@article{fdi:010079804,
  title = {{I}ntegrated borehole, radar, and seismic velocity analysis reveals dynamic spatial variations within a firn aquifer in southeast {G}reenland},
  author = {{K}illingbeck, {S}. {F}. and {S}chmerr, {N}. {C}. and {M}ontgomery, {L}. {N}. and {B}ooth, {A}. {D}. and {L}ivermore, {P}. {W}. and {G}uandique, {J}. and {M}iller, {O}. {L}. and {B}urdick, {S}. and {F}orster, {R}. {R}. and {K}oenig, {L}. {S}. and {L}egchenko, {A}natoli and {L}igtenberg, {S}. {R}. {M}. and {M}iege, {C}. and {S}olomon, {D}. {K}. and {W}est, {L}. {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}erennial water storage in firn aquifers has been observed within the lower percolation zone of the southeast {G}reenland ice sheet. {S}patially distributed seismic and radar observations, made similar to 50 km upstream of the {H}elheim {G}lacier terminus, reveal spatial variations of seismic velocity within a firn aquifer. {F}rom 1.65 to 1.8 km elevation, shear-wave velocity ({V}s) is 1,290 +/- 180 m/s in the unsaturated firn, decreasing below the water table (similar to 15 m depth) to 1,130 +/- 250 m/s. {B}elow 1.65 km elevation,{V}sin the saturated firn is 1,270 +/- 220 m/s. {T}he compressional-to-shear velocity ratio decreases in the downstream saturated zone, from 2.30 +/- 0.54 to 2.01 +/- 0.46, closer to its value for pure ice (2.00). {C}onsistent with colocated firn cores, these results imply an increasing concentration of ice in the downstream sites, reducing the porosity and storage potential of the firn likely caused by episodic melt and freeze during the evolution of the aquifer.},
  keywords = {seismic ; firn aquifer ; {G}reenland ; {GROENLAND}},
  booktitle = {},
  journal = {{G}eophysical {R}esearch {L}etters},
  volume = {47},
  numero = {18},
  pages = {e2020{GL}089335 [10 p.]},
  ISSN = {0094-8276},
  year = {2020},
  DOI = {10.1029/2020gl089335},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079804},
}