Ocean acoustics, sonar array processing, acoustic telemetry of the ocean and matched field array processing.
Physics and engineering of 3D optical systems for use in autonomous devices to capture digital holographic images of ocean species (e.g. plankton) and multi-phase flows.
Co-evolution of life and the environment on early Earth; study of the microfossil record associated with major climatic and geochemical oscillations in the Neoproterozoic.
Marine chemistry: distribution of trace elements in the ocean and their use as paleochemical tracers; response of the ocean to anthropogenic lead emissions; relation between dust, iron in the ocean, and marine biological activity.
Microbial oceanography: the role of marine phytoplankton in the ocean’s “metabolism”; the cyanobacterium Prochlorococcus as a model to study marine ecology from the genome level to the whole ocean.
Development of technology and systems for advanced autonomous surface and underwater vehicles.
Structure, function and ecological significance of natural microbial communities in a variety of marine habitats.
Ocean circulation: dynamics of the ocean and climate, atmospheric and oceanic turbulence, air-sea interactions, the energetics of the ocean circulation, the impact of ocean physics on biology, and paleoclimate.
Environmental organic chemistry: phase exchanges and transformation processes; the modeling of fates of organic pollutants; the roles of colloids and black carbons; and passive sampling for site evaluation.
Earth’s biochemical cycles and development of novel observational systems to study those cycles; methods to interact sustainably with the natural environment.
Ocean modeling: development of software, computing infrastructure and numerical algorithms for simulation of atmospheric, oceanic and geophysical flows.
Design methods for complex ocean systems; autonomous inspection of in-water ships; design of ocean networks comprising groups of communicating vehicles as well as fluid and power systems.
Navigation and mapping for autonomous mobile robots, robotic localization and mapping applications below, on and above water in marine and river environments.
Ocean modeling and data assimilation techniques to quantify regional ocean dynamics on multiple scales; new methods for multiscale modeling, uncertainty quantification, data assimilation and the guidance of autonomous vehicles.
Development of tools for analysis and design of advanced ocean systems including ships, offshore platforms, and underwater vehicles. Development of tools for ocean wave prediction. Wave/tide energy extraction, and advanced propulsion.
Ocean exploration, remote sensing of marine life and geophysical phenomena, census of marine life, ocean acoustics, and hurricane classification.
Climate and the general circulation of the atmosphere and oceans; development of mathematical and numerical models of key physical and biogeochemical processes, oceans and climate, and paleoclimate.
Study of paleoclimate using geochemical tools, with focus on applications of uranium-series isotopes; improved understanding of the response of atmospheric circulation and the hydrological cycle to different boundary conditions.
Historian and electrical engineer, an expert on human/machine relationships in broad technical, social, and historical contexts.
Physical mechanisms which affect the transport and fate of contaminants and nutrients in surface water systems; wetland hydrodynamics, vegetated flow dynamics, and lake physics.
Interplay among atmosphere, rock, water and microbes; the photochemical sulfur isotope effect, early microbial evolution, deep biosphere, and seafloor hydrothermal deposits.
Research interests are in the general area of signal processing and its applications: coauthor of the widely used textbooks Discrete-Time Signal Processing and Signals and Systems.
Robotics and Sensing, Dynamic Data-Driven Forecasting Systems, Computer-Aided Design, Visualization.
Laboratory experiments to obtain insight into all manner of dynamical phenomena, from micro-scale diffusive processes to global-scale oceanic wave fields.
Exploration of structure-function relationships in microbial communities using quantitative molecular approaches, genomics, physiology, and modeling.
Dynamical organization of the natural environment through investigation of the cooperative phenomena underlying common yet poorly understood observations. Work combines theory, field observations, and experiments to study problems including the carbon cycle and climate, the co-evolution of life and the environment, and the dynamics of fluids, rocks, and sand.
Distributed robotics, mobile computing, programmable matter and applications in environmental robotics.
Arctic and shallow water acoustics; scattering and reverberation due to sea surface and ice roughness; determination of seismic-acoustic propagation and reverberation in ocean environments; and 3-D acoustics in very shallow water.
Modeling of free surface flows past conventional and high-speed vessels and the estimation of their resistance and seakeeping in deep and shallow waters. Coupling of hydrodynamic simulations with optimal control theory for the minimization of the motions and the fuel efficient navigation of vessels.
My research focuses on using atmospheric chemistry modeling to inform decision-making strategies on air pollution, climate change and hazardous substances such as mercury and persistent organic pollutants (POPs).
Design and manufacture of innovative medical devices, precision machines and components, and energy systems, including offshore, floating wind turbines.
Physical ecology of microorganisms; microscale transport phenomena; microfluidic experiments to understand how physical forces and chemical signals shape the behavior of marine microorganisms.
Biogeochemistry and geobiology: lipid chemistry of geologically significant microbes and microbial ecosystems; organic and isotopic indicators of climate change; evolution and mass extinction; biomarkers in sediments and petroleum; and biogeochemical fossils.
Solving hydrodynamics problems for use by the ocean science and engineering communities through rigorous experimental investigation and imaging.
Microbial oceanography: study of the relationship between the structure of microbial communities and their function using molecular biology, genomics, and genetics.
Physics of flow-sensing in fish and marine mammals; achieving super-maneuverability in ocean vehicles through flow feedback control; development of biometric robots to study the agility of fish and cetaceans.
Dynamics of offshore structures and flow-induced vibration.
Understanding ocean circulation and its implications for climate and paleoclimate by combining global general circulation models and the recently available global data sets.
Marine fluid mechanics and ocean engineering: problems ranging from coastal and offshore development to understanding the role of oceans in global warming.