Vincent Hare
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View article: Extreme triple oxygen isotope fractionation in <i>Equisetum</i>
Extreme triple oxygen isotope fractionation in <i>Equisetum</i> Open
Triple oxygen isotope values of xylem water were measured along the length of smooth horsetail stems ( Equisetum laevigatum ). Extreme isotope enrichment is observed moving from base to stem tip. δ 18 O values range from −8.3‰ at the base …
View article: Determining rainfall seasonality from high-resolution carbon isotope profiles in evergreen wood and charcoal
Determining rainfall seasonality from high-resolution carbon isotope profiles in evergreen wood and charcoal Open
Rainfall seasonality is a critical parameter in palaeoclimate reconstructions, both for improving climate models, and understanding past human-environment relationships. One promising approach is to infer rainfall seasonality from sub-annu…
View article: Triple oxygen isotopes in eggshell carbonate as a proxy of late Cenozoic CO2 and primary productivity
Triple oxygen isotopes in eggshell carbonate as a proxy of late Cenozoic CO2 and primary productivity Open
(IF 5;Q1)
View article: High-Precision Triple Oxgyen Isotope Analysis of CO<sub>2 </sub>by TILDAS
High-Precision Triple Oxgyen Isotope Analysis of CO<sub>2 </sub>by TILDAS Open
View article: High-Precision Triple Oxygen Isotope Analysis of Carbon Dioxide by Tunable Infrared Laser Absorption Spectroscopy
High-Precision Triple Oxygen Isotope Analysis of Carbon Dioxide by Tunable Infrared Laser Absorption Spectroscopy Open
Precision measurements of the stable isotope ratios of oxygen (18O/16O, 17O/16O) in CO2 are critical to atmospheric monitoring and terrestrial climate research. High-precision 17O measurements by isotope ratio mass spectrometry (IRMS) are …
View article: Fossil charcoals as a means for reconstruction of past hydroclimate variability through the Last Glacial Maximum: a case study from two archaeological sites in the Winter and Year-round Rainfall Zones, South Africa
Fossil charcoals as a means for reconstruction of past hydroclimate variability through the Last Glacial Maximum: a case study from two archaeological sites in the Winter and Year-round Rainfall Zones, South Africa Open
<p>The hydrology of the Last Glacial Maximum (LGM) in South Africa has been an active area of research over the last six decades due to the richness of many proxy records and the high preservation potential of deposits of this age at…
View article: Peer Review #1 of "C3 plant isotopic variability in a boreal mixed woodland: implications for bison and other herbivores (v0.1)"
Peer Review #1 of "C3 plant isotopic variability in a boreal mixed woodland: implications for bison and other herbivores (v0.1)" Open
Plant isotopic baselines are critical for accurately reconstructing ancient diets and environments and for using stable isotopes to monitor ecosystem conservation.This study examines the stable carbon and nitrogen isotope compositions (δ 1…
View article: Effect of Southern Hemisphere Westerlies on hydroclimate and seasonality from the Last Glacial Maximum: Using the fossil charcoal and pollen records from Elands Bay Cave and Boomplaas Cave, South Africa
Effect of Southern Hemisphere Westerlies on hydroclimate and seasonality from the Last Glacial Maximum: Using the fossil charcoal and pollen records from Elands Bay Cave and Boomplaas Cave, South Africa Open
<p>Palaeoproxy records during the Last Glacial Maximum (LGM) in Southern Africa have not offered consistent results regarding hydroclimate of the region. Similarly, models from the Palaeoclimate/Coupled Modelling Intercomparison Proj…
View article: Searching for the fundamentals of rehydroxylation dating of archaeological ceramics via NMR and IR microscopy
Searching for the fundamentals of rehydroxylation dating of archaeological ceramics via NMR and IR microscopy Open
Determining absolute ages of archaeological ceramics is crucial for understanding past societies and reconstructing their accurate chronologies. The amount of OH hydroxyl chemically combined with ceramic material has been claimed to provid…
View article: Differences in carbon isotope fractionation between angiosperm and gymnosperm woody plants, and their significance for paleoatmosphere and hydroclimate reconstruction.
