Topics


![]()
![]()
Measurement and simulation of the 16/17 April 2010 Eyjafjallajökull volcanic ash layer dispersion in the northern Alpine region
Atmospheric Chemistry and Physics (ACP), Vol. 11. N° 3. Emeis S.; Forkel R.; Junkermann W.; et al. - Copernicus GmbH, 2011The spatial structure and the progression speed of the first ash layer from the Icelandic Eyjafjallajökull volcano which reached Germany on 16/17 April is investigated from remote sensing data and numerical simulations. The ceilometer network of the German Meteorological Service was able to follow the progression of the ash layer over the whole of Germany. This first ash layer turned out to be a rather shallow layer of only several hundreds of metres thickness which was oriented slantwise in the middle troposphere and which was brought downward by large-scale sinking motion over Southern Germa ...
[article]Measurement and simulation of the 16/17 April 2010 Eyjafjallajökull volcanic ash layer dispersion in the northern Alpine region
![]()
![]()
Available online: http://dx.doi.org/10.5194/acp-11-2689-2011
S. Emeis ; R. Forkel ; W. Junkermann ; K. Schäfer ; H. Flentje ; S. Gilge ; W. Fricke ; M. Wiegner ; V. Freudenthaler ; S. Groβ ; L. Ries ; F. Meinhardt ; W. Birmili ; C. Münkel ; F. Obleitner ; P. Suppan
in Atmospheric Chemistry and Physics (ACP) > Vol. 11. N° 3 [03/01/2011] . - p.2689-2701The spatial structure and the progression speed of the first ash layer from the Icelandic Eyjafjallajökull volcano which reached Germany on 16/17 April is investigated from remote sensing data and numerical simulations. The ceilometer network of the German Meteorological Service was able to follow the progression of the ash layer over the whole of Germany. This first ash layer turned out to be a rather shallow layer of only several hundreds of metres thickness which was oriented slantwise in the middle troposphere and which was brought downward by large-scale sinking motion over Southern Germany and the Alps. Special Raman lidar measurements, trajectory analyses and in-situ observations from mountain observatories helped to confirm the volcanic origin of the detected aerosol layer. Ultralight aircraft measurements permitted the detection of the arrival of a second major flush of volcanic material in Southern Germany. Numerical simulations with the Eulerian meso-scale model MCCM were able to reproduce the temporal and spatial structure of the ash layer. Comparisons of the model results with the ceilometer network data on 17 April and with the ultralight aircraft data on 19 April were satisfying. This is the first example of a model validation study from this ceilometer network data.
Language(s): English
Format: Digital (Free)Tags: Alps, the ; Region VI - Europe ; Atmosphere ; Airborne ash ; Volcanic Eruption ; Natural hazards
Add tag
[article]No review, please log in to add yours !
![]()
![]()
SO2 and BrO observation in the plume of the Eyjafjallajökull volcano 2010: CARIBIC and GOME-2 retrievals
Atmospheric Chemistry and Physics (ACP), Vol. 11. N° 3. Heue K.-P.; Brenninkmeijer C.A.M.; Baker A.K.; et al. - Copernicus GmbH, 2011The ash cloud of the Eyjafjallajökull (also referred to as: Eyjafjalla (e.g. Schumann et al., 2011), Eyjafjöll or Eyjafjoll (e.g. Ansmann et al., 2010)) volcano on Iceland caused closure of large parts of European airspace in April and May 2010. For the validation and improvement of the European volcanic ash forecast models several research flights were performed. Also the CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) flying laboratory, which routinely measures at cruise altitude (≈11 km) performed three dedicated measurements flights ...
