Stefan Schouten
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View article: Adaptation and response of verrucomicrobial methanotrophs to heat and acidity
Adaptation and response of verrucomicrobial methanotrophs to heat and acidity Open
Acidophilic microorganisms thrive in environments where the external pH is orders of magnitude lower than their intracellular pH. Verrucomicrobial methanotrophs of the family Methylacidiphilaceae , including Methylacidiphilum and Methylaci…
View article: Substantial contribution of <i>in situ</i> produced bacterial lipids to the sedimentary lipidome
Substantial contribution of <i>in situ</i> produced bacterial lipids to the sedimentary lipidome Open
The sedimentary lipid pool is comprised of a myriad of individual components. Due to their importance for organic carbon sequestration and their application in paleoclimatic and geobiological reconstructions, its composition has been studi…
View article: Perturbation increases source-dependent organic matter degradation rates in estuarine sediments
Perturbation increases source-dependent organic matter degradation rates in estuarine sediments Open
Despite a relatively small surface area on Earth, estuaries play a disproportionally important role in the global carbon cycle due to their relatively high primary production and rapid organic carbon processing. Estuarine sediments are hig…
View article: Stable Middle Miocene Seawater Isotopes in the Eastern North Atlantic Ocean
Stable Middle Miocene Seawater Isotopes in the Eastern North Atlantic Ocean Open
The Middle Miocene is characterized by a long‐term increase in the stable oxygen isotopic composition of benthic foraminifera ( δ 18 O benthic ). However, it is unclear to what extent this increase reflects changes in seawater isotopic com…
View article: Large variability and 2H-depletion of Middle Miocene to Pleistocene alkenone hydrogen isotopes in the Equatorial Pacific reflect subsurface, low light haptophyte growth
Large variability and 2H-depletion of Middle Miocene to Pleistocene alkenone hydrogen isotopes in the Equatorial Pacific reflect subsurface, low light haptophyte growth Open
Hydrogen isotope ratios of haptophyte derived long-chain alkenones (δ2HC37:2) have shown to be a useful tool for reconstructing past isotopic compositions of surface seawater (δ2HSSW). The δ2Hssw is related to global ice volume, sea surfac…
View article: Glacial-interglacial contrasts in the marine inorganic carbon chemistry of the Benguela Upwelling System
Glacial-interglacial contrasts in the marine inorganic carbon chemistry of the Benguela Upwelling System Open
Upwelling regions are dynamic systems where relatively cold, nutrient- and CO2-rich waters reach to the surface from the deep. CO2 sink or source properties of these regions are dependent not only on the dissolved inorganic carbon content …
View article: Continuous sterane and phytane δ13C record reveals a substantial pCO2 decline since the mid-Miocene
Continuous sterane and phytane δ13C record reveals a substantial pCO2 decline since the mid-Miocene Open
Constraining the relationship between temperature and atmospheric concentrations of carbon dioxide ( p CO 2 ) is essential to model near-future climate. Here, we reconstruct p CO 2 values over the past 15 million years (Myr), providing a s…
View article: A search for biomarker evidence of an intermittent deep-sea hypersaline anoxic basin in the eastern Mediterranean during the Early Pliocene
A search for biomarker evidence of an intermittent deep-sea hypersaline anoxic basin in the eastern Mediterranean during the Early Pliocene Open
Deep-sea hypersaline anoxic basins (DHABs) are extreme environments harbouring unique microbial assemblages. They have, however, rarely been identified in the geological record. Here, we investigate the potential use of organic biomarkers …
View article: Impact of water depth on the distributions and proxies of isoprenoidal hydroxylated GDGTs in the Mediterranean Sea and the Red Sea
Impact of water depth on the distributions and proxies of isoprenoidal hydroxylated GDGTs in the Mediterranean Sea and the Red Sea Open
Hydroxylated Isoprenoidal Glycerol Dialkyl Glycerol Tetraethers (OH-isoGDGTs) have recently been utilized as paleothermometers in the marine environment. However, their ability to reconstruct temperature in the Mediterranean and Red Sea ha…
View article: Evolution of winter precipitation in the Nile river watershed since the last glacial
Evolution of winter precipitation in the Nile river watershed since the last glacial Open
Between 14.5 and 5 ka, the Sahara was vegetated owing to a wet climate during the African humid period. However, the climatic factors sustaining the “green Sahara” are still a matter of debate. Particularly the role of winter precipitation…
View article: Sea surface temperature variations in the Eastern Equatorial Pacific (ODP Site 1240) over the last 160 kyr from three lipid paleothermometers (UK'37, TEXH86 and LDI)
Sea surface temperature variations in the Eastern Equatorial Pacific (ODP Site 1240) over the last 160 kyr from three lipid paleothermometers (UK'37, TEXH86 and LDI) Open
The Pacific Ocean equatorial upwelling region is of great interest to understand climate dynamics within the context of current global change. It plays a key role in global biogeochemical cycles, especially in the carbon cycle, as it stand…
View article: Assessing redox-related biotic changes during the Sinemurian&#8211;Pliensbachian transition in the Lusitanian Basin, Portugal
Assessing redox-related biotic changes during the Sinemurian–Pliensbachian transition in the Lusitanian Basin, Portugal Open
