@article{fdi:010058164,
  title = {{L}ate {H}olocene paleoenvironmental changes in {N}ortheast {B}razil recorded by organic matter in lacustrine sediments of {L}ake {B}oqueirao},
  author = {{Z}ocatelli, {R}. and {T}urcq, {B}runo and {B}oussafir, {M}. and {C}ordeiro, {R}. {C}. and {D}isnar, {J}. {R}. and {C}osta, {R}. {L}. and {S}ifeddine, {A}bdelfettah and {A}lbuquerque, {A}.{L}.{S}. and {B}ernardes, {M}.{C}. and {J}acob, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{N}ortheast {B}razil represents a key area in terms of {H}olocene environmental changes in {S}outh {A}merica due to its distinct semi-arid climate at near equatorial latitudes as well as to a wetter {E}arly and {M}iddle {H}olocene paleoclimate in comparison with other {S}outh {A}merica regions, which also experienced a reduced monsoon at that time. {W}e studied the lacustrine sediments of {L}ake {B}oqueirao, which is located at 5 degrees {S} latitude on the {B}razilian {A}tlantic coast; it is directly influenced by displacement of the {I}ntertropical {C}onvergence {Z}one ({ITCZ}). {A} short (1 m) core "{B}oqc0701" was collected at a 7.5 m water depth during a seismic survey. {O}rganic matter ({OM}) geochemical [{R}ock-{E}val {T}otal {O}rganic {C}arbon ({TOC}), {H}ydrogen {I}ndex ({HI}), {O}xygen {I}ndex ({OI})] and petrographical studies allowed us to distinguish five sedimentary intervals during the last 3 kyr. {P}hase {E} (3000 to 2050 cal yr {BP}) presents the largest {TOC}, {HI} and {OI} fluctuations in the entire core. {T}he most probable cause of these variations is a great instability in the lake level during this period. {P}hase {D} (2050 to 1830 cal yr {BP}) is marked by an increase in sedimentation rate and a higher contribution from a well-preserved {OM} with an algal origin; this was interpreted as a higher and more stable lake level. {D}uring phase {C} (1830 to 1550 cal yrs {BP}), low {HI} and high {OI} indicate the input of more oxidized, degraded and detrital {OM}, reflecting a lower lake level. {I}n phase {B} (1550 to 1470 cal yr {BP}), the {OM} quality and quantity ({HI} and {TOC}) indicate an algal contribution. {D}uring phase {A} (1470 to 570 cal yr {BP}), the high stability of the proxies may be due to a deep environment where {OM} fluctuations are strongly buffered. {T}hese changes in lake level can be compared with other tropical {S}outh {A}merica high resolution records. {A} correspondence seems to exist between phases of low {ENSO}. cool {N}orth {A}tlantic {O}cean and {B}oqueirao wet phases. {W}e did not encounter this same pattern during the last 1050 years, during which the 1050-570 cal yrs {BP} interval was generally wet (although probable fluctuations are buffered in our proxies) while the {N}orth {A}tlantic was warm ({M}ann et al., 2009). {A} prolonged dryness occurred in take {B}oqueirao from 570 cal yrs {BP} until recent decades. {T}his phase corresponds to the {L}ittle {I}ce {A}ge characterized by a cooler {N}orth {A}tlantic {O}cean ({M}ann et al., 2009). {T}hese data indicate that the teleconnection pattern between the tropical {A}tlantic. {ENSO} and {N}ortheast {B}razil rainfalls has changed in the past.},
  keywords = {{R}ock-{E}val ; {O}rganic petrography ; {M}acrophytes ; {A}lgal ; {I}ntertropical convergence ; {BRESIL}},
  booktitle = {},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {363},
  numero = {},
  pages = {127--134},
  ISSN = {0031-0182},
  year = {2012},
  DOI = {10.1016/j.palaeo.2012.08.021},
  URL = {https://www.documentation.ird.fr/hor/fdi:010058164},
}