First Volcanic Plume Measurements by an Elastic/Raman Lidar Close to the Etna Summit Craters

From 14 to 17 December 2013, Mt. Etna, in Italy, showed an intense Strombolian activity from the New South East Crater (NSEC). Lidar measurements were performed in Catania, pointing at a thin volcanic plume, clearly visible and dispersed from the summit craters toward the South East. Real-time Lidar observations captured the complex dynamics of the volcanic plume along with the pulsatory nature of the explosive activity and allowed to analyze the geometrical, optical and microphysical properties of the volcanic ash. Both the aerosol backscattering (βA) and the extinction coefficient (αA) profiles at 355nm, and their ratio (the Lidar Ratio - LR) were measured near the volcanic source using an Elastic/Raman Lidar system. Moreover, calibrated particle linear depolarization values (δA) were obtained from the Lidar profiles measured in the parallel and cross polarized channels at 355nm, thus allowing to characterize the particle shape. The βA, LR and δA values were used to estimate the ash concentration (γ) profiles in the volcanic plume. This is the first study of optical properties of volcanic particles through Elastic/Raman measurements at Etna volcano.

[1]  V. Freudenthaler,et al.  Dual-wavelength linear depolarization ratio of volcanic aerosols: Lidar measurements of the Eyjafjallajökull plume over Maisach, Germany , 2012 .

[2]  A. Rittman.  Mount Etna and the 1971 eruption - Structure and evolution of Mount Etna , 1973, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.

[3]  Paul Ayris,et al.  The immediate environmental effects of tephra emission , 2012, Bulletin of Volcanology.

[4]  Thorvaldur Thordarson,et al.  Distal deposition of tephra from the Eyjafjallajökull 2010 summit eruption , 2012 .

[5]  Nicola Spinelli,et al.  Monitoring Etna volcanic plumes using a scanning LiDAR , 2012, Bulletin of Volcanology.

[6]  Nicola Spinelli,et al.  Volcanic ash concentration during the 12 August 2011 Etna eruption , 2015 .

[7]  Michael J. Garay,et al.  MISR observations of Etna volcanic plumes , 2012 .

[8]  Maurizio Ripepe,et al.  Tephra sedimentation during the 2010 Eyjafjallajökull eruption (Iceland) from deposit, radar, and satellite observations , 2011 .

[9]  Boris Behncke,et al.  The exceptional activity and growth of the Southeast Crater, Mount Etna (Italy), between 1996 and 2001 , 2006 .

[10]  J. Biele,et al.  Polarization Lidar: Correction of instrumental effects. , 2000, Optics express.

[11]  Arnau Folch,et al.  Future developments in modelling and monitoring of volcanic ash clouds: outcomes from the first IAVCEI-WMO workshop on Ash Dispersal Forecast and Civil Aviation , 2011, Bulletin of Volcanology.

[12]  L. Mona,et al.  Validation of ash optical depth and layer height retrieved from passive satellite sensors using EARLINET and airborne lidar data: the case of the Eyjafjallajökull eruption , 2016 .

[13]  I. Sokolik,et al.  Hygroscopic properties of volcanic ash , 2011 .

[14]  Thorvaldur Thordarson,et al.  Ash generation and distribution from the April-May 2010 eruption of Eyjafjallajökull, Iceland , 2012, Scientific Reports.

[15]  Michael A. P. McAuliffe,et al.  Four-dimensional distribution of the 2010 Eyjafjallajökull volcanic cloud over Europe observed by EARLINET , 2012 .

[16]  M. Coltelli,et al.  Monitoring and forecasting Etna volcanic plumes , 2009 .

[17]  Frank S. Marzano,et al.  Maximum-Likelihood Retrieval of Volcanic Ash Concentration and Particle Size From Ground-Based Scanning Lidar , 2018, IEEE Transactions on Geoscience and Remote Sensing.

[18]  V. Freudenthaler,et al.  The 16 April 2010 major volcanic ash plume over central Europe: EARLINET lidar and AERONET photometer observations at Leipzig and Munich, Germany , 2010 .

[19]  A. Ansmann,et al.  Combined raman elastic-backscatter LIDAR for vertical profiling of moisture, aerosol extinction, backscatter, and LIDAR ratio , 1992 .

[20]  A. Ansmann,et al.  Aerosol-type-dependent lidar ratios observed with Raman lidar , 2007 .

[21]  T. Trickl,et al.  35 yr of stratospheric aerosol measurements at Garmisch-Partenkirchen : from Fuego to Eyjafjallaj ökull , and beyond , 2022 .

[22]  A. Stohl,et al.  Volcanic dust characterization by EARLINET during Etna's eruptions in 2001–2002 , 2008 .

[23]  V. Freudenthaler,et al.  Depolarization ratio profiling at several wavelengths in pure Saharan dust during SAMUM 2006 , 2009 .

[24]  F. G. Fernald.  Analysis of atmospheric lidar observations: some comments. , 1984, Applied optics.

[25]  Eda Marchetti,et al.  Ash-plume dynamics and eruption source parameters by infrasound and thermal imagery: The 2010 Eyjafjallajökull eruption , 2013 .

[26]  L. Alados-Arboledas,et al.  Eruption of the Eyjafjallajökull Volcano in spring 2010: Multiwavelength Raman lidar measurements of sulphate particles in the lower troposphere , 2013 .

[27]  C. Bonadonna,et al.  Dynamics of wind‐affected volcanic plumes: The example of the 2011 Cordón Caulle eruption, Chile , 2014 .

[28]  R. Hogan,et al.  Determining the contribution of volcanic ash and boundary layer aerosol in backscatter lidar returns: A three‐component atmosphere approach , 2011 .

