Aerosol properties of the Eyjafjallajökull ash derived from sun photometer and satellite observations over the Iberian Peninsula

Toledano, Carlos; Bennouna, Yasmine; Cachorro, Victoria E.; Galisteo, José Pablo Ortiz de; Stohl, Andreas; Stebel, K.; Kristiansen, Nina Iren; Olmo, F.J.; Lyamani, H.; Muñoz, María Ángeles Obregón; Estellés, V.; Wagner, Frank; Baldasano, J. M.; González, I.; Clarisse, Lieven; Baraja, Angel Máximo de Frutos

doi:10.1016/j.atmosenv.2011.09.072

Cited by 31 publications

(23 citation statements)

References 34 publications

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“…These values are significantly lower than the peak values of ca. 0.7 at 532 nm observed over Leipzig (Germany) in the volcanic layer during this event and the moderate columnar optical depth around 0.3-0.4 and 0.5 observed over the Iberian peninsula (5-11 May) and Cabauw (17-21 May), respectively, for almost direct transport (Toledano et al, 2012;Ansmann et al, 2011). The low values observed at CIAO are related both to the larger distance from the Eyjafjallajökull volcano and the dispersion of the volcanic cloud during its transport across Europe.…”

Section: Discussionmentioning

confidence: 99%

“…The cloud reached Italy and Greece starting from 19-20 April, after passing the Alps (Pappalardo et al, 2010a;Lettino et al, 2011;Campanelli et al, 2012;Papayannis et al, 2012). In May 2010, the volcanic cloud was transported over the Iberian Peninsula (Toledano et al, 2012) and then moved towards the East, reaching Italy, Greece and Turkey (Pappalardo et al, 2010a;Papayannis et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…As mentioned above, some papers reporting the observations of Eyjafjallajökull volcanic cloud in southern Europe (e.g. Lettino et al, 2011;Campanelli et al, 2012;Papayannis et al, 2012;Toledano et al, 2012) have recently appeared in the literature. The arrival of the volcanic cloud in the Mediterranean region is particularly interesting for several reasons.…”

Section: Introductionmentioning

confidence: 99%

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Multi-wavelength Raman lidar observations of the Eyjafjallajökull volcanic cloud over Potenza, southern Italy

et al. 2012

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Abstract. During the eruption of Eyjafjallajökull in April-May 2010 multi-wavelength Raman lidar measurements were performed at the CNR-IMAA Atmospheric Observatory (CIAO), whenever weather conditions permitted observations. A methodology both for volcanic layer identification and accurate aerosol typing has been developed. This methodology relies on the multi-wavelength Raman lidar measurements and the support of long-term lidar measurements performed at CIAO since 2000. The aerosol mask for lidar measurements performed at CIAO during the 2010 Eyjafjallajökull eruption has been obtained. Volcanic aerosol layers were observed in different periods: 19-22 April, 27-29 April, 8-9 May, 13-14 May and 18-19 May. A maximum aerosol optical depth of about 0.12-0.13 was observed on 20 April, 22:00 UTC and 13 May, 20:30 UTC. Volcanic particles were detected at low altitudes, in the free troposphere and in the upper troposphere. Occurrences of volcanic particles within the PBL were detected on 21-22 April and 13 May. A Saharan dust event was observed on 13-14 May: dust and volcanic particles were simultaneously detected at CIAO at separated different altitudes as well as mixed within the same layer.Lidar ratios at 355 and 532 nm, theÅngström exponent at 355/532 nm, the backscatter-relatedÅngström exponent at 532/1064 nm and the particle linear depolarization ratio at 532 nm measured inside the detected volcanic layers are discussed. The dependence of these quantities on relative humidity has been investigated by using co-located microwave profiler measurements. The measured values of these intensive parameters indicate the presence of volcanic sulfates/continental mixed aerosol in the volcanic aerosol layers observed at CIAO. In correspondence of the maxima observed in the volcanic aerosol load on 19-20 April and 13 May, different values of intensive parameters were observed. Apart from the occurrence of sulfate aerosol, these values indicate also the presence of some ash which is affected by the aging during transport over Europe.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-wavelength Raman lidar observations of the Eyjafjallajökull volcanic cloud over Potenza, southern Italy

et al. 2012

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“…When values are preassigned, the refractive index of bulk matter or sulfuric acid solutions are commonly used (see, e.g., Oppenheimer, 2000, 2001;Spinetti et al, 2003;Kahn et al, 2007;Martin et al, 2009;Marenco et al, 2011;Young et al, 2012). Examples for which the refractive index was retrieved along with a size distribution can be found in the works by Toledano et al (2012), Waquet et al (2014), and references therein. Effective medium approximations were used in inverse problems by Abo Riziq et al (2007) and Adler et al (2013Adler et al ( , 2014 where refractive indices of laboratory-generated aerosols were retrieved by comparing the measured size-resolved extinction efficiency with Mie theory calculations.…”

