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Ocean Engineering and Marine Sciences Faculty Publications

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Articles 1 - 30 of 78

Full-Text Articles in Physical Sciences and Mathematics

Rescape: Transforming Coral-Reefscape Images For Quantitative Analysis, Zachary Ferris, Eraldo Ribeiro, Tomofumi Nagata, Robert Van Woesik Apr 2024

Rescape: Transforming Coral-Reefscape Images For Quantitative Analysis, Zachary Ferris, Eraldo Ribeiro, Tomofumi Nagata, Robert Van Woesik

Ocean Engineering and Marine Sciences Faculty Publications

Ever since the first image of a coral reef was captured in 1885, people worldwide have been accumulating images of coral reefscapes that document the historic conditions of reefs. However, these innumerable reefscape images suffer from perspective distortion, which reduces the apparent size of distant taxa, rendering the images unusable for quantitative analysis of reef conditions. Here we solve this century-long distortion problem by developing a novel computer-vision algorithm, ReScape, which removes the perspective distortion from reefscape images by transforming them into top-down views, making them usable for quantitative analysis of reef conditions. In doing so, we demonstrate the …

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Climate Adaptation And Risk Preparedness In Florida’S East Coast Cities: Views Of Municipal Leaders, Sheila A. Young, Kenyon C. Lindeman, Samantha R. Fowler Oct 2022

Climate Adaptation And Risk Preparedness In Florida’S East Coast Cities: Views Of Municipal Leaders, Sheila A. Young, Kenyon C. Lindeman, Samantha R. Fowler

Ocean Engineering and Marine Sciences Faculty Publications

Cities along Florida’s Atlantic coastline are particularly vulnerable to the effects of climate change, posing significant challenges for city planners. How cities see themselves in terms of developing or implementing their climate change adaptation action plans depends, in part, on the extent to which they perceive climate-related events as risks, and their city size. Data were obtained from city leaders (i.e. mayors, city/town managers, or their designees) from 86 cities along Florida’s Atlantic Coast from January to May 2021 to quantitatively assess factors influencing city adaptation planning. Validity and reliability were obtained for the survey. Multiple regression analyses showed significant …

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Vibration Control Of Submerged Floating Tunnel In Waves And Earthquakes Through Tuned Mass Damper, Chungkuk Jin, Sung-Jae Kim, Moohyun Kim Sep 2022

Vibration Control Of Submerged Floating Tunnel In Waves And Earthquakes Through Tuned Mass Damper, Chungkuk Jin, Sung-Jae Kim, Moohyun Kim

Ocean Engineering and Marine Sciences Faculty Publications

In this study, a passive Tuned Mass Damper (TMD) is investigated to dampen resonant motions of a Submerged Floating Tunnel (SFT) in waves and earthquakes. TMD is adopted to control resonant lateral motion. A time-domain dynamics simulation model that considers the elasticity of the tunnel and mooring lines is first established, which is based on the lumped mass method and Morison equation, and the SFT-TMD interaction is considered through springs and dampers. Next, by using the Harmony Search (HS) algorithm, TMD's spring and damping coefficients are optimized; the dynamics simulations under white noise seismic excitations are continuously carried out with …

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Keeping Up With Sea-Level Rise: Carbonate Production Rates In Palau And Yap, Western Pacific Ocean, Robert Van Woesik, Christopher William Cacciapaglia May 2018

Keeping Up With Sea-Level Rise: Carbonate Production Rates In Palau And Yap, Western Pacific Ocean, Robert Van Woesik, Christopher William Cacciapaglia

Ocean Engineering and Marine Sciences Faculty Publications

Coral reefs protect islands from tropical storm waves and provide goods and services for millions of islanders worldwide. Yet it is unknown how coral reefs in general, and carbonate production in particular, will respond to sea-level rise and thermal stress associated with climate change. This study compared the reef-building capacity of different shallow-water habitats at twenty-four sites on each of two islands, Palau and Yap, in the western Pacific Ocean. We were particularly interested in estimating the inverse problem of calculating the value of live coral cover at which net carbonate production becomes negative, and whether that value varied across …

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Redox-Mediated Quorum Sensing In Plants, Alexandra W. Fuller, Phoebe Young, B. Daniel Pierce, Jamie Kitson-Finuff, Purvi Jain, Karl Schneider, Stephen Lazar, Olga Teran, Andrew G. Palmer, David G. Lynn Sep 2017

Redox-Mediated Quorum Sensing In Plants, Alexandra W. Fuller, Phoebe Young, B. Daniel Pierce, Jamie Kitson-Finuff, Purvi Jain, Karl Schneider, Stephen Lazar, Olga Teran, Andrew G. Palmer, David G. Lynn

