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DOI	10.1016/j.epsl.2019.115903
	Periodic outgassing as a result of unsteady convection in Ray lava lake, Mount Erebus, Antarctica
	Birnbaum J.; Keller T.; Suckale J.; Lev E.
发表日期	2020
ISSN	0012821X
卷号	530
英文摘要	Persistently active lava lakes show continuous outgassing and open convection over years to decades. Ray Lake, the lava lake at Mount Erebus, Ross Island, Antarctica, maintains long-term, near steady-state behavior in temperature, heat flux, gas flux, lake level, and composition. This activity is superposed by periodic small pulses of gas and hot magma every 5-18 min and disrupted by sporadic Strombolian eruptions. The periodic pulses have been attributed to a variety of potential processes including unstable bidirectional flow in the conduit feeding the lake. In contrast to hypotheses invoking a conduit source for the observed periodicity, we test the hypothesis that the behavior could be the result of dynamics within the lake itself, independent of periodic influx from the conduit. We perform numerical simulations of convection in Ray Lake driven by both constant and periodic inflow of gas-rich magma from the conduit to identify whether the two cases have different observational signatures at the surface. Our simulations show dripping diapirs or pulsing plumes leading to observable surface behavior with periodicities in the range of 5-20 min. We conclude that a convective speed faster than the inflow speed can result in periodic behavior without requiring periodicity in conduit dynamics. This finding suggests that the surface behavior of lava lakes might be less indicative of volcanic conduit processes in persistently outgassing volcanoes than previously thought, and that dynamics within the lava lake itself may modify or overprint patterns emerging from the conduit. Beyond its importance for Erebus, this result highlights the need to understand periodic processes emerging at all levels of the volcanic plumbing system in order to interpret surface observations. © 2019 Elsevier B.V.
关键词	bidirectional flow conduit convection Erebus volcano lava lake multi-phase model
英文关键词	Dynamics; Heat convection; Heat flux; Volcanoes; Bi-directional flows; conduit; Multiphase model; Periodic behavior; Periodic process; Steady-state behaviors; Surface observation; Volcanic conduit; Lakes; computer simulation; crater lake; degassing; diapir; flow field; lava; multiphase flow; numerical model; periodicity; volcanic eruption; volcanology; Antarctica; East Antarctica; Mount Erebus; Ross Island
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202492
作者单位	Lamont-Doherty Earth Observatory, Columbia UniversityNY, United States; Stanford UniversityCA, United States
推荐引用方式 GB/T 7714	Birnbaum J.,Keller T.,Suckale J.,et al. Periodic outgassing as a result of unsteady convection in Ray lava lake, Mount Erebus, Antarctica[J],2020,530.
APA	Birnbaum J.,Keller T.,Suckale J.,&Lev E..(2020).Periodic outgassing as a result of unsteady convection in Ray lava lake, Mount Erebus, Antarctica.Earth and Planetary Science Letters,530.
MLA	Birnbaum J.,et al."Periodic outgassing as a result of unsteady convection in Ray lava lake, Mount Erebus, Antarctica".Earth and Planetary Science Letters 530(2020).