Section: Introductionmentioning

confidence: 99%

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

Shcherbakov¹,

Jourdan²,

Voigt³

et al. 2016

Atmos. Chem. Phys.

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Abstract. Aerosols of the volcanic degassing plumes from Mt. Etna and Mt. Stromboli were probed with in situ instruments on board the Deutsches Zentrum für Luft-und Raumfahrt research aircraft Falcon during the contrail, volcano, and cirrus experiment CONCERT in September 2011. Aerosol properties were analyzed using angular-scattering intensities and particle size distributions measured simultaneously with the Polar Nephelometer and the Forward Scattering Spectrometer probes (FSSP series 100 and 300), respectively. Aerosols of degassing plumes are characterized by low values of the asymmetry parameter (between 0.6 and 0.75); the effective diameter was within the range of 1.5-2.8 µm and the maximal diameter was lower than 20 µm. A principal component analysis applied to the Polar Nephelometer data indicates that scattering features of volcanic aerosols of different crater origins are clearly distinctive from angular-scattering intensities of cirrus and contrails. Retrievals of aerosol properties revealed that the particles were "optically spherical" and the estimated values of the real part of the refractive index are within the interval from 1.35 to 1.38. The interpretation of these results leads to the conclusion that the degassing plume aerosols were porous with air voids. Our estimates suggest that aerosol particles contained about 18 to 35 % of air voids in terms of the total volume.

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“…The sunsky photometer, on the other hand, provides spectrally resolved column-integrated particle extinction values (aerosol optical thickness, AOT) and permits the retrieval of finemode-and coarse-mode-related AOTs (O'Neill et al, 2003;Dubovik et al, 2006) and of microphysical particle properties such as volume and surface-area concentrations for the fine-mode and coarse-mode fractions (Dubovik and King, 2000;Dubovik et al, 2006). Toledano et al (2011Toledano et al ( , 2012 Published by Copernicus Publications on behalf of the European Geosciences Union.…”

Section: Introductionmentioning

confidence: 99%

Profiling of fine and coarse particle mass: case studies of Saharan dust and Eyjafjallajökull/Grimsvötn volcanic plumes

et al. 2012

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Abstract. The polarization lidar photometer networking (POLIPHON) method introduced to separate coarse-mode and fine-mode particle properties of Eyjafjallajökull volcanic aerosols in 2010 is extended to cover Saharan dust events as well. Furthermore, new volcanic dust observations performed after the Grimsvötn volcanic eruptions in 2011 are presented. The retrieval of particle mass concentrations requires mass-specific extinction coefficients. Therefore, a review of recently published mass-specific extinction coefficients for Saharan dust and volcanic dust is given. Case studies of four different scenarios corroborate the applicability of the profiling technique: (a) Saharan dust outbreak to central Europe, (b) Saharan dust plume mixed with biomass-burning smoke over Cape Verde, and volcanic aerosol layers originating from (c) the Eyjafjallajökull eruptions in 2010 and (d) the Grimsvötn eruptions in 2011. Strong differences in the vertical aerosol layering, aerosol mixing, and optical properties are observed for the different volcanic events.

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Aerosol properties of the Eyjafjallajökull ash derived from sun photometer and satellite observations over the Iberian Peninsula

Cited by 31 publications

References 34 publications

Multi-wavelength Raman lidar observations of the Eyjafjallajökull volcanic cloud over Potenza, southern Italy

Multi-wavelength Raman lidar observations of the Eyjafjallajökull volcanic cloud over Potenza, southern Italy

Porous aerosol in degassing plumes of Mt. Etna and Mt. Stromboli

Profiling of fine and coarse particle mass: case studies of Saharan dust and Eyjafjallajökull/Grimsvötn volcanic plumes

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