A5015302018- Geology and Paleoclimatology Research
- Geological formations and processes
- Cryospheric studies and observations
- Pleistocene-Era Hominins and Archaeology
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Marine and environmental studies
- Maritime and Coastal Archaeology
- Oceanographic and Atmospheric Processes
- Arctic and Antarctic ice dynamics
- Archaeology and ancient environmental studies
- Underwater Acoustics Research
- Climate change and permafrost
- Geophysics and Gravity Measurements
- Coastal wetland ecosystem dynamics
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Marine and coastal ecosystems
- Landslides and related hazards
- Groundwater and Isotope Geochemistry
- Marine and fisheries research
- Marine animal studies overview
- Geological Studies and Exploration
- Spectroscopy and Quantum Chemical Studies
Bangor University
2014-2022
University of York
2013-2017
University of Plymouth
2011-2014
Norwegian Polar Institute
2009-2012
Vrije Universiteit Amsterdam
2002-2009
The BRITICE‐CHRONO consortium of researchers undertook a dating programme to constrain the timing advance, maximum extent and retreat British–Irish Ice Sheet between 31 000 15 years before present. campaign across Ireland Britain their continental shelves, North Sea included 1500 days field investigation yielding 18 km marine geophysical data, 377 cores sea floor sediments, geomorphological stratigraphical information at 121 sites on land; generating 690 new geochronometric ages. These...
ABSTRACT The primary variability of the composition and properties seawater is much greater in shallow coastal zones than main body ocean water. An inadequate understanding this variability, as well different diagenetic environments, severely limit interpretation stable-isotope record shoalwater carbonates. In order to investigate along a Bashkirian-Moscovian platform-to-basin transect, 13C 18O analyses have been performed on more 1000 matrix micrite, carbonate cement, brachiopod shell...
The southern North Sea is a particularly important area for understanding the behaviour of British-Irish Ice Sheet (BIIS) during last glacial cycle. It preserves record maximum extent eastern sector BIIS as well evidence multiple different ice flow phases and dynamic re-organisation BIIS. However, to date, known sheet history geochronology this region predominantly derived from onshore geological evidence, offshore imprint remain largely unknown. Using new data collected by BRITICE-CHRONO...
ABSTRACT We present a new chronology to constrain ice‐margin retreat in the northern Irish Sea Basin. Estimates on timing of ice thinning derived from surface exposure ages for boulders summits Isle Man and south‐west Cumbria suggest that was commensurate with rapid followed short‐lived advance Ice Stream (ISIS) maximum limits Celtic Sea. This Basin fastest at 20 ka response wider calving margin, but slowed as stabilized oscillated against Man. provide first age constraints Scottish...
Abstract Predicting the future response of ice sheets to climate warming and rising global sea level is important but difficult. This especially so when fast‐flowing glaciers or streams , buffered by shelves, are grounded on beds below level. What happens these shelves removed? And how do stream surrounding sheet respond abruptly altered boundary conditions? To address questions others we present new geological, geomorphological, geophysical geochronological data from ice‐stream‐dominated NW...
ABSTRACT The findings of BRITICE‐CHRONO Transect 2 through the North Sea Basin and eastern England are reported. We define ice‐sheet marginal oscillation between ~31 16 ka, with seven distinctive former limits (L1–7) constrained by Bayesian statistical analysis. southernmost limit Lobe is recorded Bolders Bank Formation (L1; 25.8–24.6 ka). L2 represents early retreat to northern edge Dogger (23.5–22.2 ka), Garret Hill Moraine in north Norfolk recording a significant regional readvance L3 at...
We present a new 300-year sea-level reconstruction from salt marsh on the Isle of Wight (central English Channel, UK) that we compare to other salt-marsh and long tide-gauge records examine spatial temporal variability in change North Atlantic. Our identifies an overall rise relative sea level (RSL) c. 0.30 m since start eighteenth century at rate 0.9±0.3 mmyr−1. Error-in-variables changepoint analysis indicates there is no statistically significant deviation constant within dataset. The...
During the Last Glacial Maximum (LGM) marine-terminating Barra Fan Ice Stream (BFIS), a major conduit of British Irish Sheet (BIIS), drained much western Scotland and northwest Ireland with ice streaming onto continental shelf Malin Sea. The extent retreat history this stream across shelf, until now, is not well known. In particular, geochronological constraints on have thus far been restricted to deep-sea cores or terrestrial cosmogenic nuclide dating onshore, ages absent. To understand...
Understanding the triggers and pace of marine-based ice sheet decay is critical for constraining future mass loss dynamic behaviour sectors large polar sheets in Greenland Antarctica. Numerical models which seek to predict this need be calibrated against data from both contemporary palaeo-ice sheets, latter requires accurate reconstruction former extent, dynamics timing. Marine geophysics, sediment cores, benthic foraminiferal assemblages radiocarbon dating are used reconstruct extent last...
