A5010321851- Geology and Paleoclimatology Research
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Marine and coastal ecosystems
- Paleontology and Stratigraphy of Fossils
- Geological Studies and Exploration
- Hydrocarbon exploration and reservoir analysis
- Geological formations and processes
- Ocean Acidification Effects and Responses
- Isotope Analysis in Ecology
- Seismic Imaging and Inversion Techniques
- Evolution and Paleontology Studies
- Reservoir Engineering and Simulation Methods
- Marine and environmental studies
- Marine and coastal plant biology
- Marine Bivalve and Aquaculture Studies
- Marine and fisheries research
- Calcium Carbonate Crystallization and Inhibition
- Pleistocene-Era Hominins and Archaeology
- Offshore Engineering and Technologies
- Microbial Community Ecology and Physiology
- Protist diversity and phylogeny
- Diatoms and Algae Research
- Algal biology and biofuel production
Uppsala University
2014-2023
University of Oslo
2012-2020
Adelphi University
2018
International Ocean Discovery Program
2017
Stockholm University
2002-2010
Vrije Universiteit Amsterdam
2005
ETH Zurich
2001-2002
École Polytechnique Fédérale de Lausanne
2001
Abstract Rapid changes in ocean circulation and climate have been observed marine-sediment ice cores over the last glacial period deglaciation, highlighting non-linear character of system underlining possibility rapid shifts response to anthropogenic greenhouse gas forcing. To date, these are still not fully explained. One obstacle hindering progress our understanding interactions between past is difficulty accurately dating marine cores. Here, we present a set 92 sediment from Atlantic...
Antarctica glaciation began soon after a large decrease in the concentration of atmospheric carbon dioxide around 35 million years ago.
Abstract The Miocene epoch (23.03–5.33 Ma) was a time interval of global warmth, relative to today. Continental configurations and mountain topography transitioned toward modern conditions, many flora fauna evolved into the same taxa that exist climate dynamic: long periods early late glaciation bracketed ∼2 Myr greenhouse interval—the Climatic Optimum (MCO). Floras, faunas, ice sheets, precipitation, p CO 2 , ocean atmospheric circulation mostly (but not ubiquitously) covaried with these...
Coccolithophores are one of the most abundant eukaryotic phytoplankton in oceans and distinguished by their ability to build calcitic platelets (coccoliths). Of numerous species, Emiliania huxleyi is considered major calcifiers pelagic ocean. There growing concern that increasing levels CO2 atmosphere subsequent acidification ocean may disrupt production coccoliths. Furthermore, any change global distribution abundance E. relative non-calcifying groups (e.g. diatoms) will have important...
Abstract Late Miocene to mid‐Pleistocene sedimentary proxy records reveal that northwest Australia underwent an abrupt transition from dry humid climate conditions at 5.5 million years (Ma), likely receiving year‐round rainfall, but after ~3.3 Ma, shifted toward increasingly seasonal precipitation regime. The progressive constriction of the Indonesian Throughflow decreased continental humidity and transferred control Australian Pacific Indian Ocean, leading drier punctuated by monsoonal...
Global climate underwent a major reorganization when the Antarctic ice sheet expanded ~14 million years ago (Ma) (1). This event affected global atmospheric circulation, including strength and position of westerlies Intertropical Convergence Zone (ITCZ), and, therefore, precipitation patterns (2-5). We present new shallow-marine sediment records from continental shelf Australia (International Ocean Discovery Program Sites U1459 U1464) providing first empirical evidence linking high-latitude...
Abstract The Pliocene was characterized by a gradual shift of global climate toward cooler and drier conditions. This fundamentally reorganized Earth's from the Miocene state conditions similar to present. During Pliocene, progressive restriction Indonesian Throughflow (ITF) is suggested have enhanced this stronger meridional thermal gradients. Reduced ITF, caused northward movement Australia uplift Indonesia, impeded thermohaline circulation, also contributing late Northern Hemisphere...
Abstract. All species of coccolithophore appear to respond perturbations carbonate chemistry in a different way. Here, we show that the degree malformation, growth rate and stable isotopic composition organic matter produced by two contrasting (Gephyrocapsa oceanica Coccolithus pelagicus ssp. braarudii) are indicative differences between their photosynthetic calcification response changing DIC levels (ranging from ~1100 ~7800 μmol kg−1) at constant pH (8.13 ± 0.02). Gephyrocapsa thrived...
Abstract Ocean gateways facilitate circulation between ocean basins, thereby impacting global climate. The Indonesian Gateway transports water from the Pacific to Indian via Throughflow (ITF) and drives strength intensity of modern Leeuwin Current, which carries warm equatorial waters along western coast Australia higher latitudes. Therefore, ITF dynamics are a vital component thermohaline circulation. Plio‐Pleistocene changes in behavior Current remain poorly constrained due lack...
The late Miocene-early Pliocene biogenic bloom was an extended time interval characterised by elevated ocean export productivity at numerous locations. As primary is nutrient-limited low-to-mid latitudes, this has been attributed to increase or a redistribution of available nutrients, potentially involving ocean-gateway monsoon-related mechanisms. While the exact causal feedbacks remain debated, there even less consensus on what caused end bloom. Here, we compile Mio-Pliocene...
Long‐term alkenone‐based p CO 2 records are widely applied in paleoclimate evaluations. These estimates based on of the carbon isotope fractionation that occurs during marine haptophyte photosynthesis (ɛ 37:2 ). In addition to concentration aqueous (CO 2(aq) ) magnitude ɛ is also influenced by algal growth rates and cell geometry. To date, influence geometry expression ancient values has received little attention. This study evaluates changes alkenone‐producing algae at Deep See Drilling...
This study investigates ancient alkenone producers among the late Oligocene–early Miocene coccolithophores recorded at Deep Sea Drilling Project (DSDP) Site 516. Contrary to common assumptions, Reticulofenestra was not most important producer throughout studied time interval. The comparison between coccolith species‐specific absolute abundances and contents in same sedimentary samples shows that Cyclicargolithus explain 40% of total variance concentration species floridanus a major producer,...
Abstract Calcifying phytoplankton play an important role in marine ecosystems and global biogeochemical cycles, affecting the transfer of both organic inorganic carbon from surface to deep ocean. Coccolithophores are most prominent members this group, being well adapted low‐nutrients environments (e.g., subtropical gyres). Despite urgent concerns, their response rising atmospheric dioxide levels ( p CO 2 ) ocean acidification is still poorly understood, short‐term experiments may not...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 448:51-66 (2012) - DOI: https://doi.org/10.3354/meps09535 Environmental controls on Emiliania huxleyi morphotypes in Benguela coastal upwelling system (SE Atlantic) Jorijntje Henderiks1,*, Amos Winter2, Malte Elbrächter3, Rainer Feistel4, Anja van der Plas5, Guenther Nausch4, Ray Barlow6 1Department of Earth...