12 research outputs found
Ground-Based Measurements of the 2014–2015 Holuhraun Volcanic Cloud (Iceland)
The 2014–2015 Bárðarbunga fissure eruption at Holuhraun in central Iceland was distinguished by the high emission of gases, in total 9.6 Mt SO2, with almost no tephra. This work collates all ground-based measurements of this extraordinary eruption cloud made under particularly challenging conditions: remote location, optically dense cloud with high SO2 column amounts, low UV intensity, frequent clouds and precipitation, an extensive and hot lava field, developing ramparts, and high-latitude winter conditions. Semi-continuous measurements of SO2 flux with three scanning DOAS instruments were augmented by car traverses along the ring-road and along the lava. The ratios of other gases/SO2 were measured by OP-FTIR, MultiGAS, and filter packs. Ratios SO2/HCl = 30–110 and SO2/HF = 30–130 show a halogen-poor eruption cloud. Scientists on-site reported extremely minor tephra production during the eruption. OPC and filter packs showed low particle concentrations similar to non-eruption cloud conditions. Three weather radars detected a droplet-rich eruption cloud. Top of eruption cloud heights of 0.3–5.5 km agl were measured with ground- and aircraft-based visual observations, web camera and NicAIR II infrared images, triangulation of scanning DOAS instruments, and the location of SO2 peaks measured by DOAS traverses. Cloud height and emission rate measurements were critical for initializing gas dispersal simulations for hazard forecasting
Two weather radar time series of the altitude of the volcanic plume during the May 2011 eruption of Grímsvötn, Iceland
The eruption of Grímsvötn volcano in Iceland in 2011 lasted for a week, 21&ndash;28 May. The eruption was explosive and peaked during the first hours, with the eruption plume reaching 20&ndash;25 km altitude. The height of the plume was monitored every 5 min with a C-band weather radar located at Keflavík International Airport and a mobile X-band radar, 257 km and 75 km distance from the volcano respectively. In addition, photographs taken during the first half-hour of the eruption give information regarding the initial rise. Time series of the plume-top altitude were constructed from the radar observations. This paper presents the two independent radar time series. The series have been cross validated and there is a good agreement between them. The echo top radar series of the altitude of the volcanic plume are publicly available from the Pangaea Data Publisher (<a href="http://dx.doi.org/10.1594/PANGAEA.778390"target="_blank">doi:10.1594/PANGAEA.778390</a>)
Plume-top altitude time-series during May 2011 volcanic eruption of Grímsvötn, Iceland
Plume-top altitude time series of the volcanic plume during the eruption of Grímsvötn in Iceland 21-28 May 2011. The altitude was estimated from weather radar echo top data from two weather radars, Keflavik and Klaustur. Keflavik radar is a fixed position C-band weather radar close to Keflavik International Airport, at 64°01.583'N, 22°38.150'W. The height of the antenna is 47 m a.s.l. and the distance to Grímsvötn volcano is 257 km. Klaustur radar is a mobile X-band weather radar located close to Kirkjubaejarklaustur, at 63°46.500'N, 17°57.817'W. The height of the antenna is also 47 m a.s.l. and the distance to Grímsvötn volcano is 75 km
Quantifying the mass loading of particles in an ash cloud remobilized from tephra deposits on Iceland
On 16–17 September 2013 strong surface winds over tephra deposits in
southern Iceland led to the resuspension and subsequent advection of
significant quantities of volcanic ash. The resulting resuspended ash cloud
was transported to the south-east over the North Atlantic Ocean and, due to
clear skies at the time, was exceptionally well observed in satellite
imagery. We use satellite-based measurements in combination with radiative
transfer and dispersion modelling to quantify the total mass of ash
resuspended during this event. Typically ash clouds from explosive eruptions
are identified in satellite measurements from a negative brightness
temperature difference (BTD) signal; however this technique assumes that the
ash resides at high levels in the atmosphere. Due to a temperature inversion
in the troposphere over southern Iceland during 16 September 2013, the
resuspended ash cloud was constrained to altitudes of < 2 km a.s.l. We show
that a positive BTD signal can instead be used to identify ash-containing
pixels from satellite measurements. The timing and location of the ash cloud
identified using this technique from measurements made by the Visible Infrared Imaging
Radiometer Suite (VIIRS) on board the Suomi National Polar-orbiting Partnership
(NPP) satellite agree well with model predictions using the dispersion model
NAME (Numerical Atmospheric-dispersion Modelling Environment). Total column mass loadings are determined from the VIIRS data using an
optimal estimation technique which accounts for the low altitude of the
resuspended ash cloud and are used to calibrate the emission rate in the
resuspended ash scheme in NAME. Considering the tephra deposits from the
recent eruptions of Eyjafjallajökull and Grímsvötn as the
potential source area for resuspension for this event, we estimate that
∼ 0.2 Tg of ash was remobilized during 16–17 September 2013