A5019389307- Oceanographic and Atmospheric Processes
- Marine and coastal ecosystems
- Tropical and Extratropical Cyclones Research
- Ocean Waves and Remote Sensing
- Climate variability and models
- Marine and fisheries research
- Underwater Acoustics Research
- Geology and Paleoclimatology Research
- Oil Spill Detection and Mitigation
- Marine Biology and Ecology Research
- Meteorological Phenomena and Simulations
- Coastal and Marine Dynamics
- Underwater Vehicles and Communication Systems
- Atmospheric and Environmental Gas Dynamics
- Ocean Acidification Effects and Responses
- Methane Hydrates and Related Phenomena
- Marine Toxins and Detection Methods
- Geophysics and Gravity Measurements
- Marine and environmental studies
- Global Energy and Sustainability Research
- Coastal and Marine Management
- Geological formations and processes
- Geological Studies and Exploration
- Environmental Monitoring and Data Management
- Isotope Analysis in Ecology
University of South Florida St. Petersburg
2014-2024
College of Marin
2014-2024
University of South Florida
2009-2023
Florida College
2007-2023
Stanford University
2018
State University System of Florida
2008
University of Miami
2000-2007
Scripps Institution of Oceanography
2007
University of California, San Diego
2007
U.S. National Science Foundation
2005
Abstract This paper addresses a bias problem in the estimate of wavelet power spectra for atmospheric and oceanic datasets. For time series comprised sine waves with same amplitude at different frequencies conventionally adopted method does not produce spectrum identical peaks, contrast to Fourier analysis. The this definition, that is, transform coefficient squared (to within constant factor), is equivalent integration energy (in physical space) over influence period (time scale) spans....
Abstract : The main objective is to use the HYbrid Coordinate Ocean Model (HYCOM) with data assimilation in an eddy-resolving, fully global ocean prediction system transition Naval Oceanographic Office (NAVOCEANO) at .08 deg equatorial (~7 km mid-latitude) resolution 2007 and .04 by 2011. model will include shallow water a minimum depth of 5 m provide boundary conditions finer coastal regional models that may HYCOM or different model. In addition, be coupled atmospheric, ice bio-chemical...
Independent data from the Gulf of Mexico are used to develop and test hypothesis that same sequence physical ecological events each year allows toxic dinoflagellate Karenia brevis become dominant. A phosphorus‐rich nutrient supply initiates phytoplankton succession, once deposition Saharan iron‐rich dust allow Trichodesmium blooms utilize ubiquitous dissolved nitrogen gas within otherwise nitrogen‐poor sea water. They co‐occurring K. positioned bottom Ekman layers, as a consequence their...
Despite its wide applications as a tool for feature extraction, the Self‐Organizing Map (SOM) remains black box to most meteorologists and oceanographers. This paper evaluates extraction performance of SOM by using artificial data representative known patterns. The is shown extract patterns linear progressive sine wave. Sensitivity studies are performed ascertain effects tunable parameters. By adding random noise wave data, it demonstrated that extracts essential from noisy data. Moreover,...
A data‐based hypothesis is presented on the mechanism of El Niño‐Southern Oscillation (ENSO), a major determinant interannual global climate variability. The emphasizes importance off‐equator sea surface temperature and level pressure variations west dateline for initiating equatorial easterly winds over far western Pacific. These compete with westerly central Pacific enabling coupled ocean‐atmosphere system to oscillate. Consistent this hypothesis, an analogical oscillator model constructed...
Previous hypotheses had suggested that upwelled intrusions of nutrient‐rich Gulf Mexico slope water onto the West Florida Shelf (WFS) led to formation red tides Karenia brevis . However, coupled biophysical models (1) wind‐ and buoyancy‐driven circulation, (2) three phytoplankton groups (diatoms, K. , microflagellates), (3) these supplies nitrate silicate, (4) selective grazing stress by copepods protozoans found diatoms won in one 1998 case no light limitation colored dissolved organic...
Observations of sea surface temperature (SST), level pressure (SLP), wind, and outgoing longwave radiation (OLR) show that the El Niño‐Southern Oscillation (ENSO) displays western Pacific anomaly patterns in addition to eastern patterns. During warm phase ENSO, SST low SLP anomalies equatorial OLR central are accompanied by cold high off‐equatorial far Pacific. Also, while zonal wind over westerly, those easterly. The nearly out‐of‐phase behavior between tropical is also observed during but...
Patterns of ocean current variability are examined on the West Florida Shelf by a neural network analysis based self‐organizing map (SOM), using time series moored velocity data that span interval October 1998–September 2001. Three characteristic spatial patterns extracted in 3 × 4 SOM array: spatially coherent southeastward and northwestward flow with strong currents transition pattern weak currents. On synoptic weather timescale variations these local winds. seasonal both winds...
[1] The Lagrangian separation distance between the endpoints of simulated and observed drifter trajectories is often used to assess performance numerical particle trajectory models. However, fails indicate relative model in weak strong current regions, such as a continental shelf its adjacent deep ocean. A new skill score proposed based on cumulative distances normalized by associated lengths. This evaluate surface implied Global HYCOM hindcast currents gauged against actual...
