A5045304397- Oceanographic and Atmospheric Processes
- Underwater Acoustics Research
- Climate variability and models
- Underwater Vehicles and Communication Systems
- Ocean Waves and Remote Sensing
- Meteorological Phenomena and Simulations
- Seismic Waves and Analysis
- Marine and coastal ecosystems
- Tropical and Extratropical Cyclones Research
- Marine animal studies overview
- Arctic and Antarctic ice dynamics
- Seismic Imaging and Inversion Techniques
- Geophysical Methods and Applications
- Marine and fisheries research
- Geophysics and Gravity Measurements
- Reservoir Engineering and Simulation Methods
- Geological and Geophysical Studies
- Geology and Paleoclimatology Research
- Coastal and Marine Dynamics
- Acoustic Wave Phenomena Research
- Atmospheric and Environmental Gas Dynamics
- Speech and Audio Processing
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Structural Health Monitoring Techniques
Scripps Institution of Oceanography
2016-2025
University of California, San Diego
2016-2025
Woods Hole Oceanographic Institution
1981-2021
University of Science and Technology
2021
NOAA National Centers for Environmental Prediction
2020
National Oceanic and Atmospheric Administration
2001-2020
University of Colorado Boulder
2020
Palau International Coral Reef Center
2019
Indian Institute of Technology Madras
2019
Naval Postgraduate School
2019
Abstract The Pacific decadal oscillation (PDO), defined as the leading empirical orthogonal function of North sea surface temperature anomalies, is a widely used index for variability. It shown that PDO can be recovered from reconstruction anomalies based on first-order autoregressive model and forcing by variability Aleutian low, El Niño–Southern Oscillation (ENSO), oceanic zonal advection in Kuroshio–Oyashio Extension. latter results Rossby waves are forced Ekman pumping. SST response...
Satellite altimetric height was combined with approximately 1,000,000 in situ temperature profiles to produce global estimates of upper ocean heat content, temperature, and thermosteric sea level variability on interannual timescales. Maps these quantities from mid‐1993 through mid‐2003 were calculated using the technique developed by Willis et al. [2003] . The time series globally averaged content contains a small amount implies an oceanic warming rate 0.86 ± 0.12 watts per square meter...
Travel times of reciprocal 1000-km range acoustic transmissions, determined from the 1987 Reciprocal Tomography Experiment, are used to study barotropic tidal currents and a large-scale, coherent baroclinic tide in central North Pacific Ocean. The difference travel determines currents, while sum displacement isotachs (or equivalently, isotherms). current accounts for 90% observed differential time variance. measured harmonic constants eight major constituents meter measurements agree well...
Ocean data assimilation is increasingly recognized as crucial for the accuracy of real-time ocean prediction systems. Here, current status in support operational demands analysis and forecasting reviewed, focusing on methods currently adopted Significant challenges associated with most commonly employed approaches are identified discussed. Overarching issues faced by general also addressed, important future directions response to scientific advances, evolving forthcoming observing systems...
[1] Three years of continuous Spray glider observations in the southern California Current System (CCS) are combined with a numerical simulation to describe mean and variability poleward flows CCS. Gliders provide upper ocean good across-shore temporal resolution along two survey lines while provides dynamically consistent estimate state. Persistent observed three areas: within 100 km coast at Point Conception, Southern Bight (SCB), offshore SCB Santa Rosa Ridge (SRR). Poleward transport by...
The largest climate anomaly of the last 1000 years in Northern Hemisphere was Little Ice Age (LIA) from 1400–1850 C.E., but little is known about signature this event Southern Hemisphere, especially Antarctica. We present temperature data a 300 m borehole at West Antarctic Sheet (WAIS) Divide. Results show that WAIS Divide colder than 1000‐year average 1300 to 1800 C.E. time period 1400–1800 on 0.52 ± 0.28°C 100‐year average. This amplitude half seen Greenland Summit (GRIP). result...
Ocean surface winds, currents, and waves play a crucial role in exchanges of momentum, energy, heat, freshwater, gases, other tracers between the ocean, atmosphere, ice. Despite being strongly coupled to upper ocean circulation overlying efforts improve atmospheric, wave observations models have evolved somewhat independently. From an observational point view, community bridge this gap led proposals for satellite Doppler oceanography mission concepts, which could provide unprecedented...
Abstract California experienced a historic run of nine consecutive landfalling atmospheric rivers (ARs) in three weeks’ time during winter 2022/23. Following years drought from 2020 to 2022, intense ARs across December 2022–January 2023 were responsible for bringing reservoirs back historical averages and producing damaging floods debris flows. In recent years, the Center Western Weather Water Extremes collaborating institutions have developed routinely provided end users peer-reviewed...
