@article{fdi:010053192,
  title = {{M}arine sediments from southeastern {B}razilian continental shelf : a 1200 year record of upwelling productivity},
  author = {{S}outo, {D}. {D}. and {L}essa, {D}. {V}. {D}. and {A}lbuquerque, {A}. {L}. {S}. and {S}ifeddine, {A}bdelfettah and {T}urcq, {B}runo and {B}arbosa, {C}. {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} sediment core from the {C}abo {F}rio coastal shelf (-23.19 {S}, -41.8 {W}; 117 m depth), was analyzed for {TOC}, {C}/{N} ratio, organic petrography and planktonic foraminiferal content to evaluate variations in local productivity caused by changes in upwelling intensity and its relation to regional and global climatic variations during the last millennium. {T}he {C}abo {F}rio core recorded the last 1200 years of sedimentation, with rates varying from 0.11 to 0.32 mm yr(-1). {F}oraminiferal and organic geochemical analyses indicate the occurrence of three distinct periods of productivity. {F}rom 850 {AD} until 1070 {AD}, foraminifera fluxes consisting primarily of {T}urborotalita quinqueloba indicate stronger {S}outh {A}tlantic {C}entral {W}ater ({SACW}) transport onto the shelf, which induced high biological productivity that was also recorded by high {TOC} and marine palynomorphs content and a low {C}/{N} atomic ratio. {T}his period coincided with a northward displacement of the atmospheric {I}ntertropical {C}onvergence {Z}one ({ITCZ}) and {S}outh {A}tlantic {H}igh ({SAH}) systems driven by positive temperature anomalies in the {N}orth {A}tlantic {O}cean during the {M}edieval {C}limate {A}nomaly ({MCA}). {F}rom 1070 until 1500 {AD}, low {TOC} flux and planktonic foraminifera fluxes and high {C}/{N} atomic ratios suggest a reduction in marine productivity, probably driven by reduced transport of {SACW} associated with the southward displacement of the {SAH} and weakening of northeasterly winds. {T}he period between 1500 and 1830 {AD}, which corresponds to the {L}ittle {I}ce {A}ge, is marked by increased fluxes of planktonic foraminifera, principally of {G}lobigerina bulloides and {G}lobigerinita glutinata. {T}hese species mark an increase in productivity linked to {SACW} upwelling, supported by the enhancement of northeasterly winds and southward displacement of the {ITCZ} and {SAH}.},
  keywords = {{P}lanktonic foraminifera ; {O}rganic geochemistry ; {P}aleoproductivity ; {L}ast millennium ; {S}outhwestern {A}tlantic ; {B}razil},
  booktitle = {},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {299},
  numero = {1-2},
  pages = {49--55},
  ISSN = {0031-0182},
  year = {2011},
  DOI = {10.1016/j.palaeo.2010.10.032},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053192},
}