Modeling lava lake heat loss, rheology, and convection

Details Modeling lava lake heat loss, rheology, and convection Modeling lava lake heat loss, rheology, and convection

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3507303h&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 7, CiteID L07303

Physics

9

Volcanology: Effusive Volcanism, Volcanology: Lava Rheology And Morphology, Volcanology: Eruption Mechanisms And Flow Emplacement, Volcanology: Field Relationships (1090, 3690)

Scientific paper

Measurements at Erta Ale's lava lake and theoretical equations for lake rheology, density driven convection and thermally-driven plume ascent allow the constraint of lake dynamics. Cooling and crystallization expected from surface heat losses imply a viscosity increase from 150 Pa s to 300-1800 Pa s for cooled surface layers. Convection is expected to proceed vigorously under low viscosity conditions driving rapid (0.1-0.4 m s-1) surface motions and sluggishly under moderate-to-high viscosity conditions to drive slower motions (<0.08 m s-1). Convection is likely driven by small (~6 kg m-3) density differences, where surface cooling can influence lake rheology and explain variable rates of surface convective motion.

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