A5020826484- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Climate change and permafrost
- Hydrocarbon exploration and reservoir analysis
- Cryospheric studies and observations
- Geological and Geophysical Studies
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Archaeology and ancient environmental studies
- Geophysics and Gravity Measurements
- Plant Water Relations and Carbon Dynamics
- Paleontology and Stratigraphy of Fossils
- Isotope Analysis in Ecology
- Hydrology and Watershed Management Studies
- Winter Sports Injuries and Performance
- Aquatic Ecosystems and Phytoplankton Dynamics
- Groundwater and Isotope Geochemistry
- Hydraulic Fracturing and Reservoir Analysis
- Geological formations and processes
- Tree-ring climate responses
- Maritime and Coastal Archaeology
- Infrastructure Maintenance and Monitoring
University at Buffalo, State University of New York
2019-2024
University of Vermont
2023
NOAA National Marine Fisheries Service Southwest Fisheries Science Center
2023
Planetary Science Institute
2022
Rutgers, The State University of New Jersey
2022
Arctic precipitation is predicted to increase in the coming century, due a combination of enhanced northward atmospheric moisture transport and local surface evaporation from ice-free seas. However, large model uncertainties, limited long-term observations, high spatiotemporal variability limit our understanding these mechanisms, emphasizing need for paleoclimate records changes. Here we use lipid biomarkers lake sediments reconstruct seasonality northern Spitsbergen, Svalbard. We measured...
Abstract Lacustrine δ 2 H and 18 O isotope proxies are powerful tools for reconstructing past climate precipitation changes in the Arctic. However, robust paleoclimate record interpretations depend on site‐specific lake water systematics, which poorly described eastern Canadian Arctic due to insufficient modern data. We use isotopes (δ H) collected between 1994–1997 2017–2021 from a transect of sites spanning Québec‐to‐Ellesmere Island gradient evaluate effects inflow seasonality evaporative...
Abstract The multi‐million year history of the Greenland Ice Sheet remains poorly known. Ice‐proximal glacial marine diamict provides a direct but discontinuous record ice sheet behavior; it is underutilized as climate archive. Here, we present novel multiproxy analysis an Early Pleistocene from northwestern Greenland. Low cosmogenic nuclide concentrations indicate minimal near‐surface exposure, similar to modern terrestrial sediment. Detrital apatite (U‐Th‐Sm)/He (AHe) ages all predate...
Abstract Quantitative temperature reconstructions from lacustrine organic geochemical proxies including branched glycerol dialkyl tetraethers (brGDGTs) and alkenones provide key constraints on past continental climates. However, estimation of air temperatures can be impacted by non‐stationarity in the relationships between seasonal water temperatures, a factor not yet examined strongly high‐latitude settings. We pair downcore analyses brGDGTs measured same samples through Holocene with...
Abstract Changes in ice‐sheet size impact atmospheric circulation, a phenomenon documented by models but constrained few paleoclimate records. We present sub‐centennial‐scale records of summer temperature and precipitation hydrogen isotope ratios (δ 2 H) spanning 12–7 ka from lake on Baffin Island. In transient model simulation, winds this region were controlled the relative strength high‐pressure systems associated anticyclonic circulation over retreating Greenland Laurentide ice sheets....
Abstract The last deglaciation in northern Europe provides an opportunity to study the hydrologic component of abrupt climate shifts a region with complex interactions between ice sheets and oceanic atmospheric circulation. We use leaf wax hydrogen isotopes (δ 2 H) reconstruct summer precipitation δ H aridity southwestern Norway from 15.8 11.5 ka. identify transitions more proximal moisture source before ends Heinrich Stadial 1 Younger Dryas, prior local warming increased primary...
ABSTRACT The Russian Arctic is an extensive region, with relatively few long‐duration paleoclimate reconstructions compared to other terrestrial regions. We present a 24 000‐year reconstruction of climate in the Polar Ural Mountains using n ‐alkanoic acid hydrogen isotopes from Lake Bolshoye Shchuchye. Major last deglaciation changes North Atlantic are this record, including transitions associated Bølling–Allerød, Younger Dryas and Holocene. However, magnitude isotopic shifts at Shchuchye...
Svalbard spans large climate gradients, associated with atmospheric circulation patterns and variations in ocean heat content sea ice cover. Future precipitation increases are projected to peak the northeast mainly occur winter, but uncertainties underscore need for reconstructions of long‐term spatial temporal amounts seasonality. We use lipid biomarkers from four sedimentary lake records along a climatic gradient western northeastern reconstruct Holocene water cycle changes. measured leaf...
<p>The Greenland Ice Sheet (GrIS) is melting in response to a rapidly warming climate.  It imperative understand GrIS sensitivity past climate, especially during periods when the ice sheet was smaller than present or possibly absent. The Camp Century core from NW Greenland, collected 1966 and first be drilled bed of GrIS, revolutionized our understanding global paleoclimate since 125 ka. However, basal sediment not fully explored then sat storage for decades...
Submarine groundwater discharge is increasingly recognized as an important component of the oceanic geochemical budget, but knowledge distribution this phenomenon limited. To date, reports meteoric inputs to marine sediments are typically limited shallow shelf and coastal environments, whereas contributions freshwater along deeper sections tectonically active margins like Chilean Margin have generally been attributed silicate diagenesis, mineral dehydration, or methane hydrate dissociation....
Changes in ice sheet size and configuration impact global moisture heat transport, but few proxy records examine these impacts. High-latitude precipitation-isotope are often interpreted to reflect temperature change, can also changes source. We present independent sub-centennial-scale of summer precipitation δ2H from the same lake sediment archive on northeastern Baffin Island. published TraCE-21k transient model simulation results. These span 12 7 ka, when Laurentide Ice Sheet...
Constraining the hydrological response to past climate change can improve model predictions. These constraints are most useful when provided in variables that native models (e.g., precipitation or soil water isotope values during a defined season). Leaf wax hydrogen isotopes extracted from lake sediments valuable proxies reconstruct cycle. In some lakes, multiple leaf compounds may provide information about different aspects of system seasonality, growing season evaporation, etc.),...
Abstract Submarine groundwater discharge is increasingly recognized as an important component of the oceanic geochemical budget, but knowledge distribution this phenomenon limited. To date, reports meteoric inputs to marine sediments are typically limited shallow shelf and coastal environments, whereas contributions freshwater along deeper sections tectonically active margins have generally been attributed silicate diagenesis, mineral dehydration, or methane hydrate dissociation. Here, using...
Pore water freshening (i.e., decreases in dissolved Cl) has been documented marine sediments along most active margins, with the migration of deep fluids or methane hydrate dissociation often invoked as sources sediment column. During D/V JOIDES Resolution Expedition 379T 2019, two new sites (J1005 and J1006) were cored near ODP Site 1233 (41°S), adjacent to a seafloor mound venting structure. The three are less than 10 km apart but show marked differences pore chemistry occurrence. extent...