A5060373893- Oceanographic and Atmospheric Processes
- Coastal and Marine Dynamics
- Marine and coastal ecosystems
- Tropical and Extratropical Cyclones Research
- Coastal wetland ecosystem dynamics
- Ocean Waves and Remote Sensing
- Coral and Marine Ecosystems Studies
- Marine and fisheries research
- Ocean Acidification Effects and Responses
- Climate variability and models
- Coastal and Marine Management
- Geological formations and processes
- Aeolian processes and effects
- Arctic and Antarctic ice dynamics
- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Water Quality Monitoring and Analysis
- Flood Risk Assessment and Management
- Advanced Algorithms and Applications
- Sensor Technology and Measurement Systems
- Marine Bivalve and Aquaculture Studies
- Underwater Vehicles and Communication Systems
- Underwater Acoustics Research
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring Technologies
University of California, San Diego
2016-2025
Scripps Institution of Oceanography
2014-2025
Ecological Society of America
2018
John Wiley & Sons (United States)
2018
University of Washington
2011-2013
Mechanics' Institute
2011
Stanford University
2008-2011
University of California, Berkeley
2005
Emissions from gasoline and diesel engines vary on time scales including diurnal, weekly, decadal. Temporal patterns differ for these two engine types that are used predominantly passenger travel goods movement, respectively. Rapid growth in fuel use decreasing NOx emission rates have led to altered profiles. During the 1990s, on-road of grew 3 times faster than gasoline. Over same period, rate California was reduced by a factor approximately 2, while decreased only slightly. Diesel...
Abstract A realistic numerical model is used to study the circulation and mixing of Salish Sea, a large, complex estuarine system on United States Canadian west coast. The Sea biologically productive supports many important fisheries but threatened by recurrent hypoxia ocean acidification, so clear understanding its patterns residence times value. exchange flow quantified at 39 sections over 3 years (2017–2019) using Total Exchange Flow method. Vertical in 37 segments between as opposing...
Abstract The coastal waters of the northern portion California Current System experience a seasonal decline in oxygen concentrations and hypoxia over summer upwelling season that results negative impacts on habitat for many organisms. Using regional model extending from 43°N to 50°N, with an component developed this study, drivers variability are identified. includes two pools detritus, which was essential addition order achieve good agreement observations. validated using extensive array...
Harmful algal blooms (HABs) pose a significant threat to human and marine organism health, negatively impact coastal economies around the world.An improved understanding of HAB formation transport is required improve forecasting skill.A realistic numerical simulation US Pacific Northwest region used investigate pathways from known hot spots, specifically for Pseudo-nitzschia (Pn), coast.We show that are seasonal, with Washington (WA) coast northern source (the Juan de Fuca Eddy) during...
Abstract The Pacific Northwest (PNW) shelf is the most biologically productive region in California Current System. A coupled physical‐biogeochemical model used to investigate influence of freshwater inputs on productivity PNW waters using realistic hindcasts and experiments that omit outflow from Columbia River Strait Juan de Fuca (outlet for Salish Sea estuary). Outflow represents a critical source nitrogen shelf‐accounting almost half primary Vancouver Island shelf, third Washington fifth...
Abstract Ocean acidification threatens many marine organisms, especially calcifiers. The only global‐scale solution to ocean remains rapid reduction in CO 2 emissions. Nevertheless, interest localized mitigation strategies has grown rapidly because of the recognized threat imposes on natural communities, including ones important humans. Protection seagrass meadows been considered as a possible approach for due their large standing stocks organic carbon and high productivity. Yet much work...
Abstract Estuarine exchange flow governs the interaction between oceans and estuaries thus plays a large role in their biogeochemical processes. This study investigates variability estuarine due to offshore oceanic conditions including upwelling/downwelling, presence of river plume (from neighboring estuary). We address these processes via numerical simulations at mouth Salish Sea, system Northeast Pacific. An analysis Total Exchange Flow indicates that during upwelling season, is fairly...
[1] A high-resolution three-dimensional numerical simulation is performed with the parallel, unstructured grid SUNTANS model to study spatiotemporal dynamics of turbulent mixing in a shallow, macrotidal salt wedge estuary that experiences periodic and strong stratification. Unresolved vertical parameterized k − kl closure scheme Canuto-A stability functions based on careful comparison multiple two-equation schemes via generic length scale approach. The predictions velocity, salinity,...
[1] A month of flow observations in the Snohomish River Estuary reveals complex intratidal and fortnightly stratification, mixing, dispersion dynamics this macrotidal, shallow, salt wedge estuary system. Both propagation concomitant straining density field dominate temporal spatial variations stratification leading to variability shear mixing that differs important ways from partially mixed estuaries. Bottom-generated turbulent kinetic energy production is enhanced during spring tides acts...
Abstract Dissolved oxygen (DO) is a critically important ecological variable, and the prevalence of marine hypoxia expected to increase due combined effects ocean warming eutrophication. Thermal stress can co‐occur with hypoxia, especially in tropical systems, exacerbate its effects. We examine physical processes that are regulating temperature inversions Bahía Almirante, semi‐enclosed embayment on Caribbean coast Panama. A 10‐yr record observations at 7 locations within Almirante reveals...
