@article{fdi:010085365,
  title = {{R}adon signature of {CO}2 flux constrains the depth of degassing : {F}urnas volcano ({A}zores, {P}ortugal) versus {S}yabru-{B}ensi ({N}epal {H}imalayas)},
  author = {{G}irault, {F}. and {V}iveiros, {F}. and {S}ilva, {C}. and {T}hapa, {S}. and {P}acheco, {J}. {E}. and {A}dhikari, {L}. {B}. and {B}hattarai, {M}. and {K}oirala, {B}. {P}. and {A}grinier, {P}. and {F}rance-{L}anord, {C}. and {Z}anon, {V}. and {V}andemeulebrouck, {J}. and {B}yrdina, {S}vetlana and {P}errier, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ubstantial terrestrial gas emissions, such as carbon dioxide ({CO}2), are associated with active volcanoes and hydrothermal systems. {H}owever, while fundamental for the prediction of future activity, it remains difficult so far to determine the depth of the gas sources. {H}ere we show how the combined measurement of {CO}2 and radon-222 fluxes at the surface constrains the depth of degassing at two hydrothermal systems in geodynamically active contexts: {F}urnas {L}ake {F}umarolic {F}ield ({FLFF}, {A}zores, {P}ortugal) with mantellic and volcano-magmatic {CO}2, and {S}yabru-{B}ensi {H}ydrothermal {S}ystem ({SBHS}, {C}entral {N}epal) with metamorphic {CO}2. {A}t both sites, radon fluxes reach exceptionally high values (> 10 {B}q m(-2) s(-1)) systematically associated with large {CO}2 fluxes (> 10 kg m(-2) day(-1)). {T}he significant radon-{CO}2 fluxes correlation is well reproduced by an advective-diffusive model of radon transport, constrained by a thorough characterisation of radon sources. {E}stimates of degassing depth, 2580 +/- 180 m at {FLFF} and 380 +/- 20 m at {SBHS}, are compatible with known structures of both systems. {O}ur approach demonstrates that radon-{CO}2 coupling is a powerful tool to ascertain gas sources and monitor active sites. {T}he exceptionally high radon discharge from {FLFF} during quiescence (approximate to 9 {GB}q day(-1)) suggests significant radon output from volcanoes worldwide, potentially affecting atmosphere ionisation and climate.},
  keywords = {{PORTUGAL} ; {NEPAL} ; {HIMALAYA} ; {ACORES} ; {FURNAS} {VOLCAN}},
  booktitle = {},
  journal = {{S}cientific {R}eports - {N}ature},
  volume = {12},
  numero = {1},
  pages = {10837 [16 ]},
  ISSN = {2045-2322},
  year = {2022},
  DOI = {10.1038/s41598-022-14653-5},
  URL = {https://www.documentation.ird.fr/hor/fdi:010085365},
}