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01:31 Copernicus Publications Silent film 2019

Simulation of ice-wedge degradation under intermediate hydrological conditions

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
01:31 Copernicus Publications Silent film 2019

Simulation of ice-wedge degradation under draining hydrological conditions

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
01:02 Copernicus Publications English 2019

Simulation of the 1958 Lituya Bay mega-tsunami

TS2The 1958 Lituya Bay landslide-generated mega-tsunami is simulated using the Landslide-HySEA model, a recently developed finite-volume Savage–Hutter shallow water coupled numerical model. Two factors are cru- 5 cial if the main objective of the numerical simulation is to reproduce the maximal run-up with an accurate simulation of the inundated area and a precise recreation of the known trimline of the 1958 mega-tsunami of Lituya Bay: first, the accurate reconstruction of the initial slide and then the choice 10 of a suitable coupled landslide–fluid model able to reproduce how the energy released by the landslide is transmitted to the water and then propagated. Given the numerical model, the choice of parameters appears to be a point of major importance, which leads us to perform a sensitivity analysis. 15 Based on public domain topo-bathymetric data, and on information extracted from the work of Miller (1960), an approximation of Gilbert Inlet topo-bathymetry was set up and used for the numerical simulation of the mega-event. Once optimal model parameters were set, comparisons with ob20 servational data were performed in order to validate the numerical results. In the present work, we demonstrate that a shallow water type of model is able to accurately reproduce such an extreme event as the Lituya Bay mega-tsunami. The resulting numerical simulation is one of the first successful 25 attempts (if not the first) at numerically reproducing, in detail, the main features of this event in a realistic 3-D basin geometry, where no smoothing or other stabilizing factors in the bathymetric data are applied.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: English
00:38 Copernicus Publications Silent film 2019

Disc radius 37.5 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Disc radius 50 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Disc radius 400 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Disc radius 200 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Disc radius 100 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Capped column 200×150 µm (bar 100×50 µm)

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Capped column 150×250 µm (bar 50×50 µm)

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Capped column 75×125 µm (bar 25×25 µm)

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Capped column 100×75 µm (bar 50×25 µm)

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Column 25×100 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:39 Copernicus Publications English 2019

Monochromatic waves drifting against the wind

Polar mesospheric summer echoes (PMSEs) are very strong radar echoes caused by the presence of ice particles, turbulence, and free electrons in the mesosphere over polar regions. For more than three decades, PMSEs have been used as natural tracers of the complicated atmospheric dynamics of this region. Neutral winds and turbulence parameters have been obtained assuming PMSE horizontal homogeneity in scales of tens of kilometers. Recent radar imaging studies have shown that PMSEs are not homogeneous in these scales and instead they are composed of kilometer-scale structures. In this paper, we present a technique that allows PMSE observations with unprecedented angular resolution (∼ 0.6◦). The technique combines the concept of coherent MIMO (Multi-input multiple-output) and two high-resolution imaging techniques, i.e., Capon and Maximum Entropy (MaxEnt). The resulting resolution is evaluated by imaging specular meteor echoes. The gain in angular resolution compared to previous approaches using SIMO (single-input and multiple-output) and Capon is at least a factor of 2, i.e., at 85 km, we obtain a horizontal resolution of ∼ 900 meters. The advantage of the new technique is evaluated with two events of three-dimensional PMSE structures showing: (1) horizontal wavelengths of 8-10 km and periods of 4-7 minutes, drifting with the background wind, and (2) horizontal wavelengths of 12-16 km and periods of 15-20 minutes not drifting with the background wind. Besides the advantages of the implemented technique, we discuss its current challenges, like the use of reduced power-aperture and processing time, as well as the future opportunities for improving the understanding of the complex small-scale atmospheric dynamics behind PMSEs.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: English
00:47 Copernicus Publications English 2019