Abstract Rainfall in southern California is highly variable, with some fluctuations explainable by climate patterns. Resulting runoff and heightened streamflow from rain events introduces freshwater plumes into the coastal ocean. Here we use a 105-year daily sea surface salinity record collected at Scripps Pier La Jolla, to show that El Niño Southern Oscillation Pacific Decadal both have signatures salinity. Averaging freshest quantile of over each year’s winter season provides useful metric...
Timeseries observations of beach elevation change and wave runup from a tower-mounted stationary lidar are used to assess the skill (skill=1−NMSE, where NMSE is normalized mean square error) 2% exceedence (R2%) estimates (Stockdon et al., 2006) during four storm events at Duck, NC, USA. The parameterization requires specification foreshore slope, however slope generally unknown high energy events, pre-storm often as proxy. R2% hindcasts computed using observed time-varying static profile....
Abstract Saltwater intrusion (SWI) into coastal freshwater systems is a growing concern in the face of climate change‐driven sea level rise and hydrologic variability. contamination surface California Pajaro Valley exemplifies this concern, where water cannot be diverted for agriculture if it too saline. Closures at mouth River Lagoon, bar‐built estuary Valley, are associated with SWI. SWI driven by combination offshore climate, hydrodynamics, estuarine dynamics, inland hydrology,...
Abstract We use turbulent dissipation measurements from a small estuary to determine how and when infragravity (IG) waves (periods 25–250 s) increase turbulence due bottom friction. The frequency of IG leads larger wave boundary layer than for sea swell waves. Current methods predicting mean currents rely on observations in regions the water column where oscillating velocities either have logarithmic or depth‐uniform profile. develop new approach unsteady regime that combines quasi‐steady at...
Abstract Widespread erosion associated with energetic waves of the strong 2015–2016 El Niño on U.S. West Coast has been reported widely. However, Southern California was often sheltered from northerly approach direction offshore waves. The few large swells that reached were not synchronous highest tides. Although west coast‐wide tidal anomalies relatively in 2015–2016, California, total water levels (sum tides, anomalies, and wave superelevation) lower than during 1997–1998 Niño, comparable...
ABSTRACT The diversity of the marine cyanobacterium Synechococcus can be broadly separated into clades, with clade II typically present in warm oligotrophic water, and clades I IV found cooler coastal water. We amplicon sequence variants (ASVs) belonging to nutrient‐replete waters San Diego Bay (SDB). Using 16S rRNA gene, 18S gene internal transcribed spacer region sequencing, we analysed multiple locations SDB monthly for over a year, additional samples dating back 2015. community...
Abstract Small‐scale buoyant outflows have the potential to impact beach contamination, nutrient exchange, productivity, larval recruitment, and carbon chemistry in nearshore region where surface gravity waves influence momentum energy transport. This study aims understand dynamics leading fate structure of an idealized small‐scale outflow presence using a fully coupled 3‐D hydrodynamic spectral wave model. Wave‐current interactions significantly alter plume when compared hydrodynamics‐only...
The Arabian Sea circulation is forced by strong monsoonal winds and characterized vigorous seasonally reversing currents, extreme differences in sea surface salinity, localized substantial upwelling, widespread submesoscale thermohaline structures. Its complicated temperature patterns are important for the onset evolution of Asian monsoon. This article describes a program that aims to elucidate role upper-ocean processes atmospheric feedbacks setting properties region. wide range spatial...
Abstract Small low-inflow intermittently closed estuaries are common in Mediterranean climates worldwide; however, despite their important contributions to ecosystem services and coastal resilience, dynamics have been less well studied relative classical (i.e., deeper, persistent freshwater inflow) estuaries. It is known that infragravity wave propagation into these can induce strong currents closures lead stagnating flows declining water quality; how the estuarine circulation (tidal...
Abstract A method is presented for calculating a complete, numerically closed, mechanical energy budget in realistic simulation of circulation coastal–estuarine domain. The formulated terms the “local” available potential (APE; Holliday and McIntyre 1981). APE may be split up into two parts based on whether water parcel has been displaced or down relative to its rest depth. This decomposition clearly shows different signatures coastal upwelling (particles by wind) estuary mixing). Because...
Abstract An inner-shelf (IS) dye plume that formed following a 3.84-h early morning surfzone (SZ) release off of Imperial Beach, California, is analyzed with in situ and aerial remotely sensed observations. Midmorning, 5 h after start, the IS extended 800 m offshore (or ≈8 L sz , where width) was surface intensified. Over next ≈2 h, deformed (narrowed) cross-shore front progressing onshore at ≈5 cm s −1 deepened by up to 3 m, elongated alongshore ≈4.5 km (at ≈2.5 ). Coincident deformation...
In April and May of 2020, a large phytoplankton bloom composed primarily the dinoflagellate Lingulodinium polyedra reached historic levels in geographic expanse, duration, density along coast southern California, United States, Baja California Norte, Mexico. Here, we report water quality parameters dissolved oxygen pH over course red tide, as measured by multiple sensors deployed various locations San Diego County, document extent mass organism mortality using field surveys community science...