scholarly journals On the application of scattering matrix measurements to detection and identification of major types of airborne aerosol particles: volcanic ash, desert dust and pollen

2021 ◽  
pp. 107761
Author(s):  
Juan Carlos Gomez Martin ◽  
Daniel Guirado ◽  
Elisa Frattin ◽  
Maria Bermudez-Edo ◽  
Paloma Cariñanos Gonzalez ◽  
...  
Keyword(s):  
Volcanic Ash ◽  
Aerosol Particles ◽  
Scattering Matrix ◽  
Desert Dust ◽  
Detection And Identification

A comprehensive database of the optical properties of irregular aerosol particles for radiative transfer simulations

2021 ◽  
Author(s):  
Masanori Saito ◽  
Ping Yang ◽  
Jiachen Ding ◽  
Xu Liu
Keyword(s):  
Optical Properties ◽  
Radiative Transfer ◽  
Aerosol Particle ◽  
Volcanic Ash ◽  
Aerosol Particles ◽  
Single Scattering ◽  
Dust Aerosol ◽  
Index Of Refraction ◽  
Particle Sizes

AbstractA database (TAMUdust2020) of the optical properties of irregular aerosol particles is developed for applications to radiative transfer simulations involving aerosols, particularly dust and volcanic ash particles. The particle shape model assumes an ensemble of irregular hexahedral geometries to mimic complex aerosol particle shapes in nature. State-of-the-art light scattering computational capabilities are employed to compute the single-scattering properties of these particles for wide ranges of values of the size parameter, the index of refraction, and the degree of sphericity. The database therefore is useful for various radiative transfer applications over a broad spectral region from ultraviolet to infrared. Overall, agreement between simulations and laboratory/in-situ measurements is achieved for the scattering phase matrix and backscattering of various dust aerosol and volcanic ash particles. Radiative transfer simulations of active and passive spaceborne sensor signals for dust plumes with various aerosol optical depths and the effective particle sizes clearly demonstrate the applicability of the database for aerosol studies. In particular, the present database includes, for the first time, robust backscattering of nonspherical particles spanning the entire range of aerosol particle sizes, which shall be useful to appropriately interpret lidar signals related to the physical properties of aerosol plumes. Furthermore, thermal infrared simulations based on in-situ measured refractive indices of dust aerosol particles manifest the effects of the regional variations of aerosol optical properties. This database includes a user-friendly interface to obtain user-customized aerosol single-scattering properties with respect to spectrally dependent complex refractive index, size, and the degree of sphericity.

Glacial dust surpasses both volcanic ash and desert dust in its iron fertilization potential

2021 ◽  
Author(s):  
Bess G. Koffman ◽  
Meg F. Yoder ◽  
Taylor Methven ◽  
Lena Hanschka ◽  
Helen B. Sears ◽  
...  
Keyword(s):  
Volcanic Ash ◽  
Desert Dust ◽  
Iron Fertilization

scholarly journals Observation of volcanic ash from Puyehue–Cordón Caulle with IASI

2013 ◽  
Vol 6 (1) ◽  
pp. 35-46 ◽  
Author(s):  
L. Klüser ◽  
T. Erbertseder ◽  
J. Meyer-Arnek
Keyword(s):  
Remote Sensing ◽  
Southern Hemisphere ◽  
Volcanic Ash ◽  
Singular Vector ◽  
Air Traffic ◽  
Emission Characteristics ◽  
Desert Dust ◽  
Atmospheric Sounding ◽  
Retrieval Scheme ◽  
Ash Plume

Abstract. On 4 June 2011 an eruption of the Chilean volcano complex Puyehue–Cordón Caulle injected large amounts of volcanic ash into the atmosphere and affected local life as well as hemisphere-wide air traffic. Observations of the Infrared Atmospheric Sounding Interferometer (IASI) flown on board of the MetOp satellite have been exploited to analyze the evolution of the ash plume around the Southern Hemisphere. A novel singular vector-based retrieval methodology, originally developed for observation of desert dust over land and ocean, has been adapted to enable remote sensing of volcanic ash. Since IASI observations in the 8–12 μm window are applied in the retrieval, the method is insensitive to solar illumination and therefore yields twice the observation rate of the ash plume evolution compared to solar backscatter methods from polar orbiting satellites. The retrieval scheme, the emission characteristics and the circumpolar transport of the ash are examined by means of a source–receptor analysis.

Glacial dust surpasses both volcanic ash and desert dust in its iron fertilization potential

2020 ◽  
Author(s):  
Bess G. Koffman ◽  
Meg F Yoder ◽  
Taylor Methven ◽  
Lena Hanschka ◽  
Helen B Sears ◽  
...  
Keyword(s):  
Volcanic Ash ◽  
Desert Dust ◽  
Iron Fertilization

scholarly journals “The wrathful sunset glared…”: The Krakatoa Sunsets in Victorian Science and Art

2020 ◽  
Vol 58 ◽  
pp. 11-20
Author(s):  
Ilona Dobosiewicz
Keyword(s):  
Volcanic Ash ◽  
Aerosol Particles ◽  
Sea Waves ◽  
Science And Art ◽  
Society Report ◽  
Atmospheric Disturbances ◽  
Optical Effects ◽  
The World ◽  
Krakatoa Eruption ◽  
Victorian Science

