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Perturbations of the Optical Properties of Mineral Dust Particles by Mixing with Black Carbon: a Numerical Simulation Study : Volume 15, Issue 2 (27/01/2015)

By Scarnato, B. V.

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Book Id: WPLBN0003997077
Format Type: PDF Article :
File Size: Pages 47
Reproduction Date: 2015

Title: Perturbations of the Optical Properties of Mineral Dust Particles by Mixing with Black Carbon: a Numerical Simulation Study : Volume 15, Issue 2 (27/01/2015)  
Author: Scarnato, B. V.
Volume: Vol. 15, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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China, S., Mazzoleni, C., Nielsen, K., & Scarnato, B. V. (2015). Perturbations of the Optical Properties of Mineral Dust Particles by Mixing with Black Carbon: a Numerical Simulation Study : Volume 15, Issue 2 (27/01/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: Naval Postgraduate School, 589 Dyer Road, Root Hall, Monterey, CA 93943-5114, USA. Field observations show that individual aerosol particles are a complex mixture of a wide variety of species, reflecting different sources and physico-chemical transformations. The impacts of individual aerosol morphology and mixing characteristics on the Earth system are not yet fully understood. Here we present a sensitivity study on climate relevant aerosols' optical properties to various approximations. Based on aerosol samples collected in various geographical locations, we have observationally constrained size, morphology and mixing, and accordingly simulated, using the discrete dipole approximation model (DDSCAT), optical properties of 3 aerosols types: (1) bare black carbon (BC) aggregates, (2) bare mineral dust, and (3) an internal mixture of a BC aggregate laying on top of a mineral dust particle, also referred as polluted dust.

DDSCAT predicts optical properties and their spectral dependence consistently with observations for all the studied cases. Predicted values of mass absorption, scattering and extinction coefficients (MAC, MSC, MEC) for bare BC show a weak dependence on the BC aggregate size, while the asymmetry parameter (g) shows the opposites. The simulated optical properties of bare mineral dust present a large variability depending on the modeled dust shape, confirming the limited range of applicability of spheroids over different types and size of mineral dust aerosols, in agreement with previous modeling studies. The polluted dust cases show a strong decrease in MAC values with the increase in dust particle size (for the same BC size), while an increase of the single scattering albedo (SSA). Further, polluted dust particles with radius between 180–300 nm are characterized by a decrease in SSA values compared to bare dust, in agreement with field observations.

This paper demonstrates that observationally constrained DDSCAT simulations allow to better understand the variability of the measured aerosol optical properties in ambient air, and to define benchmarks biases due to different approximations in aerosol parametrization.


Summary
Perturbations of the optical properties of mineral dust particles by mixing with black carbon: a numerical simulation study

Excerpt
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