Monochromatic waves drifting with the wind

Polar mesospheric summer echoes (PMSEs) are very strong radar echoes caused by the presence of ice particles, turbulence, and free electrons in the mesosphere over polar regions. For more than three decades, PMSEs have been used as natural tracers of the complicated atmospheric dynamics of this region. Neutral winds and turbulence parameters have been obtained assuming PMSE horizontal homogeneity in scales of tens of kilometers. Recent radar imaging studies have shown that PMSEs are not homogeneous in these scales and instead they are composed of kilometer-scale structures. In this paper, we present a technique that allows PMSE observations with unprecedented angular resolution (∼ 0.6◦). The technique combines the concept of coherent MIMO (Multi-input multiple-output) and two high-resolution imaging techniques, i.e., Capon and Maximum Entropy (MaxEnt). The resulting resolution is evaluated by imaging specular meteor echoes. The gain in angular resolution compared to previous approaches using SIMO (single-input and multiple-output) and Capon is at least a factor of 2, i.e., at 85 km, we obtain a horizontal resolution of ∼ 900 meters. The advantage of the new technique is evaluated with two events of three-dimensional PMSE structures showing: (1) horizontal wavelengths of 8-10 km and periods of 4-7 minutes, drifting with the background wind, and (2) horizontal wavelengths of 12-16 km and periods of 15-20 minutes not drifting with the background wind. Besides the advantages of the implemented technique, we discuss its current challenges, like the use of reduced power-aperture and processing time, as well as the future opportunities for improving the understanding of the complex small-scale atmospheric dynamics behind PMSEs.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: English
00:38 Copernicus Publications English 2019

Monochromatic waves drifting against the wind

Polar mesospheric summer echoes (PMSEs) are very strong radar echoes caused by the presence of ice particles, turbulence, and free electrons in the mesosphere over polar regions. For more than three decades, PMSEs have been used as natural tracers of the complicated atmospheric dynamics of this region. Neutral winds and turbulence parameters have been obtained assuming PMSE horizontal homogeneity in scales of tens of kilometers. Recent radar imaging studies have shown that PMSEs are not homogeneous in these scales and instead they are composed of kilometer-scale structures. In this paper, we present a technique that allows PMSE observations with unprecedented angular resolution (∼ 0.6◦). The technique combines the concept of coherent MIMO (Multi-input multiple-output) and two high-resolution imaging techniques, i.e., Capon and Maximum Entropy (MaxEnt). The resulting resolution is evaluated by imaging specular meteor echoes. The gain in angular resolution compared to previous approaches using SIMO (single-input and multiple-output) and Capon is at least a factor of 2, i.e., at 85 km, we obtain a horizontal resolution of ∼ 900 meters. The advantage of the new technique is evaluated with two events of three-dimensional PMSE structures showing: (1) horizontal wavelengths of 8-10 km and periods of 4-7 minutes, drifting with the background wind, and (2) horizontal wavelengths of 12-16 km and periods of 15-20 minutes not drifting with the background wind. Besides the advantages of the implemented technique, we discuss its current challenges, like the use of reduced power-aperture and processing time, as well as the future opportunities for improving the understanding of the complex small-scale atmospheric dynamics behind PMSEs.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: English
00:17 Copernicus Publications Silent film 2019

An SNR-optimized Scanning Strategy for GeoCarb - Summer Solstice

Jeffrey Nivitanont, Sean Crowell, and Berrien Moore. An SNR-Optimized Scanning Strategy for the Geostationary Carbon Cycle Observatory (GeoCarb) Instrument. Atmospheric Measurement Techniques.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:18 Copernicus Publications Silent film 2019

An SNR-optimized Scanning Strategy for GeoCarb - Autumn Equinox

Jeffrey Nivitanont, Sean Crowell, and Berrien Moore. An SNR-Optimized Scanning Strategy for the Geostationary Carbon Cycle Observatory (GeoCarb) Instrument. Atmospheric Measurement Techniques.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:23 Copernicus Publications Silent film 2019

Morphodynamics of GSD2 under low flow and high sediment feed rates

Paper Title: Stabilising Large Grains in Aggrading Steep Channels Journal: Earth Surface Dynamics
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:19 Copernicus Publications Silent film 2019

