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Spaceborne EO and a combination of inverse and forward modelling for monitoring lava flow advance.

Rogic, N. and Cappello, A. and Ganci, G. and Maturilli, Alessandro and Rymer, H. and Blake, S. and Ferrucci, F. (2019) Spaceborne EO and a combination of inverse and forward modelling for monitoring lava flow advance. Remote Sensing, 11 (24), p. 3032. Multidisciplinary Digital Publishing Institute (MDPI). DOI: 10.3390/rs11243032 ISSN 2072-4292

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Official URL: https://www.mdpi.com/journal/remotesensing/special_issues/volcano_rs

Abstract

Spectral emissivity is a seldom measured parameter, and it is generally assumed to be a constant. However, by ignoring the variation of emissivity with temperature for spaceborne data and modelling applications, we demonstrate that substantial uncertainties in determination of land surface temperatures (LST) are introduced. Errors in computation of lava surface temperature consequently produce errors in radiant fluxes and forecasted lava flow lengths. We aim here to improve the understanding of the relationship between emissivity and temperature by carrying out a multi-stage experiment for the 2017 Mt Etna (Italy) eruption, by combining laboratory and spaceborne and numerical modelling data. Our laboratory-based Fourier Transform Infra-red (FTIR) results indicate that emissivity and temperature are inversely correlated, which supports the argument that emissivity of molten material is significantly lower than that of the same material in its solid state. Recent research suggests that emissivity of molten lava may be as low as 0.60. Our forward-modelling tests using MAGFLOW Cellular Automata suggest that a 35% emissivity variation (0.95 to 0.60) can produce up to 46% overestimation in simulated/forecasted lava flow lengths (compared to actual observed). In comparison, our simulation using a ‘two-component’ emissivity approach compares well with the actual 2017 lava flow lengths. We evaluated the influence of variable emissivity on lava surface temperatures using spaceborne data by performing several parametrically controlled assessments, using both constant (‘uniform’) and a ‘two-component’ emissivity approach (i.e. for melt and cooled lava). Computed total radiant fluxes, using the same spaceborne scene (Landsat 8), indicate a ≤15 % difference between emissivity endmembers (i.e. 0.95 and 0.60). These results further suggest a radiant flux variation/uncertainty bordering at lower boundary values of the moderate-to-high temporal resolution spaceborne data (MODIS & SEVIRI), acquired for the same target area (and the same time interval). These findings may have considerable impact on civil protection decisions made during volcanic crisis involving lava flows as they approach protected or populated areas.

Item URL in elib:https://elib.dlr.de/131991/
Document Type:Article
Additional Information:Bisher nur online erschienen.
Title:Spaceborne EO and a combination of inverse and forward modelling for monitoring lava flow advance.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Rogic, N.Open UniversityUNSPECIFIED
Cappello, A.INGVUNSPECIFIED
Ganci, G.INGVUNSPECIFIED
Maturilli, AlessandroAlessandro.Maturilli (at) dlr.dehttps://orcid.org/0000-0003-4613-9799
Rymer, H.Open UniversityUNSPECIFIED
Blake, S.Open UniversityUNSPECIFIED
Ferrucci, F.School of Environment, Earth and Ecosystem Sciences, The Open University, Milton Keynes MK7 6AA, UK; Department of Environmental and Chemical Engineering, University of Calabria, 87036 Rende (CS), ItalyUNSPECIFIED
Date:16 December 2019
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.3390/rs11243032
Page Range:p. 3032
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2072-4292
Status:Published
Keywords:remote sensing, volcanic hazard modelling, emissivity uncertainty, FTIR spectroscopy, Mount Etna.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Projekt BepiColombo MERTIS und BELA
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Maturilli, Dr. Alessandro
Deposited On:17 Dec 2019 07:57
Last Modified:17 Dec 2019 07:57

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