A5017660188- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Climate change and permafrost
- Arsenic contamination and mitigation
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Isotope Analysis in Ecology
- Mine drainage and remediation techniques
- Paleontology and Stratigraphy of Fossils
- Heavy metals in environment
- Arctic and Antarctic ice dynamics
- Geochemistry and Geologic Mapping
- Microbial Community Ecology and Physiology
- Groundwater and Isotope Geochemistry
- Evolution and Paleontology Studies
- Paleontology and Evolutionary Biology
- Marine and coastal ecosystems
- Archaeology and ancient environmental studies
- Geological and Geochemical Analysis
- Paleopathology and ancient diseases
- melanin and skin pigmentation
- Radioactive element chemistry and processing
- Forensic Anthropology and Bioarchaeology Studies
- Cultural Heritage Materials Analysis
University of Manchester
2016-2025
Bolin Centre for Climate Research
2010-2021
Stockholm University
2008-2021
Williams (United Kingdom)
2015-2020
Indiana University – Purdue University Indianapolis
2020
Atmospheric and Environmental Research
2014-2015
Williams (United States)
2009-2015
Williamson College
2009
University of Bristol
2004-2008
Royal Netherlands Institute for Sea Research
2000-2006
Research Article| March 01, 2007 Stable warm tropical climate through the Eocene Epoch Paul N. Pearson; Pearson 1School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, CF10 3YE, UK Search for other works by this author on: GSW Google Scholar Bart E. van Dongen; Dongen 2Organic Geochemistry Unit, Bristol Biogeochemistry Centre, School Chemistry, University Bristol, Cantock's Close, BS8 1TS, Christopher J. Nicholas; Nicholas 3Department Geology, Trinity...
Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect challenging assess due the diverse processes controlling release various organic (OC) pools from heterogeneous landscapes. Here, by radiocarbon dating terrestrial OC components in fluvially and coastally integrated estuarine sediments, we present a unique framework for deconvoluting contrasting mobilization mechanisms surface vs. deep (permafrost) across climosequence Eurasian...
Recently, acidic ionic liquid water mixtures based on the hydrogen sulfate anion have been shown to effectively extract lignin from lignocellulosic biomass.
Summary While it is known that interactions between plants and soil fungi drive many essential ecosystem functions, considerable uncertainty exists over the drivers of fungal community composition in rhizosphere. Here, we examined roles plant species identity, phylogeny functional traits shaping rhizosphere communities tested robustness these relationships to environmental change. We conducted a glasshouse experiment consisting 21 temperate grassland grown under three different treatments...
ABSTRACT Microbes may play a key role in the mobilization of arsenic present elevated concentrations within aquifers extensively exploited for irrigation and drinking water West Bengal, Bangladesh, other regions South‐East Asia. Microcosm experiments using Cambodian sediments (which are also representative similar reducing containing arsenic‐rich waters) show that release iron reduction microbially mediated demonstrate type organic matter present, not necessarily total abundance matter, is...
Climate change is expected to have a strong effect on the Eastern Siberian Arctic Shelf (ESAS) region, which includes 40% of shelves and comprises Laptev East seas. The largest organic carbon pool, dissolved (DOC), may significantly due changes in both riverine inputs transformation rates; however, present DOC inventories patterns are poorly understood. Using samples from International Study 2008, this study examines for first time removal shelf waters with residence times that range months...
Abstract. Over decadal-centennial timescales, only a few mechanisms in the carbon-climate system could cause massive net redistribution of carbon from land and ocean systems to atmosphere response climate warming. The largest such climate-vulnerable pool is old organic (OC) stored Arctic permafrost (perennially frozen) soils. Climate warming, both predicted now observed be strongest globally Eurasian Alaska, causes thaw-release local tundra sites. However, central challenge for assessment...
A decade ago, reports that organic-rich soft tissue survived from dinosaur fossils were apparently supported by proteomics-derived sequence information of exceptionally well-preserved bone. This initial claim to the sequencing endogenous collagen peptides an approximately 68 Myr Tyrannosaurus rex fossil was highly controversial, largely on grounds potential contamination either bacterial biofilms or laboratory practice. In a subsequent study, peptide sequences 78 Brachylophosaurus canadensis...
Surface sediments outside the great Russian Arctic rivers (GRARs; Ob, Yenisey, Lena, Indigirka, and Kolyma) were investigated for their lipid biomarker composition to elucidate compositional distinctions of exported organic matter (OM) across this continent‐scale climosequence Siberian Arctic. The is dominantly terrestrial (high molecular weight (HMW) n ‐alkanols, ‐alkanoic acids, ‐alkanes; branched glycerol dialkyl tetraethers (GDGTs), β ‐sitosterol, other sterols, triterpenoids) with only...
