A5068194004- Oceanographic and Atmospheric Processes
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
- Climate variability and models
- Marine and coastal ecosystems
- Geology and Paleoclimatology Research
- Geological formations and processes
- Coastal and Marine Dynamics
- Marine and fisheries research
- Ocean Acidification Effects and Responses
- Underwater Acoustics Research
- Reservoir Engineering and Simulation Methods
- Methane Hydrates and Related Phenomena
- Coastal wetland ecosystem dynamics
- Seismic Imaging and Inversion Techniques
- Meteorological Phenomena and Simulations
- Geological and Geophysical Studies
- Geophysics and Gravity Measurements
- Marine Biology and Ecology Research
- Geological Studies and Exploration
- Food Industry and Aquatic Biology
- Arctic and Antarctic ice dynamics
- Underwater Vehicles and Communication Systems
- Adventure Sports and Sensation Seeking
- Coastal and Marine Management
Scripps Institution of Oceanography
2016-2025
University of California, San Diego
2015-2025
University of Minnesota, Duluth
2020
Oceanography Society
2016
Max Planck Institute for Molecular Biomedicine
2014
University of Florida
2009-2013
University of Manchester
2010
University of British Columbia
2009
Abstract The authors present inferences of diapycnal diffusivity from a compilation over 5200 microstructure profiles. As observations are sparse, these supplemented with indirect measurements mixing obtained (i) Thorpe-scale overturns moored profilers, finescale parameterization applied to (ii) shipboard upper-ocean shear, (iii) strain as measured by profiling floats, and (iv) shear full-depth lowered acoustic Doppler current profilers (LADCP) CTD Vertical profiles the turbulent dissipation...
The Argo Program has been implemented and sustained for almost two decades, as a global array of about 4000 profiling floats. provides continuous observations ocean temperature salinity versus pressure, from the sea surface to 2000 dbar. successful installation its innovative data management system arose opportunistically combination great scientific need technological innovation. Through system, fundamental physical with broad societally-valuable applications, built on cost-efficient robust...
Diapycnal mixing plays a primary role in the thermodynamic balance of ocean and, consequently, oceanic heat and carbon uptake storage. Though observed rates are on average consistent with values required by inverse models, recent attention has focused dramatic spatial variability, spanning several orders magnitude, both upper deep ocean. Away from boundaries, spatio-temporal patterns largely driven geography generation, propagation dissipation internal waves, which supply much power for...
Abstract Turbulent mixing in the ocean is key to regulate transport of heat, freshwater and biogeochemical tracers, with strong implications for Earth’s climate. In deep ocean, tides supply much mechanical energy required sustain via generation internal waves, known as tides, whose fate—the relative importance their local versus remote breaking into turbulence—remains uncertain. Here, we combine a semi-analytical model tide satellite situ measurements show that from an energetic viewpoint,...
Abstract Vertical mixing is often regarded as the Achilles' heel of ocean models. In particular, few models include a comprehensive and energy‐constrained parameterization by internal tides. Here, we present an energy‐conserving scheme which accounts for local breaking high‐mode tides distant dissipation low‐mode The relies on four static two‐dimensional maps tide dissipation, constructed using mode‐by‐mode Lagrangian tracking energy beams from sources to sinks. Each map associated with...
Abstract Finescale methods are currently being applied to estimate the mean turbulent dissipation rate and diffusivity on regional global scales. This study evaluates finescale estimates derived from isopycnal strain by comparing them with average microstructure profiles six diverse environments including equator, above ridges, near seamounts, in strong currents. The at least 10 nearby Argo (generally <60 km distant) no temporal restrictions, measurements separated seasons or decades....
Velocity and hydrography measurements were used to determine the tidal variability detailed structure of an intense (~ 43,200 m 3 d −1 ) point‐source submarine groundwater discharge from a spring located in coastal ocean Yucatán peninsula, Mexico. Measurements obtained during dry season with combination towed, profiling, fixed instrumentation. The goal these observations was understand effects tides on velocity salinity water column that mixing dispersion processes at spatial scales meters...
Abstract Air–Sea Interactions in the Northern Indian Ocean (ASIRI) is an international research effort (2013–17) aimed at understanding and quantifying coupled atmosphere–ocean dynamics of Bay Bengal (BoB) with relevance to monsoons. Working collaboratively, more than 20 institutions are acquiring field observations operational high-resolution models address scientific issues that have stymied monsoon predictability. ASIRI combines new mature observational technologies resolve submesoscale...
The semidiurnal mode‐1 internal tide receives 0.1–0.3 TW from the surface and is capable of propagating across ocean basins. ultimate fate energy after long‐distance propagation poorly constrained by existing observations numerical simulations. Here, global results a two‐dimensional semi‐analytical model indicate that topographic scattering inefficient at most locations deeper than 2500 m. Next, one‐dimensional linear with realistic topography stratification create map coefficients along...
