Analysis of the Impact of Relative Humidity and Mineral Nuclei Mode Aerosols Particle Concentration on the Visibility of Desert Aerosols
Abstract
This paper presents the results of the Analysis of the Impact of relative humidity and water-soluble aerosol particle concentrations on the visibility and particle size distribution of desert aerosols based on microphysical properties of desert aerosols. The microphysical properties (the extinction coefficients, volume mix ratios, dry mode radii and wet mode radii) were extracted from Optical Properties of Aerosols and Clouds (OPAC 4.0) at eight relative humidities (00 to 99%RH) and at the spectral range of 0.4-0.8 mm. the concentrations of mineral nuclie component (MINN) were varied to obtain five different models. The angstrom exponent (a), the turbidity (b), the curvature (a2), humidification factor (g), the mean exponent of aerosol growth curve (µ) and the mean exponent of aerosol size distributions (n) were determined from the regression analysis of some standard equations. It was observed that the values of (a) are less than 1 throughout the 5 models which signifies the dominance of coarse mode particles over fine mode particles. It was observed that the curvature (a2) has both monomodal and bimodal types of distributions all through the 5 models and this signifies the dominance of coarse mode particles with some traces of fine mode particles. The visibility was observed to decrease with the increase in RH and increased with wavelength. The analysis further found that there is an inverse power law relationship between humidification factor, the mean exponent of the aerosol size distribution with the mean exponent of the aerosol growth curve (as the magnitude of (µ) decreases across the five models, the magnitudes of (g) and (n) increase, but the magnitude of both (g) and (n) increases for a given (µ) across the individual models). The mean exponent of aerosol size distribution (µ) being less than 3 indicate hazy condition of the desert atmosphere.
Keywords
Full Text:
DOWNLOAD PDFReferences
P. Zieger, R. Fierz-Schmidhauser, E. Weingartner, and U. Baltensperger, “Effects of relative humidity on aerosol light scattering : Results from different European sites†Atmos. Chem. Phys., 13, 10609–10631, 2013
D. J. Jacob, J. M. Waldman, J. W. Munger, and M. R. Hoffmann, “The H2SO4- HNO3- NH3 system at high humidities and in fogs. 2. Comparison of field data with thermodynamic calculations.,†J. Geophys. Res., vol. 91, no. D1, pp. 1089–1096, 1986
B. A. Maher, J. M. Prospero, D. Mackie, D. Gaiero, P. P. Hesse, and Y. Balkanski, “Global connections between aeolian dust, climate and ocean biogeochemistry at the present day and at the last glacial maximum,†Earth-Science Rev., vol. 99, no. 1–2, pp. 61–97, 2010
T. D. Jickells et al., “Global iron connections between desert dust, ocean biogeochemistry, and climate,†Science (80-. )., vol. 308, no. 5718, pp. 67–71, 2005
C. A. Kellogg and D. W. Griffin, “Aerobiology and the global transport of desert dust,†Trends Ecol. Evol., vol. 21, no. 11, pp. 638–644, 2006
H. Herich et al., “Water uptake of clay and desert dust aerosol particles at sub- and supersaturated water vapor conditions,†Phys. Chem. Chem. Phys., vol. 11, no. 36, pp. 7804–7809, 2009
R. T. Sataloff, M. D. Johns, and K. M. Kost, “Climate: The Influence of Aerosols on climate,†vol. 8, no. 1, pp. 451–456, 1969.
C. Camino et al., “An empirical equation to estimate mineral dust concentrations from visibility observations in Northern Africa,†Aeolian Res., vol. 16, no. July 2018, pp. 55–68, 2015
R. Lang and N. X. Xanh, “Smoluchowski’s theory of coagulation in colloids holds rigorously in the Boltzmann-Grad-limit,†Zeitschrift für Wahrscheinlichkeitstheorie und Verwandte Gebiete, vol. 54, no. 3, pp. 227–280, 1980
F. Kasten, “Visibility forecast in the phase of pre-condensation,†Tellus, vol. 21, no. 5, pp. 631–635, Jan. 1969
B. I. Tijjani, F. Sha’aibu, and A. Aliyu, “The Effect of Relative Humidity on Maritime Tropical Aerosols,†Open J. Appl. Sci., vol. 04, no. 06, pp. 299–322, 2014
P. Tsilimigras, “On the applicability of the Roothaan-Bagus procedure,†Chem. Phys. Lett., vol. 11, no. 1, pp. 99–100, 1971
R. J. Charlson, “current research,†vol. 3, no. 10, pp. 913–918, 1969.
and I. schult M. Hess, P. Koepke, “Optical Properties of Aerosols and Clouds: The Software Package OPAC,†pp. 831–844, 1998.
