Retrieval of optical depth and particle size distribution oftropospheric and stratospheric aerosols by means of Sun photometry
Schmid, B.
Matzler, C.
Heimo, A.
Kampfer, N.
Inst. of Appl. Phys., Bern Univ.;
This paper appears in: Geoscience and Remote Sensing, IEEE Transactions on
Publication Date: Jan 1997
Volume: 35,
Issue: 1
On page(s): 172-182
ISSN: 0196-2892
References Cited: 36
CODEN: IGRSD2
INSPEC Accession Number: 5504220
Digital Object Identifier: 10.1109/36.551945
Current Version Published: 2002-08-06
Abstract
Aerosol optical depth measurements by means of ground-based Sun
photometry were made in Bern, Switzerland during two and a half years
primarily to provide quantitative corrections for atmospheric effects in
remotely sensed data in the visible and near-infrared spectral region.
An investigation of the spatial variability of tropospheric aerosol was
accomplished in the summer of 1994 in the Swiss Central Plain, a region
often covered by a thick aerosol layer. Intercomparisons are made with
two Sun photometers operated by the Swiss Meteorological Institute in
Payerne (Swiss Central Plain) and Davos (Swiss Alps, 1590 m a.s.l.). By
means of an inversion technique, columnar particle size distributions
were derived from the aerosol optical depth spectra. Effective radius,
columnar surface area, and columnar mass were computed from the
inversion results. Most of the spectra measured in Bern exhibit an
Angstrom-law dependence. Consequently, the inverted size distributions
are very close to power-law distributions. Data collected during a four
month calibration campaign in fall 1993 at a high-mountain station in
the Swiss Alps (Jungfraujoch, 3580 m) allowed the authors to study
optical properties of stratospheric aerosol. The extinction spectra
measured have shown to be still strongly influenced by remaining aerosol
of the June 1991 volcanic eruptions of Mount Pinatubo. Inverted particle
size distributions can be characterized by a broad monodisperse peak
with a mode radius around 0.25 μm. Both aerosol optical depths and
effective radii had not yet returned to pre-eruption values. Comparison
of retrieved aerosol optical depth, columnar surface area and mass, with
the values derived from lidar observations performed in
Garmisch-Partenkirchen, Southern-Germany, yielded good agreement
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