A5072491741- Geology and Paleoclimatology Research
- Karst Systems and Hydrogeology
- Methane Hydrates and Related Phenomena
- Groundwater and Isotope Geochemistry
- Geological formations and processes
- Tree-ring climate responses
- Geological and Geophysical Studies Worldwide
- Pleistocene-Era Hominins and Archaeology
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Water Resources and Management
- Marine and environmental studies
- Neural Networks and Applications
- Forensic Anthropology and Bioarchaeology Studies
- Electron and X-Ray Spectroscopy Techniques
- Nuclear Physics and Applications
- Planetary Science and Exploration
- Flow Measurement and Analysis
- Aquatic and Environmental Studies
- Medical and Biological Sciences
- Species Distribution and Climate Change
- Marine Biology and Ecology Research
- Urban Heat Island Mitigation
- Scientific Research and Discoveries
- Plant Ecology and Soil Science
Planetary Science Institute
2017-2024
University of California, Berkeley
2021-2024
University of California, Davis
2017-2023
Boston College
2015-2017
Abstract Aims Some biogeographical regions act primarily as donors of colonists to other regions, while others predominantly recipient areas. How some biotas become dominant do not is a largely historical question that has received surprisingly little attention from biogeographers. Here, we seek answer this for the cold‐water North Pacific biota, which did exist forty million years ago but now principal donor biota outside tropics. Location We focus on cool‐temperate coastal Ocean over last...
The oxygen isotopic composition of stalagmites is widely used to infer regional changes in terrestrial surface temperatures and precipitation dynamics. stalagmite δ18O values, however, record the influence multiple environmental conditions (e.g., temperature, source amount) as well in-cave physicochemical processes possible disequilibrium effects. δ2H values fluids entombed inclusions have potential be robust proxies paleo-precipitation δ2H. Here we analyze inclusion-fluid for a from central...
Cave carbonates are an important archive of terrestrial paleoclimate and have previously been analyzed using multiple proxies. A few studies explored the potential for carbonate clumped isotope thermometry as a tool constraining past temperatures. To date, most papers utilizing this method focused on mass-47 values (Δ47) at single location reported that cave minerals rarely achieve isotopic equilibrium, with kinetic effects (KIEs) attributed to CO2 degassing. More recently, shown mass-48...
Abstract Application of novel proxies, such as the stable isotope compositions and noble gas concentrations fossil drip water trapped inclusions in stalagmites, have potential to provide unique constraints on past hydroclimate states surface temperatures. Geochemical analysis inclusion waters, however, requires an understanding three‐dimensional spatial distribution dominantly liquid‐ versus air‐filled a given stalagmite. Here we couple neutron computed tomography medium‐ high‐resolution...
In the southwestern United States, California (CA) is one of most climatically sensitive regions given its low (≤250 mm/year) seasonal precipitation and inherently variable hydroclimate, subject to large magnitude modulation. To reconstruct past climate change in CA, cave calcite deposits (stalagmites) have been utilized as an archive for environmentally proxies, such stable isotope compositions (δ 18 O, δ 13 C) trace element concentrations (e.g., Mg, Ba, Sr). Monitoring associated surface...
Clumped-isotope (Δ47) measurements from speleothem calcite have the potential to record formation temperatures with an uncertainty of ± 2°C but are strongly impacted by kinetic effects during mineral precipitation that lead isotopic disequilibrium and erroneously high-temperature estimates. The application dual clumped-isotope (Δ47-Δ48) can identify influence has provide temperature estimates corrected for degree disequilibrium, though this...