Introducing global peat-specific temperature and pH calibrations based on brGDGT bacterial lipids
PBN-AR
Instytucja
Wydział Nauk Geograficznych i Geologicznych (Uniwersytet im. Adama Mickiewicza w Poznaniu)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Geochimica et Cosmochimica Acta (45pkt w roku publikacji)
ISSN
0016-7037
EISSN
Wydawca
PERGAMON-ELSEVIER SCIENCE LTD
DOI
URL
Rok publikacji
2017
Numer zeszytu
Strony od-do
285-301
Numer tomu
208
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
2,50
Słowa kluczowe
en
GDGT; Biomarker; Peatland; Calibration; Lignite
Streszczenia
Język
en
Treść
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 ?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 ? CBTpeat + 8.07 (n = 51, R2 = 0.58, RMSE = 0.8) and the degree of methylation of brGDGTs is positively correlated with MAAT, MAATpeat (?C) = 52.18 ? MBT0 5me ? 23.05 (n = 96, R2 = 0.76, RMSE = 4.7 ?C). These peat-specific calibrations are distinct from the available mineral soil calibrations. In light of the error in the temperature calibration (?4.7 ? 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 (?15.2 kyr), we demonstrate that MAATpeat yields absolute temperatures and relative temperature changes that are consistent with those from other proxies. In addition, the application of MAATpeat 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.
Cechy publikacji
discipline:Biochemia – dziedzina nauk biologicznych
discipline:Biotechnologia – dziedzina nauk biologicznych
discipline:Chemia
discipline:Geografia
discipline:Ochrona środowiska – dziedzina nauk chemicznych
discipline:Biochemistry – field of biological sciences
discipline:Biotechnology – field of biological sciences
discipline:Chemistry
discipline:Geography
discipline:Environmental protection – field of chemical sciences
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:855918
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