Performance of the Aerosol Species Separation Algorithm (ASSA) Using Data from a Raman-Depolarization Lidar System at Thessaloniki, Greece

Michailidis, Konstantinos; Siomos, Nikolaos; Balis, Dimitris

doi:10.3390/environsciproc2023026070

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“…We aim to apply the main lessons and insights stemming from this study to the ongoing severe 2023 fire season in Greece. From the lidar observations, we aim to apply a novel aerosol species separation algorithm on the THELISYS observations, designed to retrieve vertical concentration profiles of individual aerosol species by combining measurements from lidar systems and spectrophotometers [63]. Pure, as well as mixed aerosol types can be identified which will greatly enable future in-depth studies of the aerosol layers reaching Thessaloniki.…”

Section: Correlative Stratospheric Measurements For 25 July 2019mentioning

confidence: 99%

Investigating a Persistent Stratospheric Aerosol Layer Observed over Southern Europe during 2019

Voudouri,

Michailidis,

Koukouli

et al. 2023

Remote Sensing

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A persistent stratospheric aerosol layer first appeared during July 2019 above Thessaloniki, Greece (40.5°N, 22.9°E). It was initially at 12 km and, during August 2019, was even up to 20 km, with increased thickness and reduced attenuated backscatter levels till the end of the year. In this study, we analyze the geometrical and optical properties of this stratospheric layer, using ground-based Lidar measurements, CALIOP/CALIPSO & OMPS-LP space-borne observations, as well as CAMS/ECMWF assimilation experiments. The main aim of the paper is to present an overview of this atmospheric feature and to identify any temporal changes in the aerosol properties that would signify substantial changes in the composition of this long-lasting stratospheric plume over Thessaloniki. This aim is further enhanced by emphasizing the importance of the combined information based on active ground- and space-borne lidars, passive remote sensing, and models during the complex stratospheric aerosol conditions as those encountered during 2019. The layer’s origin is linked to the Raikoke volcanic eruption in the Kuril Islands in June 2019, yielding a particle linear depolarization ratio less than 0.05, while some indications exist that the intense forest fires at mid and high northern latitudes throughout the summer of 2019 also contributed to the persistent layer. We report that in July, mainly volcanic sulphate aerosol layers with a 1–3 km vertical extent were identified in the stratosphere at ~15 km over Thessaloniki, while after August and until the end of 2019, the plume heights showed a significant month-to-month variability and a broadening (with thickness greater than 3 km) towards lower altitudes. The aerosol optical thickness was found to be in the range between 0.004 and 0.125 (visible) and 0.001 and 0.095 (infrared) and the particle depolarization of the detected stratospheric plume was found to be 0.03 ± 0.04, indicative of spherical particles, such as sulphate aerosols.

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Section: Correlative Stratospheric Measurements For 25 July 2019mentioning

confidence: 99%

Investigating a Persistent Stratospheric Aerosol Layer Observed over Southern Europe during 2019

Voudouri,

Michailidis,

Koukouli

et al. 2023

Remote Sensing

Self Cite

View full text Add to dashboard Cite

show abstract

Performance of the Aerosol Species Separation Algorithm (ASSA) Using Data from a Raman-Depolarization Lidar System at Thessaloniki, Greece

Abstract: This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).

Cited by 1 publication

References 8 publications

Investigating a Persistent Stratospheric Aerosol Layer Observed over Southern Europe during 2019

Investigating a Persistent Stratospheric Aerosol Layer Observed over Southern Europe during 2019

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