A5052547746- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Paleontology and Stratigraphy of Fossils
- Atmospheric and Environmental Gas Dynamics
- Geological Studies and Exploration
- Isotope Analysis in Ecology
- Groundwater and Isotope Geochemistry
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies
- Climate change and permafrost
- Marine and coastal ecosystems
- Carbon Dioxide Capture Technologies
- Archaeology and ancient environmental studies
- Maritime Transport Emissions and Efficiency
- CO2 Sequestration and Geologic Interactions
- Catalytic Processes in Materials Science
- Radioactive element chemistry and processing
- Groundwater flow and contamination studies
- Heavy metals in environment
- Biocrusts and Microbial Ecology
- Calcium Carbonate Crystallization and Inhibition
- Marine Biology and Ecology Research
- Climate variability and models
- Peatlands and Wetlands Ecology
University of California System
2023
University of California, Riverside
2012-2022
Central Michigan University
2018-2022
University of Bristol
2015-2018
Jet Propulsion Laboratory
2008
California Institute of Technology
2008
The Paleocene-Eocene Thermal Maximum (PETM) hyperthermal, ~ 56 million years ago (Ma), is the most dramatic example of abrupt Cenozoic global warming. During PETM surface temperatures increased between 5 and 9 °C onset likely took < 20 kyr. provides a case study impacts rapid warming on Earth system, including both hydrological associated biogeochemical feedbacks, proxy data from can provide constraints changes in warm climate hydrology simulated by general circulation models (GCMs). In this...
Research Article| February 01, 2013 Lipid biomarkers record fundamental changes in the microbial community structure of tropical seas during Late Ordovician Hirnantian glaciation Megan Rohrssen; Rohrssen * 1Department Earth Sciences, University California–Riverside, Riverside, California 92521, USA *E-mails: mrohr001@ucr.edu; glove@ucr.edu. Search for other works by this author on: GSW Google Scholar Gordon D. Love; Love Woodward Fischer; Fischer 2Department Geological and Planetary...
Abstract By about 2.0 billion years ago (Ga), there is evidence for a period best known its extended, apparent geochemical stability expressed famously in the carbonate–carbon isotope data. Despite first appearance and early innovation among eukaryotic organisms, this also rarity of fossils an absence organic biomarker fingerprints those suggesting low diversity relatively small populations compared to Neoproterozoic era. Nevertheless, search diagnostic biomarkers has not been performed with...
The permafrost on the North Slope of Alaska is densely populated by shallow lakes that result from thermokarst erosion. These release methane (CH4 ) derived a combination ancient thermogenic pools and contemporary biogenic production. Despite potential importance CH4 as greenhouse gas, contribution production in arctic not currently well understood. To further advance our knowledge dynamics these lakes, we focused study (i) for microbial lake sediments, (ii) role sediment geochemistry...
Abstract Terrestrial methane (CH4) emissions may have increased during the Paleocene-Eocene Thermal Maximum (PETM; ca. 56 Ma) and promoted additional warming, especially in high latitudes. Although there is evidence for CH4 cycling a single Northern Hemisphere site, whether enhanced was globally widespread unknown because been no subsequent investigations. The mechanism of release also direct comparison between temperature has so far not possible. Here we use biomarkers to reconstruct change...
The early Eocene (56.0 to 47.8 million years ago) was punctuated by a series of transient episodes rapid global warming superimposed on the long-term Cenozoic trend, culminating in Climatic Optimum (EECO; 53.3 49.1 ago). Details hydroclimate regime operating during EECO are poorly constrained, especially for continental interior sites. Green River Formation (GRF) Utah and Colorado deposited suite large, unusually productive lakes that offer an ideal opportunity study hydrological response...
The isotopic composition of water in hydrated minerals, such as gypsum and jarosite, has numerous applications studies recent climate change, ore formation, soil development. However, oxygen hydrogen isotope analysis crystallization is currently a complex procedure. Commonly used techniques involve offline extraction from minerals subsequent analysis. Such methods are time-consuming, require relatively large sample sizes, the stepwise procedure to be carried out with extreme caution avoid...
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