Climatic and environmental controls on the occurrence and distributions of long chain alkenones in lakes of the interior United States

Toney, Jaime L.; Huang, Yongsong; Fritz, Sherilyn C.; Baker, Paul A.; Grimm, Eric C.; Nyrén, Pål

doi:10.1016/j.gca.2009.11.021

Cited by 96 publications

(102 citation statements)

References 60 publications

(92 reference statements)

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“…Over the past two decades, the U 3 k′ 7 proxy has been widely used to quantitatively reconstruct sea surface temperature changes on various timescales, and proved to be one of the best temperature proxies to date. Although largely applied in marine settings previously, its capability for temperature reconstructions from lake sediments has been indicated by recent studies [30,32,34,[37][38][39][40][41][42][43][44][45]. Chu et al [37] In this study, we interpret U 3 k′ 7 reflecting summer lake surface temperature, using the culture calibration from Sun et al [32].…”

Section: Discussionmentioning

confidence: 96%

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Liu

Zhao

et al. 2013

Chin. Sci. Bull.

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Considerable efforts have been made to extend temperature records beyond the instrumental period through proxy reconstructions, in order to further understand the mechanisms of past climate variability. Yet, the global coverage of existing temperature records is still limited, especially for some key regions like the Tibetan Plateau and for earlier times including the Medieval Warm Period (MWP). Here we present decadally-resolved, alkenone-based, temperature records from two lakes on the northern Tibetan Plateau. Characterized by marked temperature variability, our records provide evidence that temperatures during the MWP were slightly higher than the modern period in this region. Further, our temperature reconstructions, within age uncertainty, can be well correlated with solar irradiance changes, suggesting a possible link between solar forcing and natural climate variability, at least on the northern Tibetan Plateau.

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Section: Discussionmentioning

confidence: 96%

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Liu

Zhao

et al. 2013

Chin. Sci. Bull.

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“…There are a number of studies that have used microfossil assemblages based on pollen, diatoms or chironomids preserved in lake sediments to estimate past air or lake water temperatures (e.g., Colinvaux et al, 1996;Lotter et al, 1997;Kurek et al, 2009). A molecular proxy initially developed to estimate past sea surface temperatures has also been shown to be applicable in lake settings, i.e., the long-chain alkenone unsaturation index (e.g., Marlowe et al, 1984;Zink et al, 2001;Toney et al, 2010). In addition, the glycerol dialkyl glycerol tetraethers (GDGTs) have also been applied in marine as well as continental records for the same purpose (e.g., Powers et al, 2004Powers et al, , 2010Blaga et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Influence of water availability in the distributions of branched glycerol dialkyl glycerol tetraether in soils of the Iberian Peninsula

Menges

Huguet²,

Alcañiz

et al. 2014

Biogeosciences

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Abstract. The combined application of the MBT (degree of methylation) and CBT (degree of cyclization) indices, based on the distribution of branched glycerol dialkyl glycerol tetraethers (brGDGTs) in soils, has been proposed as a paleoproxy to estimate mean annual temperature (MAT). CBT quantifies the degree of cyclization of brGDGTs and relates to soil pH. MBT and the simplified version MBT' quantify the degree of methylation of brGDGTs and relate to MAT and soil pH. However, other factors such as soil water availability have also been suggested to influence MBT' and possibly restrict the combined application of the MBT' and CBT indices as a paleotemperature proxy. To assess the effect of hydrological conditions on MBT' and CBT, a set of 23 Iberian Peninsula soil samples, covering a MAT range from 10 to 18 • C and a mean annual precipitation (MAP) range of 405 mm to 1455 mm, was analyzed. We found that the CBT was indeed significantly correlated with soil pH in our sample set. In contrast, MBT' was not correlated with MAT but had a significant correlation with the aridity index (AI), a parameter related to water availability in soils. The AI can explain 50 % of the variation of the MBT', and 70 % of the residuals of MAT estimated with the MBT/CBT proxy as compared to instrumentally measured MAT. We propose that, in arid settings, where water may be an ecologically limiting factor, MBT' is influenced by hydrological conditions rather than temperature. Thus, our results suggest that the combination of MBT' and CBT indices should be applied with caution in paleotemperature reconstructions in soils from dry subhumid to hyperarid environments.

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“…Well-established, lipid-based proxy indicators for sea surface temperature reconstructions, for instance, are the so-called TEX 86 (Schouten et al, 2002) and U k 37 -indices (Brassell et al, 1986), but their application in lacustrine environments can be challenging. The relevant thaumarchaeotal glycerol dialkyl glycerol tetraethers (GDGTs) used for the TEX 86 -index as well as specific algal alkenones that are applied in the U k 37 -index are not ubiquitous in lakes (Zink et al, 2001;Blaga et al, 2009;Toney et al, 2010;Powers et al, 2010). Also, the admixture of GDGTs from soil and sedimentary archaea can compromise the use of the TEX 86 -paleothermometer in lacustrine systems (Weijers et al, 2006b;Sinninghe Damsté et al, 2009;Tierney and Russell, 2009).…”

Section: Introductionmentioning

confidence: 99%

Bacterial GDGTs in Holocene sediments and catchment soils of a high Alpine lake: application of the MBT/CBT-paleothermometer

et al. 2012

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Climatic and environmental controls on the occurrence and distributions of long chain alkenones in lakes of the interior United States

Cited by 96 publications

References 60 publications

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Solar influenced late Holocene temperature changes on the northern Tibetan Plateau

Influence of water availability in the distributions of branched glycerol dialkyl glycerol tetraether in soils of the Iberian Peninsula

Bacterial GDGTs in Holocene sediments and catchment soils of a high Alpine lake: application of the MBT/CBT-paleothermometer

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