A5043459145- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Paleontology and Stratigraphy of Fossils
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Marine and environmental studies
- NMR spectroscopy and applications
- Plant Diversity and Evolution
- Geological formations and processes
- Groundwater and Isotope Geochemistry
- Atmospheric and Environmental Gas Dynamics
- Plant responses to elevated CO2
- Evolution and Paleontology Studies
- Chemical Synthesis and Characterization
- Methane Hydrates and Related Phenomena
- Radioactive contamination and transfer
- Cultural Heritage Materials Analysis
- Cassava research and cyanide
- Nuclear and radioactivity studies
- Mass Spectrometry Techniques and Applications
- Ecology and biodiversity studies
- Geophysical and Geoelectrical Methods
- Plant Ecology and Soil Science
- Petroleum Processing and Analysis
Pennsylvania State University
2018-2025
Utrecht University
2023
Northwestern University
2012-2016
Organic matter in meteorites reveals clues about early Solar System chemistry and the origin of molecules important to life, but terrestrial exposure complicates interpretation. Samples returned from B-type asteroid Bennu by Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer mission enabled us study pristine carbonaceous astromaterial without uncontrolled Earth's biosphere. Here we show that samples are volatile rich, with more carbon, nitrogen ammonia than...
Abstract The Paleocene‐Eocene Thermal Maximum (PETM) was a transient global warming event and is recognized in the geologic record by prolonged negative carbon isotope excursion (CIE). onset of CIE due to rapid influx 13 C‐depleted into ocean‐atmosphere system. However, mechanisms required sustain remains unclear. Enhanced mobilization oxidation petrogenic organic (OC petro ) has been invoked explain elevated atmospheric dioxide concentrations after CIE. existing evidence limited...
The Paleocene‐Eocene Thermal Maximum (PETM) is marked by a prominent negative carbon isotope excursion (CIE) of 3–5‰ that has characteristic rapid onset, stable body, and recovery to near pre‐CIE isotopic composition. Although the CIE major criterion for global correlation boundary, spatial variations in position shape have not been systematically evaluated. We measured ratios bulk organic matter ( δ 13 C org ) pedogenic carbonate carb at six PETM sections across 16 km transect SE Bighorn...
Research Article| September 01, 2016 Distortion of carbon isotope excursion in bulk soil organic matter during the Paleocene-Eocene thermal maximum Allison A. Baczynski; Baczynski 1Department Earth and Planetary Sciences, Northwestern University, Evanston, Illinois 60208, USA †Present address: Department Geosciences, Pennsylvania State Deike Building, University Park, 16802, USA; aab27@psu.edu. Search for other works by this author on: GSW Google Scholar Francesca McInerney; McInerney...
Abstract Silicate weathering is thought to increase and offset the rapid, massive input of CO 2 into atmosphere ocean during Paleocene‐Eocene Thermal Maximum (PETM), but few nonmarine records have been used quantify this. We probe changes in silicate intensity by measuring Li isotope ratios bedrock ancient floodplain deposits spanning PETM Bighorn Basin, Wyoming (USA). Our results reveal a rapid that remained high at least initial stage climate recovery. Additionally, we determine soils...
Abstract We need to explore the geological past predict future of our warming planet. This AGU Special Collection in Paleoceanography and Paleoclimatology comprises latest scientific contributions related 12th Climatic Biotic Events Paleogene Conference. The focus is on Period, a time when Earth's climate was warmer than today. In light ongoing global warming, records may offer valuable insights into climatic conditions. These contain numerous case studies that provide critical resilience...
Rationale We report modifications to compound‐specific isotope analyses (CSIA) enable high‐precision isotopic of picomoles carbon for intact organic molecules. This sample size is two orders magnitude below the amounts required commercial systems. The greatly enhanced sensitivity this system expands molecular studies and applications previously prohibited by low concentrations small samples. Methods utilize resolving power volumetric flow rates narrow‐bore capillary gas chromatography...
Some experiments and observations of free-living plants have found that increasing atmospheric concentration CO2 (pCO2) is directly correlated with discrimination against 13C during photosynthesis (Δ13C) in C3 plants. The inverted form this correlation has been used to estimate pCO2 the geological past (i.e. plant proxy), but there little experimental work establish relative importance as a driver more natural settings over range relevant deep-time geologic record. Here we report on an...
Abstract Plant megafossils from the Paleocene-Eocene Thermal Maximum (PETM) in Bighorn Basin, north-central Wyoming, USA, document a dramatic shift floral composition, whereas palynofloral change same sections has appeared to be more subtle. We investigated this discrepancy by quantifying pollen preservation and measuring stable carbon isotope composition of specific taxa. Pollen grains belonging two common latest Paleocene taxa are poorly preserved PETM samples, their δ13Cpollen is similar...
Abstract. During the summer of 2011, Bighorn Basin Coring Project (BBCP) recovered over 900 m overlapping core from 3 different sites in late Paleocene to early Eocene fluvial deposits northwestern Wyoming. BBCP cores are being used develop high-resolution proxy records Paleocene–Eocene Thermal Maximum (PETM) and 2 (ETM2) hyperthermal events. These events short-term, large magnitude global warming associated with extreme perturbations earth's carbon cycle. Although PETM ETM2 occurred ~55–52...
Abstract Continental sedimentary records of early Paleogene hyperthermals are typically limited to weathered, often discontinuous, outcrop exposures. In 2011, the Bighorn Basin Coring Project (BBCP) collected first continuous terrestrial Paleocene‐Eocene Thermal Maximum (PETM) in Basin, Wyoming. Organic matter preservation was poor during PETM, even core material. Concentrations leaf waxes PETM too low for compound‐specific carbon isotope analysis by conventional means. However, recent...
Glycerol dialkyl glycerol tetraethers (GDGTs) have been widely applied to coastal marine sediments reconstruct past temperature variability. However, environments are characterised by variability in the source, age and/or thermal maturity of different organic carbon (OC) pools and may bias various GDGT-based proxies. Here we analyse TEX86 MBT5ME values within a shallow sediment core (South Dover Bridge, Maryland) from Paleocene-Eocene Thermal Maximum (PETM; 56 million years ago (Ma)) explore...
Compound-specific carbon isotope ratios (CSIA) were measured for a suite of lipid biomarker compounds extracted from immature, late Ediacaran sedimentary rocks drill cores sampled across Baltica. Using newly developed picomolar‐scale CSIA (pico‐CSIA) method, we compositions the abundant n-alkanes and hopanes, as well C29 sterane, pristane, phytane. Total organic (TOC) Kotlin Regional Horizon in Baltica (Saint Petersburg area, Utkina Zavod core), low-salinity coastal environment, is...
We report modifications to a commercial elemental analyzer-isotope ratio mass spectrometer that permit high-precision isotopic analysis of nanomoles carbon (C), nitrogen (N), and sulfur (S) on single sample without chemical or cryogenic trapping gases. The size required for measurement by our system is about two orders magnitude less than conventional analyses.Our builds the analytical advancements offered EA IsoLink IRMS System employs simple reduce diameter flow path (reactors, water trap,...
Over 1/3 of the Earth’s human population relies on dryland ecosystems for food and water resources. While these are highly sensitive to changes in climate, we lack observational data as how hydrology influences plant communities. Paleoecological southern Arabia show woodland communities transitioned more dry-adapted herbaceous plants, which suggests rainfall decreased across Holocene. To assess relationships between ecology, employed leaf wax n -alkane distributions, δ 13 C , δD records from...