Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27..963a&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 7, p. 963-966
Physics
44
Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Pollution-Urban And Regional, Global Change: Impact Phenomena, Global Change: Remote Sensing
Scientific paper
During the Intensive Field Phase (IFP) of the Indian Ocean Experiment (INDOEX) lasting from 15 February to 26 March 1999, a large number of pollution outbreaks from India and southeast Asia were observed with a unique six-wavelength aerosol lidar at Maldives International Airport, Hulule (4.1°N, 73.3°E). An example is presented here. Above the polluted marine boundary layer a 3-km deep aerosol layer was advected from the Indian subcontinent. The aerosol optical depths of the marine boundary layer and the free-troposphere layer were approximately 0.2 and 0.4 at 532 nm, respectively. Inversions using spectrally resolved particle backscatter and extinction data indicate an effective particle radius of 0.17 μm, volume and surface concentrations around 13 μm3 cm-3 and 600 μm2 cm-3, respectively, and considerable absorption by the free-tropospheric particles.
Althausen Dietrich
Ansmann Albert
Franke Kathleen
Heintzenberg Jost
Müller Detlef
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