TITLE:
The Effect of Hygroscopic Growth on Continental Aerosols
AUTHORS:
Bello Idrith Tijjani, Aliyu Aliyu, Fatima Shuaibu
KEYWORDS:
Microphysical Properties; Optical Properties; Hygroscopic Growth; Parametrization; Enhancement Parameters; Angstrom Coefficients
JOURNAL NAME:
Open Journal of Applied Sciences,
Vol.3 No.6,
October
16,
2013
ABSTRACT: In this paper, the
authors investigated some microphysical and optical properties of continental clean
aerosols from OPAC to determine the effect of hygroscopic growth at the
spectral range of 0.25 μm to 2.5 μm and eight relative humidities (RHs) (0%, 50%, 70%, 80%, 90%, 95%,
98% and 99%). The
microphysical properties extracted were radii, volume mix ratio, number mix
ratio and mass mix ratio as a function of RH while the optical properties are
scattering and absorption coefficients and asymmetric parameters. Using the
microphysical properties, growth factors of the mixtures were determined while using optical
properties the enhancement parameters were determined and then parameterized
using some models. We observed that the data fitted the models very well. The
angstrom coefficients show that the mixture has bimodal type of distribution
with the dominance of fine mode particles.