Physics
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3314819h&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 14, CiteID L14819
Physics
1
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Radiation: Transmission And Scattering, Global Change: Atmosphere (0315, 0325), Global Change: Remote Sensing (1855)
Scientific paper
Aerosol optical thickness (AOT) measurements at two remote Pacific Ocean locations in the northern hemisphere reveal an absolute minimum in the solar spectrum of magnitude ~0.02 at 550 nm and an Ångström exponent of about 1. Along with similar results from measurements at continental sites reported previously, this minimum indicates the presence of background aerosol at both continental and marine sites. A measure of marine boundary layer AOT is obtained by taking the difference between values measured at sea-level and at altitude on Mauna Loa, Hawaii. This then is compared with AOT calculated by a Lagrangian boundary-layer microphysical aerosol model using sea-salt and sulfate aerosols and with meteorology input from a mesoscale model to provide estimates of the sea salt flux that are within a factor of 7 of a hybrid Monahan-Smith formulation.
Caffrey Peter F.
Halthore Rangasayi N.
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