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Nabro volcano aerosol in the stratosphere over Georgia, South Caucasus from ground-based spectrometry of twilight sky brightness

dc.contributor.authorMateshvili, N.
dc.contributor.authorFussen, D.
dc.contributor.authorMateshvili, G.
dc.contributor.authorMateshvili, I.
dc.contributor.authorVanhellemont, F.
dc.contributor.authorKyrola, E.
dc.contributor.authorTukiainen, S.
dc.contributor.authorKujanpaa, J.
dc.contributor.authorBingen, C.
dc.contributor.authorRobert, C.
dc.contributor.authorTetard, C.
dc.contributor.authorDekemper, E.
dc.date2013
dc.date.accessioned2016-03-25T11:11:11Z
dc.date.available2016-03-25T11:11:11Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/2921
dc.descriptionGround-based spectral measurements of twilight sky brightness were carried out between September 2009 and August 2011 in Georgia, South Caucasus. The algorithm which allowed to retrieve the lower stratospheric and upper tropospheric aerosol extinction profiles was developed. The Monte-Carlo technique was used to correctly represent multiple scattering in a spherical atmosphere. The estimated stratospheric aerosol optical depths at a wavelength of 780 nm were: 6 × 10−3 ± 2 × 10−3 (31 August 2009–29 November 2009), 2.5 × 10−3 ± 7 × 10−4 (20 March 2010–15 January 2011) and 8 × 10−3 ± 3 × 10−3 (18 July 2011–3 August 2011). The optical depth values correspond to the moderately elevated stratospheric aerosol level after the Sarychev eruption in 2009, background stratospheric aerosol layer, and the volcanically disturbed stratospheric aerosol layer after the Nabro eruption in June 2011. Reconsideration of measurements acquired soon after the Pinatubo eruption in 1991 allowed to model the phenomenon of the "second purple light", a twilight sky brightness enhancement at large solar zenith angles (97–102°). Monte-Carlo modelling reveals that the second purple light is caused by multiple scattering in the stratospheric aerosol layer.
dc.languageeng
dc.titleNabro volcano aerosol in the stratosphere over Georgia, South Caucasus from ground-based spectrometry of twilight sky brightness
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeaerosol
dc.subject.freealgorithm
dc.subject.freelight intensity
dc.subject.freelight scattering
dc.subject.freeMonte Carlo analysis
dc.subject.freeoptical depth
dc.subject.freestratosphere
dc.subject.freetwilight
dc.subject.freevolcanic eruption
dc.subject.freewavelength
dc.subject.freezenith angle
dc.subject.freeEthiopia
dc.subject.freeGeorgia
dc.subject.freeNabro
dc.subject.freeUnited States
dc.subject.freePinatubo
dc.source.titleAtmospheric Measurement Techniques
dc.source.volume6
dc.source.issue10
dc.source.page2563-2576
Orfeo.peerreviewedYes
dc.identifier.doi10.5194/amt-6-2563-2013
dc.identifier.scopus2-s2.0-84885365616


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