Introducing global peat-specific temperature and pH calibrations based on brGDGT bacterial lipids

Show simple item record Naafs, B. D. A. Inglis, G. N. Zheng, Y. Amesbury, M. J. Biester, H. Bindler, R. Blewett, J. Burrows, M. A. del Castillo Torres, D. Chambers, F. M. Cohen, A. D. Evershed, R. P. Feakins, S. J. Galka, M. Gallego-Sala, A. Gandois, L. Gray, D. M. Hatcher, P. G. Honorio Coronado, E. N. Hughes, P. D. M. Huguet, A. Kononen, M. Laggoun-Defarge, F. Lahteenoja, O. Lamentowicz, M. Marchant, R. McClymont, E. Pontevedra-Pombal, X. Ponton, C. Pourmand, A. Rizzuti, A. M. Rochefort, L. Schellekens, J. De Vleeschouwer, F. Pancost, R. D. 2017-06-27T10:47:01Z 2017-06-27T10:47:01Z 2017-07-01
dc.identifier.citation Naafs , B D A , Inglis , G N , Zheng , Y , Amesbury , M J , Biester , H , Bindler , R , Blewett , J , Burrows , M A , del Castillo Torres , D , Chambers , F M , Cohen , A D , Evershed , R P , Feakins , S J , Galka , M , Gallego-Sala , A , Gandois , L , Gray , D M , Hatcher , P G , Honorio Coronado , E N , Hughes , P D M , Huguet , A , Kononen , M , Laggoun-Defarge , F , Lahteenoja , O , Lamentowicz , M , Marchant , R , McClymont , E , Pontevedra-Pombal , X , Ponton , C , Pourmand , A , Rizzuti , A M , Rochefort , L , Schellekens , J , De Vleeschouwer , F & Pancost , R D 2017 , ' Introducing global peat-specific temperature and pH calibrations based on brGDGT bacterial lipids ' , Geochimica et Cosmochimica Acta , vol. 208 , pp. 285-301 .
dc.identifier.other PURE: 86112228
dc.identifier.other PURE UUID: 3a7b570f-8cc0-467f-80df-bf654f06b745
dc.identifier.other WOS: 000402489500016
dc.identifier.other Scopus: 85017657540
dc.description.abstract Glycerol dialkyl glycerol tetraethers (GDGTs) are membrane-spanning lipids from Bacteria and Archaea that are ubiquitous in a range of natural archives and especially abundant in peat. Previous work demonstrated that the distribution of bacterial branched GDGTs (brGDGTs) in mineral soils is correlated to environmental factors such as mean annual air temperature (MAAT) and soil pH. However, the influence of these parameters on brGDGT distributions in peat is largely unknown. Here we investigate the distribution of brGDGTs in 470 samples from 96 peatlands around the world with a broad mean annual air temperature (-8 to 27 degrees C) and pH (3-8) range and present the first peat-specific brGDGT-based temperature and pH calibrations. Our results demonstrate that the degree of cyclisation of brGDGTs in peat is positively correlated with pH, pH = 2.49 x CBTpeat + 8.07 (n = 51, R-2 = 0.58, RMSE = 0.8) and the degree of methylation of brGDGTs is positively correlated with MAAT, MAAT(peat) (degrees C) = 52.18 x MBT'(5me) - 23.05 (n = 96, R-2 = 0.76, RMSE = 4.7 degrees C). These peat-specific calibrations are distinct from the available mineral soil calibrations. In light of the error in the temperature calibration (similar to 4.7 degrees C), we urge caution in any application to reconstruct late Holocene climate variability, where the climatic signals are relatively small, and the duration of excursions could be brief. Instead, these proxies are well-suited to reconstruct large amplitude, longer-term shifts in climate such as deglacial transitions. Indeed, when applied to a peat deposit spanning the late glacial period (similar to 15.2 kyr), we demonstrate that MAAT(peat) yields absolute temperatures and relative temperature changes that are consistent with those from other proxies. In addition, the application of MAAT(peat) to fossil peat (i.e. lignites) has the potential to reconstruct terrestrial climate during the Cenozoic. We conclude that there is clear potential to use brGDGTs in peats and lignites to reconstruct past terrestrial climate. (C) 2017 The Authors. Published by Elsevier Ltd. en
dc.format.extent 17
dc.language.iso eng
dc.relation.ispartof Geochimica et Cosmochimica Acta
dc.rights cc_by
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject GDGT
dc.subject Biomarker
dc.subject Peatland
dc.subject Calibration
dc.subject Lignite
dc.subject LATE HOLOCENE
dc.subject 1171 Geosciences
dc.subject 1172 Environmental sciences
dc.title Introducing global peat-specific temperature and pH calibrations based on brGDGT bacterial lipids en
dc.type Article
dc.contributor.organization Department of Forest Sciences
dc.description.reviewstatus Peer reviewed
dc.relation.issn 0016-7037
dc.rights.accesslevel openAccess
dc.type.version publishedVersion

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