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Utida, Giselle; Cruz, Francisco W; Etourneau, Johan; Bouloubassi, Ioanna; Schefuß, Enno; Vuille, Mathias; Novello, Valdir Felipe; Prado, Luciana Figueiredo; Sifeddine, Abdelfettah; Klein, Vincent; Zular, André; Viana, João Cláudio Cerqueira; Turcq, Bruno Jean (2019): Boqueirão Lake, Northeastern Brazil 2,300 years dD precipitation reconstruction. PANGAEA, https://doi.org/10.1594/PANGAEA.897505, Supplement to: Utida, Giselle; Cruz, Francisco W; Etourneau, Johan; Bouloubassi, Ioanna; Schefuß, Enno; Vuille, Mathias; Novello, Valdir Felipe; Prado, Luciana Figueiredo; Sifeddine, Abdelfettah; Vincent, Klein; Zular, André; Viana, João Cláudio Cerqueira; Turcq, Bruno Jean (2019): Tropical South Atlantic influence on Northeastern Brazil precipitation and ITCZ displacement during the past 2300 years. Scientific Reports, 9(1), 1698, https://doi.org/10.1038/s41598-018-38003-6

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Abstract:
Recent paleoclimatic studies suggest that changes in the tropical rainbelt across the Atlantic Ocean during the past two millennia are linked to a latitudinal shift of the Intertropical Convergence Zone (ITCZ) driven by the Northern Hemisphere (NH) climate. However, little is known regarding other potential drivers that can affect tropical Atlantic rainfall, mainly due to the scarcity of adequate and high-resolution records. In this study, we fill this gap by reconstructing precipitation changes in Northeastern Brazil during the last 2,300 years from a high-resolution lake record of hydrogen isotope compositions of plant waxes from the core Boqc0901 dated by Viana et al . (2014). We present isotope carbon and hydrogen plant waxes of n-C28 alkanoic acid, the percentage of C3 plants and hydrogen isotope reconstruction of precipitation. We find that regional precipitation along the coastal area of South America was not solely governed by north-south displacements of the ITCZ due to changes in NH climate, but also by the contraction and expansion of the tropical rainbelt due to variations in sea surface temperature and southeast trade winds in the tropical South Atlantic Basin.
Keyword(s):
hydrogen; isotopes; last millenia; Plant wax
Further details:
Gomes, Doriedson Ferreira; Albuquerque, Ana Luiza Spadano; Torgan, L C; Turcq, Bruno Jean; Sifeddine, Abdelfettah (2014): Assessment of a diatom-based transfer function for the reconstruction of lake-level changes in Boqueirão Lake, Brazilian Nordeste. Palaeogeography, Palaeoclimatology, Palaeoecology, 415, 105-116, https://doi.org/10.1016/j.palaeo.2014.07.009
Viana, João Cláudio Cerqueira; Sifeddine, Abdelfettah; Turcq, Bruno Jean; Albuquerque, Ana Luiza Spadano; Moreira, Luciane Silva; Gomes, Doriedson Ferreira; Cordeiro, Renato Campello (2019): (Table 1) Description of radiocarbon ages obtained on organic matter from bulk sediment of Boqc0901 core (Boqueirão Lake) by AMS Method. PANGAEA, https://doi.org/10.1594/PANGAEA.897629
Viana, João Cláudio Cerqueira; Sifeddine, Abdelfettah; Turcq, Bruno Jean; Albuquerque, Ana Luiza Spadano; Moreira, Luciane Silva; Gomes, Doriedson Ferreira; Cordeiro, Renato Campello (2014): A late Holocene paleoclimate reconstruction from Boqueirão Lake sediments, northeastern Brazil. Palaeogeography, Palaeoclimatology, Palaeoecology, 415, 117-126, https://doi.org/10.1016/j.palaeo.2014.07.010
Zocatelli, R; Turcq, Bruno Jean; Boussafir, Mohammed; Cordeiro, Renato Campello; Disnar, Jean-Robert; Costa, R L; Sifeddine, Abdelfettah; Albuquerque, Ana Luiza Spadano; Bernardes, M C; Jacob, J (2012): Late Holocene paleoenvironmental changes in Northeast Brazil recorded by organic matter in lacustrine sediments of Lake Boqueirão. Palaeogeography, Palaeoclimatology, Palaeoecology, 363-364, 127-134, https://doi.org/10.1016/j.palaeo.2012.08.021
Coverage:
Latitude: -5.246041 * Longitude: -35.545434
Minimum DEPTH, sediment/rock: 0.0000 m * Maximum DEPTH, sediment/rock: 0.0900 m
Event(s):
Boqc0901 * Latitude: -5.246041 * Longitude: -35.545434 * Elevation: -20.0 m * Lake water depth: 8.20 m * Recovery: 0.90 m * Device: Diver-held corer (DHC)
Comment:
Boqc0901, a 90-cm-long core, was collected in a water depth of 8.2 m near the center of lake. This core was sampled in the field by slicing into 0.5-cm sections that were stored in plastic bags. The age-depth model was based on fifteen calibrated 14CAMS dates (https://doi.pangaea.de/10.1594/PANGAEA.897629) on bulk organic matter by Viana et al. (2014).
PIRE NSF-FAPESP: 2017/50085-3
CAPES: 99999.012754/2013-07
NSF Dimensions-Biota FAPESP: 2013/50297
FAPESP: 2016/15807-5
US National Science Foundation NSF: AGS-1303828
US National Science Foundation NSF: OISE-1743738
US National Science Foundation NSF: 1103403
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmUtida, GiselleGeocode
2AGEAgeka BPUtida, GiselleGeocode
3AgeAgea ADUtida, Giselle
4n-Alkanoic acid C28, δ13CC28 Alk. Acid δ13C‰ PDBUtida, GiselleIsotope ratio mass spectrometryper mil VPDB
5n-Alkanoic acid C28, δ13C, standard deviationC28 Alk. Acid δ13C std dev±Utida, Gisellepropagated error of d13C
6C3 plantC3 plant%Utida, Giselleof alkanoic acid with 28 carbons, proportion calculated using -35‰ for C3 plants and -22‰ for C4 plants as end members
7n-Alkanoic acid C28, δDC28 Alk. Acid δD‰ SMOWUtida, GiselleIsotope ratio mass spectrometrydDwax, per mil VSMOW
8n-Alkanoic acid C28, dD, standard deviationC28 Alk. Acid dD std dev±Utida, Gisellepropagated error of dDwax
9δ Deuterium, precipitation wax reconstructionδD precip-wax‰ SMOWUtida, Giselleper mil VSMOW
Size:
623 data points

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