Strong climate coupling of terrestrial and marine environments in the Miocene of northwest Europe

Donders, Timme H.; Weijers, Johan W. H.; Munsterman, D.K.; Hoeve, M.L. Kloosterboer-van; Buckles, L.K.; Pancost, Richard D.; Schouten, Stefan; Damsté, J.S. Sinninghe; Brinkhuis, Henk

doi:10.1016/j.epsl.2009.02.034

Cited by 78 publications

(69 citation statements)

References 51 publications

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“…The MBT and CBT indices are increasingly used as palaeoenvironmental proxies and have been successfully applied to the reconstruction of past air temperatures in deltaic and coastal regions (e.g. the Congo fan, Weijers et al, 2007b; the North Sea, Donders et al, 2009;Rueda et al, 2009) and very recently in Chinese loess ) based on comparison with instrumental records and/or data obtained from other proxies.…”

Section: Introductionmentioning

confidence: 99%

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Huguet¹,

Fosse

Laggoun‐Défarge

et al. 2013

Geochimica et Cosmochimica Acta

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To cite this version:Arnaud Huguet, Céline Fosse, Fatima Laggoun-Défarge, Frédéric Delarue, Sylvie Derenne. Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland. Geochimica et Cosmochimica Acta, Elsevier, 2013Elsevier, , 105, pp.294-315. 10.1016Elsevier, /j.gca.2012 Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland AbstractBranched glycerol dialkyl glycerol tetraethers (GDGTs) are complex lipids of high molecular weight, recently discovered in soils and increasingly used as palaeoclimate proxies. Their degree of methylation, expressed in the MBT, was shown to depend on mean annual air temperature (MAAT) and to a lesser extent on soil pH, whereas the relative abundance of cyclopentyl rings of branched GDGTs, expressed in the CBT, was related to soil pH. To date, only a few studies were interested in the application of the MBT and CBT proxies in peatlands. In order to validate the applicability of branched GDGTs as temperature proxies in these environments, it is essential to investigate the effect of temperature on branched GDGT-producing bacteria and especially on the speed of adaptation of these microorganisms to temperature changes. The aim of this work was to study the effects of in situ experimental climate warming on the abundance and distribution of branched GDGTs in a Sphagnum-dominated peatland (Jura Mountains, France). Branched GDGTs either present as core lipids (CLs; presumed of fossil origin) or derived from intact polar lipids (IPLs, markers for living cells) were analysed. Air temperature was experimentally increased using a passive warming system consisting of open mini-greenhouses (open-top chamber -OTC). The effect of the OTCs was especially apparent in spring and summer, with (i) an increase in maximal air temperature of ca. 3°C during these two seasons and (ii) an increase in average air temperature of ca. 1°C in summer. Despite the short duration of the climate experiment (26 months), branched GDGT distribution was significantly affected by this temperature rise, with higher MBT values in the OTCs than in the control plots, supporting the empirical relationship between MBT and MAAT established from a large range of soils. The difference in branched GDGT-derived temperatures between control and OTC plots (2-3°C) was in the same range as the increase in maximal (daytime) temperature induced by the OTCs in spring and summer, suggesting that branched GDGT-producing bacteria might be more active during the warmest months of the year. The OTC treatment had no significant effect on the abundance of branched GDGTs, which were mainly present as "fossil" CLs (70-85% of the total branched GDGT pool). Furthermore, no significant differences in branched GDGT distribution were observed between the CLs and IPLs, which both provided higher MBT and MAAT values for the OTCs. This suggests that the fossil pool of branched GDGTs has a very fast turnove...

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Section: Introductionmentioning

confidence: 99%

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Huguet¹,

Fosse

Laggoun‐Défarge

et al. 2013

Geochimica et Cosmochimica Acta

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“…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%

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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“…For stratigraphic ranges of species not shown in Fig. 3 A similar cooling at~10.5 Ma has been reported not only from northeast North Atlantic ODP Site 982 (Andersson and Jansen, 2003), but also from shallow marine deposits in northwest Europe (Donders et al, 2009). Based on pollen from continental Iceland, Mudie and Helgason (1983) proposed a drastic drop in atmospheric temperature (~10°C) at around 10 Ma, but this magnitude has been recently challenged by Denk et al (2011) who suggest a more continuous climate deterioration starting around that time.…”

Section: Glacial Inception In the Iceland Sea (~107-102 Ma)mentioning

confidence: 77%

“…Interestingly, cold-indicative silicoflagellate assemblages from the Vøring Plateau suggest a plunge in temperature at~8.5 Ma (Ciesielski and Case, 1989), as does the strong decrease in SSTs in northwest Europe at~8.4 Ma (Donders et al, 2009). Moreover, in North Atlantic ODP Site 982 a marked increase in δ 18 O occurs around 9 Ma (Andersson and Jansen, 2003), in North Atlantic ODP Site 904 at 8.7 Ma (Miller et al, 1998), in South Atlantic ODP Site 1085 at 8.8 Ma (Westerhold et al, 2005), and in the global δ 18 O composite between 8.9 and 8.7 Ma (Zachos et al, 2008), which may suggest an alternate timing for the Mi-7 event (see discussion in Westerhold et al, 2005) that broadly correspond to the changes observed in the palynomorph assemblage.…”

Section: Enhanced Cold-water Advection Into the Iceland Sea (~9-84 Ma)mentioning

confidence: 99%

Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

Schreck

Méheust

Stein

et al. 2013

Marine Micropaleontology

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The present study on ODP Leg 151 Hole 907A combines a detailed analysis of marine palynomorphs (dinoflagellate cysts, prasinophytes, and acritarchs) and a low-resolution alkenone-based sea-surface temperature (SST) record for the interval between 14.5 and 2.5 Ma, and allows to investigate the relationship between palynomorph assemblages and the paleoenvironmental evolution of the Iceland Sea. A high marine productivity is indicated in the Middle Miocene, and palynomorphs and SSTs both mirror the subsequent long-term Neogene climate deterioration. The diverse Middle Miocene palynomorph assemblages clearly diminish towards the impoverished assemblages of the Late Pliocene; parallel with a somewhat gradual decrease of SSTs being as high as 20°C at~13.5 Ma to around 8°C at~3 Ma. Superimposed, palynomorph assemblages not only reflect Middle to Late Miocene climate variability partly coinciding with the short-lived global Miocene isotope events (Mi-events), but also the initiation of a proto-thermohaline circulation across the Middle Miocene Climate Transition, which led to increased meridionality in the Nordic Seas. Last occurrences of species cluster during three events in the Late Miocene to Early Pliocene and are ascribed to the progressive strengthening and freshening of the proto-East Greenland Current towards modern conditions. A significant high latitude cooling between 6.5 and 6 Ma is depicted by the supraregional "Decahedrella event" coeval with lowest Miocene productivity and a SST decline. In the Early Pliocene, a transient warming is accompanied by surface water stratification and increased productivity that likely reflects a high latitude response to the global biogenic bloom. The succeeding crash in palynomorph accumulation, and a subsequent interval virtually barren of marine palynomorphs may be attributed to enhanced bottom water oxygenation and substantial sea ice cover, and indicates that conditions seriously affecting marine productivity in the Iceland Sea were already established well before the marked expansion of the Greenland Ice Sheet at 3.3 Ma.

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Strong climate coupling of terrestrial and marine environments in the Miocene of northwest Europe

Cited by 78 publications

References 51 publications

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

Effects of a short-term experimental microclimate warming on the abundance and distribution of branched GDGTs in a French peatland

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

Response of marine palynomorphs to Neogene climate cooling in the Iceland Sea (ODP Hole 907A)

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