Journal ArticleDOI
Spectral absorption coefficients and imaginary parts of refractive indices of Saharan dust during SAMUM-1
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TLDR
In this paper, the authors measured spectral absorption coefficients using a spectral optical absorption photometer (SOAP) in the wavelength range from 300 to 800 nm with a resolution of 50 nm.Abstract:
During the SAMUM-1 experiment, absorption coefficients and imaginary parts of refractive indices of mineral dust particles were investigated in southern Morocco. Main absorbing constituents of airborne samples were identified to be iron oxide and soot. Spectral absorption coefficients were measured using a spectral optical absorption photometer (SOAP) in the wavelength range from 300 to 800 nm with a resolution of 50 nm. A new method that accounts for a loading-dependent correction of fibre filter based absorption photometers, was developed. The imaginary part of the refractive index was determined using Mie calculations from 350 to 800 nm. The spectral absorption coefficient allowed a separation between dust and soot absorption. A correlation analysis showed that the dust absorption coefficient is correlated ( R 2 up to 0.55) with the particle number concentration for particle diameters larger than 0.5 μm, whereas the coefficient of determination R 2 for smaller particles is below 0.1. Refractive indices were derived for both the total aerosol and a dust aerosol that was corrected for soot absorption. Average imaginary parts of refractive indices of the entire aerosol are 7.4 × 10 -3 , 3.4 × 10 -3 and 2.0 × 10 -3 at wavelengths of 450, 550 and 650 nm. After a correction for the soot absorption, imaginary parts of refractive indices are 5.1 × 10 -3 , 1.6 × 10 -3 and 4.5 × 10 -4 . DOI: 10.1111/j.1600-0889.2008.00399.xread more
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Aerosol light absorption and its measurement: A review
TL;DR: In this paper, the authors used Mie theory for spherical particles and with more complicated numerical methods for other particle shapes to calculate aerosol light absorption in the atmosphere, which contributes to solar radiative forcing through absorption of solar radiation and heating of the absorbing aerosol layer.
Journal ArticleDOI
Light-absorbing impurities in Arctic snow
TL;DR: In this paper, the authors surveyed the Arctic snow for its content of light-absorbing impurities, expanding and updating the 1983-1984 survey of Clarke and Noone, and concluded that the reduction of snow albedo is primarily due to BC, but other impurities are typically responsible for ~40% of the visible and ultraviolet absorption.
Journal ArticleDOI
Size distribution, mass concentration, chemical and mineralogical composition and derived optical parameters of the boundary layer aerosol at Tinfou, Morocco, during SAMUM 2006
Konrad Kandler,Lothar Schütz,C. Deutscher,Martin Ebert,Heiko Hofmann,Simon Jäckel,Ruprecht Jaenicke,Peter Knippertz,K. Lieke,A. Massling,Andreas Petzold,A. Schladitz,Bernadett Weinzierl,Alfred Wiedensohler,S. Zorn,Stephan Weinbruch +15 more
TL;DR: In this paper, physical and chemical properties of desert aerosols were measured during the SAMUM 2006 field campaign in southern Morocco, and the size distributions were measured for particles with diameter between 20 nm and 500 μm.
Journal ArticleDOI
Saharan Mineral Dust Experiments SAMUM-1 and SAMUM-2 : what have we learned?
Albert Ansmann,Andreas Petzold,Konrad Kandler,Ina Tegen,Manfred Wendisch,Detlef Müller,Detlef Müller,Bernadett Weinzierl,Thomas Müller,Jost Heintzenberg +9 more
TL;DR: The Saharan Mineral Dust Experiment (SAMUM) project as discussed by the authors has been used to study the impact of Saharan dust on radiative transfer and the feedback of radiative effects upon dust emission and aerosol transport.
Journal ArticleDOI
Characterizing elemental, equivalent black, and refractory black carbon aerosol particles: a review of techniques, their limitations and uncertainties
TL;DR: This review paper is designed as a guide for those wishing to learn about the current state of black carbon measurement instrumentation, how calibration is carried out, when one instrument may have the advantage over another, and where new techniques are needed to fill important knowledge gaps.
References
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Climate Change 2007: The Physical Science Basis Summary for Policymakers:
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Optical Properties of Aerosols and Clouds: The Software Package OPAC
M. Hess,P. Koepke,I. Schult +2 more
TL;DR: In this article, the optical properties of aerosols and clouds are described, including extinction, scattering, and absorption coefficients, single scattering albedo, asymmetry parameter, and phase function.
Diffuse radiation in the Galaxy
L. G. Henyey,Jesse L. Greenstein +1 more
TL;DR: In this paper, it was shown that the observed intensity of the diffuse light may be explained as scattered radiation if the phase function governing the scattering of starlight by the interstellar matter is strongly forward-throwing.
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Diffuse radiation in the Galaxy
L. G. Henyey,Jesse L. Greenstein +1 more
TL;DR: In this article, it was shown that the observed intensity of the diffuse light may be explained as scattered radiation if the phase function governing the scattering of starlight by the interstellar matter is strongly forward-throwing.
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