A5029643395- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Cryospheric studies and observations
- Climate change and permafrost
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Statistical Methods and Inference
- Markov Chains and Monte Carlo Methods
- Marine and Coastal Research
- Marine and coastal ecosystems
- Statistical Mechanics and Entropy
- Gaussian Processes and Bayesian Inference
- Data-Driven Disease Surveillance
- Arctic and Russian Policy Studies
- Geology and Paleoclimatology Research
- Meteorological Phenomena and Simulations
- Air Quality and Health Impacts
- Forensic and Genetic Research
- Atmospheric Ozone and Climate
- Laser-Ablation Synthesis of Nanoparticles
- Marine and fisheries research
- Ocular and Laser Science Research
- Bacillus and Francisella bacterial research
Oregon State University
2015-2024
John Brown University
2023-2024
Brown University
2023-2024
Cooperative Institute for Research in Environmental Sciences
2023
NOAA Physical Sciences Laboratory
2023
Drexel University
2015-2019
Pacific Northwest National Laboratory
2013
Nanospectra Biosciences (United States)
2005
Sea ice thickness is a key parameter in the polar climate and ecosystem. Thermodynamic dynamic processes alter sea thickness. The Multidisciplinary drifting Observatory for Study of Arctic Climate (MOSAiC) expedition provided unique opportunity to study seasonal changes same ice. We analyzed 11 large-scale (∼50 km) airborne electromagnetic surface roughness surveys from October 2019 September 2020. Data mass balance position buoys additional information. found that thermodynamic growth decay...
Background and Objective Gold nanoshells are a new class of nanoparticles that can be designed to strongly absorb light in the near infrared (NIR). These particles provide much larger absorption cross-sections efficiency than achieved with currently used chemical chromophores without photobleaching. In these studies, we have investigated use gold as exogenous NIR absorbers facilitate laser-tissue welding. Study Design/Materials Methods peak extinction matching wavelength laser being were...
Abstract. In September 2019, the research icebreaker Polarstern started largest multidisciplinary Arctic expedition to date, MOSAiC (Multidisciplinary drifting Observatory for Study of Climate) drift experiment. Being moored an ice floe a whole year, thus including winter season, declared goal is better understand and quantify relevant processes within atmosphere–ice–ocean system that impact sea mass energy budget, ultimately leading much improved climate models. Satellite observations,...
Central Arctic properties and processes are important to the regional global coupled climate system. The Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) Distributed Network (DN) autonomous ice-tethered systems aimed bridge gaps in our understanding temporal spatial scales, particular with respect resolution Earth system models. By characterizing variability around local measurements made at a Observatory, DN covers both interactions involving ocean-ice-atmosphere...
Abstract Sea ice modulates the energy exchange between atmosphere and ocean through its kinematics. Marginal zone (MIZ) dynamics are complex not well resolved in routine observations. Here, we investigate sea Greenland MIZ using situ remote sensing Lagrangian drift datasets. These datasets provide a unique view into spanning spatial scales. We find evidence of tidal currents strongly affecting sub‐daily motion. Velocity anomalies show abrupt transitions aligned with gradients seafloor...
Abstract A network of autonomous, ice-tethered buoys was deployed around the Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC) experiment in late September 2019 a year-long drift Transpolar Drift Stream. The were as part MOSAiC distributed (DN) which included 12 multi-instrumented ice stations and an additional 116 GPS primarily within 40 km radius Central Observatory. Buoy coverage DN maintained with deployments throughout allowing collection data over full sea growth...
The Fram Strait is a key region for ice export, linking the Arctic with world ocean. We present floe-scale observations of sea motion in marginal zone (MIZ) derived from moderate-scale optical imagery spanning 2003-2020 period. Tracked floes provide Lagrangian measures during spring and summer. show that floe size distribution affects rotation rates fluctuating velocities floes. Using simulations based on quasi-geostrophic ocean model discrete element model, we eddy forcing alone can produce...
Central Arctic properties and processes are important to the regional global coupled climate system.The Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) Distributed Network (DN) autonomous ice-tethered systems aimed bridge gaps in our understanding temporal spatial scales, particular with respect resolution Earth system models.By characterizing variability around local measurements made at a DN covers both interactions involving ocean-ice-atmosphere interfaces as well...
