The Experts below are selected from a list of 20043 Experts worldwide ranked by ideXlab platform
Patrick Rairoux - One of the best experts on this subject based on the ideXlab platform.
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retrieving simulated volcanic desert dust and sea Salt Particle properties from two three component Particle mixtures using uv vis polarization lidar and t matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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 δ ns 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 Eyjafjallajokull 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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Retrieving volcanic, desert dust, and sea-Salt Particle properties from two/three-component Particle mixtures after long-range transport using UV-VIS polarization Lidar and T-matrix
Atmospheric Chemistry and Physics Discussions, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract:Abstract. During transport by advection, atmospheric nonspherical Particles, such as volcanic, 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 contribution, a new methodology is proposed to analyze this complex vertical layering in the case of a two/three-component Particle external mixtures after long-range transport. This methodology relies on a precise 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 accurate 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 algorithm is used for computing backscattering and depolarization properties specific to nonspherical volcanic, desert dust and sea-Salt Particles, the latter being described in the cubic shape approximation. It is shown that, after long-range transport, the Particle mixtures' depolarization ratio δp 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 addressed 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 sulphate 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 mixed atmospheric dust, sea-Salt and water-soluble Particles, may be useful for accurate radiative forcing assessments.
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Retrieving simulated volcanic, desert dust and sea-Salt Particle properties from two/three-component Particle mixtures using UV-VIS polarization lidar and T matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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.
G. David - One of the best experts on this subject based on the ideXlab platform.
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retrieving simulated volcanic desert dust and sea Salt Particle properties from two three component Particle mixtures using uv vis polarization lidar and t matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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 δ ns 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 Eyjafjallajokull 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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Retrieving volcanic, desert dust, and sea-Salt Particle properties from two/three-component Particle mixtures after long-range transport using UV-VIS polarization Lidar and T-matrix
Atmospheric Chemistry and Physics Discussions, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract:Abstract. During transport by advection, atmospheric nonspherical Particles, such as volcanic, 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 contribution, a new methodology is proposed to analyze this complex vertical layering in the case of a two/three-component Particle external mixtures after long-range transport. This methodology relies on a precise 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 accurate 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 algorithm is used for computing backscattering and depolarization properties specific to nonspherical volcanic, desert dust and sea-Salt Particles, the latter being described in the cubic shape approximation. It is shown that, after long-range transport, the Particle mixtures' depolarization ratio δp 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 addressed 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 sulphate 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 mixed atmospheric dust, sea-Salt and water-soluble Particles, may be useful for accurate radiative forcing assessments.
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Retrieving simulated volcanic, desert dust and sea-Salt Particle properties from two/three-component Particle mixtures using UV-VIS polarization lidar and T matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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.
Timo Nousiainen - One of the best experts on this subject based on the ideXlab platform.
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retrieving simulated volcanic desert dust and sea Salt Particle properties from two three component Particle mixtures using uv vis polarization lidar and t matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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 δ ns 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 Eyjafjallajokull 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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Retrieving volcanic, desert dust, and sea-Salt Particle properties from two/three-component Particle mixtures after long-range transport using UV-VIS polarization Lidar and T-matrix
Atmospheric Chemistry and Physics Discussions, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract:Abstract. During transport by advection, atmospheric nonspherical Particles, such as volcanic, 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 contribution, a new methodology is proposed to analyze this complex vertical layering in the case of a two/three-component Particle external mixtures after long-range transport. This methodology relies on a precise 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 accurate 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 algorithm is used for computing backscattering and depolarization properties specific to nonspherical volcanic, desert dust and sea-Salt Particles, the latter being described in the cubic shape approximation. It is shown that, after long-range transport, the Particle mixtures' depolarization ratio δp 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 addressed 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 sulphate 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 mixed atmospheric dust, sea-Salt and water-soluble Particles, may be useful for accurate radiative forcing assessments.
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Retrieving simulated volcanic, desert dust and sea-Salt Particle properties from two/three-component Particle mixtures using UV-VIS polarization lidar and T matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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.
Alain Miffre - One of the best experts on this subject based on the ideXlab platform.
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retrieving simulated volcanic desert dust and sea Salt Particle properties from two three component Particle mixtures using uv vis polarization lidar and t matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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 δ ns 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 Eyjafjallajokull 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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Retrieving volcanic, desert dust, and sea-Salt Particle properties from two/three-component Particle mixtures after long-range transport using UV-VIS polarization Lidar and T-matrix
Atmospheric Chemistry and Physics Discussions, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract:Abstract. During transport by advection, atmospheric nonspherical Particles, such as volcanic, 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 contribution, a new methodology is proposed to analyze this complex vertical layering in the case of a two/three-component Particle external mixtures after long-range transport. This methodology relies on a precise 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 accurate 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 algorithm is used for computing backscattering and depolarization properties specific to nonspherical volcanic, desert dust and sea-Salt Particles, the latter being described in the cubic shape approximation. It is shown that, after long-range transport, the Particle mixtures' depolarization ratio δp 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 addressed 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 sulphate 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 mixed atmospheric dust, sea-Salt and water-soluble Particles, may be useful for accurate radiative forcing assessments.
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Retrieving simulated volcanic, desert dust and sea-Salt Particle properties from two/three-component Particle mixtures using UV-VIS polarization lidar and T matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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.
B. Thomas - One of the best experts on this subject based on the ideXlab platform.
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retrieving simulated volcanic desert dust and sea Salt Particle properties from two three component Particle mixtures using uv vis polarization lidar and t matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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 δ ns 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 Eyjafjallajokull 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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Retrieving volcanic, desert dust, and sea-Salt Particle properties from two/three-component Particle mixtures after long-range transport using UV-VIS polarization Lidar and T-matrix
Atmospheric Chemistry and Physics Discussions, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract:Abstract. During transport by advection, atmospheric nonspherical Particles, such as volcanic, 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 contribution, a new methodology is proposed to analyze this complex vertical layering in the case of a two/three-component Particle external mixtures after long-range transport. This methodology relies on a precise 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 accurate 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 algorithm is used for computing backscattering and depolarization properties specific to nonspherical volcanic, desert dust and sea-Salt Particles, the latter being described in the cubic shape approximation. It is shown that, after long-range transport, the Particle mixtures' depolarization ratio δp 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 addressed 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 sulphate 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 mixed atmospheric dust, sea-Salt and water-soluble Particles, may be useful for accurate radiative forcing assessments.
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Retrieving simulated volcanic, desert dust and sea-Salt Particle properties from two/three-component Particle mixtures using UV-VIS polarization lidar and T matrix
Atmospheric Chemistry and Physics, 2013Co-Authors: G. David, Alain Miffre, B. Thomas, Timo Nousiainen, Patrick RairouxAbstract: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.