Differences in carbon isotope fractionation between angiosperm and gymnosperm woody plants, and their significance for paleoatmosphere and hydroclimate reconstruction. Open
In terrestrial contexts, the stable carbon isotopic composition of fossil C 3 plant matter is widely used as a proxy of past hydroclimate and atmospheric CO 2 concentration.Presently, differences in carbon isotope discrimination (Δ 13 C) b…
View article: Differences in carbon isotope discrimination between angiosperm and gymnosperm woody plants, and their geological significance
Differences in carbon isotope discrimination between angiosperm and gymnosperm woody plants, and their geological significance Open
For most of the Phanerozoic Eon, Earth’s woody vegetation has been dominated by C3 plants – predominantly gymnosperms - with angiosperms only emerging as the dominant plant group as CO2 declined during the Cenozoic (66 Ma onward). At prese…
View article: Impacts of soil water stress on the acclimated stomatal limitation of photosynthesis: Insights from stable carbon isotope data
Impacts of soil water stress on the acclimated stomatal limitation of photosynthesis: Insights from stable carbon isotope data Open
Atmospheric aridity and drought both influence physiological function in plant leaves, but their relative contributions to changes in the ratio of leaf internal to ambient partial pressure of CO 2 ( χ ) – an index of adjustments in both st…
View article: Upholding "good science" in human origins research: A response to Chan et al (2019)
Upholding "good science" in human origins research: A response to Chan et al (2019) Open
The recent publication by Chan et al (2019) entitled “Human origins in a southern African palaeo-wetland and first migrations” fails to meet scientific standards for publication in two ways. First, it neglects its scientific duty to discus…
View article: Climate and ecology of the palaeo-Agulhas Plain from stable carbon and oxygen isotopes in bovid tooth enamel from Nelson Bay Cave, South Africa
Climate and ecology of the palaeo-Agulhas Plain from stable carbon and oxygen isotopes in bovid tooth enamel from Nelson Bay Cave, South Africa Open
We measured δ13Cenamel and δ18Oenamel in 213 archaeological bovid teeth from Nelson Bay Cave (NBC), spanning the last 22 ka. We also recorded dental mesowear (occlusal relief [high versus low] and cusp shape [sharp, round, or blunt]) of al…
View article: Reconciling the Greenland ice-core and radiocarbon timescales through the Laschamp geomagnetic excursion
Reconciling the Greenland ice-core and radiocarbon timescales through the Laschamp geomagnetic excursion Open
View article: New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425–1550 CE) and Implications for the South Atlantic Anomaly
New Archeomagnetic Directional Records From Iron Age Southern Africa (ca. 425–1550 CE) and Implications for the South Atlantic Anomaly Open
The paucity of Southern Hemisphere archeomagnetic data limits the resolution of paleosecular variation models. At the same time, important changes in the modern and historical field, including the recent dipole decay, appear to originate i…
View article: Atmospheric CO2 effect on stable carbon isotope composition of terrestrial fossil archives
Atmospheric CO2 effect on stable carbon isotope composition of terrestrial fossil archives Open
View article: The relationship of ungulate δ13C and environment in the temperate biome of southern Africa, and its palaeoclimatic application
The relationship of ungulate δ13C and environment in the temperate biome of southern Africa, and its palaeoclimatic application Open
Supporting dataset for "The relationship of ungulate d13C and environment in the temperate biome of Southern Africa, and its palaeoclimatic application" Paleoclimatology, Paleoecology, Paleogeography Vol 514, pp. 282-2…
View article: Testing the (time)1/4 diffusion law of rehydroxylation in firedclays: evidence for single-file diffusion in porous media?
Testing the (time)1/4 diffusion law of rehydroxylation in firedclays: evidence for single-file diffusion in porous media? Open
Fired clay minerals rehydroxylate after firing, a phenomenon that causes the long-term mass gain and expansion seen in archaeological ceramics. During rehydroxylation, fired clay minerals react with H2O to form structural hydroxyl (OH). Re…
View article: Theoretical constraints on the precision and age range of rehydroxylation dating
Theoretical constraints on the precision and age range of rehydroxylation dating Open
Accurate and precise dating methods are of central importance to archaeology, palaeontology and earth science. This paper investigates the expected precision and age range of rehydroxylation dating, a recently proposed technique for fired …