Using Himawari-8, estimation of SO2 cloud altitude at Aso volcano eruption, on October 8, 2016
Autor: | Toshiki Shimbori, Yuta Hayashi, Kensuke Ishii |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
Volcanic hazards
010504 meteorology & atmospheric sciences Himawari-8 Aso volcano lcsh:Geodesy Cloud computing SO2 010502 geochemistry & geophysics Atmospheric sciences 01 natural sciences Altitude Phreatomagmatic eruption 0105 earth and related environmental sciences geography lcsh:QB275-343 geography.geographical_feature_category business.industry lcsh:QE1-996.5 lcsh:Geography. Anthropology. Recreation Geology lcsh:Geology Volcano lcsh:G Space and Planetary Science Atmospheric transport model Brightness temperature Geostationary orbit Ash RGB Environmental science business Volcanic ash |
Zdroj: | Earth, Planets and Space, Vol 70, Iss 1, Pp 1-9 (2018) |
ISSN: | 1880-5981 |
Popis: | It is vital to detect volcanic plumes as soon as possible for volcanic hazard mitigation such as aviation safety and the life of residents. Himawari-8, the Japan Meteorological Agency’s (JMA’s) geostationary meteorological satellite, has high spatial resolution and sixteen observation bands including the 8.6 μm band to detect sulfur dioxide (SO2). Therefore, Ash RGB composite images (RED: brightness temperature (BT) difference between 12.4 and 10.4 μm, GREEN: BT difference between 10.4 and 8.6 μm, BLUE: 10.4 μm) discriminate SO2 clouds and volcanic ash clouds from meteorological clouds. Since the Himawari-8 has also high temporal resolution, the real-time monitoring of ash and SO2 clouds is of great use. A phreatomagmatic eruption of Aso volcano in Kyushu, Japan, occurred at 01:46 JST on October 8, 2016. For this eruption, the Ash RGB could detect SO2 cloud from Aso volcano immediately after the eruption and track it even 12 h after. In this case, the Ash RGB images every 2.5 min could clearly detect the SO2 cloud that conventional images such as infrared and split window could not detect sufficiently. Furthermore, we could estimate the height of the SO2 cloud by comparing the Ash RGB images and simulations of the JMA Global Atmospheric Transport Model with a variety of height parameters. As a result of comparison, the top and bottom height of the SO2 cloud emitted from the eruption was estimated as 7 and 13–14 km, respectively. Assuming the plume height was 13–14 km and eruption duration was 160–220 s (as estimated by seismic observation), the total emission mass of volcanic ash from the eruption was estimated as 6.1–11.8 × 108 kg, which is relatively consistent with 6.0–6.5 × 108 kg from field survey. |
Databáze: | OpenAIRE |
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