Branched glycerol dialkyl glycerol tetraethers in Arctic lake sediments : sources and implications for paleothermometry at high latitudes
Vonk, Jorien E.
Holmes, Robert M.
Eglinton, Timothy I.
MetadataShow full item record
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are analyzed in different lakes of the Mackenzie (Canadian Arctic) and Kolyma (Siberian Arctic) River basins to evaluate their sources and the implications for brGDGT-based paleothermometry in high-latitude lakes. The comparison of brGDGT distributions and concentrations in the lakes with those in river suspended particulate matter, riverbank sediments, and permafrost material indicates that brGDGTs in Arctic lake sediments have mixed sources. In contrast to global observations, distributional offsets between brGDGTs in Arctic lakes and elsewhere in the catchment are minor, likely due to the extreme seasonality and short window of biological production at high latitudes. Consequently, both soil- and lake-calibrated brGDGT-based temperature proxies return sensible temperature estimates, even though the mean air temperature (MAT) in the Arctic is below the calibration range. The original soil-calibrated MBT-CBT (methylation of branched tetraethers–cyclisation of branched tetraethers) proxy generates MATs similar to those in the studied river basins, whereas using the recently revised MBT′-CBT calibration overestimates MAT. The application of the two global lake calibrations, generating summer air temperatures (SAT) and MAT, respectively, illustrates the influence of seasonality on the production of brGDGTs in lakes, as the latter overestimates actual MAT, whereas the SAT-based lake calibration accounts for this influence and consequently returns more accurate temperatures. Our results in principle support the application of brGDGT-based temperature proxies in high-latitude lakes in order to obtain long-term paleotemperature records for the Arctic, although the calibration and associated transfer function have to be selected with care.
Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Biogeosciences 119 (2014): 1738–1754, doi:10.1002/2014JG002639.
Suggested CitationArticle: Peterse, Francien, Vonk, Jorien E., Holmes, Robert M., Giosan, Liviu, Zimov, Nikita, Eglinton, Timothy I., "Branched glycerol dialkyl glycerol tetraethers in Arctic lake sediments : sources and implications for paleothermometry at high latitudes", Journal of Geophysical Research: Biogeosciences 119 (2014): 1738–1754, DOI:10.1002/2014JG002639, https://hdl.handle.net/1912/6954
Showing items related by title, author, creator and subject.
Effects of branching spatial structure and life history on the asymptotic growth rate of a population Goldberg, Emma E.; Lynch, Heather J.; Neubert, Michael G.; Fagan, William F. (2010-09-08)The dendritic structure of a river network creates directional dispersal and a hierarchical arrangement of habitats. These two features have important consequences for the ecological dynamics of species living within the ...
Insight into the evolution of microbial metabolism from the deep-branching bacterium, Thermovibrio ammonificans Giovannelli, Donato; Sievert, Stefan M.; Hugler, Michael; Markert, Stephanie; Becher, Dorte; Schweder, Thomas; Vetriani, Costantino (eLife, 2017-04-24)Anaerobic thermophiles inhabit relic environments that resemble the early Earth. However, the lineage of these modern organisms co-evolved with our planet. Hence, these organisms carry both ancestral and acquired genes ...
Rapid sulfurisation of highly branched isoprenoid (HBI) alkenes in sulfidic Holocene sediments from Ellis Fjord, Antarctica Sinninghe Damste, Jaap S.; Rijpstra, W. Irene C.; Coolen, Marco J. L.; Schouten, Stefan; Volkman, John K. (2006-04-03)Samples of particulate organic matter from the water column and anoxic Holocene sediment layers from the Small Meromictic Basin (SMB) in Ellis Fjord (eastern Antarctica) were analyzed to study the early incorporation of ...