Richey, J E; Hollander, David J; Flower, Benjamin P; Eglinton, Timothy Ian (2011): (Table S1) TEX86 and BIT record from sediment core PBBC-1 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.827381, Supplement to: Richey, JE et al. (2011): Merging late Holocene molecular organic and foraminiferal-based geochemical records of sea surface temperature in the Gulf of Mexico. Paleoceanography, 26(1), PA1209, https://doi.org/10.1029/2010PA002000
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Abstract:
A molecular organic geochemical proxy (TEX86) for sea surface temperature (SST) is compared with a foraminifera-based SST proxy (Mg/Ca) in a decadal-resolution marine sedimentary record spanning the last 1000 years from the Gulf of Mexico. We assess the relative strengths of the organic and inorganic paleoceanographic techniques for reconstructing high-resolution SST variability during recent climate events, including the Little Ice Age (LIA) and the Medieval Warm Period (MWP). SST estimates based on the molecular organic proxy TEX86 show a similar magnitude and pattern of SST variability to foraminiferal Mg/Ca-SST estimates but with some important differences. For instance, both proxies show a cooling (1°C-2°C) of Gulf of Mexico SSTs during the LIA. During the MWP, however, Mg/Ca-SSTs are similar to near-modern SSTs, while TEX86 indicates SSTs that were cooler than modern. Using the respective SST calibrations for each proxy results in TEX86-SST estimates that are 2°C-4°C warmer than Mg/Ca-SST throughout the 1000 year record. We interpret the TEX86-SST as a summer-weighted SST signal from the upper mixed layer, whereas the Mg/Ca-SST better reflects the mean annual SST. Downcore differences in the SST estimates between the two proxies (DeltaT = TEX86 - Mg/Ca) are interpreted in the context of varying seasonality and/or changing water column temperature gradients.
Coverage:
Latitude: 27.193500 * Longitude: -91.409000
Minimum DEPTH, sediment/rock: 0.000 m * Maximum DEPTH, sediment/rock: 1.082 m
Event(s):
PBBC-1 * Latitude: 27.193500 * Longitude: -91.409000 * Elevation: -2259.0 m * Location: Pigmy Basin * Method/Device: Box corer (BC)
Comment:
Each raw TEX86 and BIT index value represents the mean of 3-6 measurements per sample.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Tetraether index of 86 carbon atoms | TEX86 | Richey, J E | |||
| 3 | Branched and isoprenoid tetraether index | BIT | Richey, J E |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
174 data points