Ocean Engineering and Marine Sciences Faculty Publications

The rhizosphere, the narrow zone of soil around plant roots, is a complex network of interactions between plants, bacteria, and a variety of other organisms. The absolute dependence on host-derived signals, or xenognosins, to regulate critical developmental checkpoints for host commitment in the obligate parasitic plants provides a window into the rhizosphere's chemical dynamics. These sessile intruders use H2O2 in a process known as semagenesis to chemically modify the mature root surfaces of proximal host plants and generate p-benzoquinones (BQs). The resulting redox-active signaling network regulates the spatial and temporal commitments necessary for host attachment. Recent evidence from non-parasites, including …

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Timing And Locations Of Reef Fish Spawning Off The Southeastern United States, Nicholas A. Farmer, William D. Heyman, Mandy Kamauskas, Shinichi Kobara, Tracey I. Smart, Joseph C. Ballenger, Marcel J. M. Reichert, David M. Wyanski, Michelle S. Tishler, Kenyon C. Lindeman, Susan K. Lowerre-Barbieri, Theodore S. Switzer, Justin J. Solomon, Kyle Mccain, Mark Marhefka, George R. Sedberry Mar 2017

Timing And Locations Of Reef Fish Spawning Off The Southeastern United States, Nicholas A. Farmer, William D. Heyman, Mandy Kamauskas, Shinichi Kobara, Tracey I. Smart, Joseph C. Ballenger, Marcel J. M. Reichert, David M. Wyanski, Michelle S. Tishler, Kenyon C. Lindeman, Susan K. Lowerre-Barbieri, Theodore S. Switzer, Justin J. Solomon, Kyle Mccain, Mark Marhefka, George R. Sedberry

Ocean Engineering and Marine Sciences Faculty Publications

Managed reef fish in the Atlantic Ocean of the southeastern United States (SEUS) support a multi-billion dollar industry. There is a broad interest in locating and protecting spawning fish from harvest, to enhance productivity and reduce the potential for overfishing. We assessed spatiotemporal cues for spawning for six species from four reef fish families, using data on individual spawning condition collected by over three decades of regional fishery-independent reef fish surveys, combined with a series of predictors derived from bathymetric features. We quantified the size of spawning areas used by reef fish across many years and identified several multispecies spawning …

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Coral Disease Hotspots In The Caribbean, Robert Van Woesik, Carly J. Randall Jan 2017

Coral Disease Hotspots In The Caribbean, Robert Van Woesik, Carly J. Randall

Ocean Engineering and Marine Sciences Faculty Publications

Recent outbreaks of coral diseases in the Caribbean have been linked to increasingly stressful sea-surface temperatures (SSTs). Yet, ocean warming is spatially heterogeneous and therefore has the potential to lead to hotspots of disease activity. Here, we take an epidemiological approach to examine spatial differences in the risk of white-band disease on Acropora spp. and yellow-band disease on Orbicella spp. in the Caribbean. Our analysis involved examining the spatial patterns of disease prevalence, and creating a Bayesian-risk model that tested for regional differences in disease risk. The spatial examination of disease prevalence showed several clusters of white-band disease, including high …

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Bumper V1.0: A Bayesian User-Friendly Model For Palaeo-Environmental Reconstruction, Philip B. Holden, H. John B. Birks, Stephen J. Brooks, Mark B. Bush, Grace M. Hwang, Frazer Matthews-Bird, Bryan G. Valencia, Robert Van Woeslk Jan 2017

Bumper V1.0: A Bayesian User-Friendly Model For Palaeo-Environmental Reconstruction, Philip B. Holden, H. John B. Birks, Stephen J. Brooks, Mark B. Bush, Grace M. Hwang, Frazer Matthews-Bird, Bryan G. Valencia, Robert Van Woeslk

Ocean Engineering and Marine Sciences Faculty Publications

We describe the Bayesian user-friendly model for palaeo-environmental reconstruction (BUMPER), a Bayesian transfer function for inferring past climate and other environmental variables from microfossil assemblages. BUMPER is fully self-calibrating, straightforward to apply, and computationally fast, requiring ~2 s to build a 100- taxon model from a 100-site training set on a standard personal computer. We apply the model’s probabilistic framework to generate thousands of artificial training sets under ideal assumptions. We then use these to demonstrate the sensitivity of reconstructions to the characteristics of the training set, considering assemblage richness, taxon tolerances, and the number of training sites. We find …

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Numerical Investigations Of Tip Clearance Flow Characteristics Of A Pumpjet Propulsor, Lin Lu, Yuefei Gao, Qiang Li, Lin Du Jan 2017

Numerical Investigations Of Tip Clearance Flow Characteristics Of A Pumpjet Propulsor, Lin Lu, Yuefei Gao, Qiang Li, Lin Du

Ocean Engineering and Marine Sciences Faculty Publications

In this study, numerical investigations of the tip clearance flow characteristics of a pumpjet propulsor based on Computational Fluid Dynamics (CFD) method have been presented. The Zwart-Gerber-Belamri (Z-G-B) cavitation model based on Reynolds Averaged NaviereStokes (RANS) method is employed. The structured gird is applied. The formation and development of the tip clearance flows has been investigated and presented. The structure of the tip leakage vortex has been shown. The radial distributions of different velocity components with different Span along the axial direction have been carried out to present the influence of the tip clearance flow on the main flow. In …

