A5072849606- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Coral and Marine Ecosystems Studies
- Paleontology and Stratigraphy of Fossils
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Ocean Acidification Effects and Responses
- Marine and fisheries research
- Groundwater and Isotope Geochemistry
- Marine Biology and Ecology Research
- Marine Bivalve and Aquaculture Studies
- Cerebrospinal fluid and hydrocephalus
University of Southampton
2018-2023
National Oceanography Centre
2018-2023
Ollscoil na Gaillimhe – University of Galway
2023
UiT The Arctic University of Norway
2022
University of Bremen
2022
Centre National de la Recherche Scientifique
2013-2022
Laboratoire d'Ecogéochimie des Environnements Benthiques
2013
Sorbonne Université
2013
Abstract The Piacenzian stage of the Pliocene (2.6 to 3.6 Ma) is most recent past interval sustained global warmth with mean temperatures markedly higher (by ~2–3 °C) than today. Quantifying CO 2 levels during mid-Piacenzian Warm Period (mPWP) provides a means, therefore, deepen our understanding Earth System behaviour in warm climate state. Here we present new high-resolution record atmospheric using δ 11 B-pH proxy from 3.35 3.15 million years ago (Ma) at temporal resolution 1 sample per...
The geological record encodes the relationship between climate and atmospheric carbon dioxide (CO 2 ) over long short timescales, as well potential drivers of evolutionary transitions. However, reconstructing CO beyond direct measurements requires use paleoproxies herein lies challenge, proxies differ in their assumptions, degree understanding, even reconstructed values. In this study, we critically evaluated, categorized, integrated available to create a high-fidelity transparently...
Observation-based reconstructions of Arctic sea surface temperatures in response to changing climate boundary conditions are critical constrain sensitivity and evaluate the uncertainties model simulations. On long pre-instrumental timescales, this is only possible by employing proxies. Yet, most proxies essential variables, such as (SST), suffer from limitations when applied cold that characterize environments. These prevent us constraining for some sensitive tipping points can trigger rapid...
Abstract Coral reefs are important ecosystems that increasingly negatively impacted by human activities. Understanding which anthropogenic stressors play the most significant role in their decline is vital for accurate prediction of future trends coral reef health and effective mitigation these threats. Here we present annually resolved boron carbon isotope measurements two cores capturing past 90 years growth tropical reef‐building Siderastrea siderea from Belize Mesoamerican Barrier Reef...
<p>The Piacenzian stage of the Pliocene (2.6 to 3.6 Ma) is most recent past interval sustained global warmth with mean temperatures markedly higher (by ~2-3 <sup>o</sup>C) than today. Quantifying CO<sub>2</sub> levels during mid-Piacenzian Warm Period (mPWP) provides a means, therefore, deepen our understanding Earth System behaviour in warm climate state. Here we present new high-resolution record atmospheric using...
Abstract Coral resilience to ocean acidification is largely determined by the degree of physiological control corals can exert on their calcifying fluid carbonate chemistry. In this study, boron isotopic composition (δ 11 B) a Porites colony growing reef flat Kiritimati Island in equatorial central Pacific examined quantify sensitivity pH (pH cf ) ambient environmental conditions. Skeletal δ B along growth axis one annual band was with bulk analysis and laser ablation (LA) MC‐ICP‐MS....
Rationale To detect the small changes in past pH , boron isotope ratio of coral carbonates, expressed as δ 11 B value, needs to be both precise and accurate (2sd <<1‰). Boron measurements by Multi‐Collector Inductively Coupled Plasma Mass Spectrometry (MC‐ICPMS) require carefully purified before analysis, which is time consuming, requires specialist training. Here, we use prepFAST‐MC method that enables automatic extraction (up 25 ng load) from a CaCO 3 matrix. Methods Samples were...
Abstract. Boron isotopes in planktonic foraminifera are a widely used proxy to determine ancient surface seawater pH and by extension atmospheric CO2 concentration climate forcing on geological timescales. Yet, reconstruct absolute values for CO2, we require δ11Bforam-borate calibration independent determinations of ocean temperature, salinity, second carbonate parameter, the boron isotope composition seawater. Although δ11B-derived records have been shown perform well against ice-core-based...
From the morning of June 23rd to 30th 2022, Department Geosciences at UiT Arctic University Norway, arranged a scientific cruise on R/V “Helmer Hanssen aimed sampling living planktic foraminifera (Neogloboquadrina pachyderma and Globigerina bulloides) for culturing experiments both onboard continued laboratory Department. The purpose is investigate physiological calcification responses this species wide range temperature, salinity carbonate chemistry as well establish Arctic-tailored proxy...
Abstract The original version of this Article contained errors.
Abstract. Boron isotopes in planktonic foraminifera are a widely used proxy to determine ancient surface seawater pH, and by extension atmospheric CO2 concentration climate forcing on geological time scales. Yet, reconstruct absolute values for pH CO2, we require δ11Bforam-borate calibration independent determinations of ocean temperature, salinity, second carbonate parameter, the boron isotope composition seawater. Although δ11B-derived records have been shown perform well against ice...