1174 The Effect of Humidity on Aerosol Particles

Wednesday, 10 January 2018
Exhibit Hall 3 (ACC) (Austin, Texas)
Miguel Cortez Jr., Univ. of Texas at El Paso, El Paso, TX

The Effect of Humidity on Aerosol Particles

Miguel Cortez, Rosa M. Fitzgerald and Vernon Morris

Light scattering from aerosol particles plays a vital role in air quality, air traffic, and climatology studies. In this research work we inter-compare the scattering coefficients of particles coated with a shell of water using numerical models, against corresponding available experimental data. In addition, the obtained numerical scattering coefficients for the city of El Paso will be inter-compared against experimental scattering coefficients obtained with an extinctiometer located in the city of El Paso. Computational models use Mie theory for particles that exhibit a spherical geometry. Under the presence of atmospheric humidity above 40%, irregularly shaped hygroscopic aerosol particles are assumed to develop a water shell and form a spherical shape. Below the 40% humidity limit, particles may accumulate a thin water shell while retaining their irregular shape. The percentage humidity necessary for a particle to transition from an irregularly shaped particle to a spherical shape, after developing a water shell, will be investigated using numerical models.

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