A5052228598- Oceanographic and Atmospheric Processes
- Gamma-ray bursts and supernovae
- Tropical and Extratropical Cyclones Research
- Ocean Waves and Remote Sensing
- Marine and coastal ecosystems
- Marine and fisheries research
- Underwater Acoustics Research
- Climate variability and models
- Pulsars and Gravitational Waves Research
- Geology and Paleoclimatology Research
- Coastal and Marine Dynamics
- Geological formations and processes
- Magnetic Bearings and Levitation Dynamics
- Astrophysics and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Environmental Monitoring and Data Management
- Particle Accelerators and Free-Electron Lasers
- Fluid Dynamics and Turbulent Flows
- Advanced X-ray Imaging Techniques
- Astronomical Observations and Instrumentation
- Radiation Detection and Scintillator Technologies
- Meteorological Phenomena and Simulations
- Electric Motor Design and Analysis
University of Massachusetts Dartmouth
2002-2023
University of Massachusetts Amherst
2012
MIT Lincoln Laboratory
2009
Providence College
1930-2008
Lawrence Livermore National Laboratory
2004
Lawrence Livermore National Security
2003
University of New Hampshire
1978-2002
Plasma Technology (United States)
2002
Fusion Academy
2002
Fusion (United States)
2002
During 1989–1992, six different anticyclonic eddies were observed to translate up the coast of South America between 7°N and 12°N. These eddies, which are similar those recently with coastal zone color scanner images, current meters, altimetry, inferred have formed from pieces North Brazil Current, retroflects or veers offshore near flow eastward. The maximum near‐surface diameter when newly is estimated be 400 km. retroflection identified in trajectories four surface drifters three SOFAR...
The analysis of the hydrographic data obtained during “Nordeste III” (NEIII) survey by R/V Almirante Saldanha (Brazilian Navy) between May 4 and July 12, 1986, is reported in this work. Distributions geostrophic speeds transports (relative to 1000 m) reveal North Brazil Current (NBC) other major features tropical Atlantic circulation west 30°30′W 4°S 10°30′S. well‐developed NBC appears all analyzed crossisobath sections bordering Brazilian continental slope 10°S 5°S, transporting an average...
Pressure fluctuations on the deep seafloor at frequencies below inertial and tidal have been measured. Between 0.1 1 cycle per day variance is about 2 mb2, spectra diminish with increasing frequency as ω−n, n=1.5 to 2, a signal-to-instrument noise ratio of 10 dB achieved. Fluctuations are in phase highly coherent within MODE area (>0.95 200 km) even inferred (atmosphere plus sea level) Bermuda subsurface pressures (0.8 700 km). Station differences (to which MODE-sized eddies would make...
Abstract The Mid-Atlantic Regional Coastal Ocean Observing System (MARCOOS) High-Frequency Radar Network, which comprises 13 long-range sites, 2 medium-range and 12 standard-range is operated as part of the Integrated System. This regional implementation network has been operational for years matured to point where radars provide consistent coverage from Cape Cod Hatteras. A concerted effort was made in MARCOOS project increase resiliency radar stations elements, power issues, other issues...
The mean circulation on the northeast continental shelf in region of Gulf Mexico is discussed terms a simple box model, based volume transports and salinities estimated from existing data. results this calculation indicate that warm salty water slope must mix with colder, fresher at intermediate depths within Gulf. Field measurements obtained as part study winter an offshore western Maine suggest storms may be responsible for most vertical mixing. Ten 1-day hydrographic cruises wore...
The annual variation in the structure and disposition of principal water masses Gulf Maine has been investigated with a set property observations using five shipboard surveys four moored arrays data telemetry. time series document cooling-induced destratification upper column during autumn subsequent mixed-layer deepening western Gulf-primarily Wilkinson Basinduring winter 1987. Unusually large amounts fresher Scotian Shelf Water inflow inhibited 1987 vertical mixing eastern relative to deep...
Oceanography is evolving from a shipbased expeditionary science to distributed, observatory‐based approach in which scientists continuously interact with instruments the field. These new capabilities will facilitate collection of long‐term time series while also providing an interactive capability conduct experiments using data streaming real time. The U.S. National Science Foundation has funded Ocean Observatories Initiative (OOI), over next 5 years deploy infrastructure expand scientists'...