The geochemical record of the Early Jurassic Sinemurian–Pliensbachian transition (S–P transition; ~193 Ma) is marked by a prominent negative carbon-isotope excursion and a short-lived increase in pCO2. The paleoenvironment…
View article: Stable Middle Miocene seawater isotopes in the eastern North Atlantic Ocean
Stable Middle Miocene seawater isotopes in the eastern North Atlantic Ocean Open
The Middle Miocene is a phase of gradual climate cooling, CO2 decline and major episodes of seaward Antarctic ice expansion across the Middle Miocene Climate Transition. The global benthic foraminifera oxygen isotopes (δ18Obenthic) sh…
View article: Stable Middle Miocene seawater isotopes in the eastern North Atlantic Ocean
Stable Middle Miocene seawater isotopes in the eastern North Atlantic Ocean Open
The Middle Miocene is characterized by a long-term increase in the oxygen isotopes of benthic foraminifera (δO). However, it is unclear to what extent this increase reflects changes in seawater isotopes or deep water temperature. We presen…
View article: Evaluating isoprenoidal hydroxylated GDGT-based temperature proxies in surface sediments from the global ocean
Evaluating isoprenoidal hydroxylated GDGT-based temperature proxies in surface sediments from the global ocean Open
Recently developed temperature proxies based on hydroxylated isoprenoid Glycerol Dialkyl Glycerol Tetraethers (OH-isoGDGTs), such as %OH, RI-OH, RI-OH′ and OHC, have shown potential for reconstructing past temperature changes. However, pro…
View article: Glacial–interglacial seawater isotope change near the Chilean Margin as reflected by <i>δ</i> <sup>2</sup> H values of C <sub>37</sub> alkenones
Glacial–interglacial seawater isotope change near the Chilean Margin as reflected by <i>δ</i> <sup>2</sup> H values of C <sub>37</sub> alkenones Open
Stable hydrogen isotopic compositions of long-chain alkenones with 37 carbon atoms (δ2HC37) have been shown to reflect seawater salinity in culture and environmental studies, and this potential sea surface salinity proxy has been applied t…
View article: Constraining Water Depth Influence on Organic Paleotemperature Proxies Using Sedimentary Archives
Constraining Water Depth Influence on Organic Paleotemperature Proxies Using Sedimentary Archives Open
The TEX 86 paleothermometer has been extensively used to reconstruct past sea water temperatures, but it remains unclear which export depths the proxy represents. Here we used a novel approach to better constrain the proxy recording depths…
View article: Glacial-interglacial sea water isotope change near the Chilean Margin as reflected by δ <sup>2</sup> H of C37 alkenones
Glacial-interglacial sea water isotope change near the Chilean Margin as reflected by δ <sup>2</sup> H of C37 alkenones Open
Hydrogen isotopic compositions of C37 long chain alkenones (δ2HC37) have been proposed as a proxy for past seawater salinity and applied in several regions. However, previous studies were based solely on a single core and often suggested u…
View article: Isoprenoidal GDGTs and GDDs associated with anoxic lacustrine environments
Isoprenoidal GDGTs and GDDs associated with anoxic lacustrine environments Open
We examined membrane-spanning archaeal lipids using ultra high pressure liquid chromatography-high resolution mass spectrometry (UHPLC-HRMS) in a suite of sediment samples from both cored sequences (Messel oil shale and Lake Chala) and sur…
View article: Sea surface temperature evolution of the North Atlantic Ocean across the Eocene-Oligocene Transition
Sea surface temperature evolution of the North Atlantic Ocean across the Eocene-Oligocene Transition Open
When a permanent ice cap developed on Antarctica during the Eocene–Oligocene transition (EOT; ~34.44 to 33.65 million years ago (Ma)), Earth witnessed a transition from a greenhouse towards a glacially driven climate. Evidence of hig…
View article: Sea surface temperature evolution of the North Atlantic Ocean across the Eocene–Oligocene transition
Sea surface temperature evolution of the North Atlantic Ocean across the Eocene–Oligocene transition Open
A major step in the long-term Cenozoic evolution toward a glacially driven climate occurred at the Eocene–Oligocene transition (EOT), ∼34.44 to 33.65 million years ago (Ma). Evidence for high-latitude cooling and increased latitudinal temp…
View article: A 15-million-year surface- and subsurface-integrated TEX <sub>86</sub> temperature record from the eastern equatorial Atlantic
A 15-million-year surface- and subsurface-integrated TEX <sub>86</sub> temperature record from the eastern equatorial Atlantic Open
TEX86 is a paleothermometer based on Thaumarcheotal glycerol dialkyl glycerol tetraether (GDGT) lipids and is one of the most frequently used proxies for sea-surface temperature (SST) in warmer-than-present climates. However, GDGTs are not…
View article: The origin of unusual Pliocene sapropel and diatomite layers: A case study for future climate projections
The origin of unusual Pliocene sapropel and diatomite layers: A case study for future climate projections Open
<p>Distinctive organic-rich sapropel layers found in the Eastern Mediterranean are associated with stratification-linked reduction in ventilation and enhanced primary productivity resulting from freshwater outflow during precession m…
View article: Sea surface temperature evolution of the North Atlantic Ocean across the Eocene-Oligocene Transition
Sea surface temperature evolution of the North Atlantic Ocean across the Eocene-Oligocene Transition Open
A major step in the long-term Cenozoic evolution toward a glacially-driven climate occurred at the Eocene Oligocene Transition (EOT), ~34.44 to 33.65 million years ago (Ma). Evidence for high latitude cooling and increased latitudinal temp…