@article{fdi:010092556,
  title = {{A} promising location in {P}atagonia for paleoclimate and paleoenvironmental reconstructions revealed by a shallow firn core from {M}onte {S}an {V}alentin ({N}orthern {P}atagonia {I}cefield, {C}hile)},
  author = {{V}imeux, {F}ran{\c{c}}oise and {A}ngelis de, {M}. and {G}inot, {P}atrick and {M}agand, {O}. and {C}asassa, {G}. and {P}ouyaud, {B}ernard and {F}alourd, {S}. and {J}ohnsen, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he study of past climate variability from ice core investigations has been largely developed both in polar areas over the past decades and, more recently, in tropical regions, specifically along the {S}outh {A}merican {A}ndes between 0 degrees and 20 degrees {S}. {H}owever a large gap still remains at mid-latitudes in the {S}outhern {H}emisphere. {I}n this framework, a 15.3-m long shallow firn core has been extracted in {M}arch 2005 from the summit plateau of {M}onte {S}an {V}alentin (3747 m, 46 degrees 35'{S}, 73 degrees 19'{W}) in the {N}orthern {P}atagonia {I}cefield to test its potential for paleoclimate and paleoenvironmental reconstructions. {T}he firn temperature is -11.9 degrees {C} at 10-m depth allowing to expect well preserved both chemical and isotopic signals, unperturbed by water percolation. {T}he dating of the core, on the basis of a multi-proxy approach combining annual layer counting and radionuclide measurements, shows that past environment and climate can be reconstructed back to the mid-1960s. {A} mean annual snow accumulation rate of 36 +/- 3 cm year(-1) (i.e., 19 +/- 2 g cm(-2) year(-1)) is inferred, with a snow density varying between 0.35 and 0.6 g cm(-3), which is much lower than accumulation rates previously reported in {P}atagonia at lower elevations. {H}ere, we present and discuss high-resolution profiles of the isotopic composition of the snow and selected chemical markers. {T}hese data provide original information on environmental conditions prevailing over {S}outhern {P}atagonia in terms of air masses trajectories and origins and biogeochemical reservoirs. {O}ur main conclusion is that the {S}an {V}alentin site is not only influenced by air masses originating from the southern {P}acific and directly transported by the prevailing west winds but also by inputs from {S}outh {A}merican continental sources from the {E}-{NE}, sometimes mixed with circumpolar aged air masses, the relative influence of these two very distinct source areas changing at the interannual timescale. {T}hus this site should offer a wealth of information regarding ({S}outh) {P}acific, {A}rgentinian {NE}-{E} areas and {A}ntarctic climate variability.},
  keywords = {{CHILI} ; {PACIFIQUE} ; {PATAGONIE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch-{A}tmospheres},
  volume = {113},
  numero = {{D}16},
  pages = {en ligne [20 ]},
  ISSN = {0148-0227},
  year = {2008},
  DOI = {10.1029/2007{JD}009502},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092556},
}