# Thermal Radiative Properties of Bardarbunga Basalts: Importance of Emissivity in Magma Rheology and Volcanic Hazard.

Jonas Biren, Lionel Cosson, Leire del Campo, Cécile Genevois, Emmanuel Veron, Sandra Ory, Hao Li, Joan Andújar, Aneta Slodczyk

<figure><img src="image_1.png" /></figure>

## ► To cite this version:

Jonas Biren, Lionel Cosson, Leire del Campo, Cécile Genevois, Emmanuel Veron, et al.. Thermal Radiative Properties of Bardarbunga Basalts: Importance of Emissivity in Magma Rheology and Volcanic Hazard.. AGU 2021 Fall Meeting, Dec 2021, Online, France. 10.1002/essoar.10509907.1 . insu-03559137

HAL Id: insu-03559137

https://insu.hal.science/insu-03559137

Submitted on 6 Feb 2022

HAL is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_2.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
# Thermal Radiative Properties of Bardarbunga Basalts: Importance of Emissivity in Magma Rheology and Volcanic Hazard

<figure><img src="image_3.png" /></figure>

Jonas Biren<fnref n="1" />*, Aneta Slodczyk<fnref n="1" />,<fnref n="2" />, Lionel Cosson<fnref n="2" />, Leire del Campo<fnref n="2" />, Cécile Genevois<fnref n="2" />, Emmanuel Veron<fnref n="2" />, Sandra Ory<fnref n="2" />, Hao Li<fnref n="1" />, Joan Andújar<fnref n="1" />

V23A-04 - Properties of magmas - 14 December 2021

<footnote n="1">¹CNRS-Université d'Orléans, ISTO, BRGM, UMR 7327, F-45071, Orléans, France.</footnote>

<footnote n="2">²CNRS-Université d'Orléans, CEMHTI, UPR 3079, F-45071, Orléans, France.</footnote>
<figure><img src="image_4.png" /></figure>

<figure><img src="image_5.png" /></figure>

<figure><img src="image_6.png" /></figure>

<figure><img src="image_7.png" /></figure>

<figure><img src="image_8.png" /></figure>

JONAS BIREN

PhD student at ISTO, University of Orléans
- Orléans, France

<figure><img src="image_9.png" /></figure>

<figure><img src="image_10.png" /></figure>

<figure><img src="image_11.png" /></figure>

<figure><img src="image_12.png" /></figure>

UNIVERSITE D'ORLEANS

<figure><img src="image_13.png" /></figure>

SCIENCE
is SOCIETY
<figure><img src="image_14.png" /></figure>

<figure><img src="image_15.png" /></figure>

# TEMPERATURE - KEY PARAMETER TO UNDERSTAND LAVA FLOW RHEOLOGY

Lava flow T retrieved by remote sensing (RS) depends on spectral emissivity ($ε$).

$ε$ poorly known: considered constant or retrieved at RT

Only few studies of $ε$ at relevant magmatic conditions:

* Limited T range (<T$_{g}$) / spectral range (TIR) / composition (synthetic)

<figure><img src="image_16.png" /></figure>

High Temperature and broad spectral range $ε$ data are necessary!

<figure><img src="image_17.png" /></figure>

In situ measurements of $ε$ with FTIR spectrometers up to 1800 K, in SWIR-MIR-TIR

<figure><img src="image_18.png" /></figure>

De Sousa Meneses et al. (2015)
<figure><img src="image_19.png" /></figure>

<figure><img src="image_20.png" /></figure>

SPECTRAL EMISSIVITY BEHAVIOR OF BASALT WITH CRYSTALS

<figure><img src="image_21.png" /></figure>

* ε increases linearly with T in TIR

* ε changes non-linearly with T in SWIR, MIR

* ε highly impacted by crystals content, composition

<figure><img src="image_22.png" /></figure>
<figure><img src="image_23.png" /></figure>

<figure><img src="image_24.png" /></figure>

## IMPLICATION

Andújar and Scalliet (2012)

ε behavior is highly complex

* depends on λ, T, composition, and crystal content
Better constrain on surface radiance

* Refine T by ~50 degrees with RS
More appropriate rheological evolution

* lava flow behavior: from liquidus to subsolidus
Reduce uncertainty in lava flow modeling

* improve hazard assessment

**Poster Hall D-F:** Improving field lava flow temperatures with lab-based spectral emissivities for the 2014–2015 Holuhraun eruption, J. Biren et al., NH25A-0528, *Advances in modelling for natural hazards and risk.* 16:00–18:00

<figure><img src="image_25.png" /></figure>

<figure><img src="image_26.png" /></figure>
THANK YOU

**Looking for a postdoc fellow?**

jonas.biren@cnrs-orleans.fr

https://www.researchgate.net/profile/Jonas_Biren

<figure><img src="image_27.png" /></figure>

La Palma eruption (2021), credit: IGME

AGU

FALL
MEETING

SCIENCE
is SOCIETY