A5064196968- Oceanographic and Atmospheric Processes
- Ocean Waves and Remote Sensing
- Marine and coastal ecosystems
- Coastal and Marine Dynamics
- Tropical and Extratropical Cyclones Research
- Climate variability and models
- Geology and Paleoclimatology Research
- Underwater Acoustics Research
- Methane Hydrates and Related Phenomena
- Marine and fisheries research
- Geological formations and processes
- Coastal wetland ecosystem dynamics
- Atmospheric and Environmental Gas Dynamics
- Maritime Navigation and Safety
- Solar and Space Plasma Dynamics
- Aeolian processes and effects
- Ocean Acidification Effects and Responses
- Crustacean biology and ecology
- Aquaculture Nutrition and Growth
- Marine Biology and Ecology Research
- Earthquake Detection and Analysis
- Meteorological Phenomena and Simulations
- Ionosphere and magnetosphere dynamics
- Arctic and Antarctic ice dynamics
- Reservoir Engineering and Simulation Methods
University of North Carolina Wilmington
2021-2025
University of Otago
2018-2023
Naval Postgraduate School
2020
University of Washington
2020
Scripps Institution of Oceanography
2014-2019
University of California, San Diego
2015-2017
Oregon State University
2009-2014
Abstract Transient rip currents, episodic offshore flows from the surf zone to inner shelf, present a recreational beach hazard and exchange material across nearshore ocean. The magnitude extent of transient rip‐current‐induced its relative importance other shelf processes are poorly understood. Here 120 model simulations with random, normally incident, directionally spread waves spanning range slopes wave conditions show that current velocity is self‐similar. nondimensional velocity,...
Using ancillary datasets and interpolation schemes, 20+ years of the Munida Time Series (MTS) observations were used to evaluate seasonal decadal variability in regional carbon cycle off southeast coast New Zealand. The contributions gas exchange, surface freshwater flux, physical transport processes biological productivity mixed layer diagnostically assessed using a mass-balanced ocean model. interannual this region is dominated by horizontal advection water with higher dissolved inorganic...
Abstract Transient rip currents drive cross‐shore transport of nutrients, larvae, sediment, and other particulate matter. These are driven by short‐crested wave breaking, which is associated with rotational wave‐breaking forces (vorticity forcing) that generate horizontal motions (eddies) at small scales. Energy from small‐scale eddies transferred to larger‐scale interact enhance exchange. Previous numerical modeling work on planar beaches has shown exchange increases increasing directional...
Abstract Using an ocean reanalysis and freely evolving numerical simulation, eddy‐driven cross‐shelf exchange in the East Auckland Current (EAuC) system was investigated. The EAuC is stronger than free run has a more evident impact on exchange. Despite differences strength, both simulations produced similar small‐eddy (radius 30 km) statistics, which supports robustness of considering that data assimilation could generate unrealistic variability. These 1‐year revealed mechanisms by its eddy...
Abstract Moored observations of temperature and current were collected on the inner continental shelf off Point Sal, California, between 9 June 8 August 2015. The measurements consist 10 moorings in total: 4 each 50- 30-m isobaths covering a 10-km along-shelf distance an across-shelf section 50-, 40-, 30-, 20-m 5-km distance. Energetic, highly variable, strongly dissipating transient wave events termed internal tide bores solitary waves (ISWs) dominate records. Simple models bore ISW...
In this study, a high-resolution one-way nested, hindcast ROMS model was developed to analyse the coastal circulation and Lagrangian statistics within Bay of Plenty (BoP) region in Aotearoa, New Zealand. The Model (BoPM) statistically evaluated against set multiple remote sensing situ observations from 2003-2004, forming analysis period for study. Overall, BoPM possesses good skill reproducing ocean water temperature, salinity, sea level column velocity over tidal non-tidal timescales...
Abstract. Here we present the first open-access long-term 3D hydrodynamic ocean hindcast for New Zealand estate. The 28-year 5 km×5 km resolution free-running model configuration was developed under umbrella of Moana Project, using Regional Ocean Modeling System (ROMS) version 3.9. It includes an improved bathymetry, spectral tidal forcing at boundaries and inverse-barometer effect usually absent from global simulations. continuous integration provides a framework to improve our...
Abstract The effects of barotropic and baroclinic tides on subtidal stratification vertical mixing are examined with high‐resolution, three‐dimensional numerical simulations the Central Californian coastal upwelling region. A base simulation realistic atmospheric regional‐scale boundary forcing but no (NT) is compared to two addition predominantly local (LT) combined remotely generated, (WT) 100 onshore energy flux. During a 10 day period when domain volume‐averaged temperature similar in...
Abstract A series of five realistic, nested, hydrostatic numerical ocean model simulations are used to study semidiurnal internal tide generation and propagation from the continental slope, through shelf break midshelf adjacent Point Sal, CA. The statistics modeled temperature horizontal velocity fluctuations compared observations (30‐ 50‐m water depth). Time‐ frequency‐domain methods decompose tides into components that coherent incoherent with barotropic tide, incoherence fraction is...
Abstract Accurately representing diurnal and semidiurnal internal variability is necessary to investigate inner-shelf midshelf exchange processes. Here, a coupled Regional Ocean Model System (ROMS)–Simulating Waves Nearshore (SWAN) model compared observed tidal on the mid inner shelf (26–8 m water depth) near San Pedro Bay, California. Modeled mean stratification about one-half of that observed. baroclinic velocity rotary spectra are similar in band. temperature have band structure, although...
