Comparison of instrumental and GDGT-based estimates of sea surface and air temperatures from the Skagerrak

Rueda, Gemma; Rosell-Melé, Antoni; Escala, Marina; Gyllencreutz, Richard; Backman, Jan

doi:10.1016/j.orggeochem.2008.10.012

Cited by 74 publications

(67 citation statements)

References 20 publications

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“…For example, Rueda et al (2009) compared instrumental temperature data with branched GDGT-derived MAAT estimates for a sediment core from the Skagerrak, off Norway, and found that MAAT values derived from the MBT and CBT were in closer agreement with summer than with annual air temperatures. It should nevertheless be noted that these data might be influenced by in situ production of branched GDGTs in the water column and/or marine sediments.…”

Section: Air Temperaturementioning

confidence: 99%

“…The MBT and CBT indices are increasingly used as palaeoenvironmental proxies and have been successfully applied to the reconstruction of past air temperatures in deltaic and coastal regions (e.g. the Congo fan, Weijers et al, 2007b; the North Sea, Donders et al, 2009;Rueda et al, 2009) and very recently in Chinese loess ) based on comparison with instrumental records and/or data obtained from other proxies.…”

Section: Introductionmentioning

confidence: 99%

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Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Huguet¹,

Fosse

Laggoun‐Défarge

et al. 2013

Geochimica et Cosmochimica Acta

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To cite this version:Arnaud Huguet, Céline Fosse, Fatima Laggoun-Défarge, Frédéric Delarue, Sylvie Derenne. Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland. Geochimica et Cosmochimica Acta, Elsevier, 2013Elsevier, , 105, pp.294-315. 10.1016Elsevier, /j.gca.2012 Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland AbstractBranched glycerol dialkyl glycerol tetraethers (GDGTs) are complex lipids of high molecular weight, recently discovered in soils and increasingly used as palaeoclimate proxies. Their degree of methylation, expressed in the MBT, was shown to depend on mean annual air temperature (MAAT) and to a lesser extent on soil pH, whereas the relative abundance of cyclopentyl rings of branched GDGTs, expressed in the CBT, was related to soil pH. To date, only a few studies were interested in the application of the MBT and CBT proxies in peatlands. In order to validate the applicability of branched GDGTs as temperature proxies in these environments, it is essential to investigate the effect of temperature on branched GDGT-producing bacteria and especially on the speed of adaptation of these microorganisms to temperature changes. The aim of this work was to study the effects of in situ experimental climate warming on the abundance and distribution of branched GDGTs in a Sphagnum-dominated peatland (Jura Mountains, France). Branched GDGTs either present as core lipids (CLs; presumed of fossil origin) or derived from intact polar lipids (IPLs, markers for living cells) were analysed. Air temperature was experimentally increased using a passive warming system consisting of open mini-greenhouses (open-top chamber -OTC). The effect of the OTCs was especially apparent in spring and summer, with (i) an increase in maximal air temperature of ca. 3°C during these two seasons and (ii) an increase in average air temperature of ca. 1°C in summer. Despite the short duration of the climate experiment (26 months), branched GDGT distribution was significantly affected by this temperature rise, with higher MBT values in the OTCs than in the control plots, supporting the empirical relationship between MBT and MAAT established from a large range of soils. The difference in branched GDGT-derived temperatures between control and OTC plots (2-3°C) was in the same range as the increase in maximal (daytime) temperature induced by the OTCs in spring and summer, suggesting that branched GDGT-producing bacteria might be more active during the warmest months of the year. The OTC treatment had no significant effect on the abundance of branched GDGTs, which were mainly present as "fossil" CLs (70-85% of the total branched GDGT pool). Furthermore, no significant differences in branched GDGT distribution were observed between the CLs and IPLs, which both provided higher MBT and MAAT values for the OTCs. This suggests that the fossil pool of branched GDGTs has a very fast turnove...

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Section: Air Temperaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Huguet¹,

Fosse

Laggoun‐Défarge

et al. 2013

Geochimica et Cosmochimica Acta

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“…Samples collected from deep peat horizons gave GDGT-derived MAAT values lower than those collected from surficial horizons ( Table 2), implying that MAAT estimates derived from bacterial GDGTs could be in closer agreement with spring and summer soil temperature rather than with annual soil or air temperature. Similarly, Rueda et al (2009) one possible explanation could be that branched GDGT-synthesising bacteria are more active during summer than the rest of the year, since Scandinavian soils are snow-covered for several months. Such an explanation might also hold for the peat bog investigated in the present study, where soil temperature was observed to vary over a large range, whatever the depth (Table 3).…”

