A5029384789- Geology and Paleoclimatology Research
- Karst Systems and Hydrogeology
- Paleontology and Stratigraphy of Fossils
- Groundwater and Isotope Geochemistry
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Geological and Geochemical Analysis
- Landslides and related hazards
- Pleistocene-Era Hominins and Archaeology
- Geochemistry and Geologic Mapping
- Isotope Analysis in Ecology
- Marine and environmental studies
- Maritime and Coastal Archaeology
- Cryospheric studies and observations
- Geochemistry and Elemental Analysis
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Geological and Geophysical Studies Worldwide
- Geological and Geophysical Studies
- Archaeology and ancient environmental studies
- Archaeological and Geological Studies
- Climate change and permafrost
- Groundwater flow and contamination studies
- Subterranean biodiversity and taxonomy
- earthquake and tectonic studies
University of Birmingham
2014-2023
Australian National University
2021
Forest Research
2016
Environmental Earth Sciences
2013
Universidad Complutense de Madrid
2010
Institute of Geography of the Slovak Academy of Sciences
2010
Keele University
1996-2009
Louisiana State University
2009
Lancaster University
2009
Universität Innsbruck
2009
We review recent observations and models concerning the dynamics of Cryogenian global glaciation their biological consequences.
Abstract Stratigraphy provides insights into the evolution and dynamics of Earth System over its long history. With recent developments in science, changes can now be observed directly projected near future. An integration two approaches powerful nature significance contemporary to Earth. From both perspectives, has been pushed out Holocene Epoch by human activities, with mid‐20th century a strong candidate for start date Anthropocene, proposed new epoch Here we explore contrasting scenarios...
Abstract The increasing carbon dioxide (CO 2 ) concentration in the atmosphere combination with climatic changes throughout last century are likely to have had a profound effect on physiology of trees: altering and water fluxes passing through stomatal pores. However, magnitude spatial patterns such natural forests remain highly uncertain. Here, stable isotope ratios from network 35 tree‐ring sites located across Europe investigated determine intrinsic water‐use efficiency ( iWUE ), ratio...
Abstract The term Anthropocene initially emerged from the Earth System science community in early 2000s, denoting a concept that Holocene Epoch has terminated as consequence of human activities. First associated with onset Industrial Revolution, it was then more closely linked Great Acceleration industrialization and globalization 1950s fundamentally modified physical, chemical, biological signals geological archives. Since 2009, been evaluated by Working Group, tasked examining for...
Five fabrics were identified in Alpine and Irish caves on the basis of morphological microstructural characteristics, re- lated to growth mechanisms environment. Columnar fibrous grow when speleothems are continuously wet, from fluids at near-equilibrium conditions (low supersaturation; SIcc , 0.35), through screw dislocation mechanism. The highly defective microcrystalline form same supersaturation range as co- lumnar fabric but under variable discharge presence inhibitors. Dendritic...
Research Article| February 01, 1999 Widespread bacterial populations at glacier beds and their relationship to rock weathering carbon cycling Martin Sharp; Sharp 1Department of Earth Atmospheric Sciences, University Alberta, Edmonton, Alberta T6G 2E3, Canada Search for other works by this author on: GSW Google Scholar John Parkes; Parkes 2Department Geology, Bristol, Bristol BS8 1RJ, UK Barry Cragg; Cragg Ian J. Fairchild; Fairchild 3Department Keele University, Staffs ST5 5BG, Helen Lamb;...
ABSTRACT In Grotte de Clamouse (France), aragonite forms in a variety of crystal habits whose properties reflect the conditions formation. Prolonged degassing and evaporation yield needle aragonite, which is more enriched 18O 13C than ray crystals, form near isotopic equilibrium. At present, crystals at tops stalagmites very low discharge (0.00035 ml/ min), when fluid Mg/Ca ratio > 1.1. Temperature do not seem to have significant role their The presence should be indicative decrease drip...
The Neoproterozoic contains severe glacial intervals (750–580 Ma) including two extending to low palaeomagnetic latitudes. Paucity of radiometric dates indicates the need for chronostratigraphic tools. Whereas marine 87 Sr/ 86 Sr signatures show a steady rise, δ 13 C fluctuates, most reproducible variations being negative in carbonate caps units, but more diagenetic work is needed. Four conceptual models icehouse conditions are contrasted: Zipper-Rift Earth (diachronous glaciation related...
Abrupt first-order shifts in strontium and phosphorus concentrations stalagmite calcite deposited western Ireland during the 8200-year event (the major cooling episode 8200 years before present) are interpreted as responses to a drier climate lasting about 37 years. Both centered on 8330 ± 80 present, coinciding with large oxygen isotope anomaly change petrography. In this very high resolution (monthly) record, antipathetic second-order oscillations reveal decreased growth rates increased...
Chromium isotopes are fractionated during redox reactions and have the potential to provide a record of changes in oxygenation levels oceans geological past. However, Cr is trace metal seawater its low concentrations make isotopic measurements challenging. Here we report first determinations δCr53 for from open ocean (Argentine Basin) coastal (Southampton Water) settings, using double-spike technique. The total chromium concentration Southampton Water 1.85 nM, whereas content Argentine Basin...