Investigation of the optical characteristics of cirrus clouds with anomalous backscattering

Samokhvalov, I. V.; Bryukhanov, I. D.; Насонов, С. В.; Zhivotenyuk, I. V.; Stykon, A. P.

doi:10.1007/s11182-013-9902-1

Cited by 20 publications

(6 citation statements)

References 1 publication

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“…On the basis of studies whose results are in good agreement with the experimental data, 13 we selected laws of distributions of ice crystal plates in cirrus over sizes and orientation angles, 6 as well as the parameters of these laws. They were used for measuring the phase matrices of polydisperse clouds for different values of preferred (modal) tilt angles of cloud plates (Table 1).…”

Section: Theoretical Calculations Of the Phase Matrices Of Cloudsmentioning

confidence: 96%

Investigation of phase matrices of cirrus containing ensembles of oriented ice particles

et al. 2014

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Experimental results of polarization laser sensing of cirrus with anomalous backscattering are presented. The technique of determining the optical and geometrical characteristics of clouds is described. Experimental data are compared with the meteorological conditions at altitudes of cirrus above the lidar location and with the results of numerical modeling of phase matrices in the approximation of physical optics. The recurrence frequency of meteorological characteristics of "mirror" cirrus is estimated.

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Section: Theoretical Calculations Of the Phase Matrices Of Cloudsmentioning

confidence: 96%

Investigation of phase matrices of cirrus containing ensembles of oriented ice particles

et al. 2014

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“…Thus, 16 intensity vertical profiles are measured in each sensing cycle, from which 16 BSPM elements are calculated. In addition, other important cloud characteristics are determined based on the analysis of lidar measurement data: optical-scattering ratio and optical thickness, and geometrical-altitudes of the lower and upper boundaries, and thickness [20]. As noted in the Introduction, the horizontal orientation of ice particles in HLC leads to anomalous backscattering of optical radiation when sensing into the zenith.…”

Section: High-altitude Matrix Polarization Lidar Of National Research...mentioning

confidence: 99%

Evaluation of the Applicability of the ERA5 Reanalysis for Interpretation of the Polarization Laser Sensing Data of the High-Level Clouds in Western Siberia

Bryukhanov¹,

Penzin²,

Kuchinskaia³

et al. 2022

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This article presents results of the polarization laser studies of the optical and microphysical characteristics of the high-level clouds (HLC). The high-altitude matrix polarization lidar (HAMPL; Tomsk, Russia) is described. HAMPL measures vertical profiles of all elements of the backscattering phase matrix (BSPM) of the HLC. Based on the joint analysis of lidar and radiosonde observations it is shown that the spatial structure of the HLC containing oriented ice crystals is inhomogeneous in the horizontal wind direction. It includes local areas with oriented particles; the sizes of such areas are estimated together with the most probable meteorological conditions of their formation. The shortcomings of the radiosonde observations performed closest to the location of the HAMPL are described. The applicability of the ERA5 reanalysis data of the European Centre for Medium-Range Weather Forecasts for use as an alternative source of information on the vertical profiles of meteorological quantities for the interpretation of HLC lidar sensing data in Western Siberia was checked.

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“…Aerosol layers detected in the UT with ground-based lidars are identified as cirrus clouds if the scattering ratio R(H) > 10 for a laser wavelength  1 = 532 nm (Tao et al, 2008;Samokhvalov et al, 2013). However, according to Sassen et al (1989), the minimum value of R(H) can be 5.2 in the case of invisible to the naked eye co-called "subvisual" cirrus clouds (for a laser wavelength  2 = 694.3 nm) with a thickness of < 1 km.…”

Section: Appendix A: Scattering Ratio R(h ) Values For Cirrus Cloudsmentioning

confidence: 99%

Lidar observations of pyrocumulonimbus smoke plumes in the UTLS over Tomsk (Western Siberia, Russia) from 2000 to 2017

Зуев¹,

Gerasimov²,

Nevzorov³

et al. 2018

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<p><strong>Abstract.</strong> Large volcanic eruptions with the volcanic explosivity index (VEI)&#8201;&#8805;&#8201;3 are widely known to be the strongest source of long-lived aerosol in the upper troposphere and lower stratosphere (UTLS). However, the latest studies have revealed that massive forest (bush) fires represent another strong source of short-term (but intense) aerosol perturbations in the UTLS if combustion products from the fires reach these altitudes via convective ascent within pyrocumulonimbus clouds (pyroCbs). PyroCbs, generated by boreal wildfires in North America and North-East Asia and injecting smoke plumes into the UTLS, have been intensively studied using both ground- and space-based instruments since the beginning of the 21 century. In this paper, we focus on aerosol layers observed in the UTLS over Tomsk (56.48&#176;&#8201;N, 85.05&#176;&#8201;E, Western Siberia, Russia) that could be smoke plumes from such pyroCb events occurred in the 2000&#8211;2017 period. Using the HYSPLIT trajectory analysis, we have reliably assigned ten aerosol layers to nine out of more than 100 documented pyroCb events, the aftereffects of which could potentially be detected in the UTLS over Tomsk. All of the nine pyroCb events occurred in the USA and Canada: one event per year was in 2000, 2002, 2003, 2015, and 2016, whereas two events per year were in 2013 and 2017. No plumes from pyroCbs originating in the boreal zone of Siberia and the Far East (to the east of Tomsk) were observed in the UTLS over Tomsk between 2000 and 2017. We conclude that the lifetimes of pyroCb plumes to be detected in the UTLS using ground-based lidars are less than about a month, i.e. plumes from pyroCbs generated by wildfires to the east of Tomsk can significantly diffuse before reaching the Tomsk lidar station by the westerly zonal transport of air masses. A comparative analysis of the contributions from pyroCb events and volcanic eruptions with VEI&#8201;&#8805;&#8201;3 to aerosol loading of the UTLS over Tomsk has also been made. Finally, an aerosol plume from the Aleutian volcano Bogoslof erupted with VEI&#8201;=&#8201;3 on 28 May 2017 was detected at altitudes between 10.8 and 13.5&#8201;km over Tomsk on 16 June 2017.</p>

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Investigation of the optical characteristics of cirrus clouds with anomalous backscattering

Cited by 20 publications

References 1 publication

Investigation of phase matrices of cirrus containing ensembles of oriented ice particles

Investigation of phase matrices of cirrus containing ensembles of oriented ice particles

Evaluation of the Applicability of the ERA5 Reanalysis for Interpretation of the Polarization Laser Sensing Data of the High-Level Clouds in Western Siberia

Lidar observations of pyrocumulonimbus smoke plumes in the UTLS over Tomsk (Western Siberia, Russia) from 2000 to 2017

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