A5088482958- Climate change and permafrost
- Cryospheric studies and observations
- Peatlands and Wetlands Ecology
- Meteorological Phenomena and Simulations
- Arctic and Antarctic ice dynamics
- Indigenous Studies and Ecology
- Atmospheric aerosols and clouds
- Icing and De-icing Technologies
- Environmental DNA in Biodiversity Studies
- Lightning and Electromagnetic Phenomena
- Soil and Environmental Studies
- Nuclear and radioactivity studies
- Groundwater and Isotope Geochemistry
- Botany and Plant Ecology Studies
- Geological Modeling and Analysis
- Methane Hydrates and Related Phenomena
- Surface Modification and Superhydrophobicity
Los Alamos National Laboratory
2019-2024
New Mexico Institute of Mining and Technology
2019-2020
Abstract One of the most intense air mass transformations on Earth happens when cold flows from frozen surfaces to much warmer open water in cold-air outbreaks (CAOs), a process captured beautifully satellite imagery. Despite ubiquity CAO cloud regime over high-latitude oceans, we have rather poor understanding its properties, role energy and cycles, treatment weather climate models. The Cold-Air Outbreaks Marine Boundary Layer Experiment (COMBLE) was conducted better understand this...
Abstract. Ice-wedge polygons are common Arctic landforms. The future of these landforms in a warming climate depends on the bidirectional feedback between rate ice-wedge degradation and changes hydrological characteristics. This work aims to better understand relative roles vertical horizontal water fluxes subsurface polygonal landscapes, providing new insights data test calibrate models. Field-scale investigations were conducted at an intensively instrumented location Barrow Environmental...
Abstract Convective clouds play an important role in the Earth’s climate system and are a known source of extreme weather. Gaps our understanding convective vertical motions, microphysics, precipitation across full range aerosol meteorological regimes continue to limit ability predict occurrence intensity these cloud systems. Towards improving predictability, National Science Foundation (NSF) sponsored large field experiment entitled “Experiment Sea Breeze Convection, Aerosols,...
Abstract. In Arctic ecosystems, increasing temperatures are driving the expansion of nitrogen (N) fixing shrubs across tundra landscapes. The implications this to biogeochemistry ecosystems is critical importance, yet many details about form, location, and availability N from these remain unknown. To address knowledge gap, spatiotemporal variability nitrate (NO3−) its environmental edaphic controls were investigated at an alder (Alnus viridis spp. fruticosa) dominated permafrost landscape in...
Abstract. In Arctic ecosystems, increasing temperatures are driving the expansion of nitrogen (N) fixing shrubs across tundra landscapes. The implications this to biogeochemistry ecosystems critical importance and more work is needed better understand form, availability, transportation potential N from these a variety To gain insights into processes controlling within permafrost hillslope system, spatiotemporal variability nitrate (NO3-) its environmental controls were investigated at an...
Abstract. Ice-wedge polygons are common Arctic landforms. The future of these landforms in a warming climate depends on the bidirectional feedback between rate ice-wedge degradation and changes hydrological characteristics. This work aims to better understand relative roles vertical horizontal water fluxes subsurface polygonal landscapes, providing new insights data test calibrate hydrology models. Field-scale investigations were conducted at an intensively-instrumented location Barrow...
Climate-driven permafrost thaw alters the strongly coupled carbon and nitrogen cycles within Arctic tundra, influencing availability of limiting nutrients including nitrate (NO3−). Researchers have identified two primary mechanisms that increase NO3− soils: (1) ‘frozen feast’, where previously frozen organic material becomes available as it thaws, (2) ‘shrubification’, expansion nitrogen-fixing shrubs promotes increased soil nitrogen. Through synthesis original published observational data,...
Soil pore water: water samples were collected by installing macro-rhizons (Rhizosphere Research Products; hereby referred to as rhizons) using the methods described Seeberg-Elverfeldt (2005).Rhizons, which have a porous tip through can pass free of ion exchange, installed at depths between 15-30 cm, and due volume required for chemical analyses, in nests (on average 5 rhizons per nest) each sampling location depending on soil saturation availability.Soil was 60-ml syringes connected...