The Advanced Navy Aerosol Model (ANAM): validation of small-particle modes

Eijk, Alexander M. J. van; Kuśmierczyk-Michulec, Jolanta; Piazzola, Jacques

doi:10.1117/12.896178

Cited by 13 publications

(16 citation statements)

References 15 publications

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“…(3) on scattering angle θ is almost completely due to the scattering function βζ, which is typically a strongly decreasing function of angle for arguments less than ∼90°. Models of aerosol composition and volume scattering for various weather conditions and geography have been developed [7], but the details of the scattering function will not generally be known. However, if the ratio of the radiance at cameras 1 and 2 is taken with the appropriate angular offsets, the magnitude of the scattering functions will be equal and cancel:…”

Section: Theorymentioning

confidence: 99%

Off-axis laser beam imaging and characterization with two cameras

Hanson¹,

Bendall

2013

Appl. Opt.

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Off-axis scattering of laser beams propagating in the atmosphere has been imaged by two separated cameras. We give a theoretical analysis and report experiments that show how these images can be used to reconstruct the position and orientation of the beam relative to the cameras. The information from a single image of the beam only determines the beam within a plane. However, the intersection of these planes of ambiguity using images from two cameras can determine the beam uniquely. When the two planes are nearly parallel, an independent method based on the relative radiance at each camera can be used to determine the beam direction.

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Section: Theorymentioning

confidence: 99%

Off-axis laser beam imaging and characterization with two cameras

Hanson¹,

Bendall

2013

Appl. Opt.

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“…The aerosols are typically modeled as spherical particles, so that their interaction with the laser beam can be described by the Mie scattering theory [9,17]. This seems to capture well experimental observations [3,18,11].…”

mentioning

confidence: 93%

“…These sensors measure the intensity of incoherent light scattered by a cloud of particles suspended in air (aerosols), with sizes ranging from a few nanometers to a hundred micrometers [12]. Maritime environments have a mixture of aerosols like sea salts, dust particles, water droplets, etc., with concentration and composition of the cloud depending on factors such as weather and location [11,18]. The aerosols are typically modeled as spherical particles, so that their interaction with the laser beam can be described by the Mie scattering theory [9,17].…”

mentioning

confidence: 99%

Laser Beam Imaging from the Speckle Pattern of the Off-Axis Scattered Intensity

Borcea¹,

Garnier²

2018

SIAM J. Appl. Math.

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We study the inverse problem of localization (imaging) of a laser beam from measurements of the intensity of light scattered off-axis by a Poisson cloud of small particles. Starting from the wave equation, we analyze the microscopic coherence of the scattered intensity and show that it is possible to determine the laser beam from the speckle pattern captured by a group of CCD cameras. Two groups of cameras are sufficient when the particles are either small or large with respect to the wavelength. For general particle sizes the accuracy of the laser localization with two groups of cameras is subject to knowing the scattering properties of the cloud. However, three or more groups of cameras allow accurate localization that is robust to uncertainty of the type, size, shape and concentration of the particles in the cloud. We introduce a novel laser beam localization algorithm and give some numerical illustrations in a regime relevant to the application of imaging high energy lasers in a maritime atmosphere.

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“…issued from gaseous dimethyl sulfide (DMS) released from surface waters (e.g., Bates et al, 1994). These primary and secondary marine aerosol production processes result in particles carrying widely in number and size, i.e., from less than 0.01 µm to about 500 µm (Van Eijk et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

A Study of the Influence of Atmospheric Aerosol Sources on the COVID-19 Contamination Cases Using Meteorological and Extinction Data

Piazzola

Desnues

Parent

et al. 2020

Preprint

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Background: Even if the people density, habits and displacements probably represent the most important causes of the SARS-Cov-2 virus propagation, the role of the atmospheric aerosol needs to be investigated. Therefore, we aimed to study if the aerosol properties related to the different sources and meteorological conditions we can observe in urbanized areas can have an influence on in the atmospheric transport of the SARS-Cov-2 virus. This study focuses on the lockdown period to reduce the differences in the social behavior.Methods: We have investigated the contamination cases of four specific geographic areas, two in France and two in Italy, located in both continental and coastal areas with regard to the meteorological conditions and the corresponding air mass properties. To this end, we used a survey of meteorological conditions and aerosol properties via both the optical depth (AOD) and Angstrom exponent retrievals for these locations during March 2020. Results: The results show that the analysis of aerosol ground-based data can be of interest to assess a virus survey. In particular, our data show that moderate to strong onshore winds occurring in coastal regions, which allow large sea-spray production episodes deal with smaller COVID-19 contamination rates. One possible reason is the coagulation of SARS-Cov-2 particles with hygroscopic salty sea-spray aerosols that would tend to inhibit its viral infectivity in environments with high relative humidity via possible reaction with NaCl. Conclusions: In this paper, we hypothesize that marine atmosphere conditions tend to decrease virus infectivity. In contrast, the atmospheric transport of the SARS-Cov-2 can be favored by its coagulation with anthropogenic aerosols, which protects the virus particle from ambient humidity and preserves its infectivity.

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The Advanced Navy Aerosol Model (ANAM): validation of small-particle modes

Cited by 13 publications

References 15 publications

Off-axis laser beam imaging and characterization with two cameras

Off-axis laser beam imaging and characterization with two cameras

Laser Beam Imaging from the Speckle Pattern of the Off-Axis Scattered Intensity

A Study of the Influence of Atmospheric Aerosol Sources on the COVID-19 Contamination Cases Using Meteorological and Extinction Data

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