The Nantucket Shoals Flux Experiment (NSFE) was a collaborative effort to measure the alongshelf transport of mass, heat, salt and nutrients from March 1979 through April 1980 with dense army consisting moored current, temperature bottom pressure instruments in an across-shelf upper-slope transect south Island. component that experiment is described here. Bottom recorders were deployed at stations N1 (46 m), N2 (66 N4 (105 N5 (196 m) during two half-year periods. spring–summer (SUMMER)...
An approximate analytical solution is presented for the variation of local heat-transfer coefficient over forward half a uniformly heated sphere. Experimental measurements with water Reynolds number range 5000 to 480,000 and Prandtl 2.2 6.8 give coefficients which are in good agreement results. Average sphere slightly higher than similar results reported earlier [1] an isothermal The effect variations heat flux on average correlated manner that was used data. Three different duct sizes were...
Abstract A decade (2007–2016) of hourly 6‐km‐resolution maps the surface currents across Mid‐Atlantic Bight (MAB) generated by a regional‐scale High Frequency Radar network are used to reveal new insights into spatial patterns annual and seasonal mean flows. Across 10‐year time series, temporal means interannual intra‐annual variability quantify current patterns. The flows weaker mostly cross‐shelf near coast, increasing in speed rotating more alongshore directions shelfbreak, flow off‐shelf...
The annual evolution of the geostrophic flow structure in Gulf Maine was studied with a combined set moored pressure time-series measurements and five hydrographic surveys from August 1986 through September 1987. A series quasi-synoptic dynamic height maps depicts gulf whose typical spatial scales decrease order 100 km during winter to about half that summer, when surface, intermediate, deep water masses is most rapid complex. unusually large amount freshwater 1987 partially responsible for...
The wintertime circulation in the western Gulf of Maine has been studied with a moored current, temperature and pressure array which was deployed from November 1974 to January 1975. These observations have interpreted three additional data sets: coastal sea level records, Portland Lightship meteorological data, offshore hydrographic transect describe evolution density field on weekly time scales. observed mean currents are consistent idea cyclonic gyre. subtidal current fluctuations were...
The transition to turbulence in the convective flow of air between horizontal plates a circular convection chamber has been investigated. Measurements heat flux and instantaneous spatial temperature field were made simultaneously for range Rayleigh number Ra 3 × 103 5 104. could be varied by changing vertical separation or difference plates. was measured with either array resistance wires mounted so that traversed at velocities much greater than characteristic thermal convection. Slope...
Abstract Autonomous underwater gliders have proven to be a cost-effective technology for measuring the 3-D ocean and now represent critical component during design implementation of Mid-Atlantic Regional Ocean Observing System (MARCOOS), Region U.S. Integrated System. The been conducting regional surveys (MA) Bight, 3 years MARCOOS, glider fleet has conducted 22 missions spanning 10,867 km collecting 62,824 vertical profiles data. In addition data, facilitated collaboration partners outside...
The semidiurnal tidal currents associated with the near-resonant response of Gulf Maine-Bay Fundy system are amplified over relatively shallow depths Georges Bank, thus leading to enhanced energy dissipation, vertical mixing and secondary flows on Bank. Within western Maine sea level amplitudes larger but less energetic than those observed while New England shelf is least three regions. In this paper we explore some details dynamics in these very different regimes by estimating terms...
During the Coastal Ocean Dynamics Experiment (CODE) along northern California continental shelf in spring and summer of 1981 1982, first comprehensive effort to obtain all observations necessary infer pressure fluctuations throughout water column was made. This is a description subtidal measured bottom pressure, internal pressures inferred from moored conductivity temperature observations, total anomalies computed combination two components. The field during CODE 2 (April‐July 1982) found be...
A series of intermittent interval wave events were observed at a single site in 133 m water on the northern California continental shelf during Coastal Ocean Dynamics Experiment 1981. Simultaneous time‐series observations temperature and conductivity used to infer isotherm isopycnal depths which combined with current develop kinematic description an average internal event. The event described consists downward displacement middepth isopycnals corresponding increase upper‐layer minus...
IGPP and AOML bottom pressure measurements at four MODE stations constitute a unique set of deep-sea tidal (although deployed for other purposes). A response analysis relative to Bermuda reference has been optimized with regard the number complex weights makeup gravitational radiational inputs. Duplicate instrumentation on EDIE capsule gave 32.067, 2.5° 32.074, 2.6° M2 amplitude (cm) Greenwich epoch, thus attesting reality measured small station differences (order 1 cm, 1°). currents...