Morphodynamics of GSD1 under low flow and high sediment feed rates

Paper Title: Stabilising Large Grains in Aggrading Steep Channels Journal: Earth Surface Dynamics
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:21 Copernicus Publications Silent film 2019

Morphodynamics of GSD2 under high flow and sediment feed rates

Paper Title: Stabilising Large Grains in Aggrading Steep Channels Journal: Earth Surface Dynamics
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:23 Copernicus Publications Silent film 2019

Morphodynamics of GSD1 under high flow and sediment feed rates

Paper Title: Stabilising Large Grains in Aggrading Steep Channels
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Disc radius 25 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:24 Copernicus Publications Silent film 2019

Animation of IASI SO2 column amount and altitude observations of the Holuhraun volcanic cloud dispersal in September and October 2014

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:10 Copernicus Publications Silent film 2019

Animation of OMPS SO2 satellite observations of the Holuhraun volcanic cloud dispersal in September and October 2014

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
02:41 Copernicus Publications Silent film 2019

bifurcation exp 2

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
04:33 Copernicus Publications Silent film 2019

bifurcation exp 4

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
02:05 Copernicus Publications Silent film 2019

bifurcation exp 3

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:44 Copernicus Publications English 2019

Monochromatic waves drifting with the wind

Polar mesospheric summer echoes (PMSEs) are very strong radar echoes caused by the presence of ice particles, turbulence, and free electrons in the mesosphere over polar regions. For more than three decades, PMSEs have been used as natural tracers of the complicated atmospheric dynamics of this region. Neutral winds and turbulence parameters have been obtained assuming PMSE horizontal homogeneity in scales of tens of kilometers. Recent radar imaging studies have shown that PMSEs are not homogeneous in these scales and instead they are composed of kilometer-scale structures. In this paper, we present a technique that allows PMSE observations with unprecedented angular resolution (∼ 0.6◦). The technique combines the concept of coherent MIMO (Multi-input multiple-output) and two high-resolution imaging techniques, i.e., Capon and Maximum Entropy (MaxEnt). The resulting resolution is evaluated by imaging specular meteor echoes. The gain in angular resolution compared to previous approaches using SIMO (single-input and multiple-output) and Capon is at least a factor of 2, i.e., at 85 km, we obtain a horizontal resolution of ∼ 900 meters. The advantage of the new technique is evaluated with two events of three-dimensional PMSE structures showing: (1) horizontal wavelengths of 8-10 km and periods of 4-7 minutes, drifting with the background wind, and (2) horizontal wavelengths of 12-16 km and periods of 15-20 minutes not drifting with the background wind. Besides the advantages of the implemented technique, we discuss its current challenges, like the use of reduced power-aperture and processing time, as well as the future opportunities for improving the understanding of the complex small-scale atmospheric dynamics behind PMSEs.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: English
00:16 Copernicus Publications Silent film 2019

Center offset – Capped column 150×250 µm (bar 50×50 µm) Z = 0.5 cm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Column 100×200 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Column 50×200 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Column 50×100 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Column 75×300 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:38 Copernicus Publications Silent film 2019

Column 75×150 µm

Study of the diffraction pattern of cloud particles and respective response of OAPs Optical array probes (OAPs) are classical instrumental means to derive shape, size, and number concentration of cloud and precipitation particles from 2D images. However, recorded 2D images are subject to distortion based on the diffraction of light when particles are imaged out of the object plane of the optical device. This phenomenon highly affects retrievals of microphysical properties of cloud particles. Previous studies of this effect mainly focused on spherical droplets. In this study we propose a theoretical method to compute diffraction pattern of all kinds of cloud particle shapes in order to simulate the response recorded by an OAP. To check the validity of this method, a series of experimental measurements have been performed with a 2D-S probe mounted on a test bench. Measurements are performed using spinning glass discs with imprinted non-circular opaque particle shapes.
  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
00:04 Copernicus Publications Silent film 2019

CT-derived 3D external evolution of experiment C11 / EXP 471 (Zwaan et al. 2019)

  • Published: 2019
  • Publisher: Copernicus Publications
  • Language: Silent film
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