A5103267775- Geology and Paleoclimatology Research
- Pleistocene-Era Hominins and Archaeology
- Archaeology and ancient environmental studies
- Geological formations and processes
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Cryospheric studies and observations
- Geochemistry and Geologic Mapping
- Coastal wetland ecosystem dynamics
- Maritime and Coastal Archaeology
- Atmospheric chemistry and aerosols
- Forensic Anthropology and Bioarchaeology Studies
- Hydrocarbon exploration and reservoir analysis
- Global Energy and Sustainability Research
- Climate Change, Adaptation, Migration
- Pacific and Southeast Asian Studies
- Virus-based gene therapy research
- Mineralogy and Gemology Studies
- Climate variability and models
- Aeolian processes and effects
- Methane Hydrates and Related Phenomena
- Scientific Research and Discoveries
- Folklore, Mythology, and Literature Studies
- Atmospheric aerosols and clouds
University of Reading
2018-2022
Royal Holloway University of London
2010-2020
University of London
2013
The Lower to Middle Paleolithic transition (~400,000 200,000 years ago) is marked by technical, behavioral, and anatomical changes among hominin populations throughout Africa Eurasia. replacement of bifacial stone tools, such as handaxes, tools made on flakes detached from Levallois cores documents the most important conceptual shift in tool production strategies since advent technology more than one million earlier has been argued result expansion archaic Homo sapiens out Africa. Our data...
Marked changes in human dispersal and development during the Middle to Upper Paleolithic transition have been attributed massive volcanic eruption and/or severe climatic deterioration. We test this concept using records of ash layers Campanian Ignimbrite dated ca. 40,000 y ago (40 ka B.P.). The distribution has enhanced by discovery cryptotephra deposits (volcanic that are not visible naked eye) archaeological cave sequences. They enable us synchronize paleoclimatic through period from...
The 2010 Eyjafjallajökull lasted 39 days and had 4 different phases, of which the first third (14–18 April 5–6 May) were most intense. Most this period was dominated by winds with a northerly component that carried tephra toward Europe, where it deposited in number locations sampled rain gauges or buckets, surface swabs, sticky‐tape samples air filtering. In UK, collected from each Phases 1–3 combined range latitudes spanning length country. modal grain size gauge 25 μ m, but largest grains...
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 This paper presents the results of micromorphological analysis laminated sediments that accumulated in ice‐dammed lakes Lochaber (Glen Roy and vicinity) during Younger Dryas (Loch Lomond) Stadial. These were responsible for formation famous ‘Parallel Roads Glen Roy’ (Agassiz, 1840 ), prominent shorelines cut into valley sides adjacent valleys. Annually deposited (varved) layers, which can be distinguished from other rhythmites by examination, have enabled construction a varve...
The varved sediment of Lake Suigetsu (central J apan) provides a valuable opportunity to obtain high‐resolution, multi‐proxy palaeoenvironmental data across the last glacial/interglacial cycle. In order maximize potential this archive, well‐constrained chronology is required. This paper outlines multiple geochronological techniques being applied – namely varve counting, radiocarbon dating, tephrochronology (including argon–argon dating) and optically stimulated luminescence ( OSL )...
Mapping the transport and deposition of tephra is important for assessment an eruption's impact on health, transport, vegetation infrastructure, but it challenging at large distances from a volcano (> 1000 km), where may not be visible to naked eye. Here we describe range methods used quantify air quality during 21–28 May 2011 explosive basaltic eruption Grímsvötn volcano, Iceland. Tephra was detected in UK with tape-on-paper samples, rainwater chemistry analysis, pollen slides measurements....
Former glaciolacustrine systems are an important archive of palaeoglaciological, palaeoenvironmental and palaeoclimatic change. The annually laminated (varved) sediments that, under certain conditions, accumulate in former glacial lakes, offer a rare opportunity to reconstruct such changes (e.g. glacier advance retreat cycles, ablation trends, permafrost melt, nival events) at annual or even sub-annual temporal resolution. Data this kind desirable for their ability guide test numerical model...
We present a revised varve chronology for the duration of ice-dammed lakes that formed in Lochaber district, Scotland, during Loch Lomond ('Younger Dryas') Stadial. analysed new varved sequences and combined them with existing records to develop Master Varve Chronology 2019 (LMVC19), published here first time. It spans an interval 518 ± 18 vyrs is considered more secure than its predecessors because: (i) it anchored by robust record Vedde Ash, which dated 12,043 43 cal yr BP; (ii) provides...
Glacial varves can give significant insights into recession and melting rates of decaying ice sheets. Moreover, varve chronologies provide an independent means comparison to other annually resolved climatic archives, which ultimately help assess the timing response sheet changes across rapid climate transitions. Here we report a composite 1257‐year‐long chronology from southeastern Sweden spanning regional late Allerød–late Younger Dryas pollen zone. The was correlated Greenland Ice‐Core...
ABSTRACT Here we present a 710‐year‐long floating varve record from south‐east Sweden. Tephra analyses confirm the presence of rhyolitic Vedde Ash preserved within two consecutive years, confirming Younger Dryas age series. This permits, for first time, direct correlation Swedish varved clay with other records equivalent resolution which also preserve and demonstrates that potential exists to independently date Timescale. discovery will allow comparison rates, timing duration key climatic...
Abstract Volcanoes in the East Asian/Pacific region have been source of some largest magnitude eruptions during Late Quaternary, and accurately evaluating their eruptive histories is essential for hazard assessments. To overcome difficulties resolving precisely dating near‐source realm, high‐resolution (varved) sediments Lake Suigetsu (central Honshu, Japan) were examined presence non‐visible (cryptotephra) layers from 50 ka up until 30 Aira‐Tanzawa (AT) caldera‐forming event Aira volcano....