A5077382592- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Marine and environmental studies
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Marine Biology and Ecology Research
- Coral and Marine Ecosystems Studies
- Geological formations and processes
- Geochemistry and Geologic Mapping
- scientometrics and bibliometrics research
- Marine and coastal ecosystems
- Geochemistry and Elemental Analysis
- Fire effects on ecosystems
- Fish Biology and Ecology Studies
- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Adipose Tissue and Metabolism
- Pacific and Southeast Asian Studies
- Ecosystem dynamics and resilience
- Identification and Quantification in Food
- Global Health and Surgery
- Oceanographic and Atmospheric Processes
- Cryospheric studies and observations
The Open University
2015-2024
Durham University
2024
Institut Pierre-Gilles de Gennes pour la Microfluidique
2024
Hong Kong Metropolitan University
2024
Universidade Aberta
2021
Rama University
2018-2020
Rama Hospital & Research Centre
2019-2020
Ecosystem Sciences
2019
International Ocean Discovery Program
2016
University of Amsterdam
2008
Paired Mg/Ca and δ 18 O measurements on planktonic foraminiferal species ( G. ruber white, pink, sacculifer , conglobatus aequilateralis O. universa N. dutertrei P. obliquiloculata inflata truncatulinoides hirsuta crassaformis ) from a 6‐year sediment trap time series in the Sargasso Sea were used to define sensitivity of calcification temperature. Habitat depths temperatures estimated comparison foraminifera with equilibrium calcite, based historical temperature salinity data. When...
Abstract The Pliocene Epoch (∼5.3–2.6 million years ago, Ma) was characterized by a warmer than present climate with smaller Northern Hemisphere ice sheets, and offers an example of system in long‐term equilibrium current or predicted near‐future atmospheric CO 2 concentrations ( p ). A trend ice‐sheet expansion led to more pronounced glacial (cold) stages the end (∼2.6 Ma), known as “intensification Glaciation” (iNHG). We assessed spatial temporal variability ocean temperatures ice‐volume...
Reliable temperature estimates from both surface and subsurface ocean waters are needed to reconstruct past upper water column gradients oceanic heat content. This work examines the relationships between trace element ratios in fossil shells seawater for surface‐dwelling foraminifera species, Globigerinoides ruber (white) Globigerina bulloides , deep‐dwelling Globorotalia inflata truncatulinoides (dextral sinistral) Pulleniatina obliquiloculata . Mg/Ca Sr/Ca picked 29 modern core tops North...
Pleistocene and future South Asian monsoon rainfall are linked to greenhouse gases, ice volume, southern hemisphere moisture.
Two sediment cores from the western (905; 10.46°9′N, 51.56°4′E, water depth 1586 m) and eastern (SK17; 15°15′N, 72°58′E, 840 Arabian Sea were used to study past sea surface temperatures (SST) seawater δ 18 O ( Ow) variations for 35 ka. We coupled Mg/Ca‐ calcite variability in two planktonic foraminiferal species: Globigerinoides ruber , which thrives throughout year, Globigerina bulloides occurs mainly when waters contain high nutrients during upwelling or convective mixing. SSTs both areas...
Asian Monsoon rainfall supports the livelihood of billions people, yet relative importance different drivers remains an issue great debate. Here, we present 30 million-year model-based reconstructions Indian summer monsoon and South East at millennial resolution. We show that precession is dominant direct driver orbital variability, although variability on obliquity timescales driven through ice sheets. Orographic development dominated evolution monsoon, but involved a complex mix...
Abstract. The oxygen isotopic composition of planktonic foraminifera tests is one the widest used geochemical tools to reconstruct past changes physical parameters upper ocean. It common practice analyze multiple individuals from a mono-specific population and assume that outcome reflects mean value environmental conditions during calcification analyzed individuals. Here we present isotope individual specimens surface-dwelling species Globigerinoides ruber Globigerina bulloides sediment...
Abstract X‐ray fluorescence (XRF) core scanning of marine and lake sediments has been extensively used to study changes in past environmental climatic processes over a range timescales. The interpretation XRF‐derived element ratios paleoclimatic paleoceanographic studies primarily considers differences the relative abundances particular elements. Here we present new XRF data from two long sediment cores Andaman Sea northern Indian Ocean show that sea level related influence terrigenous...
Geology is the science of how Earth functions and has evolved and, as such, it can contribute to our understanding climate system responds addition carbon dioxide (CO 2 ) atmosphere oceans.Observations from geological record show that atmospheric CO concentrations are now at their highest levels in least past 3 million years.Furthermore, current speed human-induced change warming nearly without precedent entire record, with only known exception being instantaneous, meteorite-induced event...
The variability in Mg/Ca and Sr/Ca within individual tests chambers of tests, samples consisting differing numbers individuals, was determined for Globigerina bulloides Globorotalia truncatulinoides a North Atlantic core top sample (52.918°N 16.917°W′). by electron microprobe, variable size were measured using inductively coupled plasma optical emission spectrometer (ICP‐OES). Large compositional heterogeneity found chambers, the test as whole, two species presence regions with up to ∼10...
Abstract. Oligotrophic regions represent up to 75% of Earth's open-ocean environments. They are thus areas major importance in understanding the plankton community dynamics and biogeochemical fluxes. Here we present fluxes total planktonic foraminifera 11 foraminifer species measured at Oceanic Flux Program (OFP) time series site oligotrophic Sargasso Sea, subtropical western North Atlantic Ocean. Foraminifera flux was 1500 m water depth, over two ~ 2.5-year intervals: 1998–2000 2007–2010....
Geochemistry provides useful research tools related to fundamental processes in Earth, Environmental and Planetary Sciences. It has a distinct identity among the academic communities these subjects, yet there is no specific data on workforce diversity geochemists. We present first demographic of UK geochemists from voluntary anonymous survey. scrutinise with respect protected characteristics (e.g., age, ethnicity, gender identity, sexual orientation disability) seniority those within...
Planktonic foraminifera record oceanic conditions in their shell geochemistry. Many palaeoenvironmental studies have used fossil planktonic to constrain past seawater properties by defining species based on morphology. Recent genetic studies, however, identified ecologically distinct genotypes within traditionally recognized morphospecies, signaling potential repercussions for palaeoclimate reconstructions. Here we demonstrate how the presence of Globigerina bulloides cryptic Arabian Sea may...
Although boron and uranium to calcium ratios (B/Ca, U/Ca) in planktonic foraminifera have recently received much attention as potential proxies for ocean carbonate chemistry, the extent of a chemistry control on these remains contentious. Here, we use bi-weekly sediment trap samples collected from subtropical North Atlantic combination with measured oceanographic data same location evaluate dominant controls B/Ca U/Ca three depth-stratified species foraminifera. We also test biological,...