Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia)

Damsté, J.S. Sinninghe

doi:10.1016/j.gca.2016.04.033

Cited by 176 publications

(127 citation statements)

References 67 publications

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“…However, a high BIT value could also result from production of brGDGTs in marine sediments and the water column (Peterse et al, 2009;Sinninghe Damsté, 2016). Still the composition of the 200 brGDGTs can be used to distinguish between marine and soil-derived GDGT input, in particular by using the #ring tetra index (Sinninghe Damsté, 2016). We have applied this index on samples analyzed by UHPLC/MS to see if TEX 86 values are reliable despite high BIT index values.…”

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confidence: 99%

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Oligocene TEX86-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Hartman

Sangiorgi

Salabarnada

et al. 2017

Preprint

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Abstract. Today, the temperature of the surface waters near the Antarctic coast is a determining factor in the formation of Antarctic Bottom Water (AABW) through sea-ice production, sea-ice extent, and the extent of the ice shelf. O variability is due to large glacial-interglacial bottom-water temperature shifts, the Oligocene Antarctic ice volume was less sensitive to climate change than previously assumed. 45Clim. Past Discuss., https://doi

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confidence: 99%

“…values are the result of high marine brGDGT input, but none of these samples had #rings tetra above 0.7 (Sinninghe Damsté, 2016) meaning that a significant portion of the brGDGTs was likely soil-derived. All of these samples are therefore discarded.…”

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confidence: 99%

Oligocene TEX86-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Hartman

Sangiorgi

Salabarnada

et al. 2017

Preprint

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“…Additionally, the IR penta , which indicates the relative contribution of 6‐methyl brGDGTs, is low throughout the record (0.10–0.26; Fig. A), whereas high IR values have been reported for aquatic environments so far (>0.5; De Jonge et al ., ; Sinninghe Damsté, ). The IR shows a positive relationship to pH in soils (De Jonge et al ., ), and the relatively high IR values found in the aquatic environment have subsequently been attributed to the generally higher pH of an aquatic system (e.g.…”

Section: Discussionmentioning

confidence: 97%

Late Holocene changes in vegetation and atmospheric circulation at Lake Uddelermeer (The Netherlands) reconstructed using lipid biomarkers and compound‐specific δD analysis

Bos

Engels

Bohncke³

et al. 2018

J Quaternary Science

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We reconstructed middle to late Holocene changes in atmospheric circulation patterns and vegetation in north-west Europe by applying novel geochemical techniques to the sediment record of Lake Uddelermeer (The Netherlands). A comparison of higher plant-derived leaf wax n-alkane distributions archived in the lake sediments with those in living plant material, combined with palynological analysis, indicates that the vegetation immediately surrounding the lake became more open at 3150 cal a BP, while the regional vegetation responded more gradually and $650 years later. Our record of the hydrogen isotopic composition of plant leaf waxes (dD wax ) shows a deuterium enrichment starting from 3500 cal a BP, which we interpret as a change in atmospheric circulation. A similar dD wax record from nearby Meerfelder Maar (Germany) shows an opposite trend around this time, which could be explained by a change in sea-level pressure resembling a negative North Atlantic Oscillation phase. This could account for depleted dD values of precipitation at Meerfelder Maar, while confounding factors related to the more maritime position of Uddelermeer cause the opposite shift there.

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“…S1 for structures; Table S1). A previous study established that when plotted in a ternary diagram the fractional abundances of the tetra-, penta-and hexamethylated brGDGTs, soils lie within a distinct area (Sinninghe Damsté, 2016). To assess whether the brGDGTs in the BP deposit were predominantly derived from soils, we compared the fractional abundances of the tetra-, penta-and hexamethylated brGDGTs in the BP sediments to those from modern datasets in a ternary diagram (Fig.…”

Section: Provenance Of Branched Gdgtsmentioning

confidence: 99%

The role of elevated atmospheric CO2 and increased fire in Arctic amplification of temperature during the Early to mid-Pliocene

Fletcher¹,

Warden²,

Damsté³

et al. 2018

Preprint

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Abstract. The mid-Pliocene is a valuable time interval for understanding the mechanisms that determine equilibrium climate at current CO2 concentrations. One intriguing, but not fully understood, feature of the early to mid-Pliocene climate is the amplified arctic temperature response. Current models underestimate the degree of warming in the Pliocene Arctic and validation of proposed feedbacks is limited by scarce terrestrial records of climate and environment, as well as discrepancies 20 in current CO2 proxy reconstructions. Here we reconstruct the CO2 and summer temperature from a re-dated 3.9 +1.5/-0.5 Ma sub-fossil fen-peat deposit on west-central Ellesmere Island, Canada, and investigate fire as a potential feedback to Arctic amplification of warming during the mid-Pliocene.Average CO2 was determined using isotope ratios of mosses to be 440 ± 50 ppm. The estimate for average mean summer temperature is 15.4±0.8°C using specific bacterial membrane lipids, i.e. branched glycerol dialkyl glycerol tetraethers. Macro-25 charcoal was present in all samples from this Pliocene section with notably higher charcoal concentration in the upper part of the sequence. This change in charcoal was synchronous with a change in vegetation that saw fire promoting taxa increase in abundance. Paleovegetation reconstructions are consistent with warm summer temperatures, relatively low summer precipitation and an incidence of fire comparable to fire adapted boreal forests of North America, or potentially central Siberia.To our knowledge, this study represents the furthest northern evidence of fire during the Pliocene and highlights the important 30 role of forest fire in the ecology and climatic processes of the Pliocene High Arctic. The results provide evidence that terrestrial fossil localities in the Pliocene High Arctic were probably formed during warm intervals that coincided with relatively high CO2 concentrations that supported productive biotic communities. This study indicates that interactions between concentrations were only ~30 ppm higher than modern.

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Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia)

Cited by 176 publications

References 67 publications

Oligocene TEX<sub>86</sub>-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Oligocene TEX<sub>86</sub>-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Late Holocene changes in vegetation and atmospheric circulation at Lake Uddelermeer (The Netherlands) reconstructed using lipid biomarkers and compound‐specific δD analysis

The role of elevated atmospheric CO<sub>2</sub> and increased fire in Arctic amplification of temperature during the Early to mid-Pliocene

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Spatial heterogeneity of sources of branched tetraethers in shelf systems: The geochemistry of tetraethers in the Berau River delta (Kalimantan, Indonesia)

Cited by 176 publications

References 67 publications

Oligocene TEX&lt;sub&gt;86&lt;/sub&gt;-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Oligocene TEX&lt;sub&gt;86&lt;/sub&gt;-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Late Holocene changes in vegetation and atmospheric circulation at Lake Uddelermeer (The Netherlands) reconstructed using lipid biomarkers and compound‐specific δD analysis

The role of elevated atmospheric CO&lt;sub&gt;2&lt;/sub&gt; and increased fire in Arctic amplification of temperature during the Early to mid-Pliocene

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Product

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Oligocene TEX<sub>86</sub>-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

Oligocene TEX<sub>86</sub>-derived seawater temperatures from offshore Wilkes Land (East Antarctica)

The role of elevated atmospheric CO<sub>2</sub> and increased fire in Arctic amplification of temperature during the Early to mid-Pliocene