@article{fdi:010063596,
  title = {{A} late {H}olocene paleoclimate reconstruction from {B}oqueirao {L}ake sediments, northeastern {B}razil},
  author = {{V}iana, {J}. {C}. {C}. and {S}ifeddine, {A}bdelfettah and {T}urcq, {B}runo and {A}lbuquerque, {A}. {L}. {S}. and {M}oreira, {L}. {S}. and {G}omes, {D}. {F}. and {C}ordeiro, {R}. {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{L}ake level fluctuations and environmental changes during the late {H}olocene were inferred from changes in sedimentology, bulk and isotope organic geochemistry, and a diatom based transfer function in a sediment core from {B}oqueirao {L}ake, northeast {B}razil. {T}he age-depth model was established using fifteen {AMS} {C}-14 dates. {L}ake water level began increasing about {AD} 400, and reached its maximum during the {M}edieval {C}limate {A}nomaly ({MCA}), {AD} similar to 900-1100. {L}ow lake water level was recorded during the {L}ittle {I}ce {A}ge ({LIA}), {AD} similar to 1400-1820, which allowed macrophyte development in the littoral zone that was recorded by high {C}-org/{N}-total ratios. {C}onsiderable lake level variability was evident during the {C}urrent {W}arm {P}eriod ({CWP}). {H}umid/dry conditions in northeast {B}razil during {MCA}/{LIA}, respectively, are related to the southward shift of {I}nter-{T}ropical {C}onvergence {Z}one ({ITCZ}) during austral summer and fall. {T}hose conditions contrast with records of a decrease/increase in the {S}outh {A}merican {S}ummer {M}onsoon ({SASM}) during these periods. {T}his observation also contrasts with paleoclimate inferences from the circum-{C}aribbean region indicating a northward shift of the {ITCZ} northern hemisphere summer position during the {MCA} and a southward shift during the {LIA}. {W}e suggest that these shifts in {ITCZ} seasonality were higher during the {MCA} and smaller during the {LIA}. {O}ur aim was to answer whether the zonal atmospheric circulation cell between the {A}mazon and northeast {B}razil was responsible for antiphasing with the {SASM}. {A} strong monsoon over {S}outh {A}merica during the {LIA} reinforced convection upon {A}mazon, increasing the northeast low in the upper troposphere and large-scale subsidence over northeast {B}razil and the {A}tlantic {O}cean leading to a northward repositioning of the {S}outh {A}tlantic {S}ubtropical {A}nticyclone. {T}hese factors in combination may have limited the southward seasonal shift of {ITCZ}, and they must have been responsible for drier conditions in northeast {B}razil during the {LIA}.},
  keywords = {{D}iatom-based transfer function ; {L}ake level ; {ITCZ} ; {MCA} ; {LIA} ; {BRESIL} ; {ATLANTIQUE}},
  booktitle = {{C}ontinental and coastal marine records of centennial to millennial changes in {S}outh {A}merican climate since the last glacial maximum},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {415},
  numero = {no sp{\'e}cial},
  pages = {117--126},
  ISSN = {0031-0182},
  year = {2014},
  DOI = {10.1016/j.palaeo.2014.07.010},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063596},
}