Publication Date:
2023-02-07
Description:
The applicability of two organic geochemical proxies (UK'37 based on alkenones and TEXH86 based on glycerol dialkyl glycerol tetraethers) for ocean temperatures was investigated on a regional scale in the SE Brazilian continental margin (Campos Basin) using 53 core-top sediments. In 71% of the samples for UK'37 and 85% for TEXH86, the estimated annual mean sea surface temperature (SST) is comparable to the climatological annual mean data, with deviations within the calibration error. The surface TEXH86 estimates reflects the surface mixed layer, while the depth-integrated (0-200 m) TEXH86 estimates showed better agreement with temperatures at 100-200 mdepth. In addition, the SST-UK'37 results were more consistent (73% of the samples) using a winter calibration rather than an annual mean calibration. This seasonal effect might be ascribed to an increase in the abundance of haptophytes in the region during the winter. Exceptions to these general trends were observed for both proxies as a strong cold bias in reconstructed temperature in a few samples in the southern portion of the studied region, which may be related to (i) a predominant subsurface habitat of Thaumarchaeota combined with enhanced primary production and flux of particles during upwelling and (ii) alkenones being laterally transported from adjacent colder waters. Effects of river input of terrestrially sourced GDGTs on TEXH86 are not evident. Overall, our findings show that UK'37 and TEXH86 are suitable temperature proxies for paleoclimate studies at a regional scale in the SE Brazilian continental margin, but on a local scale the effects of upwelling must be taken in consideration.
Keywords:
A01; A02; A03; A04; A05; A06; A07; A08; A09; A10; A11; A12; Acyclic glycerol dialkyl glycerol tetraether, fractional abundance; Alkenone, per unit mass total organic carbon; Alkenone, unsaturation index UK'37; Alkenone per unit sediment mass; B1; B10; B11; B12; B2; B3; B4; B5; B6; B7; B8; B9; BCM; Box corer, modified; Cabo Frio upwelling system; Campos Basin; Campos Basin Environmental Heterogeneity Project (CENPES/Petrobras); Crenarchaeol, fractional abundance; Crenarchaeol isomer, fractional abundance; Depth, bottom/max; DEPTH, sediment/rock; Depth, top/min; Dicyclic glycerol dialkyl glycerol tetraether, fractional abundance; Event label; extracted from the World Ocean Atlas 2013 (WOA13); G03; G04; G05; G07; G08; G09; G10; G11; G12; Gyre; H1; H10; H11; H12; H2; H3; H4; H5; H6; H7; HAB_A01; HAB_A02; HAB_A03; HAB_A04; HAB_A05; HAB_A06; HAB_A07; HAB_A08; HAB_A09; HAB_A10; HAB_A11; HAB_A12; HAB_B1; HAB_B10; HAB_B11; HAB_B12; HAB_B2; HAB_B3; HAB_B4; HAB_B5; HAB_B6; HAB_B7; HAB_B8; HAB_B9; HAB_G03; HAB_G04; HAB_G05; HAB_G07; HAB_G08; HAB_G09; HAB_G10; HAB_G11; HAB_G12; HAB_H1; HAB_H10; HAB_H11; HAB_H12; HAB_H2; HAB_H3; HAB_H4; HAB_H5; HAB_H6; HAB_H7; HAB_I02; HAB_I04; HAB_I05; HAB_I06; HAB_I07; HAB_I08; HAB_I09; HAB_I10; HAB_I11; HAB_I12; HAB10; HAB11; HAB13; HAB5; HAB8; HAB9; Habitats; High Performance Liquid Chromatography (HPLC-APCI-MS); I02; I04; I05; I06; I07; I08; I09; I10; I11; I12; Isoprenoid glycerol dialkyl glycerol tetraether, per unit mass total organic carbon; Isoprenoid glycerol dialkyl glycerol tetraether, per unit sediment mass; Miss Emma McCall; Monocyclic glycerol dialkyl glycerol tetraether, fractional abundance; Sea surface temperature, annual mean; South Atlantic Ocean; surface sediments; Tetraether index of 86 carbon atoms; TEXH86; Tricyclic glycerol dialkyl glycerol tetraether, fractional abundance; UK'37; van Veen Grab, modified; VGRABM
Type:
Dataset
Format:
text/tab-separated-values, 745 data points
Permalink
