A5000940578- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Hydrocarbon exploration and reservoir analysis
- Isotope Analysis in Ecology
- Metabolomics and Mass Spectrometry Studies
- Climate change and permafrost
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Mass Spectrometry Techniques and Applications
- Marine and environmental studies
- Algal biology and biofuel production
- Marine Bivalve and Aquaculture Studies
- Polar Research and Ecology
- Marine and fisheries research
- Food Industry and Aquatic Biology
- Pleistocene-Era Hominins and Archaeology
- Analytical Chemistry and Chromatography
- Physiological and biochemical adaptations
- Diatoms and Algae Research
- Freezing and Crystallization Processes
- Paleontology and Stratigraphy of Fossils
- Lipid metabolism and biosynthesis
- Aquaculture Nutrition and Growth
University of Plymouth
2015-2024
University of Exeter
2024
Korea Polar Research Institute
2017
Hanyang University
2017
Abstract The presence of a di-unsaturated highly branched isoprenoid (HBI) lipid biomarker (diene II) in Southern Ocean sediments has previously been proposed as proxy measure palaeo Antarctic sea ice. Here we show that source diene II is the sympagic diatom Berkeleya adeliensis Medlin. Furthermore, propensity for B. to flourish platelet ice reflected by an offshore downward gradient concentration >100 surface from coastal and near-coastal environments. Since formation strongly associated...
Abstract The Southern Ocean paleoceanography provides key insights into how iron fertilization and oceanic productivity developed through Pleistocene ice-ages their role in influencing the carbon cycle. We report a high-resolution record of dust deposition ocean for Antarctic Zone, close to main source, Patagonia. Our deep-ocean records cover last 1.5 Ma, thus doubling that from ice-cores. find 5 15-fold increase during glacials 2 5-fold biogenic silica deposition, reflecting higher...
The spring phytoplankton bloom is a characteristic feature of mid-high latitudes in modern times, but can be challenging to identify palaeo records. In the current study, we investigated absolute and relative distributions two diatom-derived tri-unsaturated highly branched isoprenoid (HBI) lipids, at least one which has previously been suggested possible proxy for productive region marginal ice zone (MIZ) Polar Regions. Based on comparison their surface sediments from Barents Sea...
Sea ice and associated feedback mechanisms play an important role for both long- short-term climate change. Our ability to predict future sea extent, however, hinges on a greater understanding of past dynamics. Here we investigate changes in the eastern Bering prior to, across, after Mid-Pleistocene transition (MPT). The record, based Arctic biomarker IP25 related open water proxies from International Ocean Discovery Program Site U1343, shows substantial increase extent across MPT....
Abstract The variability of Arctic sea-ice during abrupt stadial-interstadial shifts in the last glacial period remain poorly understood. Here, we investigated millennial-scale relationship, with a focus on Heinrich Stadials (HS), between cover and bottom water temperature (BWT) Marine Isotope Stages (MIS) 3 2 (64–13 ka) Fram Strait using new molecular sea ice biomarker data published benthic foraminiferal BWT records. Widespread spring (SpSIC) dominated studied interval, especially mid-late...
We investigated diets of 24 Barents Sea zooplankton taxa to understand pelagic food-web processes during late summer, including the importance sea ice algae-produced carbon. This was achieved by combining insights derived from multiple and complementary trophic marker approaches construct individual aspects feeding. Specifically, we determined proportions algal-produced fatty acids (FAs) reflect reliance on diatom- versus dinoflagellate-derived carbon, highly branched isoprenoid (HBI) lipids...
In recent years, certain mono- and di-unsaturated highly branched isoprenoid (HBI) alkene biomarkers (i.e., IP25 HBI IIa) have emerged as useful proxies for sea ice in the Arctic Antarctic, respectively. Despite relatively large number of reconstructions based on IIa, considerably fewer studies addressed variability or underlying water column during a spring bloom melt season. this study, we quantified various other HBIs at high temporal vertical resolution (suspended sinking particulate...
Abstract The cryospheric response to climatic warming responsible for recent Arctic sea ice decline can be elucidated using marine geological archives which offer an important long-term perspective. Holocene Thermal Maximum, between 10 and 6 thousand years ago, provides opportunity investigate during a warmer-than-present interval. Here we use organic biomarkers benthic foraminiferal stable isotope data from two sediment cores in the northernmost Barents Sea (>80 °N) reconstruct seasonal...
The Barents Sea is a hotspot for environmental change due to its rapid warming, and information on dietary preferences of zooplankton crucial better understand the impacts these changes food-web dynamics. We combined lipid-based trophic marker approaches, namely analysis fatty acids (FAs), highly branched isoprenoids (HBIs) sterols, compare late summer (August) early winter (November/December) feeding key zooplankters; copepods Calanus glacialis , C. hyperboreus finmarchicus amphipods...
Microalgae growing within and attached to the bottom of Arctic sea ice (sympagic algae) can serve as a nutritious food resource for animals inhabiting sea-ice water interface (under-ice fauna), particularly during ice-algal bloom in spring. As consequence, under-ice fauna is likely impacted by decline changes primary production. To investigate this, samples pelagic (=PPOM) ice-associated particulate organic matter (=IPOM) amphipods Apherusa glacialis Eusirus holmii, polar cod (Boreogadus...