Broadband acoustic signals were transmitted during November 1994 from a 75-Hz source suspended near the depth of sound-channel axis to 700-m long vertical receiving array approximately 3250 km distant in eastern North Pacific Ocean. The early part arrival pattern consists raylike wave fronts that are resolvable, identifiable, and stable. later does not contain identifiable arrivals, due scattering internal-wave-induced sound-speed fluctuations. observed ray travel times differ predictions...
Abstract An estimate of the time-varying global ocean circulation for period 1992–2002 was obtained by combining most World Ocean Circulation Experiment (WOCE) datasets with a general model on 1° horizontal grid. The exactly satisfies equations without artificial sources or sinks momentum, heat, and freshwater. To bring into agreement observations, its initial temperature salinity conditions were permitted to change, as time-dependent surface fluxes estimation these “control variables” is...
Long-range acoustic transmissions made in conjunction with extensive environmental measurements and accurate mooring position determinations have been used to test the accuracy of equations calculate sound speed from pressure, temperature, salinity. The sound-speed fields computed using Del Grosso equation [V. A. Grosso, J. Acoust. Soc. Am. 56, 1084–1091 (1974)] give predictions arrival patterns which agree significantly better long-range than those Chen Millero [C. F. Millero, 62, 1129–1135...
signals with phase speeds of O(10) and O(100 to 300) km day −1 time scales 2 3 weeks. The slow speed are only observed in southern California. It is hypothesized that they scattered reflected by shoreline curvature bathymetry change do not penetrate north Point Conception. seasonal transition alongshore surfacecirculationforcedbyupwelling‐favorablewindsandtheirrelaxationiscapturedinfine detail.Submesoscaleeddies,identifiedusingflowgeometry,haveRossbynumbersof0.1to3, diameters the range 10 60...
Abstract Circulation in the Gulf of Mexico (GoM) is dominated by Loop Current (LC) and eddies (LCEs) that form at irregular multimonth intervals separation from LC. Comparatively small cyclonic (CEs) are thought to have a controlling influence on LCE, including its Because CEs so dynamic short-lived, lasting only few weeks, they proved challenge observe. This study addresses using underwater gliders. These gliders’ data satellite sea surface height (SSH) used four-dimensional variational...
Abstract The Red Sea, home to the second-longest coral reef system in world, is a vital resource for Kingdom of Saudi Arabia. Sea provides 90% Kingdom’s potable water by desalinization, supporting tourism, shipping, aquaculture, and fishing industries, which together contribute about 10%–20% country’s GDP. All these activities, those elsewhere region, critically depend on oceanic atmospheric conditions. At time mega-development projects along coast, global warming, authorities are working...
Abstract Tides and Earth‐Moon system evolution are coupled over geological time. Tidal energy dissipation on Earth slows rotation rate, increases obliquity, lunar orbit semi‐major axis eccentricity, decreases inclination. core‐mantle boundary within the Moon decrease inclination, eccentricity axis. Here we integrate backwards for 4.5 Ga with orbital dynamics explicit ocean tide models that “high‐level” (i.e., not idealized). To account uncertain plate tectonic histories, employ Monte Carlo...
A field test of ocean acoustic tomography was conducted in 1981 for a two month period 300 km square at 26°N, 70°W the North Atlantic (just south MODE region). Nine deep-sea moorings with sea floor transponders automated position keeping and provisions precise time were set recovered. From measured travel times between moorings, various displays three-dimensional sound speed (closely related to temperature) have been obtained by inversion procedures. These procedures use historical data as...
An optimal interpolation (OI) method to compute surface vector current fields from radial velocity measurements derived high‐frequency (HF) radars is presented. The assumes a smooth spatial covariance relationship between neighboring currents, in contrast the more commonly used un‐weighted least‐squares fitting (UWLS) method, which constant within defined search radius. This OI can directly any quantities linearly related velocities, such as currents and dynamic (divergence vorticity) well...
The trajectories of the 17 profiling floats deployed by OKMC program.
Abstract Simulated along-track ocean altimetry data were used to implement the use of a nonlinear dynamic propagator perform three-dimensional (time and 2D space) interpolation mesoscale sea surface height (SSH). The method is an inverse approach processing unevenly sampled in time space into high-level gridded maps. approach, similar standard objective mapping, contains some correction terms innovation vectors account for dynamics. Another key improvement solve covariance functions through...