Estimation of Aerosol Microphysical Parameters From Visible and Infrared Extinction Measurements at MAPTIP

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Authors
  1. Hutt, D.L.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
We show that an effective scattering radius r sigma and aerosol extinction coefficient at a wave-length of 3.8 mu m, alpha e (3.8 mu m), can be estimated from the simultaneous measurement of visible and 10.6 mu m extinction in haze and fog. For fog, functions relating r sigma and alpha e (3.8 mu m) to the ratio of 10.6 mu m to 0.55 mu m extinction were derived based on accepted size distribution models for clouds and fog. For haze, functions for r sigma and alpha e (3.8 mu m) were based on an analysis of measured aerosol size distributions. We compare values of r sigma and alpha e (3.8 mu m) derived from measurements of local visible and 10.6 mu m aerosol extinction to values obtained from aerosol size spectra at the NATO Panel 4 MAPTIP trial held off the Dutch coast in 1993. We conclude that measurements of visible and 10.6 mu m aerosol extinction can provide useful additional information about the aerosols.
Keywords
Extinction coefficient;Aerosol size distribution;Scattering coefficient
Report Number
DREV-TM-9615 — Technical Memorandum
Date of publication
01 Jul 1999
Number of Pages
36
DSTKIM No
99-01709
CANDIS No
511544
Format(s):
Hardcopy;Document Image stored on Optical Disk

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