Abstract Arctic cyclones are key drivers of sea ice and ocean variability. During the 2019–2020 Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition, joint observations coupled air‐ice‐ocean system were collected at multiple spatial scales. Here, we present a strong mid‐winter cyclone that impacted MOSAiC site as it drifted in central pack ice. The dynamical response showed structure scale evolving translating cyclonic wind field. Internal stress play significant...
Sea ice mediates the exchange of momentum, heat, and moisture between atmosphere ocean. Cyclones produce strong gradients in wind field, imparting stress into causing to deform. In turn, increased sea drift speeds rapid changes direction during passage a cyclone may result enhanced momentum flux upper During year-long MOSAiC expedition, an array drifting buoys was deployed surrounding R/V Polarstern, enabling characterization motion deformation across range spatial scales. addition,...
Personal samplers used to determine the inhalable fraction of workplace dust are tested while mounted on a manikin, which simulates worker. To understand mechanisms affecting performance such samplers, researchers must measure airflow around body where mounted. Therefore, wind tunnel facilities both conditions and sampling efficiency needed. A system was developed that large enough accommodate top half life-sized manikin employed laser Doppler velocimeter for velocity measurements manikin....
Arctic cyclones are key drivers of sea ice and ocean variability. During the 2019-2020 Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition, joint observations coupled air-ice-ocean system were collected at multiple spatial scales. Here, we present a pair strong mid-winter that impacted MOSAiC site as it drifted in central pack ice, with analytic emphasis on second cyclone. The dynamical response showed structure scale evolving atmospheric wind field. Internal stress...
The Fram Strait is a key region for sea ice export, connecting the Arctic Ocean and world ocean. Sea motion in complex, with transitions from pack to marginal zone, sharp gradients ocean currents, strong year-to-year variability. Characterizing dynamics zone (MIZ) challenging. In situ observations buoys are sparse, low spatial correlation velocity means that do exist often not representative of nearby areas. Similarly, standard satellite-based observation methods lack resolution resolve...
Chemical and biological forensic programs rely on laboratory measurements to determine how a threat agent may have been produced. In addition analyses, it also be useful identify institutions where the same has produced by (or similar) process, since producer of learned methods at university or similar institution. this paper, we evaluate Bayesian network that combines results with evidence from scientific literature probabilistically rank published papers interest. We apply techniques...
MOSAiC was a rare opportunity to obtain observational data on Arctic cyclones (ACs), with at least 22 ACs sampled during four of the five legs.  This presentation will illustrate how some AC cloud and boundary-layer characteristics produce both thermodynamic dynamic impacts sea ice in non-melt seasons.  Deep clouds associated enhanced downwelling radiation, surface radiation dependent height, temperature, liquid water layers.  Underneath warm fronts ahead ACs, this...
Sea ice modulates the energy exchange between atmosphere and ocean through its kinematics.Marginal zone (MIZ) dynamics are complex not well resolved in routine observations.Here, we investigate sea Greenland MIZ using two Lagrangian drift datasets.We find evidence of tidal currents strongly affecting sub-daily motion. Velocity anomalies show abrupt transitions aligned with gradients seafloor topography, indicating changes currents. Remote-sensed floe trajectories derived from moderate...
Ice Floe Tracker is an open-source tool designed to retrieve floe-scale sea ice motion in the Arctic marginal zone during spring and summer. enables observation of floe size distribution, rotation rates, small-scale variation velocity, individual trajectories. Sea occurs on a wide range scales, from interaction pieces at sub-meter formation linear kinematic features, transport via basin-wide gyres. Most existing methods for tracking remote sensing imagery rely cross-correlation are optimized...
One way of getting insight into non-Gaussian measures is to first obtain good Gaussian approximations. These best fit Gaussians can then provide a sense the mean and variance distribution interest. They also be used accelerate sampling algorithms. This begs question how one should measure optimality, this optimal approximation. Here, we consider problem minimizing distance between family target with respect relative entropy, or Kullback-Leibler divergence. As are interested in applications...
Earth and Space Science Open Archive posterOpen AccessYou are viewing the latest version by default [v1]Seasonality of Lower Tropospheric Stability in Community System Model Large EnsembleAuthors Daniel Watkins iD Jennifer Hutchings See all authors WatkinsiDCorresponding AuthorOregon State UniversityiDhttps://orcid.org/0000-0003-3173-152Xview email addressThe was not providedcopy addressJennifer HutchingsOregon Universityview address