Stratospheric aerosol particle size distribution based on multi-color polarization measurements of the twilight sky

Ugolnikov, Oleg S.; Maslov, I. A.

doi:10.1016/j.jaerosci.2018.01.002

Cited by 9 publications

(4 citation statements)

References 37 publications

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“…shows the values of r 0 for autumn twilights in 2018 and 2019. They are close to 0.1 μm, which agrees with the median radius of particles measured in balloon experiments [4,6] and the estimates obtained from the approximate analysis of the color and polarization of the twilight sky [27,28] under background conditions. A close value (0.08 μm) was taken a priori in the analysis of the limb measurements performed with the Optical Spectrograph and InfraRed Imager System (OSIRIS) onboard the Odin spacecraft [26].…”

Section: (Left Column)supporting

confidence: 86%

“…For the same values of z and ζ, the theoretical values for the intensity of single scattering by molecules (the Rayleigh component) and aerosols are designated as J 0R (ζ, z, A i ) and J 0A (ζ, z, r 0 , A i ), respec-tively. Here, the size distribution of aerosol particles is assumed to be lognormal with median radius r 0 and distribution width σ = 1.6 [4,[26][27][28]: (1) Parameters A i are the ratios of the extinction coefficients of aerosols and molecules at altitudes h i . These altitudes are defined on the 5-km grid and equal to 5, 10, …, 60 km.…”

Section: Retrieving the Aerosol Propertiesmentioning

confidence: 99%

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Postvolcanic Aerosols: Measurements of Altitude and Particle Sizes with Twilight-Sky Polarimetry

Ugolnikov

Maslov

2021

Cosmic Res

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The intensity and polarization of the twilight-sky background were measured during the epoch of “purple lights” after the Raikoke volcanic eruption in the summer of 2019. The increase in brightness paired with the decrease in polarization was registered, and the changes were especially noticeable in the dusk segment. The altitude distribution of aerosol particles and their mean size were found with previously developed techniques. The median radius of the lognormal distribution (0.11 μm) is typical of the background conditions or weak eruptions; however, the aerosols were mostly concentrated in the upper troposphere and near the tropopause rather than in the stratosphere. From comparison with satellite data obtained almost a decade ago after similar eruptions (like those of the Kasatochi volcano and others), it has been shown that the properties of their aerosols are similar, which confirms that the purple light phenomenon observed in 2019 was of volcanic origin.

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Section: (Left Column)supporting

confidence: 86%

Section: Retrieving the Aerosol Propertiesmentioning

confidence: 99%

Postvolcanic Aerosols: Measurements of Altitude and Particle Sizes with Twilight-Sky Polarimetry

Ugolnikov

Maslov

2021

Cosmic Res

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“…(2008) lie roughly between 30 nm and 130 nm. The assumed mode widths σ can range from monodispersed or effectively 1.0 (Thomason et al, 2008) to 1.4 (Ugolnikov and Maslov, 2018) and 1.6 (Bourassa et al, 2008;Malinina et al, 2018).…”

mentioning

confidence: 99%

Retrieval of stratospheric aerosol size distribution parameters using SAGE-III/ISS extinction measurements at three wavelengths

Wrana

Savigny

Zalach

et al. 2020

Preprint

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Abstract. In this work a novel approach to determine the particle size distribution (PSD) parameters of stratospheric sulfate aerosols is presented. For this, ratios of extinction coefficients obtained from SAGE III/ISS solar occultation measurements at 449 nm, 756 nm and 1544 nm were used to retrieve the mode width and median radius of a size distribution assumed to be monomodal lognormal. The estimated errors at the peak of the stratospheric aerosol layer on average lie between 20 % and 25 % for the median radius and 5 % and 7 % for the mode width. The results are consistent in magnitude with other retrieval results from the literature, but a robust comparison is difficult, mainly because of differences in temporal and spatial coverage. Other quantities like number density and effective radius were also calculated. A major advantage of the described method over other retrieval techniques is that both the median radius and the mode width can be retrieved simultaneously, without having to assume one of them, due to the broad wavelength spectrum covered by the SAGE III/ISS measurements. Also the extinction coefficients from SAGE III/ISS solar occultation measurements, on which the retrieval is based, are calculated without a priori assumptions about the PSD. For those reasons, the data produced with the presented retrieval technique may be a valuable contribution to better understand the variability of stratospheric aerosol size distributions, e.g. after volcanic eruptions. While this study focuses on describing the retrieval method and a future study will discuss the PSD parameter data set produced in depth, some exemplary results for background conditions in June 2017 are shown.

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“…We plan to obtain them using polarimetric measurements of the twilight sky by the technology proposed in [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Earth’s Stratospheric Aerosol Parameters Reconstruction from Polarimetric Measurements of the Sky

Nevodovskyi¹,

Ovsak²,

Vidmachenko³

et al. 2021

IJC

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Earth’s climate changes are the result of natural changes in the energy balance of Sun irradiation and influence of anthropogenic factors on the variations of ozone layer thickness and stratospheric aerosol abundance. It is developed a miniature polarimeter for satellite polarimetric experiments in the ultraviolet region of the sunlight spectrum. The main task of this device is to the obtain an information on the stratospheric aerosol physical properties. We tested this polarimeter on a bench specially designed and manufactured as well. It is possible to measure by it the phase dependences of the degree of linear polarization (DLP) of solar radiation scattered by the Earth’s atmosphere. A set of special computer programs was developed for comparing the spectral polarimetric measurements DLP data of cloudless sky with model calculations of DLP for the artificial gas-aerosol medium. Thus, the prototype of satellite polarimeter as well as special computer programs make it possible to study the Earth’s atmosphere aerosol physical characteristics.

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Stratospheric aerosol particle size distribution based on multi-color polarization measurements of the twilight sky

Cited by 9 publications

References 37 publications

Postvolcanic Aerosols: Measurements of Altitude and Particle Sizes with Twilight-Sky Polarimetry

Postvolcanic Aerosols: Measurements of Altitude and Particle Sizes with Twilight-Sky Polarimetry

Retrieval of stratospheric aerosol size distribution parameters using SAGE-III/ISS extinction measurements at three wavelengths

Earth’s Stratospheric Aerosol Parameters Reconstruction from Polarimetric Measurements of the Sky

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