A refined paleotemperature calibration for New Zealand limnic environments using differentiation of branched glycerol dialkyl glycerol tetraether (brGDGT) sources

Zink, Klaus-Gerhard; Vandergoes, Marcus J.; Bauersachs, Thorsten; Newnham, Rewi M.; Rees, Andrew; Schwark, Lorenz

doi:10.1002/jqs.2908

Cited by 23 publications

(17 citation statements)

References 62 publications

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“…To analyse the GDGT content, aliquots of the polar fractions were dissolved in n-hexane:2-propanol (99 : 1; v/v) and passed through a 0.4 µm polytetrafluoroethylene filter. Analysis of GDGTs was performed using an Alliance 2695 (Waters, UK) high-performance liquid chromatograph coupled to a ZQ (Micromass, UK) single quadrupole mass spectrometer (MS) as detailed in Zink et al (2016) following the analytical protocols of Hopmans et al (2000) and Liu et al (2012). Isoprenoid and branched GDGTs were detected using single ion recording of their protonated molecules [M+H] + as outlined in Schouten et al (2013a).…”

Section: Biomarkersmentioning

confidence: 99%

Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)

et al. 2017

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Abstract. Sediment records recovered from the Baltic Sea during Integrated Ocean Drilling Program Expedition 347 provide a unique opportunity to study paleoenvironmental and climate change in central and northern Europe. Such studies contribute to a better understanding of how environmental parameters change in continental shelf seas and enclosed basins. Here we present a multi-proxy-based reconstruction of paleotemperature (both marine and terrestrial), paleosalinity, and paleoecosystem changes from the Little Belt (Site M0059) over the past ∼ 8000 years and evaluate the applicability of inorganic-and organic-based proxies in this particular setting.All salinity proxies (diatoms, aquatic palynomorphs, ostracods, diol index) show that lacustrine conditions occurred in the Little Belt until ∼ 7400 cal yr BP. A connection to the Kattegat at this time can thus be excluded, but a direct connection to the Baltic Proper may have existed. The transition to the brackish-marine conditions of the Littorina Sea stage (more saline and warmer) occurred within ∼ 200 years when the connection to the Kattegat became established after ∼ 7400 cal yr BP. The different salinity proxies used here generally show similar trends in relative changes in salinity, but often do not allow quantitative estimates of salinity.Published by Copernicus Publications on behalf of the European Geosciences Union. U. Kotthoff et al.: Little Belt multi-proxy comparisonThe reconstruction of water temperatures is associated with particularly large uncertainties and variations in absolute values by up to 8 • C for bottom waters and up to 16 • C for surface waters. Concerning the reconstruction of temperature using foraminiferal Mg / Ca ratios, contamination by authigenic coatings in the deeper intervals may have led to an overestimation of temperatures. Differences in results based on the lipid paleothermometers (long chain diol index and TEX L 86 ) can partly be explained by the application of modern-day proxy calibrations to intervals that experienced significant changes in depositional settings: in the case of our study, the change from freshwater to marine conditions. Our study shows that particular caution has to be taken when applying and interpreting proxies in coastal environments and marginal seas, where water mass conditions can experience more rapid and larger changes than in open ocean settings. Approaches using a multitude of independent proxies may thus allow a more robust paleoenvironmental assessment.

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Section: Biomarkersmentioning

confidence: 99%

Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)

et al. 2017

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“…They defined new indices and established new calibrations. Lake sediment studies have involved the development of specific calibrations (Bendle et al, 2010;Blaga et al, 2010;Tierney et al, 2010;Sun et al, 2011;Zink et al, 2016;Russell et al, 2018). Most of these studies demonstrated that in situ production in the water column or in the sediment could occur, potentially biasing the results obtained (Tierney and Russell, 2009;Loomis et al, 2011;Tierney et al, 2012;Wang et al, 2012a;Buckles et al, 2014aBuckles et al, , 2014b.…”

Section: Introductionmentioning

confidence: 99%

Early Holocene Thermal Maximum recorded by branched tetraethers and pollen in Western Europe (Massif Central, France)

Martin

Ménot

Thouveny

et al. 2020

Quaternary Science Reviews

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The evolution of temperatures during the Holocene is controversial, especially for the early Holocene. The occurrence of the Holocene Thermal Maximum (HTM) during the early Holocene has recently been reconsidered and seasonal biases have been suggested in the paleoclimatic proxies. High regional variability and a low number of reliable and continuous quantitative reconstructions compared with the oceanic realm further complicate study of the Holocene climate in the continental realm. We analyzed branched glycerol dialkyl glycerol tetraethers (brGDGTs), an organic paleothermometer, and palynological signals as part of a multiproxy analysis of the sedimentary record from Lake St Front, in the Massif Central (France). Identification of a shift in brGDGT sources through the Holocene required removing terrigenous influences from the temperature signal. BrGDGT-and pollen-inferred paleotemperature reconstructions (based on the Modern Analog Technique and the Weighted Averaging Partial Least Squares method) were compared. Both showed a thermal maximum during the early Holocene followed by a decrease of temperatures. We evaluated biases which could potentially influence the reconstructed signal. There was no evidence for a summer temperature bias either for brGDGT-derived temperatures or for pollen-derived temperatures. The Lake St Front data, in agreement with other regional records, confirm the occurrence of the HTM as a general warm period during the early Holocene followed by mid-Holocene cooling in Western Europe and suggest that seasonal biases are not the main explanation of the Holocene conundrum d the disagreement between model simulations and proxy-based temperature reconstructions for the northern hemisphere.

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Section: Biomarkersmentioning

confidence: 99%

Final author comments

Kotthoff¹

2017

Preprint

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Dear Professor Kienast, dear referees, Thank you very much for the helpful comments and suggestion for our manuscript. We can follow most of the arguments of all referees and will thus incorporate almost all suggestions made. In the attached PDF file, we have listed responses to the different points made. There are only a few cases in which we would prefer not to follow the suggestions made, but we offer compromise solutions in most of these cases. C1

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A refined paleotemperature calibration for New Zealand limnic environments using differentiation of branched glycerol dialkyl glycerol tetraether (brGDGT) sources

Cited by 23 publications

References 62 publications

Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)

Reconstructing Holocene temperature and salinity variations in the western Baltic Sea region: a multi-proxy comparison from the Little Belt (IODP Expedition 347, Site M0059)

Early Holocene Thermal Maximum recorded by branched tetraethers and pollen in Western Europe (Massif Central, France)

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