Calibration and application of the branched GDGT temperature proxy on East African lake sediments

Loomis, S. E.; Russell, James M.; Ladd, Bethany; Street-Perrott, F. Alayne; Damsté, Jaap S. Sinninghe

doi:10.1016/j.epsl.2012.09.031

Cited by 189 publications

(228 citation statements)

References 37 publications

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“…It is well known that brGDGT soil calibrations differ from those reported for aquatic environments (Tierney et al, 2010;Zink et al, 2010;Pearson et al, 2011;Sun et al, 2011;Loomis et al, 2012). However, calibrations for river water have not yet been reported.…”

Section: Implications For the Mbt'/cbt Proxymentioning

confidence: 81%

“…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%

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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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Section: Implications For the Mbt'/cbt Proxymentioning

confidence: 81%

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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“…Indeed, several lakespecific calibrations have been developed which incorporated the potential aquatic input of branched GDGTs and thus enable the reconstruction of paleotemperatures based on branched GDGTs in lake sediments (e.g. Tierney et al, 2010b;Pearson et al, 2011;Loomis et al, 2012). This resulted in a better agreement between temperatures calculated for lacustrine branched GDGTs, and measured temperatures.…”

Section: Gdgts Inferred Temperatures In Hmlmentioning

confidence: 96%

“…Despite the fact that in-situ production of branched GDGTs likely occurs in variable proportions in different lakes, several studies suggest that it is still possible to reconstruct MAT using the MBT-CBT proxies (e.g. Zink et al, 2010;Fawcett et al, 2011;Loomis et al, 2012;Naeher et al, 2014). In order to further improve the reliability of GDGT-based proxies in lakes, it is necessary to better understand the sources of the GDGTs in lacustrine systems.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variability in concentrations and fluxes of glycerol dialkyl glycerol tetraethers in Huguangyan Maar Lake, SE China: Implications for the applicability of the MBT–CBT paleotemperature proxy in lacustrine settings

Hong-bin

Peng

et al. 2016

Chemical Geology

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“…Deposition of eroded soil material in lake sediments may render the MBT/CBT proxy a useful tool for studying continental climate change in both high temporal resolution and on a spatially more detailed scale. Consequently, much recent research has explored the MBT/CBT proxy in lake sediments Tierney and Russell, 2009;Bechtel et al, 2010;Blaga et al, 2010;Tierney et al, 2010;Tyler et al, 2010;Zink et al, 2010;Loomis et al, 2011Loomis et al, , 2012Sun et al, 2011;Shanahan et al, 2013). From these studies, it has now become apparent that lakes can contain different brGDGT distributions than those found in the catchment soils that are their presumed source.…”

Section: Introductionmentioning

confidence: 99%

Sources of core and intact branched tetraether membrane lipids in the lacustrine environment: Anatomy of Lake Challa and its catchment, equatorial East Africa

Buckles

Weijers

Verschuren

et al. 2014

Geochimica et Cosmochimica Acta

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110

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The MBT/CBT palaeotemperature proxy uses the distribution of branched glycerol dialkyl glycerol tetraethers (brGDGTs), membrane lipids that are supposed to derive from soil bacteria, to reconstruct mean annual air temperature (MAAT). Applied successfully in coastal marine sediments, its extension to lake-sediment records with potentially high time resolution would greatly expand its utility. Over the last years, however, studies have indicated the presence of additional sources of brGDGTs within lake systems. To constrain the factors influencing the MBT/CBT palaeotemperature proxy in lakes, detailed investigation of brGDGT fluxes in a modern lake system is necessary to identify their potential sources. This study concentrates on Lake Challa, a permanently stratified crater lake in equatorial East Africa with limited catchment area. An almost 3-year time series of approximately monthly samples of settling particles, supplemented with a depth profile of suspended particulate matter (SPM) and sets of profundal surface-sediment and catchment soil samples, were analysed for both the 'living' intact polar lipids (IPLs) and 'fossil' core lipids (CLs) of GDGTs. We found that brGDGTs are produced in oxic, suboxic and anoxic zones of the water column, and in substantial amounts compared to influxes from catchment soils. Additional in-situ production within the lake sediments is most probable, but cannot be definitely confirmed at this time. These lacustrine brGDGTs display a different response to temperature variation than soil-derived brGDGTs, signifying either a different physiological adaptation to changing conditions within the water column and/or a different composition of the respective bacterial communities. Using this specific relationship with temperature, a local calibration based on brGDGT distributions in SPM generates relatively accurate water temperature estimates from settling particles but fails for surface sediments.

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Calibration and application of the branched GDGT temperature proxy on East African lake sediments

Cited by 189 publications

References 37 publications

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

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

Seasonal variability in concentrations and fluxes of glycerol dialkyl glycerol tetraethers in Huguangyan Maar Lake, SE China: Implications for the applicability of the MBT–CBT paleotemperature proxy in lacustrine settings

Sources of core and intact branched tetraether membrane lipids in the lacustrine environment: Anatomy of Lake Challa and its catchment, equatorial East Africa

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