[article]SO2 and BrO observation in the plume of the Eyjafjallajökull volcano 2010: CARIBIC and GOME-2 retrievals
![]()
![]()
Available online: http://dx.doi.org/10.5194/acp-11-2973-2011
K.-P. Heue ; C.A.M. Brenninkmeijer ; A.K. Baker ; A. Rauthe-Schöch ; D. Walter ; T. Wagner ; C. Hörmann ; H. Sihler ; B. Dix ; U. Frieß ; U. Platt ; B.G. Martinsson ; P.F.J. van Velthoven ; A. Zahn ; R. Ebinghaus
in Atmospheric Chemistry and Physics (ACP) > Vol. 11. N° 3 [03/01/2011] . - p.2973-2989The ash cloud of the Eyjafjallajökull (also referred to as: Eyjafjalla (e.g. Schumann et al., 2011), Eyjafjöll or Eyjafjoll (e.g. Ansmann et al., 2010)) volcano on Iceland caused closure of large parts of European airspace in April and May 2010. For the validation and improvement of the European volcanic ash forecast models several research flights were performed. Also the CARIBIC (Civil Aircraft for the Regular Investigation of the atmosphere Based on an Instrument Container) flying laboratory, which routinely measures at cruise altitude (≈11 km) performed three dedicated measurements flights through sections of the ash plume. Although the focus of these flights was on the detection and quantification of the volcanic ash, we report here on sulphur dioxide (SO2) and bromine monoxide (BrO) measurements with the CARIBIC DOAS (Differential Optical Absorption Spectroscopy) instrument during the second of these special flights on 16 May 2010. As the BrO and the SO2 observations coincide, we assume the BrO to have been formed inside the volcanic plume. Average SO2 and BrO mixing ratios of ≈40 ppb and ≈5 ppt respectively are retrieved inside the plume. The BrO to SO2 ratio retrieved from the CARIBIC observation is ≈1.3×10−4. Both SO2 and BrO observations agree well with simultaneous satellite (GOME-2) observations. SO2 column densities retrieved from satellite observations are often used as an indicator for volcanic ash. As the CARIBIC O4 column densities changed rapidly during the plume observation, we conclude that the aerosol and the SO2 plume are collocated. For SO2 some additional information on the local distribution can be derived from a comparison of forward and back scan GOME-2 data. More details on the local plume size and position are retrieved by combining CARIBIC and GOME-2 data.
Language(s): English
Format: Digital (Free)Tags: Aviation ; Airborne ash ; Volcanic Eruption ; Natural hazards ; Iceland
Add tag
[article]No review, please log in to add yours !
![]()
![]()
Inaugural Meeting Scientific Advisory Group on Volcanic Ash (VA-SAG) : Final Report
World Meteorological Organization (WMO) ; International Union of Geodesy and Geophysics (IUGG); International Civil Aviation Organization (ICAO) - WMO, 2010
World Meteorological Organization (WMO) ; International Union of Geodesy and Geophysics ; International Civil Aviation Organization
Published by: WMO ; 2010Language(s): English
Format: Digital (Free)No review, please log in to add yours !
![]()
![]()
5th International Workshop on Volcanic Ash : Report
World Meteorological Organization (WMO) ; International Civil Aviation Organization (ICAO); Dirección General de Aeronautica Civil - WMO, 2010
World Meteorological Organization (WMO) ; International Civil Aviation Organization ; Dirección General de Aeronautica Civil (Chile)
Published by: WMO ; 2010Language(s): English
Format: Digital (Free)No review, please log in to add yours !
Université de Genève ; CERG ; BSC ; BGS ; World Meteorological Organization (WMO) ; IAVCEI
Event: Ash Dispersal Forecast and Civil Aviation Workshop (8‐20 October 2010; Geneva, Switzerland)
Published by: UNIGE ; 2010Language(s): English
Format: Digital (Free)No review, please log in to add yours !
![]()
![]()
![]()
Canada national report prepared for the IDNDR mid-term review and the 1994 World Conference on Natural Disaster Reduction
RSC, 1994This report presents the institutional and legal framework for disaster risk reduction in Canada, and describes its common disaster risks and natural hazards, such as flood, wild fire, earthquake, land slide and volcano. It outlines the strategies, plans, projects and activities related to disaster prevention and risk management.
Permalink![]()
![]()
![]()
Bermuda national report prepared for the IDNDR mid-term review and the 1994 World Conference on Natural Disaster Reduction
Bermuda - government, 1994This report presents the institutional and legal framework for disaster risk reduction in Bermuda, and describes its common disaster risks and natural hazards, such as earthquake, flood, volcanic eruption, tornado, wildfire and hurricane. It outlines the strategies, plans, projects and activities related to disaster prevention and risk management.
Permalink![]()
![]()
![]()
Colombia national report prepared for the IDNDR mid-term review and the 1994 World Conference on Natural Disaster Reduction
Colombia - government, 1994This report presents the institutional and legal framework for disaster risk reduction in Colombia, and describes its common disaster risks and natural hazards, such as earthquake, volcano, tsunami, storm, land slide and flood. It outlines the strategies, plans, projects and activities related to disaster prevention and risk management.
Permalink![]()
![]()
![]()
Cost Rica national report prepared for the IDNDR mid-term review and the 1994 World Conference on Natural Disaster Reduction
Costa Rica - government, 1994This report presents the institutional and legal framework for disaster risk reduction in Costa Rica, and describes its common disaster risks and natural hazards, such as flood, land slide, earthquake and volcano. It outlines the strategies, plans, projects and activities related to disaster prevention and risk management.
Permalink