[29]  P. Delmelle.  Environmental impacts of tropospheric volcanic gas plumes , 2003, Geological Society, London, Special Publications.

[30]  M. Gouhier,et al.  Physical and optical properties of 2010 Eyjafjallajökull volcanic eruption aerosol: ground-based, Lidar and airborne measurements in France , 2011 .

[31]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[32]  Simona Scollo,et al.  Tephra hazard assessment at Mt. Etna (Italy) , 2013 .

[33]  J. Klett.  Stable analytical inversion solution for processing lidar returns. , 1981, Applied optics.

[34]  A. Rittmann,et al.  Structure and Evolution of Mount Etna [and Discussion] , 1973 .

[35]  D. Dingwell,et al.  Fusion characteristics of volcanic ash relevant to aviation hazards , 2014 .

[36]  Alfredo Prata,et al.  Volcanic Ash Hazards to Aviation , 2015 .

[37]  Albert Ansmann,et al.  Vertically resolved separation of dust and smoke over Cape Verde using multiwavelength Raman and polarization lidars during Saharan Mineral Dust Experiment 2008 , 2009 .

[38]  C. Horwell.  Grain-size analysis of volcanic ash for the rapid assessment of respiratory health hazard. , 2007, Journal of environmental monitoring : JEM.

[39]  D. Dingwell,et al.  Volcanic ash supports a diverse bacterial community in a marine mesocosm , 2017, Geobiology.

[40]  Takuji Nakamura,et al.  Calculation of the calibration constant of polarization lidar and its dependency on atmospheric temperature. , 2002, Optics express.

[41]  Philippe Labazuy,et al.  An unloading foam model to constrain Etna’s 11–13 January 2011 lava fountaining episode , 2011 .

[42]  Franco Marenco,et al.  Airborne lidar observations of the 2010 Eyjafjallajökull volcanic ash plume , 2011 .

[43]  S. Scollo,et al.  The effect of Etna volcanic ash clouds on the Maltese Islands , 2013 .

[44]  Frank S. Marzano,et al.  A Multi-Sensor Approach for Volcanic Ash Cloud Retrieval and Eruption Characterization: The 23 November 2013 Etna Lava Fountain , 2016, Remote. Sens..

[45]  Nicola Spinelli,et al.  Lidar depolarization measurement of fresh volcanic ash from Mt. Etna, Italy , 2012 .

[46]  Josef Gasteiger,et al.  On the visibility of airborne volcanic ash and mineral dust from the pilot’s perspective in flight , 2012 .

[47]  Peter W. Webley,et al.  Volcanic ash plume identification using polarization lidar: Augustine eruption, Alaska , 2007 .

[48]  Alan Robock,et al.  Volcanism and the Earth's Atmosphere , 2003 .

[49]  A. Stohl,et al.  Volcanic aerosol optical properties and phase partitioning behavior after long-range advection characterized by UV-Lidar measurements , 2012 .

[50]  Luca Merucci,et al.  Eruption column height estimation of the 2011-2013 Etna lava fountains , 2014 .

[51]  Josef Gasteiger,et al.  Volcanic ash from Iceland over Munich: mass concentration retrieved from ground-based remote sensing measurements , 2010 .

[52]  P. Baxter,et al.  Atmospheric dispersion, environmental effects and potential health hazard associated with the low-altitude gas plume of Masaya volcano, Nicaragua , 2002 .

[53]  J. Taddeucci,et al.  The thermal stability of Eyjafjallajökull ash versus turbine ingestion test sands , 2014, Journal of Applied Volcanology.

[54]  G. Gallina,et al.  Volcanic-ash hazard to aviation during the 2003–2004 eruptive activity of Anatahan volcano, Commonwealth of the Northern Mariana Islands , 2005 .

[55]  A. Stohl,et al.  Optical properties and vertical extension of aged ash layers over the Eastern Mediterranean as observed by Raman lidars during the Eyjafjallajökull eruption in May 2010 , 2012 .

[56]  Daniele Andronico,et al.  Relationship between tremor and volcanic activity during the Southeast Crater eruption on Mount Etna in early 2000 , 2003 .

[57]  E. Maters,et al.  HCl uptake by volcanic ash in the high temperature eruption plume: mechanistic insights , 2014 .

[58]  J. Ackermann.  The Extinction-to-Backscatter Ratio of Tropospheric Aerosol: A Numerical Study , 1998 .

[59]  N. Spinelli,et al.  Calibration of Multi-wavelength Raman Polarization Lidar , 2015 .

[60]  L. Mona,et al.  Multi-wavelength Raman lidar observations of the Eyjafjallajökull volcanic cloud over Potenza, southern Italy , 2011 .

[61]  Paola Del Carlo,et al.  Types of eruptions of Etna volcano AD 1670–2003: implications for short-term eruptive behaviour , 2005 .

[62]  V. Freudenthaler,et al.  Towards an aerosol classification scheme for future EarthCARE lidar observations and implications for research needs , 2015 .

[63]  A. Ansmann,et al.  Measurement of atmospheric aerosol extinction profiles with a Raman lidar. , 1990, Optics letters.

[64]  Boris Behncke,et al.  The 2011-2012 summit activity of Mount Etna: Birth, growth and products of the new SE crater☆ , 2014 .

[65]  Laser remote sensing of the atmosphere , 1986 .

[66]  A. Stohl,et al.  Optical, microphysical, mass and geometrical properties of aged volcanic particles observed over Athens, Greece, during the Eyjafjallajokull eruption in April 2010 through synergy of Raman lidar and sunphotometer measurements , 2013 .

[67]  L. Alados-Arboledas,et al.  Monitoring of the Eyjafjallajökull volcanic aerosol plume over the Iberian Peninsula by means of four EARLINET lidar stations , 2011 .