Abstract In upwelling regions, wind relaxations lead to poleward propagating warm water plumes that are important coastal ecosystems. The ocean response relaxation around Pt. Conception, CA is simulated with a Regional Ocean Model (ROMS) forced by realistic surface and lateral boundary conditions including tidal processes. model reproduces well the statistics of observed subtidal column temperature velocity at both outer inner‐shelf mooring locations throughout study. A poleward‐propagating...
New Zealand (NZ) is an island nation with stewardship of ocean twenty times larger than its land area. While the challenges facing NZ's are similar to other maritime countries, no coherent national plan exists that meets needs scientists, stakeholders or kaitiakitanga (guardianship) in a changing climate. The NZ marine science community will use OceanObs'19 white paper establish framework and implementation for collaborative observing system (NZ-OOS). Co-production knowledge Māori be...
Abstract The inner shelf, the transition zone between surfzone and midshelf, is a dynamically complex region with evolution of circulation stratification driven by multiple physical processes. Cross-shelf exchange through shelf has important implications for coastal water quality, ecological connectivity, lateral movement sediment heat. Inner-Shelf Dynamics Experiment (ISDE) was an intensive, coordinated, multi-institution field experiment from September–October 2017, conducted into near...
Abstract. Here we present the first open access long term 3D hydrodynamic ocean hindcast for New Zealand estate. The 28 years 5 km x resolution free running model configuration was developed under umbrella of Moana Project, using Regional Ocean Model System (ROMS) version 3.9. It includes an improved bathymetry, spectral tidal forcing at boundaries, and inverse barometer effect usually absent from global simulations. continuous integration provides a framework to improve our understanding...
Abstract American lobster (Homarus americanus) have a thick calcified cuticle, and do not exhibit rapid colour changes characteristic of other crustaceans. Thus, the plasticity their coloration has been largely overlooked. Colour in lobsters is determined by amount, location, form carotenoid pigment astaxanthin, it possible for to alter changing one these characteristics astaxanthin deposition. Here, short‐term variation response environmental cues (background ultraviolet (UV) light) was...
Abstract Shore-based video remote sensing is used to observe and continually monitor nonlinear internal waves propagating across the inner shelf. Month-long measurements of velocity from bottom-mounted acoustic Doppler current profilers temperature thermistor chains at 10- 20-m isobaths are combined with sea surface imagery a suite cameras (Argus) provide kinematic description 11 borelike as they propagate central Oregon The expression these waves, commonly seen by eye alternating rough...
Abstract The effects of barotropic and baroclinic tides on three‐dimensional (3‐D) coastal dispersion are examined with realistic, 200‐m horizontal resolution simulations the Central Californian continental shelf during upwelling. Over multiple tidal cycles, relative vertical 3‐D drifters similar between no tides. In contrast, tides, which dissipate across induce mixing, result in a factor 2–3 times larger dispersion. increase mixing is qualitatively consistent weak‐mixing shear Without...
Abstract Semidiurnal velocity and density oscillations are examined over the mid- inner continental shelf near Heceta Bank on Oregon coast. Measurements from two long-term observation networks with sites off submarine bank reveal that both baroclinic velocities displacements dominated by first mode, larger midshelf northern parts of bank. Midshelf have current ellipses theoretical value for single, progressive internal tidal waves compared to more linearly polarized currents shelf....
The near-ubiquitous presence of freshwater over the inner to mid-continental shelf off Otago Peninsula in southeast Aotearoa/New Zealand has been previously identified long-term cross-shelf transects. Occasional influxes this silicate-rich neritic water past break and beyond Subtropical Front have observed, potentially supporting elevated chlorophyll-a concentrations SubAntarctic waters. Nearshore salinity variability connected flow rates Clutha River, Aotearoa's largest river by discharge,...
[1] In the summer of 2007, physical measurements including velocity from acoustic Doppler current profilers, surface gravity wave heights measured acoustically, and temperature thermistor chain arrays were collected along- across- mid to inner shelf (water depths 10–60 m) in northern Monterey Bay. The oceanic response a strong (8–15 m s−1 daily maximum) along-shelf sea breeze is examined by evaluating diurnal heat budget over cross-shelf section shelf. closes within 95% confidence level with...
Abstract In various oceanic regions, drifter-derived diffusivities reach a temporal maximum and subsequently decrease. Often, these are regions of inhomogeneous eddies, however, the effect turbulence on dispersion is poorly understood. The nearshore region (spanning from surfzone to inner shelf) also has strong cross-shore turbulence. Nearshore Lagrangian statistics estimated drifter trajectories simulated with wave-resolving two-dimensional Boussinesq model random, normally incident,...
Abstract This study investigates the influence of along‐front wind forcing on chlorophyll‐a (Chl‐a) at Otago Shelf Break (OSB) in southeast Aotearoa/New Zealand using remotely‐sensed and situ data. Summer stress over OSB was shelf‐aligned, oscillating between upfront downfront. Surface Chl‐a concentrations along were shown to increase episodically (≤10 days duration) following stress. response occurred most 350 km long shelf break, intense north Peninsula. Peak enhancement break periods...
Abstract. This study analyses data assimilative numerical simulations in an eddy-dominated western boundary current: the East Auckland Current (EAuC). The goal is to assess impact of assimilating surface and subsurface into a model EAuC via running observing system experiments (OSEs). We used Regional Ocean Modeling System (ROMS) conjunction with 4-dimensional variational (4D-Var) assimilation scheme incorporate sea height (SSH) temperature (SST), as well temperature, salinity velocity from...