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HERO ID
2286223
Reference Type
Journal Article
Title
SO2 as a possible proxy for volcanic ash in aviation hazard avoidance
Author(s)
Sears, TM; Thomas, GE; Carboni, E; Smith, AJA; Grainger, RG
Year
2013
Is Peer Reviewed?
Yes
Journal
Journal of Geophysical Research: Atmospheres
ISSN:
2169-897X
EISSN:
2169-8996
Volume
118
Issue
11
Page Numbers
5698-5709
DOI
10.1002/jgrd.50505
Web of Science Id
WOS:000325212600035
Abstract
Airborne volcanic ash poses a significant danger to aircraft, but is difficult to quantify accurately using satellite data, while sulphur dioxide is much easier to detect accurately, but is much less of a direct hazard to aviation. This paper investigates the reliability of using SO2 as a proxy for the location of volcanic ash, using an SO2 retrieval from the Infrared Atmospheric Sounding Interferometer (IASI) and ash detections from IASI and the Advanced Along Track Scanning Radiometer (AATSR). Using a numerical missed ash fraction applied to the eruptions of Eyjafjallajokull in 2010 and Puyehue-Cordon Caulle in 2011 reveals that the SO2 flag typically misses approximate to 30% of the detectable ash. Furthermore, the missed ash fraction is found to be highly variable, both between the two eruptions and over the course of each eruption, with values of over 80% found on some days. The detection threshold of the AATSR ash flag is also investigated using radiative transfer calculations, allowing the threshold of the IASI flag to be inferred, and these are related to the ash contamination levels.
Keywords
volcanic ash; remote sensing; aviation
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