Scattering matrices of martian dust analogs at 488nm and 647nm

Dabrowska, Dominika D.; Muñoz, Olga; Moreno, F.; Ramos, José Luis Martínez; Martínez‐Frías, Jesús; Wurm, Gerhard

doi:10.1016/j.icarus.2014.11.024

Cited by 28 publications

(29 citation statements)

References 66 publications

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“…This seems to indicate the presence of compact and/or aggregate dust grains with sizes ranging from sub-micron up to tens of microns. Those findings are in agreement with laboratory measurements of cosmic dust analogues (Volten et al (2006), Volten et al (2007), Laan et al (2009), Muñoz et al (2012), Dabrowska et al (2015)).…”

Section: Introductionsupporting

confidence: 91%

Experimental Phase Functions of Millimeter-sized Cosmic Dust Grains

Muñoz

Moreno

Vargas-Martı́n

et al. 2017

ApJ

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We present experimental phase functions of three types of millimeter-sized dust grains consisting of enstatite, quartz and volcanic material from Mount Etna, respectively. The three grains present similar sizes but different absorbing properties. The measurements are performed at 527 nm covering the scattering angle range from 3 to 170 degrees. The measured phase functions show two well defined regions i) soft forward peaks and ii) a continuous increase with the scattering angle at side-and back-scattering regions. This behavior at side-and back-scattering regions are in agreement with the observed phase functions for the Fomalhaut and HR 4796A dust rings. Further computations and measurements (including polarization) for millimeter sized-grains are needed to draw some conclusions about the fluffy or compact structure of the dust grains.

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Section: Introductionsupporting

confidence: 91%

Experimental Phase Functions of Millimeter-sized Cosmic Dust Grains

Muñoz

Moreno

Vargas-Martı́n

et al. 2017

ApJ

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“…Basalt, JSC0, JSC200, JSC-1A, Palagonite Muñoz et al, 2012;Dabrowska et al 2015;Escobar-Cerezo et al, 2018;Laan et al, 2009…”

Section: Samplesmentioning

confidence: 99%

Characterisation of Martian dust aerosol phase function from sky radiance measurements by MSL engineering cameras

Chen-Chen

Pérez‐Hoyos

Sánchez‐Lavega

2019

Icarus

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Dust is the main driver of Mars' atmospheric variability. The determination of Martian dust aerosol properties is of high relevance for radiative modelling and calculating its weather forcing. In particular, the light scattering behaviour at intermediate and large scattering angles can provide valuable information regarding the airborne dust particle shape. The angular distribution of sky brightness observed by the Mars Science Laboratory engineering cameras (Navcam and Hazcam) is used here to characterise the atmospheric dust single scattering phase function and to constrain the shape of the particles. An iterative radiative transfer based retrieval method was implemented in order to determine the aerosol modelling parameters which best reproduce the observed sky radiance as a function of the scattering angle in the solar almucantar plane. The aerosol models considered in this study for retrieving dust radiative properties were an analytical three term Double Henyey-Greenstein (DHG) phase function, T-matrix calculations for cylindrical particles with different diameter-to-length (D/L) aspect ratios and experimental phase functions from laboratory measurements of several Martian dust analogue samples. Results of this study returned mean DHG phase function parameter values g 1 = 0.889±0.098, g 2 = 0.094±0.250, α = 0.743±0.106; generating a phase function with an asymmetry parameter of g = 0.673±0.081 (in line with Wolff et al., 2009). Although differences were observed during the low opacity aphelion season (lower forward scattering values, presence of a peak in the backward region) compared to the rest of the year, no clear evidences of seasonal behaviour or interannual variability were derived. The obtained average D/L aspect ratios for T-matrix calculated cylindrical particles were 0.70±0.20 and 1. 90±0.20 (similar to Wolff et al., 2001), and the best fitting Martian dust analogue corresponded to the basalt sample (in agreement with Dabrowska et al., 2015).

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“…The relative phase function, F 11 ( θ )/ F 11 (10°) is obtained (Dabrowska et al, ; Volten, Muñoz, Hovenier, et al, ):

\frac{F_{11} ((), θ)}{F_{11} (() 10 °)} = \frac{F_{11}^{au} ((), θ)}{F_{11}^{au} (() 10 °)}

where

F_{11}^{au} ((), θ)

is the auxiliary phase function, which is normalized so that its average over all directions equals unity, that is,

\frac{1}{2} \int_{0}^{π} italicdθ sin θ F_{11}^{au} ((), θ) = 1

…”

Section: Resultsmentioning

confidence: 99%

“…The ratio F 34 (θ)/F 11 (θ) is close to 0 at forward and back scattering angles, with a maximum observed at side scattering angles. For scattering angles smaller than 50°, the values of F 34 (θ)/F 11 (θ) are negative; furthermore, it is very possible that there is another negative branch at near back scattering, according to Dabrowska et al (2015).…”

Section: Measured Scattering Matrix For Cement Dustmentioning

confidence: 99%

“…Muñoz et al (2010) built an improved apparatus at the Insituto de Astrofísica de Andalucía Cosmic Dust Laboratory in Granada. Samples of clays, Martian analogs, and new volcanic ash were measured at wavelengths of 448 and 647 nm; a more complete database including the original one was provided (Dabrowska et al, 2013(Dabrowska et al, , 2015Merikallio et al, 2015;Muñoz et al, , 2012. Zhang et al (2010Zhang et al ( , 2011 built a similar platform to study smoke generated by different fuels under various burning conditions.…”

Section: Introductionmentioning

confidence: 99%

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Scattering Matrix for Typical Urban Anthropogenic Origin Cement Dust and Discrimination of Representative Atmospheric Particulates

Liu

Zhang

et al. 2018

JGR Atmospheres

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The complete scattering matrix for cement dust was measured as a function of scattering angle from 5° to 160° at a wavelength of 532 nm, as a representative of mineral dust of anthropogenic origin in urban areas. Other related characteristics of cement dust, such as particle size distribution, chemical composition, refractive index, and micromorphology, were also analyzed. For this objective, a newly improved apparatus was built and calibrated using water droplets. Measurements of water droplets were in good agreement with Lorenz‐Mie calculations. To facilitate the direct applicability of measurements for cement dust in radiative transfer calculation, the synthetic scattering matrix was computed and defined over the full scattering angle range from 0° to 180°. The scattering matrices for cement dust and typical natural mineral dusts were found to be similar in trends and angular behaviors. Angular distributions of all matrix elements were confined to rather limited domains. To promote the application of light‐scattering matrix in atmospheric observation and remote sensing, discrimination methods for various atmospheric particulates (cement dust, soot, smolder smoke, and water droplets) based on the angular distributions of their scattering matrix elements are discussed. The ratio −F12/F11 proved to be the most effective discrimination method when a single matrix element is employed; aerosol identification can be achieved based on −F12/F11 values at 90° and 160°. Meanwhile, the combinations of −F12/F11 with F22/F11 (or (F11 − F22)/(F11 + F22)) or −F12/F11 with F44/F11 at 160° can be used when multiple matrix elements at the same scattering angle are selected.

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Scattering matrices of martian dust analogs at 488nm and 647nm

Cited by 28 publications

References 66 publications

Experimental Phase Functions of Millimeter-sized Cosmic Dust Grains

Experimental Phase Functions of Millimeter-sized Cosmic Dust Grains

Characterisation of Martian dust aerosol phase function from sky radiance measurements by MSL engineering cameras

Scattering Matrix for Typical Urban Anthropogenic Origin Cement Dust and Discrimination of Representative Atmospheric Particulates

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