Can we predict aerosol extinction in a coastal environment
2007
We have been engaged in a long-term test to determine the beam extinction effects of aerosols. During four test periods
of one month duration each, we propagated a beam over a 7-km path near the ocean surface, and measured the received
intensity in two near-infrared wavebands (1.061 μm and at 1.622 μm). In each test period, meteorological
measurements were obtained from a meteorological buoy located at the mid-point of the propagation path. These
meteorological data were used as input for the Advanced Navy Aerosol Model (ANAM). In this paper we will describe
the comparison between the ANAM predictions and the measured transmission. We found that there are significant and
sustained discrepancies between the ANAM model predictions and the optical transmission data. We will focus on two
particular problems that have emerged from our comparison: first, the ANAM dependence on local wind speed can
cause errors, and second, the local relative humidity is not optimally coupled in the ANAM. We will present the
analysis we used to support these claims, and we will present recommendations for modifications to the model.
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