Gas/aerosol–ash interaction in volcanic plumes: New insights from surface analyses of fine ash particles

Delmelle, Pierre; Lambert, Mathieu; Dufrêne, Yves F.; Gerin, Patrick A.; Öskarsson, N.

doi:10.1016/j.epsl.2007.04.052

Cited by 176 publications

(134 citation statements)

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“…Volcanic ash plumes contain abundant aerosol and gas phases which can be scavenged by silicate ash particles and can cause rapid surface acid dissolution (Rose, 1977;Varekamp et al, 1984;Oskarsson, 1980;Delmelle et al, 2005Delmelle et al, , 2007. This can alter the particle surface chemistry and result in the precipitation of sulphate and halide salts at the ash-liquid interface (Delmelle et al, 2007). Numerous authors have documented microlitic crystals of NaCl and CaSO 4, and FeO films that act to cement ash aggregates together (Varekamp et al, 1984;Tomita et al, 1985;Gilbert et al, 1994;Scolamacchia et al, 2005).…”

Section: Aggregation Within Ash Plumes: Conditions and Downwind Changesmentioning

confidence: 99%

“…Whilst the effect this may have on morphology is poorly constrained, the effects on binding mechanisms can be more readily investigated. Volcanic ash plumes contain abundant aerosol and gas phases which can be scavenged by silicate ash particles and can cause rapid surface acid dissolution (Rose, 1977;Varekamp et al, 1984;Oskarsson, 1980;Delmelle et al, 2005Delmelle et al, , 2007. This can alter the particle surface chemistry and result in the precipitation of sulphate and halide salts at the ash-liquid interface (Delmelle et al, 2007).…”

Section: Aggregation Within Ash Plumes: Conditions and Downwind Changesmentioning

confidence: 99%

See 1 more Smart Citation

A review of volcanic ash aggregation

Brown

Bonadonna

Durant

2012

Physics and Chemistry of the Earth, Parts A/B/C

228

298

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. (2012) 'A review of volcanic ash aggregation.', Physics and chemistry of the earth, parts A/B/C., 45-46 . pp. 65-78. Further information on publisher's website:http://dx.doi.org/10.1016/j.pce. 2011.11.001 Publisher's copyright statement:Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractMost volcanic ash particles with diameters < 63 µm settle from eruption clouds as particle aggregates that cumulatively have larger sizes, lower densities, and higher terminal fall velocities than individual constituent particles. Particle aggregation reduces the atmospheric residence time of fine ash, which results in a proportional increase in fine ash fallout within 10s km to 100s km from the volcano and a reduction in airborne fine ash mass concentrations 1000s km from the volcano. Aggregate characteristics vary with distance from the volcano: proximal aggregates are typically larger (up to cm size) with concentric structures, while distal aggregates are typically smaller (sub-millimetre size). Particles comprising ash aggregates are bound through hydro-bonds (liquid and ice water) and electrostatic forces, and the rate of particle aggregation correlates with cloud liquid water availability. Eruption source parameters (including initial particle size distribution, erupted mass, eruption column height, cloud water content and temperature) and the eruption plume temperature lapse rate, coupled with the environmental parameters, determines the type and spatiotemporal distribution of aggregates. Field studies, lab experiments and modelling investigations have already provided important insights on the process of particle aggregation. However, new integrated observations that combine remote sensing studies of 2 ash clouds with field measurement and sampling, and lab experiments are required to fill current gaps in knowledge surrounding the theory of ash aggregate formation. Abstract word count: 222

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Section: Aggregation Within Ash Plumes: Conditions and Downwind Changesmentioning

confidence: 99%

Section: Aggregation Within Ash Plumes: Conditions and Downwind Changesmentioning

confidence: 99%

A review of volcanic ash aggregation

Brown

Bonadonna

Durant

2012

Physics and Chemistry of the Earth, Parts A/B/C

228

298

View full text Add to dashboard Cite

show abstract

“…As a general rule, halite is one of the predominant species released on the first exposure of volcanic ash to water [Delmelle et al, 2007;Witham et al, 2005]. Because of the condensation of magmatic water vapor when thermal equilibrium is reached, most of halite is likely scavenged along with other very soluble species before the plume reaches the upper troposphere.…”

Section: A Possible Additional Time Marker: the 1991 Volcán Hudson Ermentioning

confidence: 99%

A promising location in Patagonia for paleoclimate and paleoenvironmental reconstructions revealed by a shallow firn core from Monte San Valentín (Northern Patagonia Icefield, Chile)

et al. 2008

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International audienceThe study of past climate variability from ice core investigations has been largely developed both in polar areas over the past decades and, more recently, in tropical regions, specifically along the South American Andes between 0° and 20°S. However a large gap still remains at mid-latitudes in the Southern Hemisphere. In this framework, a 15.3-m long shallow firn core has been extracted in March 2005 from the summit plateau of Monte San Valentín (3747 m, 46°35′S, 73°19′W) in the Northern Patagonia Icefield to test its potential for paleoclimate and paleoenvironmental reconstructions. The firn temperature is −11.9°C at 10-m depth allowing to expect well preserved both chemical and isotopic signals, unperturbed by water percolation. The dating of the core, on the basis of a multi-proxy approach combining annual layer counting and radionuclide measurements, shows that past environment and climate can be reconstructed back to the mid-1960s. A mean annual snow accumulation rate of 36 ± 3 cm year−1 (i.e., 19 ± 2 g cm−2 year−1) is inferred, with a snow density varying between 0.35 and 0.6 g cm−3, which is much lower than accumulation rates previously reported in Patagonia at lower elevations. Here, we present and discuss high-resolution profiles of the isotopic composition of the snow and selected chemical markers. These data provide original information on environmental conditions prevailing over Southern Patagonia in terms of air masses trajectories and origins and biogeochemical reservoirs. Our main conclusion is that the San Valentín site is not only influenced by air masses originating from the southern Pacific and directly transported by the prevailing west winds but also by inputs from South American continental sources from the E–NE, sometimes mixed with circumpolar aged air masses, the relative influence of these two very distinct source areas changing at the interannual timescale. Thus this site should offer a wealth of information regarding (South) Pacific, Argentinian NE–E areas and Antarctic climate variability

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“…The latter process involves the partial dissolution of the ash 335 through reactions with the acidic gases (i.e., mainly SO 2 , HCl, and HF) and 336 aerosols (i.e., H 2 SO 4 ) from the plume, followed by precipitation at the ash-liquid 337 interface being responsible of the enrichment of elements with low volatility 338 (lithophilic elements as Ba and Sr) (Delmelle et al, 2007). This is supported by 339 volcanic gas measurements that indicate lithophilic element enrichment in the 340 gaseous and particulate phases emitted during magma degassing processes in 341 volcanic eruptions (Bundschuh et al, 2004;Hinkley, 1994;Hinkley, 1991; 342…”

mentioning

confidence: 99%