An empirical orthogonal function–based technique called Data Interpolating Empirical Orthogonal Functions (DINEOF) is used in a multivariate approach to reconstruct missing data. Sea surface temperature (SST), chlorophyll concentration, and QuikSCAT winds are assess the benefit of reconstruction. In particular, combination SST plus chlorophyll, lagged have been studied. To quality reconstructions, reconstructed compared situ The as well significantly improves results obtained by...
The Deepwater Horizon oil spill was caused by a drilling rig explosion on 20 April 2010 that killed 11 people. It the largest in U.S. history and presented an unprecedented threat to Gulf of Mexico marine resources. Although gushing surface diminished after well capped, 15 July 2010, much remains be known about dispersants beneath surface, including their trajectories effects life. A system for tracking oil, both at depth, needed mitigation efforts ship survey guidance. Such implemented...
Abstract The surface circulation of the Caribbean Sea and Gulf Mexico is studied using 13 years satellite altimetry data. Variability in evident over several time scales. At annual scale, sea height (SSH) varies mainly by a seasonal steric effect. Interannually, longer cycle affects SSH slope across current hence intensity Current. This found to be related changes wind intensity, stress curl, El Niño–Southern Oscillation. shorter scales, eddies meanders are observed Current, their...
Assessment of direct and indirect impacts oil dispersants on the marine ecosystem in northeastern Gulf Mexico (NEGOM) from Deepwater Horizon spill (April – July 2010) requires sustained observations over multiple years. Here, using satellite measurements, numerical circulation models, other environmental data, we present some initial results observed biological changes at base food web. MODIS fluorescence line height (FLH, a proxy for phytoplankton biomass) shows two interesting anomalies....
Abstract Concurrently operated on the West Florida shelf for purpose of observing surface currents are three long-range (4.9 MHz) Coastal Ocean Dynamics Applications Radar (CODAR) SeaSonde and two median-range (12.7 Wellen (WERA) high-frequency (HF) radar systems. These HF radars overlook an array moored acoustic Doppler current profilers (ADCPs), which presently within footprint. Analyzed herein 3 months simultaneous observations. Both WERA systems generally agree with ADCPs to...
Abstract Blooms of the harmful alga, Karenia brevis on west Florida continental shelf are thought to initiate offshore before manifesting as a nuisance along coastline. Contributing such blooms complex sequence events occurring within oligotrophic waters, which in any given year may or not be facilitated by ocean circulation. Once initiation occurs, delivery from region origination coastline manifestation requires an upwelling circulation, whereby K . cells advected shoreward bottom. The...
The kinematics of planetary waves originating from instability the nearsurface equatorial currents are reported on using velocity measurements an array acoustic Doppler current profilers deployed in Pacific during Tropical Instability Wave Experiment. A distinctive wave season was observed August to December 1990, with energy confined primarily above core Equatorial Undercurrent. Particle motions horizontal plane described by eccentric ellipses oriented toward north, but tilting into...
The circulation of Tampa Bay is investigated using a high‐resolution, three‐dimensional, density‐dependent, finite volume coastal ocean model (FVCOM) that includes Bay, the intracoastal waterway, and inner portion west Florida continental shelf. Model performance over three‐month interval, September to November 2001, assessed against available tide gauge velocity profiler data before describe as driven by rivers, tides, winds. Because mean wind vector directed down estuary axis, we ran...
Material property distributions on continental shelves result from the mixing and modifications of estuarine deep‐ocean source waters. How this occurs depends momentum buoyancy that are input either locally shelf or at break. We address question local versus forcing for West Florida Shelf (WFS) using in situ data a numerical circulation model. The spring summer seasons 1998 1999 show distinctively different water properties account these differences by combination forcing, independent...
Evidence is presented for the generation of planetary waves by barotropic instability within cyclonic shear region Atlantic Ocean's South Equatorial Current (SEC). Immediately following springtime intensification southeast trade wind, which accelerates SEC westward, a packet with central periodicity around 25 days observed lasting about three cycles. Independent wavenumber analyses on 1983 and 1984 data give newly identical zonal wavelengths phase speed estimates 1100 km −50 cm s−1. The are...
We provide a dynamics‐based comparison on the results from three‐dimensional and two‐dimensional simulations of hurricane storm surge. begin with question, What may have occurred in Tampa Bay, Florida vicinity had Hurricane Ivan made landfall there instead at border between Alabama Florida? This question is explored using three‐dimensional, primitive equation, finite volume coastal ocean model. The show that surges are potentially disastrous for Bay area, especially landfalls located to...
Atmospherically driven flow in the Providence River (a partially mixed estuary) has been examined using a 51-day velocity record measured 2 m from bottom. Velocity fluctuations at time scales between steady-state gravitational convection and tidal oscillations were large almost exclusively wind-induced. The mean variance of component lying along channel axis 11.7 cm s−1 (landward) 166.9 cm2 s−2. Of this axial current 48% resided subtidal frequencies as compared to 45% associated with...
Narragansett Bay is a weakly stratified estuary comprised of three connecting passages varying depths. The vertical distribution horizontal velocity was observed in the West Passage using moored current meters. instantaneous motion characterized by semi-diurnal tidal currents amplitude 25–60 cm s−1. These exhibited phase advance with depth (total water depth=12.8 m) ranging lunar from 0–3 h. net time series obtained filtering out motions at and higher frequencies were found to be an order...