K. K. Moorthy, A. Saha, B. S. N. Prasad, K. Niranjan, D. Jhurry, and P. S. Pillai, “Aerosol optical depths over peninsular India and adjoining oceans during the INDOEX campaigns: Spatial, temporal, and spectral characteristics,†J. Geophys. Res. Atmos., vol. 106, no. D22, pp. 28539–28554, 2001
S. Singh, S. Nath, R. Kohli, and R. Singh, “Aerosols over Delhi during pre-monsoon months : Characteristics and effects on surface radiation forcing,†Geophys. Res. Lett., vol. 32, no. 1, pp. 4–7, 2005
E. L. Koschmieder, “Symmetric Circulations of Planetary Atmospheres,†Adv. Geophys., vol. 20, no. C, pp. 131–181, 1978
M. D. and D. M. B. King, “A method for inferring total ozone content from spectral variation of total optical depth obtained with solar radiometer.†pp. 2242–2251, 1976.
B. I. Tijjani, F. Sha’aibu, and A. Aliyu, “The Effect of Relative Humidity on Maritime Polluted Aerosols,†Open J. Appl. Sci., vol. 04, no. 06, pp. 299–322, 2014
N. T. O’Neill, O. Dubovik, and T. F. Eck, “Modified Ångström exponent for the characterization of submicrometer aerosols,†Appl. Opt., vol. 40, no. 15, p. 2368, 2001
N. T. O’Neill, T. F. Eck, A. Smirnov, B. N. Holben, and S. Thulasiraman, “Spectral discrimination of coarse and fine mode optical depth,†J. Geophys. Res. D Atmos., vol. 108, no. 17, pp. 1–15, 2003
J. Yoram Kaufman, “Aerosol Optical Thickness and Atmospheric Path Radiance,†Geophys. Res. Lett., vol. 98, no. 2, pp. 2677–2692, 1993.
T. F. Eck, B. N. Holben, A. Smirnov, I. Slutsker, J. M. Lobert, and V. Ramanathan, “Column-integrated aerosol optical properties over the Maidives during the northeast,†Geophys. Res. Lett., vol. 106, no. 22, pp. 28555–28566, 2001.
J. S. Reid, A. Smirnov, N. T. O. Neill, I. Slutsker, and S. Kinne, “Wavelength dependence of the optical depth of biomass burning, urban, and desert aerosols,†Geophys. Res., vol. 104, no. 1, pp. 31333–31349, 1999.
T. F. Eck et al., “Characterization of the optical properties of biomass burning aerosols in Zambia during the 1997 ZIBBEE field campaign,†Geophys. Res., vol. 106, no. 4, pp. 3425–3448, 2001.
B. I. Tijjani, “The Effect of Soot and Water Soluble on the Hygroscopicity of Urban Aerosols,†Adv. Phys. Theor. Appl., vol. 26, no. 1, pp. 52–73, 2013
P. K. Quinn et al., “Impact of particulate organic matter on the relative humidity dependence of light scattering: A simplified parameterization,†Geophys. Res. Lett., vol. 32, no. 22, pp. 1–4, 2005
Junge et. al., “Chapter 2 Physical and Optical properties of aerosols,†Geophys. Res. Lett., vol. 1, no. 1, pp. 220–247, 1958.
S. Sjogren, M. Gysel, E. Weingartner, U. Baltensperger, M. J. Cubison, and H. Coe, “Hygroscopic growth and water uptake kinetics of two-phase aerosol particles consisting of ammonium sulfate , adipic and humic acid mixtures,†Aerosol Sci., vol. 38, no. 1, pp. 157–171, 2007
E. Swietlicki et al., “Hygroscopic properties of submicrometer atmospheric aerosol particles measured with H-TDMA instruments in various environments - A review,†Tellus, Ser. B Chem. Phys. Meteorol., vol. 60 B, no. 3, pp. 432–469, 2008
Refbacks
- There are currently no refbacks.
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
ISSN: 2394-3688
© Science Front Publishers