Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Dauner, Ana Lúcia Lindroth; Mollenhauer, Gesine; Bícego, Márcia Caruso; de Souza, Mihael Machado; Nagai, Renata Hanae; Figueira, Rubens César Lopes; Mahiques, Michel Michaelovitch; de Mello e Sousa, Silvia Helena; Martins, César Castro (2019): UK'37, TEX86 and LDI indices, and temperature estimates for sediment core NAP 63-1 (South Brazil Bight). PANGAEA, https://doi.org/10.1594/PANGAEA.901238, Supplement to: Dauner, Ana Lúcia Lindroth; Mollenhauer, Gesine; Bícego, Márcia Caruso; de Souza, Mihael Machado; Nagai, Renata Hanae; Figueira, Rubens César Lopes; de Mahiques, Michel Michaelovitch; de Mello e Sousa, Silvia Helena; Martins, César Castro (2019): Multi-proxy reconstruction of sea surface and subsurface temperatures in the western South Atlantic over the last ∼75 kyr. Quaternary Science Reviews, 215, 22-34, https://doi.org/10.1016/j.quascirev.2019.04.020

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

Abstract:
Millennial-scale oscillations are known to be important in the climatic evolution of the Atlantic basin, but which internal processes originates these oscillations are still uncertain. In this study, we investigated how the Greenland and Antarctic climates affect the SW Atlantic through basin-wide oceanographic features (such as the NADW formation and the Agulhas leakage). We reconstructed sea surface and subsurface temperatures (SST and subT) using three lipid-based biomarker proxies (UK'37, TEX86 and LDI indexes) from a sediment core (NAP 63-1) retrieved from the SW Atlantic slope (24.8°S, 44.3°W). This location permitted to evaluate the temperature oscillations of the Brazil Current without any terrigenous or upwelling-derived biases. Both TEX86-based and LDI-based estimates represent the mean annual SST, while the UK'37-based estimates represent the subT (around 30 m water depth). The periods with the most well-mixed water column were observed during intervals of cooling orbital trends due to the time required to transfer the surface cooling to the subsurface. The temperature reconstructions showed a general colder MIS 3 when compared to the MIS 4. They also showed evidence of a late response to the deglaciation, with its onset in the SW Atlantic occurring in the middle of the Last Glacial Maximum. Based on these reconstructions, the NAP 63-1 SST orbital-scale trend seems to be linked to the Antarctic climate, influenced by local insolation changes. These temperature records also presented a clear millennial periodicity around 8 kyr. On this timescale, the millennial oscillations in the SW Atlantic's SST are likely linked to the NADW formation.
Keyword(s):
Holocene; LDI; Organic geochemistry.; paleoceanography; Pleistocene; South Atlantic; TEX86; UK'37
Coverage:
Latitude: -24.838400 * Longitude: -44.318733
Date/Time Start: 2013-02-26T00:00:00 * Date/Time End: 2013-02-26T00:00:00
Minimum DEPTH, sediment/rock: 0.01 m * Maximum DEPTH, sediment/rock: 2.23 m
Event(s):
NAP_63-1 * Latitude: -24.838400 * Longitude: -44.318733 * Date/Time: 2013-02-26T00:00:00 * Elevation: -842.0 m * Location: South Brazil Bight, Santos Basin * Campaign: AC07/02 * Basis: Alpha-Crucis * Method/Device: Piston corer (PC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepthmDauner, Ana Lúcia LindrothGeocode
2Depth, top/minDepth topmDauner, Ana Lúcia Lindroth
3Depth, bottom/maxDepth botmDauner, Ana Lúcia Lindroth
4AGEAgeka BPDauner, Ana Lúcia LindrothGeocode
5Alkenone, unsaturation index UK'37UK'37Dauner, Ana Lúcia LindrothGas chromatography - Flame Ionization Detection (GC-FID)
6Sea surface temperature, annual meanSST (1-12)°CDauner, Ana Lúcia LindrothCalculated from UK'37 (Müller et al, 1998)calibration for 30 m water depth
7Tetraether index of 86 carbon atomsTEX86Dauner, Ana Lúcia LindrothHigh Performance Liquid Chromatography (HPLC-APCI-MS)
8Tetraether index of 86 carbon atoms, high-temperature regionTEX86HDauner, Ana Lúcia LindrothHigh Performance Liquid Chromatography (HPLC-APCI-MS)
9Sea surface temperature, annual meanSST (1-12)°CDauner, Ana Lúcia LindrothCalculated from TEX86H (Kim et al., 2012)
10Long chain diol indexLDIDauner, Ana Lúcia LindrothGas chromatography - Mass spectrometry (GC-MS)
11Sea surface temperature, annual meanSST (1-12)°CDauner, Ana Lúcia LindrothCalculated after Rampen et al. (2012)
Size:
974 data points

Download Data

Download dataset as tab-delimited text (use the following character encoding: )

View dataset as HTML