A5049203389- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Geological Studies and Exploration
- Arctic and Russian Policy Studies
- Heavy metals in environment
- Paleontology and Stratigraphy of Fossils
- Atmospheric and Environmental Gas Dynamics
- Geological and Geochemical Analysis
- Marine and environmental studies
- Geochemistry and Geologic Mapping
- Scientific Research and Discoveries
- Marine and coastal ecosystems
- Groundwater and Isotope Geochemistry
- Mine drainage and remediation techniques
- Oceanographic and Atmospheric Processes
- Pleistocene-Era Hominins and Archaeology
- Maritime and Coastal Archaeology
- Historical Studies of British Isles
- Cryospheric studies and observations
- Archaeology and ancient environmental studies
University of Edinburgh
2018-2019
Scottish Association For Marine Science
2014-2018
Imperial College London
2012-2017
University of Bristol
2011-2013
The neodymium (Nd) isotopic composition of seawater is commonly used as a proxy to study past changes in the thermohaline circulation. modern database for such reconstructions however poor and understanding underlying processes incomplete. Here we present new observational data Nd isotopes concentrations from twelve depth profiles, which follow flow path North Atlantic Deep Water (NADW) its formation region northern equatorial Atlantic. Samples were collected during two cruises constituting...
One of the key activities during initial phase international GEOTRACES program was an extensive intercalibration effort, to ensure that results for a range trace elements and isotopes (TEIs) from different cruises laboratories can be compared in meaningful way. Here we present efforts on neodymium rare earth seawater marine particles. Fifteen reported dissolved 143 Nd/ 144 Nd ratios at three locations (BATS 15 m, BATS 2000 SAFe 3000 m), with overall agreement within 47 57 ppm (2σ standard...
Seawater rare earth element (REE) concentrations are increasingly applied to reconstruct water mass histories by exploiting relative changes in the distinctive normalised patterns. However, mechanisms which masses gain their patterns yet be fully explained. To examine this, we collected samples along Extended Ellett Line (EEL), an oceanographic transect between Iceland and Scotland, measured dissolved REE offline automated chromatography (SeaFAST) ICP-MS. The proximity two continental...
Research Article| June 01, 2011 Persistent Nordic deep-water overflow to the glacial North Atlantic K.C. Crocket; Crocket * 1Bristol Isotope Group, School of Geographical Sciences, University Bristol, Road, Bristol BS8 1SS, UK *Current address: Earth Science and Engineering, Imperial College London, Royal Mines Building, Prince Consort London SW7 2AZ, UK; E-mail: k.crocket@imperial.ac.uk. Search for other works by this author on: GSW Google Scholar D. Vance; Vance 2Bristol Department Wills...
Abstract The last deglaciation was characterized by a series of millennial‐scale climate events that have been linked to deep ocean variability. While often implied in interpretations, few direct constraints exist on circulation changes at mid‐depths. Here we provide new the variability deglacial mid‐depth using combined radiocarbon and neodymium isotopes 24 North Atlantic deep‐sea corals. Their aragonite skeletons dated uranium‐series, providing absolute ages resolution record...
Cold-water corals (CWCs) are unique archives of mid-depth ocean chemistry and have been used successfully to reconstruct the neodymium (Nd) isotopic composition seawater from a number species. High variable Nd concentrations in fossil however pose question as how is incorporated into their skeletons. We here present new results on modern specimens Desmophyllum dianthus, Balanophyllia malouinensis, Flabellum curvatum, collected Drake Passage, Madrepora oculata, North Atlantic. All individuals...
Understanding the history of continental ice-sheet growth on North America, and in particular that Laurentide Ice Sheet (LIS), is important for palaeoclimate sea-level reconstructions. Information extent pre-dating Last Glacial Maximum (LGM) heavily reliant, though, outputs numerical models underpinned by scant geological data. Important aspects LIS remain unresolved include timing its collapse during Termination 2, first time it expanded significantly Cycle, whether volume was reduced...
Abstract Isotopes of the actinide elements protactinium (Pa), thorium (Th), and uranium (U), lanthanide element neodymium (Nd) are often used as complementary tracers modern past oceanic processes. The extraction such from low abundance matrices, seawater carbonate, is however labor‐intensive requires significant amounts sample material. We here present a combined method for Pa, Th, Nd 5 to 10 L samples, U, <1 g carbonate samples. Neodymium collected in respective wash fractions Pa‐Th...
Significance Southern Ocean circulation is a central aspect of the climate system influenced by overlying Hemisphere westerly winds (SWW) and surface buoyancy forcing. Yet, response water mass mixing to SWW changes largely unconstrained for Holocene (the last ∼11,700 y). We extracted fingerprint ocean chemistry from Drake Passage cold-water corals trace past mixing. Our data suggest that poleward weakening in Middle led increased admixture CO 2 -rich Pacific-derived masses into Ocean. These...
Circumpolar Deep Water (CDW) and Antarctic Bottom (AABW) play key roles in the Earth's climate system. Both water masses form critical components of Current Meridional Overturning Circulation therefore directly influence large-scale redistribution heat, nutrients carbon. Reconstruction past CDW transport AABW production export has been a target palaeoceanography. One promising proxy to achieve this neodymium (Nd) isotope composition seawater. The biogeochemical processes controlling Nd...
<p>[Introduction]: "The Arctic is the fastest changing region on planet. It also intrinsically tied to global processes, whether they are climatic, environmental or socio-economic. The impacts of climate change vast and multiple interacting systems inherently complex, although can be broadly summarised as an increase in temperature subsequent loss sea-ice cover. This will ultimately result emergence new physical ecological states. rapidity with which reacting extraordinary. leading...
<p>[Introduction]: "The Arctic is the fastest changing region on planet. It also intrinsically tied to global processes, whether they are climatic, environmental or socio-economic. The impacts of climate change vast and multiple interacting systems inherently complex, although can be broadly summarised as an increase in temperature subsequent loss sea-ice cover. This will ultimately result emergence new physical ecological states. rapidity with which reacting extraordinary. leading...