The eruption of Krakatoa on August 27, 1883 was an event both tragic and spectacular. Thousands of lives were lost; sea waves and atmospheric disturbances were detected around the globe. Billions of tons of volcanic ash were thrown into the atmosphere producing multi-coloured sunsets caused by the scattering of light by aerosol particles. The paper discusses the ways in which these so-called Krakatoa sunsets, which were experienced by most of the world, were reflected in Victorian scientific and artistic discourse. The accounts included in the section “Descriptions of the Unusual Twilight Glows in Various Parts of the World, in 1883–84” of the Royal Society report The Eruption of Krakatoa and Subsequent Phenomena (1888), and selected poems by Alfred Tennyson, Charles Algernon Swinburne, Robert Bridges, and Mathilde Blind are analyzed to trace Victorian responses to the remarkable optical effects of the Krakatoa eruption.

Water uptake of clay and desert dust aerosol particles at sub- and supersaturated water vapor conditions

2009 ◽  
Vol 11 (36) ◽  
pp. 7804 ◽  
Author(s):  
Hanna Herich ◽  
Torsten Tritscher ◽  
Aldona Wiacek ◽  
Martin Gysel ◽  
Ernest Weingartner ◽  
...  
Keyword(s):  
Water Vapor ◽  
Water Uptake ◽  
Aerosol Particles ◽  
Dust Aerosol ◽  
Desert Dust

scholarly journals Observation of volcanic ash from Puyehue-Cordón Caulle with IASI

2012 ◽  
Vol 5 (3) ◽  
pp. 4249-4283 ◽  
Author(s):  
L. Klüser ◽  
T. Erbertseder ◽  
J. Meyer-Arnek
Keyword(s):  
Remote Sensing ◽  
Southern Hemisphere ◽  
Volcanic Ash ◽  
Singular Vector ◽  
Air Traffic ◽  
Emission Characteristics ◽  
Desert Dust ◽  
Atmospheric Sounding ◽  
Retrieval Scheme ◽  
Ash Plume

Abstract. On 4 June 2011 an eruption of the Chilean volcano complex Puyehue-Cordón Caulle injected large amounts of volcanic ash into the atmosphere and affected local life as well as hemisphere-wide air traffic. Observations of the Infrared Atmospheric Sounding Interferometer IASI flown on board of the MetOp satellite have been exploited to analyze the evolution of the ash plume around the Southern Hemisphere. A novel Singular Vector based retrieval methodology, originally developed for observation of desert dust over land and ocean, has been adapted to enable remote sensing of volcanic ash. Since IASI observations in the 8–12 μm window are applied in the retrieval, the method is insensitive to solar illumination and therefore yields twice the observation rate of the ash plume evolution compared to solar backscatter methods from polar orbiting satellites. The retrieval scheme, the emission characteristics and the circumpolar transport of the ash are examined by means of a source-receptor analysis.

scholarly journals Retrieving simulated volcanic, desert dust and sea-salt particle properties from two/three-component particle mixtures using UV-VIS polarization lidar and T matrix

2013 ◽  
Vol 13 (14) ◽  
pp. 6757-6776 ◽  
Author(s):  
G. David ◽  
B. Thomas ◽  
T. Nousiainen ◽  
A. Miffre ◽  
P. Rairoux
Keyword(s):  
Volcanic Ash ◽  
Sea Salt ◽  
Water Soluble ◽  
Nonspherical Particles ◽  
Depolarization Ratio ◽  
Component Mixture ◽  
Desert Dust ◽  
Two Component ◽  
T Matrix ◽  
Component Particle

Abstract. During transport by advection, atmospheric nonspherical particles, such as volcanic ash, desert dust or sea-salt particles experience several chemical and physical processes, leading to a complex vertical atmospheric layering at remote sites where intrusion episodes occur. In this paper, a new methodology is proposed to analyse this complex vertical layering in the case of a two/three-component particle external mixtures. This methodology relies on an analysis of the spectral and polarization properties of the light backscattered by atmospheric particles. It is based on combining a sensitive and accurate UV-VIS polarization lidar experiment with T-matrix numerical simulations and air mass back trajectories. The Lyon UV-VIS polarization lidar is used to efficiently partition the particle mixture into its nonspherical components, while the T-matrix method is used for simulating the backscattering and depolarization properties of nonspherical volcanic ash, desert dust and sea-salt particles. It is shown that the particle mixtures' depolarization ratio δ p differs from the nonspherical particles' depolarization ratio δns due to the presence of spherical particles in the mixture. Hence, after identifying a tracer for nonspherical particles, particle backscattering coefficients specific to each nonspherical component can be retrieved in a two-component external mixture. For three-component mixtures, the spectral properties of light must in addition be exploited by using a dual-wavelength polarization lidar. Hence, for the first time, in a three-component external mixture, the nonsphericity of each particle is taken into account in a so-called 2β + 2δ formalism. Applications of this new methodology are then demonstrated in two case studies carried out in Lyon, France, related to the mixing of Eyjafjallajökull volcanic ash with sulfate particles (case of a two-component mixture) and to the mixing of dust with sea-salt and water-soluble particles (case of a three-component mixture). This new methodology, which is able to provide separate vertical profiles of backscattering coefficient for mixed atmospheric dust, sea-salt and water-soluble particles, may be useful for accurate radiative forcing assessments.

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