Section: Reconstruction Of Air Temperature and Peat Phmentioning

confidence: 99%

“…The MBT and CBT indices have recently been shown to be useful tools for the reconstruction of continental temperatures (e.g. Weijers et al, 2007b;Schouten et al, 2008;Rueda et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Occurrence and distribution of glycerol dialkyl glycerol tetraethers in a French peat bog

Huguet

Fosse

Laggoun‐Défarge

et al. 2010

Organic Geochemistry

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To cite this version:Arnaud Huguet, Céline Fosse, Fatima Laggoun-Défarge, Marie-Laure Toussaint, Sylvie Derenne. Occurrence and distribution of glycerol dialkyl glycerol tetraethers in a French peat bog. Organic Geochemistry, Elsevier, 2010, 41 (6) ABSTRACTThe present study was aimed at examining the distribution and abundance of glycerol dialkyl glycerol tetraethers (GDGTs) of archaeal and bacterial origin in peat samples from surface and deep (ca. 50 cm) horizons of a peat bog in the Jura Mountains (northeastern France). Two principal types of GDGTs are present: extractable GDGTs, recoverable by solvent extraction, and non-extractable GDGTs, linked to the soil matrix. Within the extractable pool, "free" (i.e. core lipids) and "bound" (i.e. intact polar and/or ester-bound lipids) GDGTs can be distinguished. Extractable "free" and "bound" GDGTs were extracted using both accelerated solvent extraction (ASE) and a modified Bligh and Dyer technique.Both methods were shown to allow adequate extraction of "free" archaeal and bacterialGDGTs from soil samples. Both extraction protocols afforded similar relative distributions of archaeal and bacterial GDGTs, although poorer extraction of "bound" GDGTs was observed for ASE relative to Bligh and Dyer. Even though only low amounts of bacterial GDGTs were released after acid hydrolysis of solvent-extracted samples, non-extractable and total

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“…The MBT/CBT proxy is one of the few quantitative temperature proxies that have been introduced for terrestrial environments. The MBT/CBT proxy has been used to reconstruct past MAAT changes in diverse settings: marine (e.g., Weijers et al, 2007b;Donders et al, 2009;Rueda et al, 2009;Bendle et al, 2010) and lacustrine (Tyler et al, 2010;Zink et al, 2010;Fawcett et al, 2011;Loomis et al, 2012;Niemann et al, 2012;D'Anjou et al, 2013) sediments, peat (Ballantyne et al, 2010), and loess deposits (Peterse et al, 2011a;Zech et al, 2012;Jia et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Transport of branched tetraether lipids from the Tagus River basin to the coastal ocean of the Portuguese margin: consequences for the interpretation of the MBT'/CBT paleothermometer

Zell

Kim

Balsinha³

et al. 2014

Biogeosciences

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Abstract. Branched glycerol dialkyl glycerol tetraethers (brGDGTs), which are thought to be transported from soil to marine sediment by rivers, have been used to reconstruct the mean annual air temperature (MAAT) and soil pH of the drainage basin using the methylation index of branched tetraethers (MBT, recently refined as MBT') and cyclization index of branched tetraethers (CBT) from coastal marine sediment records. In this study, we trace the brGDGTs from source to sink in the Tagus River basin, the longest river system on the Iberian Peninsula, by determining their concentration and distribution in soils, river suspended particulate matter (SPM), riverbank sediments, marine SPM, and marine surface sediments. The concentrations of brGDGTs in river SPM were substantially higher and their distributions were different compared to those of the drainage basin soils. This indicates that brGDGTs are mainly produced in the river itself. In the marine environment, the brGDGT concentrations rapidly decreased with increasing distance from the Tagus estuary. At the same time, the brGDGT distributions in marine sediments also changed, indicating that marine in situ production also takes place. These results show that there are various problems that complicate the use of the MBT'/CBT for paleoreconstructions using coastal marine sediments in the vicinity of a river. However, if the majority of brGDGTs are produced in the river, it might be possible to reconstruct the environmental (temperature and pH) conditions of the river water using appropriate aquatic calibrations, provided that marine core locations are chosen in such a way that the brGDGTs in their sediments are predominantly derived from riverine in situ production.

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Comparison of instrumental and GDGT-based estimates of sea surface and air temperatures from the Skagerrak

Cited by 74 publications

References 20 publications

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Occurrence and distribution of glycerol dialkyl glycerol tetraethers in a French peat bog

Transport of branched tetraether lipids from the Tagus River basin to the coastal ocean of the Portuguese margin: consequences for the interpretation of the MBT'/CBT paleothermometer

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