A5006883877- Geology and Paleoclimatology Research
- Pleistocene-Era Hominins and Archaeology
- Methane Hydrates and Related Phenomena
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Archaeology and ancient environmental studies
- Geological formations and processes
- Cryospheric studies and observations
- Maritime and Coastal Archaeology
- Climate change and permafrost
- Pacific and Southeast Asian Studies
- Paleontology and Stratigraphy of Fossils
- Oceanographic and Atmospheric Processes
- Marine Biology and Ecology Research
- earthquake and tectonic studies
- Archaeological and Geological Studies
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- High-pressure geophysics and materials
- Mineralogy and Gemology Studies
- Underwater Acoustics Research
- Geochemistry and Geologic Mapping
- Marine animal studies overview
- Geological Studies and Exploration
Swansea University
2013-2024
University of Southampton
2018-2023
Queen Mary University of London
2020-2023
Royal Holloway University of London
2010-2015
Quaternary Research Association
2012
Abstract. A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring annual layer counted Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from NGRIP to NEEM using 787 match points of mainly volcanic origin identified in electrical conductivity measurement (ECM) dielectrical profiling (DEP) records. Tephra horizons found both cores are used test matching based on ECM DEP provide five additional timescale...
Abstract The emerging tephrostratigraphy of NW Europe spanning the last termination (ca. 15–9 ka) provides potential for synchronizing marine, ice‐core and terrestrial records, but is currently compromised by stratigraphic complications, geochemical ambiguity imprecise age estimates some layers. Here we present new tephrostratigraphic, radiocarbon chironomid‐based palaeotemperature data from Abernethy Forest, Scotland, that refine ages positions Borrobol Penifiler tephras. Tephra...
Abstract Widespread ash dispersal poses a significant natural hazard to society, particularly in relation disruption aviation. Assessing the extent of threat far-travelled clouds on flight paths is substantially hindered by an incomplete volcanic history and underestimation potential reach distant eruptive centres. The risk extensive aviation thus poorly quantified. New evidence presented explosive Late Pleistocene eruptions Pacific Arc, currently undocumented proximal geological record,...
Chemical profiles from Greenland ice cores show that the frequency of volcanism was higher during last glacial-interglacial transition (LGIT) and early Holocene, (17–9 ka b2k) than in any other period 110 kyr. This increased has partly been linked to climate-driven melting Icelandic sheet deglaciation, with regional isostatic changes thought alter mantle viscosity lead more eruptions. Our study is first construct a comprehensive tephrochronological framework over LGIT aid reconstruction...
Polar ice-cores have long been recognised as unrivalled repositories of past volcanic events. Although tephra products from local eruptions tend to dominate these records, improvements in micro-sampling and analytical techniques are uncovering a growing number cryptotephras erupted exceptionally distant volcanoes. We present series nine Middle Holocene cryptotephra deposits detected within the NGRIP ice-core that originate five different regions across Northern Hemisphere (Alaska, Cascades,...
Abstract Aim To track the peopling of South Pacific and assess their impact on terrestrial aquatic ecosystems. Location Upolu, Samoa. Taxon Terrestrial plants Methods A sedimentary record covering last c . 10,500 years was recovered from volcanic crater that contains Lake Lanoto'o near centre Upolu Island. Information past ecological change obtained microscopic macroscopic remains extracted sediments: charcoal (fire history), pollen/spores plant (vegetation lake status (algae/cyanobacteria)....
ABSTRACT Nineteen new Icelandic tephra layers are identified in NGRIP and NEEM ice spanning Greenland Interstadial‐9 (GI‐9) the early phase of GI‐8 (∼38 000–40 500 b2k). Fourteen tephras record five direct correlatives NEEM, thus indicating occurrence 14 separate volcanic events. With two exceptions, tholeiitic basalt composition despite having very similar geochemical signatures can, most cases, be discriminated from one another using their TiO 2 values. All these fall within compositional...
Abstract. A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring annual layer counted Core Chronology 2005 (GICC05) from NGRIP to NEEM using 787 match points of mainly volcanic origin identified in Electrical Conductivity Measurement (ECM) and Dielectrical Profiling (DEP) records. Tephra horizons found both cores are used test matching based on ECM DEP provide additional time scale transfer. thinning function reflecting...
Tephrochronology is increasingly being recognised as a key tool for the correlation of disparate palaeoclimatic archives, underpinning chronological models and facilitating climatically independent comparisons climate proxies. Tephra frameworks integrating both distal proximal tephra occurrences are essential to these investigations providing information on their spatial distributions, geochemical signatures, eruptive sources well any available and/or stratigraphic information. Frameworks...
ABSTRACT Tephra preserved in sediments form useful isochronous marker layers, linking disparate geological, palaeoenvironmental and archaeological records. The application of tephrochronology is greatly enhanced through the detection macroscopically invisible tephra (cryptotephra). Here, we identify two discrete cryptotephra Samoan lake sediments, first identification region outside New Zealand. Geochemical data suggest one ash layer from a local source, providing on an eruption this age,...
Tephrochronology is increasingly being utilised as a key tool for improving chronological models and correlating disparate palaeoclimatic sequences. For many sedimentary environments, however, there an increased recognition that range of processes may impart delay in deposition and/or rework tephra. These can affect the integrity tephra deposits time-synchronous markers, therefore, it crucial to assess their isochronous nature, especially when cryptotephras are investigated dynamic marine...