A5063272214- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- Groundwater and Isotope Geochemistry
- Isotope Analysis in Ecology
- Indigenous Studies and Ecology
- Fire effects on ecosystems
- Coastal and Marine Dynamics
- Geological Studies and Exploration
- Archaeology and Natural History
- Ecology and biodiversity studies
- Coastal wetland ecosystem dynamics
- Toxic Organic Pollutants Impact
- Peatlands and Wetlands Ecology
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Fish Ecology and Management Studies
- Marine and environmental studies
- Hydrology and Watershed Management Studies
- Oil Spill Detection and Mitigation
The University of Texas at Austin
2023-2025
Istituto di Scienze Marine del Consiglio Nazionale delle Ricerche
2024
United States Geological Survey
2024
Pacific Science Center
2024
Pacific Coastal and Marine Science Center
2024
The University of Texas at Arlington
2020
Abstract Terrestrial groundwater travels through subterranean estuaries before reaching the sea. Groundwater‐derived nutrients drive coastal water quality, primary production, and eutrophication. We determined how dissolved inorganic nitrogen (DIN), phosphorus (DIP), organic (DON) are transformed within estimated submarine discharge (SGD) nutrient loads compiling > 10,000 samples from 216 sites worldwide. Nutrients exhibited complex, nonconservative behavior in estuaries. Fresh DIN DIP...
Accelerating erosion of the Alaska Beaufort Sea coast is increasing inputs organic matter from land to Arctic Ocean, and improved estimates stocks in eroding coastal permafrost are needed assess their mobilization rates under contemporary conditions. We collected three cores (4.5–7.5 m long) along a geomorphic gradient near Drew Point, Alaska, where recent average 17.2 year −1 . Down-core patterns indicate that organic-rich soils lacustrine sediments (12–45% total carbon; TOC) active layer...
Climate warming is causing rapid coastal change in the Arctic. Permafrost thaw subsidence, sea-level rise, and erosion each threaten Arctic nearshore. These agents of have received unequal attention their compound impact remains poorly understood. Alaska's Coastal Plain (ACP) ideal for addressing this knowledge gap due to region’s relatively abundant observational data importance Indigenous communities, socioeconomics, geopolitics. We present first projections 21st century ACP evolution that...
Abstract Coastal erosion mobilizes large quantities of organic matter (OM) to the Arctic Ocean where it may fuel greenhouse gas emissions and marine production. While biodegradability permafrost‐derived dissolved carbon (DOC) has been extensively studied in inland soils freshwaters, few studies have examined OM (DOM) leached from eroding coastal permafrost seawater. To address this knowledge gap, we sampled three horizons bluff exposures near Drew Point, Alaska: seasonally thawed active...
Abstract Fresh submarine groundwater discharge (FSGD) can deliver significant fluxes of water and solutes from land to sea. In the Arctic, which accounts for ∼34% coastlines globally, direct observations knowledge FSGD are scarce. Through integration process‐based models, we found that regardless ice‐bonded permafrost depth at shore, summer SGD flow dynamics along portions Beaufort Sea coast Alaska similar those in lower latitudes. Calculated Arctic generally higher relative low The organic...
Arctic shorelines are vulnerable to climate change impacts as sea level rises, permafrost thaws, storms intensify, and ice thins. Seventy-five years of aerial satellite observations have established coastal erosion an increasing hazard. However, other hazards at play—for instance, the cumulative impact that sea-level rise thaw subsidence will on shorelines—have received less attention, preventing assessments these processes’ compared combined with erosion. Alaska’s Coastal Plain (ACP) is...
{Abstract:[Permafrost cores (4.5-7.5 m long) were collected April 10th-19th, 2018, along a geomorphic gradient near Drew Point, Alaska to characterize active layer and permafrost geochemistry material properties. Cores from young drained lake basin, an ancient primary surface that has not been reworked by thaw cycles. Measurements of total organic carbon (TOC) nitrogen (TN) content, stable isotope ratios (δ13C) radiocarbon (14C) analyses bulk soils/sediments conducted on 45 samples 3 cores....