Abstract Observations from Eel Canyon, located on the north coast of California, show that elevated turbulence in full water column arises convergence remotely generated internal wave energy. The incoming semidiurnal and bottom-trapped diurnal tides generate complex interference patterns. tide sets up a partly standing within canyon due to reflection at head, dissipating all its energy canyon. Dissipation near bottom is associated with trapped tide, while midwater isopycnal shear strain...
Abstract Lateral submesoscale processes and their influence on vertical stratification at shallow salinity fronts in the central Bay of Bengal during winter monsoon are explored using high-resolution data from a cruise November 2013. The observations radiator survey centered salinity-controlled density front, embedded zone moderate mesoscale strain (0.15 times Coriolis parameter) forced by winds with downfront orientation. Below thin mixed layer, often ≤10 m, analysis shows several dynamical...
Abstract We present observations of shoaling nonlinear internal bores off the coast central California. The dataset includes 15 moorings deployed during September–October 2017 and cross-shore shipboard surveys. describe structure evolution large-amplitude as they transit from 9 km (100-m depth) to 1 offshore (10 m). observe that two arrive each semidiurnal period, both propagating southwest; total, 72% are tracked 10-m isobath. bore speeds subtidally modulated, but there is additional...
An 18-month deployment of moored sensors in Iceland Basin allows characterization near-inertial (frequencies near the Coriolis frequency f with periods ~14 h) internal gravity wave generation and propagation a region an active mesoscale eddy field strong seasonal wind heat forcing. The cycle surface forcing deepens mixed layer winter controls excitation near-inertial energy. modulates temporal, horizontal, vertical scales, as well out into deep permanent pycnocline. Wind-forced energy has...
contributing to seasonal and longerterm storage, transport, vertical mixing of heat, both in exchange with the atmosphere melting sea ice.Though different latitude temperature, Arctic Ocean Bay
Abstract The potential influences of turbulence on planktonic processes such as nutrient uptake, grazing, predation, infection, and mating have been explored in hundreds laboratory theoretical studies. However, the levels used may not represent those experienced by oceanic plankton, bringing into question their relevance for understanding dynamics ocean. Here, we take a data‐centric approach to understand climate plankton ocean, analyzing over one million measurements acquired open Median...
Abstract The propagation characteristics of near‐inertial waves (NIWs) and how mesoscale submesoscale processes affect the waves' vertical penetration are investigated using observations from a mooring array located in northeast Atlantic. year‐long show that motions mainly generated by local wind forcing, they radiate equatorward downward following several strong events (wind stress ≳0.5 N m −2 ). Observational estimates horizontal group speed typically exceed those two orders magnitude,...
K5 lyase A (KflA) is a tail spike protein (TSP) encoded by K5A coliphage, which cleaves capsular polysaccharide, glycosaminoglycan with the repeat unit [-4)-betaGlcA-(1,4)- alphaGlcNAc(1-], displayed on surface of Escherichia coli strains. The crystal structure KflA reveals trimeric arrangement, each monomer containing right-handed, single-stranded parallel beta-helix domain. Stable trimer formation intertwining strands in C-terminal domain, followed proteolytic maturation, likely to be...
By studying how underwater waves strike the continental slope off Tasmania, researchers seek to uncover mechanisms that keep circulation of global ocean in balance.
Abstract Internal tides, generated by barotropic tides flowing over rough topography, are a primary source of energy into the internal wave field. As propagate away from generation sites, they can dephase equilibrium tide, becoming nonstationary. Here, we examine how low-frequency quasigeostrophic background flows scatter and in Tasman Sea. We demonstrate that semi-idealized tide model [the Coupled-Mode Shallow Water (CSW)] must include two flow effects to replicate situ fluxes observed...
A reduced-physics model is employed at 1/25° to 1/100° global resolution determine (a) if linear dynamics can reproduce the observed low-mode M2 internal tide, (b) internal-tide sensitivity bathymetry, stratification, surface tides, and dissipation parameterizations, (c) amount of power transferred nonstationary tide. The simulations predict 200 GW mode-1 generation, consistent with a general circulation semianalytical theory. Mode-1 energy sensitive damping, but simulation using...
Abstract In the Bay of Bengal, warm, dry boreal spring concludes with onset summer monsoon and accompanying southwesterly winds, heavy rains, variable air–sea fluxes. Here, we summarize 2018 using observations collected through multinational Monsoon Intraseasonal Oscillations in Bengal (MISO-BoB) program between United States, India, Sri Lanka. MISO-BoB aims to improve understanding intraseasonal variability, field effort captured coupled response during a transition from active-to-break...
Abstract In situ observations of tidally driven turbulence were obtained in a small channel that transects the crest Mendocino Ridge, site mixed (diurnal and semidiurnal) tides. Diurnal tides are subinertial at this latitude, once per day trapped tide leads to large flows through giving rise tidal excursion lengths comparable width ridge crest. During these times, energetic is observed channel, with overturns spanning almost half full water depth. A high-resolution, nonhydrostatic,...