo, refractive index, etc.


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Since the algorithms are limited to clear sky conditions and not available to the public, we decided to write our own retrieval algorithm which uses the solar principal plane and almucantar scans from the CIMEL instrument. We studied a variety of radiative transfer methods that are able to simulate ground measurements by computing the hemispherical sky radiance.

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For various reasons we decided to use the Santa Barbara DISORT Atmospheric Radiative Transfer SBDART code [4,5] and combined it with IDL's Amoeba down-hill simplex method [3] to retrieve five parameters: 1 water cloud optical depth, 2 ice cloud optical depth, 3 cloud water droplet radius, 4 horizontal visibility related to aerosol optical depth , and 5 RH factor which couples relative humidity and aerosol size distribution, from principal plane and almucantar scans.

During subsequent seasons, the aerosol may have persisted due to processes that favor vaporization at high altitudes and regeneration of particles at lower altitudes Hofmann and Rosen, The formation of the vortex each winter probably prevented further elimination by natural processes because atmospheric mixing within the vortex is minimal. Although not quantified, it appears that a similar situation existed after the eruption of El Chichon refer again to Figure 9.

A representative set of sunphotometer data collected during spring was used to quantify the opacity of the Alaskan Arctic stratosphere and to characterize the microphysical properties of volcanic aerosols transported to that region following the eruptions of Mount Pinatubo.

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The observed visible optical depths 0. The microphysical properties of the Pinatubo aerosols can be described in terms of an effective size distribution that is bimodal, having a large-particle volcanic mode at 0. On the basis of our limited data, the decay rate e-folding time of optical depth is estimated to be about 14 months at Barrow , which suggests a slower decay than has been observed for earlier post-volcanic periods. Because of the increased opacity of the stratosphere and the apparent longevity of the volcanic aerosols present in the Arctic, direct radiative forcing in that region and indirect climate perturbations via feedbacks on a much broader geographical scale may have resulted, but have not yet been studied in any detail.

Herbert , G.

Hofmann , D. Rosen, On the prolonged lifetime of the El Chichon sulfuric acid aerosol cloud, J. King, M. McCormick, M. Trepte, Polar stratospheric optical depth observed between and , J. Stone , R. Dutton, and Jeffrey R. Stone , et al. Bluth, G. Davidson, K. Overland and D.

Deshler, D. Dutton , E.

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Christy, Solar radiative forcing at selected locations and evidence for global lower tropospheric cooling following the eruptions of El Chichon and Pinatubo, Geophys, Res. Dutton, E. Fett R.

Gerber, H. Deepak Publishing, Hansen, J. Harris, J.

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