@article{fdi:010089470,
  title = {{A} 1000-year record of paleoclimate and paleoenvironment change inferred from sedimentary organic matter in {L}ake {A}zuei, {H}aiti},
  author = {{N}oncent, {D}. and {S}ifeddine, {A}bdelfettah and {E}mmanuel, {E}. and {C}ormier, {M}. {H}. and {B}riceño-{Z}uluaga, {F}. {J}. and {V}ald{\'e}s, {J}. and {M}endez-{M}illan, {M}ercedes and {T}urcq, {B}runo and {B}ernal, {J}. {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e studied sediment organic matter ({OM}) to reconstruct the environment over the last millennium using a sediment core from {L}ake {A}zuei, {H}aiti, also known as "{E}tang {S}aumatre." {C}hronology for the 84-cm-long core was established with 11 14{C} dates and 210{P}b analysis. {T}otal organic carbon ({TOC}) concentrations in the sediment were low (0.58 - 4.89%), as were total nitrogen ({TN}) values (0.06 - 0.40%). {C}arbon isotopic ratio (delta 13{C}) values were relatively negative and {C}/{N} ratios were low, suggesting that algae and terrestrial {C}3 plants were the primary sources of {OM} in the lake sediment. {T}he inverse relationship between the nitrogen isotopic ratio (delta 15{N}) and {TOC} is related to denitrification in the sediment. {W}e identified five stratigraphic zones using a delta 13{C} vs. {C}/{N} cross diagram: 1) {M}edieval {C}limate {A}nomaly 1 ({MCA}1) (1000-1050 {CE}), 2) {M}edieval {C}limate {A}nomaly 2 ({MCA}2) (1050-1100 {CE}), 3) {T}ransition period between {M}edieval {C}limate {A}nomaly and {L}ittle {I}ce {A}ge ({MCA}-{LIA}) (1150-1400 {CE}) 4) {L}ittle {I}ce {A}ge ({LIA}) (1400-1800 {CE}), 5) {C}urrent {W}arm {P}eriod ({CWP}) (1800-2000 {CE}). {T}hese stratigraphic zones correspond to three climate episodes. {T}he first was applied {MCA}1 and {LIA} periods, when there was a decrease in {TOC} and {TN} as well as in plankton-derived {OM}. {T}his was accompanied by an increase in delta 15{N}, which suggests denitrification due to suboxic conditions, likely caused by an increase in lake water temperature and dry conditions. {T}he second climate episode was the {MCA}-{LIA} transition period and was characterized by high variability of {TOC}, delta 13{C} and delta 15{N}. {T}he organic matter deposited during this period appeared to be a mixture of material originating from both autochthonous phytoplankton and allochthonous {C}3 plants. {T}here was climate instability during this period, with alternations between wet and dry conditions, and thus likely variations in lake level. {T}he third climate episode, the {MCA}2 and {CWP} periods, was characterized by an increase in {TOC} and {TN} values, and decrease in delta 13{C} and delta 15{N} values. {T}his was chiefly attributable to more organic material input which was derived from {C}3 terrestrial vegetation growing around the lake. {A} decrease in delta 15{N} indicated a reduction in denitrification, further suggesting an increase in the input of organic matter. {S}edimentation during these periods occurred when there was more transport related to wet conditions.},
  keywords = {{S}ediment organic matter ; {P}aleoenvironment ; {P}aleoclimate ; {HAITI}},
  booktitle = {},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {632},
  numero = {},
  pages = {111845 [9 ]},
  ISSN = {0031-0182},
  year = {2023},
  DOI = {10.1016/j.palaeo.2023.111845},
  URL = {https://www.documentation.ird.fr/hor/fdi:010089470},
}