Abstract High arsenic concentrations in groundwater are causing a humanitarian disaster Southeast Asia. It is generally accepted that microbial activities play critical role the mobilization of from sediments, with metal‐reducing bacteria stimulated by organic carbon implicated. However, detailed mechanisms underpinning these processes remain poorly understood. Of particular importance nature driving reduction sorbed As(V) to more mobile As(III), and interplay between iron sulphide minerals...
Centennial‐scale records of sea‐surface temperature and opal composition spanning the Last Glacial Maximum Termination 1 (circa 25–6 ka) are presented here from Guaymas Basin in Gulf California. Through application two organic geochemistry proxies, U 37 K′ index TEX 86 H index, we present evidence for rapid, stepped changes temperatures during deglaciation. These occur both proxies at 13 ka (∼3°C increase 270 years), 10.0 (∼2°C decrease over ∼250 years) 8.2 (3°C <200 years). An additional...
[1] Fluvial and erosional release processes in permafrost-dominated Eurasian Arctic cause transport of large amounts particulate organic carbon (POC) to coastal waters. The marine fate this terrestrial POC (terr-POC), water column degradation, burial shelf sediments, or export depth, impacts the potential for climate-carbon feedback. As part International Siberian Shelf Study (ISSS-08; August–September 2008), distribution, inventory, extensive yet poorly studied seas were investigated....
Two commonly used proxies based on the distribution of glycerol dialkyl tetraethers (GDGTs) are TEX 86 (TetraEther indeX carbon atoms) paleothermometer for sea surface temperature reconstructions and BIT (Branched Isoprenoid Tetraether) index reconstructing soil organic matter input to ocean. An initial round‐robin study two sediment extracts, in which 15 laboratories participated, showed relatively consistent values (reproducibility ±3–4°C when translated temperature) but a large spread...
The saccharification of wheat straw was improved when an incubation step performed with<italic>Trametes versicolor</italic>laccase (TvL) and the mediator 1-hydroxybenzotriazole (1-HBT) prior to alkaline peroxide extraction (APE).
Abstract Fossil melanin granules (melanosomes) are an important resource for inferring the evolutionary history of colour and its functions in animals. The taphonomy melanosomes, however, is incompletely understood. In particular, chemical processes responsible melanosome preservation have not been investigated. As a result, origins sulfur‐bearing compounds fossil melanosomes difficult to resolve. This has implications interpretations original fossils based on potential sulfur‐rich...
Recent progress has been made in paleontology with respect to resolving pigmentation fossil material. Morphological identification of fossilized melanosomes one approach, while a second methodology using chemical imaging and spectroscopy also provided critical information particularly concerning eumelanin (black pigment) residue. In this work we develop the show that organosulfur-Zn complexes are indicators pheomelanin (red extant soft tissue mapping these residual biochemical compounds can...
Abstract. Biogeochemical cycling in the semi-enclosed Arctic Ocean is strongly influenced by land–ocean transport of carbon and other elements vulnerable to environmental climate changes. Sediments are an important part biogeochemical provide opportunity study present historical input fate organic matter (e.g., through permafrost thawing). Comprehensive sedimentary records required compare differences between regions budgets. To this end, Circum-Arctic Sediment CArbon DatabasE (CASCADE) was...
Abstract Enhanced warming of the Northern high latitudes has intensified thermokarst processes throughout permafrost zone. Retrogressive thaw slumps (RTS), where thaw-driven erosion caused by ground ice melt creates terrain disturbances extending over tens hectares, represent particularly dynamic features. Biogeochemical transformation mobilized substrate may release CO 2 to atmosphere and impact downstream ecosystems, yet its fate remains unclear. The Peel Plateau in northwestern Canada...
Oil spills are a global challenge, contaminating the environment with organics and metals known to elicit toxic effects. Ecosystems within Nigeria's Niger Delta have suffered from prolonged severe for many decades but level of impact on soil microbial community structure potential contaminant bioremediation remains unclear. Here, we assessed extent/impact an oil spill in this area 6 months after accident both community/diversity distribution polycyclic aromatic hydrocarbon ring-hydroxylating...
MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 232:83-92 (2002) - doi:10.3354/meps232083 Carbon isotope variability in monosaccharides and lipids of aquatic algae terrestrial plants Bart E. van Dongen*, Stefan Schouten, Jaap S. Sinninghe Damsté Department Biogeochemistry Toxicology, Royal Netherlands Institute for Sea Research (NIOZ), PO Box 59, 1790 AB...
An extremely well-preserved dinosaur ( Cf. Edmontosaurus sp.) found in the Hell Creek Formation (Upper Cretaceous, North Dakota) retains soft-tissue replacement structures and associated organic compounds. Mineral cements precipitated skin apparently follow original cell boundaries, partially preserving epidermis microstructure. Infrared electron microprobe images of ossified tendon clearly show preserved mineral zonation, with silica trapped carbon dioxide forming thin linings on Haversian...