@article{fdi:010073958,
  title = {{I}nfluence of eruptive style on volcanic gas emission chemistry and temperature},
  author = {{O}ppenheimer, {C}. and {S}caillet, {B}. and {W}oods, {A}. and {S}utton, {A}. {J}. and {E}lias, {T}. and {M}oussallam, {Y}ves},
  editor = {},
  language = {{ENG}},
  abstract = {{G}as bubbles form as magmas ascend in the crust and exsolve volatiles. {T}hese bubbles evolve chemically and physically as magma decompression and crystallization proceed. {I}t is generally assumed that the gas remains in thermal equilibrium with the melt but the relationship between gas and melt redox state is debated. {H}ere, using absorption spectroscopy, we report the composition of gases emitted from the lava lake of {K}ilauea {V}olcano, {H}awaii, and calculate equilibrium conditions for the gas emissions. {O}ur observations span a transition between more and less vigorous-degassing regimes. {T}hey reveal a temperature range of up to 250 degrees {C}, and progressive oxidation of the gas, relative to solid rock buffers, with decreasing gas temperature. {W}e suggest that these phenomena are the result of changing gas bubble size. {W}e find that even for more viscous magmas, fast-rising bubbles can cool adiabatically, and lose the redox signature of their associated melts. {T}his process can result in rapid changes in the abundances of redox-sensitive gas species. {G}as composition is monitored at many volcanoes in support of hazard assessment but time averaging of observations can mask such variability arising from the dynamics of degassing. {I}n addition, the observed redox decoupling between gas and melt calls for caution in using lava chemistry to infer the composition of associated volcanic gases.},
  keywords = {{HAWAII} ; {KILAUEA} {VOLCAN} {LAC}},
  booktitle = {},
  journal = {{N}ature {G}eoscience},
  volume = {11},
  numero = {9},
  pages = {678--681 + 2 p.},
  ISSN = {1752-0894},
  year = {2018},
  DOI = {10.1038/s41561-018-0194-5},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073958},
}