@article{fdi:010066804,
  title = {{C}alibration of speleothem delta {O}-18 records against hydroclimate instrumental records in {C}entral {B}razil},
  author = {{M}oquet, {J}. {S}. and {C}ruz, {F}. {W}. and {N}ovello, {V}. {F}. and {S}trikis, {N}. {M}. and {D}eininger, {M}. and {K}armann, {I}. and {S}antos, {R}. {V}. and {M}illo, {C}. and {A}paestegui, {J}. and {G}uyot, {J}ean-{L}oup and {S}ifeddine, {A}bdelfettah and {V}uille, {M}. and {C}heng, {H}. and {E}dwards, {R}. {L}. and {S}antini, {W}illiam},
  editor = {},
  language = {{ENG}},
  abstract = {delta {O}-18 in speleothems is a powerful proxy for reconstruction of precipitation patterns in tropical and sub-tropical regions. {T}he aim of this study is to calibrate the delta {O}-18 record of speleothems against historical precipitation and river discharge data in central {B}razil, a region directly influenced by the {S}outhern {A}tlantic {C}onvergence {Z}one ({SACZ}), a major feature of the {S}outh {A}merican {M}onsoon {S}ystem ({SAMS}). {T}he present work is based on a sub annual resolution speleothem record covering the last 141 years (the period between the years 1870 and 2011) from a cave in central {B}razil. {T}he comparison of this record with instrumental hydroclimate records since 1921 allows defining a strong relationship between precipitation variability and stable oxygen isotope ratios from speleothems. {T}he results from a monitoring program of climatic parameters and isotopic composition of rainfall and cave seepage waters performed in the same cave, show that the rain delta {O}-18 variability is dominated by the amount effect in this region, while delta {O}-18 drip water remains almost constant over the monitored period (1.5 years). {T}he delta {O}-18 of modern calcite, on the other hand, shows clear seasonal variations, with more negative values observed during the rainy season, which implies that other factors also influence the isotopic composition of carbonate. {H}owever, the relationship between delta {O}-18 of carbonate deposits and rainwater is supported by the results from the comparison between speleothem delta {O}-18 records and historical hydroclimate records. {A} significant correlation between speleothem delta {O}-18 and monsoon rainfall variability is observed on sub-decadal time scales, especially for the monsoon period ({DJFM} and {NDJFM}), once the rainfall record have been smoothed with a 7-9 years running mean. {T}his study confirms that speleothem delta {O}-18 is directly associated with monsoon rainfall variability in central {B}razil. {T}he relationship between speleothem delta {O}-18 records and hydroclimatic historical records allows approximation of the absolute changes in mean annual rainfall during the last millennia in the {SACZ}/{SAMS} domain.},
  keywords = {{S}peleothem ; {C}limate calibration ; {S}table isotopes ; {SAMS}-{SACZ} ; {C}entral {B}razil ; {BRESIL}},
  booktitle = {},
  journal = {{G}lobal and {P}lanetary {C}hange},
  volume = {139},
  numero = {},
  pages = {151--164},
  ISSN = {0921-8181},
  year = {2016},
  DOI = {10.1016/j.gloplacha.2016.02.001},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066804},
}