Polarized light scattering by aerosols in the marine atmospheric boundary layer.

نویسندگان

  • M S Quinby-Hunt
  • L L Erskine
  • A J Hunt
چکیده

The intensity and polarization of light scattered from marine aerosols affect visibility and contrast in the marine atmospheric boundary layer (MABL). The polarization properties of scattered light in the MABL vary with size, refractive index, number distributions, and environmental conditions. Laboratory measurements were used to determine the characteristics and variability of the polarization of light scattered by aerosols similar to those in the MABL. Scattering from laboratory-generated sea-salt-containing (SSC) [NaCl, (NH(4))(2) SO(4), and seawater] components of marine aerosols was measured with a scanning polarization-modulated nephelometer. Mie theory with Gaussian and log normal size distributions of spheres was used to calculate the polarized light scattering from various aerosol composition models and from experimentally determined distributions of aerosols in the marine boundary layer. The modeling was verified by comparison with scattering from distilled water aerosols. The study suggests that polarimetric techniques can be used to enhance techniques for improving visibility and remote imaging for various aerosol types, Sun angles, and viewing conditions.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Measurements of Aerosol properties in the MABL Using Polarization Nephelometry

The long-term goal is to develop and evaluate polarization sensitive instrumentation to improve the measurement and understanding of the properties of aerosols in the Marine Atmospheric Boundary Layer (MABL). Aerosol components include sea salt containing aerosols, sulfates, continental aerosols, diesel and fire smoke. Accurate characterization of the aerosols in the MABL on a real-time basis r...

متن کامل

A Computer Modeling of Mie-Scattering by Spherical Droplets Within the Atmosphere

The Earth’s atmosphere is an environment replete with particles of differ-ent sizes with various refractive indices which affect the light radiation traveling through it. The Mie scattering theory is one of the well-known light scattering techniques ap-plicable to modeling of electromagnetic scattering from tiny atmospheric particles or aerosols floating in the air or within the clouds. In this...

متن کامل

Determination of Marine Aerosol Properties Using a Bistatic Nephelometer

Our long-term goal is to develop methods to characterize remotely the optical properties of aerosols in the marine atmospheric boundary layer (MABL). The method is based on instruments and analytic methods that use angle-dependent polarization information from the light scattered by aerosols. The information derived from these measurements will enable accurate prediction of the aerosol optical ...

متن کامل

Scattered-Field FDTD and PSTD Algorithms with CPML Absorbing Boundary Conditions for Light Scattering by Aerosols

As fundamental parameters for polarized-radiative-transfer calculations, the single-scattering phase matrix of irregularly shaped aerosol particles must be accurately modeled. In this study, a scattered-field finite-difference time-domain (FDTD) model and a scattered-field pseudospectral time-domain (PSTD) model are developed for light scattering by arbitrarily shaped dielectric aerosols. The c...

متن کامل

Kinetics, Mechanism and Product Yields in the Atmospheric Oxidation of Dimethylsulfide

Dimethylsulfide (DMS, CH3SCH3) produced by phytoplankton degredation is thought to be the major source of the sulfate and methanesulfonate aerosol found in the marine boundary layer. An understanding of the mechanism of formation of these aerosols is critical in evaluating the factors which control visibility in the marine boundary layer. The primary objective of this research effort is to dete...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Applied optics

دوره 36 21  شماره 

صفحات  -

تاریخ انتشار 1997