HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Journal articles

Spectral Emissivity of Phonolite Lava at High Temperature

Abstract : The rheology and thermodynamical evolution of magma, either in reservoirs, conduits or at the surface, are governed by temperature. To determine the field temperature, remote sensing methods based on measuring the infrared radiance are widely applied, but they are subject to assumptions and caveats that can propagate into large uncertainties. This is related to the poor knowledge of one of the most critical parameters, namely the spectral emissivity. In this work we aim at filling this gap through in situ spectral emissivity measurements performed over wide temperature (700-1600 K) and spectral ranges (1.25-25 µm) on two representative phonolitic compositions from Erebus (Antartica) and Teide (Spain) volcanoes. The laboratory spectra allow to determine precisely spectral emissivity in the thermal infrared (TIR), middle infrared (MIR), and shortwave infrared (SWIR) ranges. The results reveal the complexity and contrasted behavior of the radiative properties of the two rocks melts, despite their broadly similar composition. The spectral emissivity varies significantly as a function of temperature, composition, crystallinity, thickness, and thermal history. Altogether, the data reveal that emissivity cannot be considered as a constant value and question previous arguments that active lava always has lower emissivity than frozen lava. Finally, the laboratory-measured values of spectral emissivity were used to refine the temperature of Erebus lava lake gathered from previous remote sensing methods.
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03433900
Contributor : Nathalie Pothier Connect in order to contact the contributor
Submitted on : Thursday, November 18, 2021 - 7:42:13 AM
Last modification on : Tuesday, May 10, 2022 - 3:25:02 PM
Long-term archiving on: : Saturday, February 19, 2022 - 6:17:04 PM

File

FINAL_VERSION-IEEE-2021.pdf
Files produced by the author(s)

Identifiers

Collections

Citation

Hao Li, Joan Andujar, Aneta Slodczyk, Domingos de Sousa Meneses, Bruno Scaillet, et al.. Spectral Emissivity of Phonolite Lava at High Temperature. IEEE Transactions on Geoscience and Remote Sensing, Institute of Electrical and Electronics Engineers, 2022, 60, pp.1-15. ⟨10.1109/TGRS.2021.3104657⟩. ⟨insu-03433900⟩

Share

Metrics

Record views

76

Files downloads

53