Volcanic Cloud - an overview | ScienceDirect Topics
Apr 1, 2008 · A range of cloud instability features have been documented in ash clouds from recent eruptions. During the Mount Redoubt eruptions in 1990, “ash veils” were observed using LiDAR at the base of an ash cloud (Hobbs et al., 1991). At the time of observation, the cloud was about 3 h old and had been transported ∼130 km from
Enhancing detection of volcanic ash clouds from space with ...
Apr 1, 2024 · Furthermore, a high level of SO 2 in a volcanic cloud can contribute to the formation of acid rain when SO 2 combines with water vapor and may cause acute respiratory symptoms among people living near an active volcano (Ishigami et al., 2008; Williams-Jones and Rymer, 2015). Observing and tracking volcanic clouds are crucial to enhance the ...
Ash Aggregation in Volcanic Clouds - ScienceDirect
Jan 1, 2016 · A range of cloud instability features have been documented in ash clouds from recent eruptions. During the Mount Redoubt eruptions in 1990, “ash veils” were observed using LiDAR at the base of an ash cloud (Hobbs et al., 1991). At the time of observation, the cloud was about 3 h old and had been transported ∼130 km from
Deposits associated with the 1990–1995 eruption of Unzen …
Apr 1, 1999 · The 1990–1995 eruption of Unzen volcano emphasizes the hazard of block-and-ash flows caused by dome collapse. Recent geological study (Watanabe and Hoshizumi, 1995) shows that this type of eruption is precedented at Unzen volcano, although the older two historical eruptions (1663 and 1792) extruded dacite lava flows and generated no block-and ...
Near-real-time volcanic ash cloud detection: Experiences from the ...
Sep 30, 2009 · Once an ash cloud is observed, then information can be released through the volcano observatory or VAAC. Here, we illustrate how the reverse absorption technique for detecting volcanic ash clouds, Prata (1989a) , is used as part of the AVO remote sensing system and provide examples of detected ash clouds as well as false detections of non ...
In-situ aircraft observations of the 2000 Mt. Hekla volcanic cloud ...
Jul 15, 2005 · NASA's DC-8 flying laboratory flew directly through the eruptive cloud from Mt. Hekla, a volcano near the southern shore of Iceland, on February 28, 2000. The instruments aboard the research aircraft obtained a comprehensive portrait of the trace gas composition, aerosol properties, and meteorological conditions in the volcano cloud.
Improved prediction and tracking of volcanic ash clouds
Sep 30, 2009 · Casadevall and Krohn (1995) illustrate how the 1992 Crater Peak eruption cloud of Mount Spurr reached as far as the Cleveland Air Traffic Control Center, approximately 5000 km from the volcano. Schneider et al. (1995) show that Spurr eruption clouds were seen in satellite images as far away as Greenland.
Using picosatellites for 4-D imaging of volcanic clouds: Proof of ...
Jun 1, 2018 · The earliest use of satellite data to estimate ash cloud heights with photogrammetric methods relied on measuring the length of the shadow cast by the cloud under known illumination conditions (Glaze et al., 1989; Prata and Grant, 2001; Simpson et al., 2000; Spinetti et al., 2013). However, more recent approaches, based on photogrammetric ...
Remote Sensing of Volcanic Ash with the GOES-R Series
Jan 1, 2020 · As part of the International Airways Volcano Watch (IAVW) (Lechner et al., 2018), which was created in the aftermath of a nearly catastrophic passenger aircraft encounter with airborne volcanic ash (Miller and Casadevall, 2000), Volcanic Ash Advisory Centers (VAACs) are responsible for issuing volcanic ash advisories to the aviation community in a 24/7 capacity.
A new view of the dynamics, stability and longevity of volcanic …
Apr 1, 2012 · Gravitational instabilities observed at the base of the umbrella cloud associated with the eruption of (A) Mount Saint Helens on 18 May 1980 (photograph by T. Thomson); (B) Mount Augustine on 27 March 1986 (photograph by J. Pezzenti Jr.); (C) Monserrat volcano in September 1997 (photograph by C. Bonadonna); (D) Mount Redoubt on 21 April 1990 ...