The dynamics of the British-Irish Ice Sheet (BIIS) during Last Glacial were conditioned by marine-based ice streams, largest which far was Irish Sea Stream (ISIS) drained southwest across Celtic shelf. maximum extent and timing ISIS have been constrained onshore evidence from UK Ireland, glacigenic sediments encountered in a small suite vibrocores UK-Irish continental shelf, single radiocarbon date is available. These data long supported advance to at least mid-shelf, while recent results...
ABSTRACT The offshore sector around Shetland remains one of the least well‐studied parts former British–Irish Ice Sheet with several long‐standing scientific issues unresolved. These key include (i) dominance a locally sourced ‘Shetland ice cap’ vs an invasive Fennoscandian Sheet; (ii) flow configuration and style glaciation at Last Glacial Maximum (i.e. terrestrial marine glaciation); (iii) nature confluence between Sheets; (iv) cause, rate sheet separation; (v) wider implications...
In this study we present a sea surface temperature (SST) record from the western Arabian Sea for last 20,000 years. We produced centennial‐scale δ 18 O and Mg/Ca SST time series of core NIOP929 with focus on glacial‐interglacial transition. The is influenced by seasonal NE SW monsoon wind systems. Lowest SSTs occur during season because upwelling cold water, highest can be found in low‐productivity intermonsoon season. Mg/Ca‐based reflects integrated seasons. results show difference ∼2°C,...
Ice sheet mass loss is currently dominated by fast-flowing glaciers (ice streams) terminating in the ocean as ice shelves and resting on beds below sea level. The factors controlling ice-stream flow retreat over longer time scales (>100 years), especially role of three-dimensional bed shape strength, remain major uncertainties. We focus a former stream where trough substrate are known, or can be defined, to reconstruct history grounding-line movements 15 millennia since Last Glacial Maximum....
Abstract The Atlantic coast of North America north Cape Hatteras has been proposed as a “hotspot” late 20th century sea‐level rise. Here we test, using salt‐marsh proxy records, if this experienced enhanced rise over earlier multidecadal‐centennial periods. While find in agreement with previous studies that rates change were higher compared to during preceding centuries, 18th only slightly lower, suggesting the is reoccurring feature for at least three centuries. Proxy records from (Iceland)...
ABSTRACT The BRITICE‐CHRONO Project has generated a suite of recently published radiocarbon ages from deglacial sequences offshore in the Celtic and Irish seas terrestrial cosmogenic nuclide optically stimulated luminescence adjacent onshore sites. All data are integrated here with new geochronological Wales revised Bayesian analysis that enables reconstruction ice retreat dynamics across basin. Patterns changes pace deglaciation conditioned more by topographic constraints internal than...
Millennial‐scale records of planktonic foraminiferal Mg/Ca, bulk sediment U 37 K′ , and δ 18 O are presented across the last two deglaciations in core NIOP929 from Arabian Sea. Mg/Ca‐derived temperature variability during penultimate deglacial periods falls within range modern day Sea temperatures, which influenced by monsoon‐driven upwelling. The ‐derived temperatures MIS 5e similar to intermonsoon values on average 3.5°C higher than Mg/Ca same period. 1.5°C warmer Holocene, while ‐Mg/Ca...
ABSTRACT Understanding the pace and drivers of marine‐based ice‐sheet retreat relies upon integration numerical models with observations from contemporary polar ice sheets well‐constrained palaeo‐glaciological reconstructions. This paper provides a reconstruction last British–Irish Ice Sheet (BIIS) Atlantic shelf west Ireland during following Last Glacial Maximum (LGM). It uses marine‐geophysical data sediment cores dated by radiocarbon, combined terrestrial cosmogenic nuclide optically...
Abstract Belemnitellid cephalopods from the Maastrichtian stratotype area (southeast Netherlands) are shown to be comparatively well preserved. Although partial diagenetic alteration has been observed, micromilling techniques have permitted extraction of pristine belemnite calcite, suitable for reconstruction strontium (Sr), oxygen (O) and carbon (C) isotope variation seawater. A distinct Sr pattern in Maastricht record can matched stratigraphically with records Hemmoor (northern Germany),...
The Celtic Sea contains the world's largest continental shelf sediment ridges. These megaridges were initially interpreted as tidal features formed during post-glacial marine transgression, but glacigenic sediments have been recovered from their flanks. We examine stratigraphy of using new decimetric-resolution geophysical data correlated to cores test hypothetical vs glacial modes formation. comprise three main units, 1) a superficial fining-upward drape that extends across above an...
Abstract During the last glacial cycle an intriguing feature of British‐Irish Ice Sheet was North Sea Lobe (NSL); fed from Firth Forth and which flowed south parallel to English east coast. The controls on formation behaviour NSL have long been debated, but in southern recent work suggests formed a dynamic, oscillating terrestrial margin operating over deforming bed. Further north, however, little is known or under what conditions it operated. This paper analyses new acoustic, sedimentary...
Proxy based sea-level reconstructions are an important tool for defining past patterns of change and salt-marsh testate amoebae a newly emerging proxy with high potential as indicators. This study develops existing analytical techniques con- cerned the preparation counting studies demonstrates predictive power this group micro-organisms. Two salt marshes in northwestern Norway were sampled multiple sub-samples prepared using different procedures count totals. Analytical efficiency can be...