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Hyperspectral Signatures And Worldview-3 Imagery Of Indian River Lagoon And Banana River Estuarine Water And Bottom Types, Charles R. Bostater Jr., Taylor S. Oney, Tyler Rotkiske, Samin Aziz, Charles Morrisette, Kelby Callahan, Devin Mcallister Jan 2017

Hyperspectral Signatures And Worldview-3 Imagery Of Indian River Lagoon And Banana River Estuarine Water And Bottom Types, Charles R. Bostater Jr., Taylor S. Oney, Tyler Rotkiske, Samin Aziz, Charles Morrisette, Kelby Callahan, Devin Mcallister

Ocean Engineering and Marine Sciences Faculty Publications

Hyperspectral signatures and imagery collected during the spring and summer of 2017 and 2016 are presented. Ground sampling distances (GSD) and pixel sizes were sampled from just over a meter to less than 4.0 mm. A pushbroom hyperspectral imager was used to calculate bidirectional reflectance factor (BRF) signatures. Hyperspectral signatures of different water types and bottom habitats such as submerged seagrasses, drift algae and algal bloom waters were scanned using a high spectral and digital resolution solid state spectrograph. WorldView-3 satellite imagery with minimal water wave sun glint effects was used to demonstrate the ability to detect bottom features using …

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Collection And Corrections Of Oblique Multiangle Hyperspectral Bidirectional Reflectance Imagery Of The Water Surface, Charles R. Bostater Jr., Taylor S. Oney Jan 2017

Collection And Corrections Of Oblique Multiangle Hyperspectral Bidirectional Reflectance Imagery Of The Water Surface, Charles R. Bostater Jr., Taylor S. Oney

Ocean Engineering and Marine Sciences Faculty Publications

Hyperspectral images of coastal waters in urbanized regions were collected from fixed platform locations. Surf zone imagery, images of shallow bays, lagoons and coastal waters are processed to produce bidirectional reflectance factor (BRF) signatures corrected for changing viewing angles. Angular changes as a function of pixel location within a scene are used to estimate changes in pixel size and ground sampling areas. Diffuse calibration targets collected simultaneously from within the image scene provides the necessary information for calculating BRF signatures of the water surface and shorelines. Automated scanning using a pushbroom hyperspectral sensor allows imagery to be collected on the …

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Super-Oceanic Winds Over A Narrow Coastal Estuary In Onshore Flow Events, Michael Splitt, Steven M. Lazarus, Jeff Colvin, Bryan P. Holman Jan 2016

Super-Oceanic Winds Over A Narrow Coastal Estuary In Onshore Flow Events, Michael Splitt, Steven M. Lazarus, Jeff Colvin, Bryan P. Holman

Ocean Engineering and Marine Sciences Faculty Publications

Indian River Lagoon Winds -- Shallow water estuary -- Average depth ~ 1 m -- Fetch limited except NNW/SSE -- Stretches 150 miles north/south -- Limited exchange with ocean via inlets -- Improvement of wind forcing -- Wind set-up and surge forecasting -- Significant wave height forecasting -- “cheaper” solutions for ensemble forecasts -- Protection of life & property (NWS) -- Ecological system impacts (local science)

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Impacts Of Bias Correction Of Wind Forecasts On Hydrodynamic And Wave Model Predictions, Robert J. Weaver, Peyman Taeb, Bryan P. Holman, Steven M. Lazarus, Michael E. Splitt, Atousa Saberi, Jeff Colvin Jan 2016

Impacts Of Bias Correction Of Wind Forecasts On Hydrodynamic And Wave Model Predictions, Robert J. Weaver, Peyman Taeb, Bryan P. Holman, Steven M. Lazarus, Michael E. Splitt, Atousa Saberi, Jeff Colvin

Ocean Engineering and Marine Sciences Faculty Publications

High-resolution hydrodynamic models are forced by surface wind output from operational met. models. Current suite of operational met. models do not have the spatial resolution needed to resolve the fine scale processes associated with complex estuarine wind-driven circulation nor a detailed land-water mask. Goal: improve forecast wind forcing in most efficient manner as possible

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Forecasting Significant Wave Height In A Coastal Estuary, Steven M. Lazarus, Michael Splitt, Jeff Colvin, Bryan Holman, Robert Weaver, Peyman Taeb, Atousa Saberi Jan 2016

Forecasting Significant Wave Height In A Coastal Estuary, Steven M. Lazarus, Michael Splitt, Jeff Colvin, Bryan Holman, Robert Weaver, Peyman Taeb, Atousa Saberi

Ocean Engineering and Marine Sciences Faculty Publications

Would like to ‘extend’ the Nearshore Wave Prediction System (NWPS, Van Der Westhuysen et al. 2013) into a large narrow estuary (Indian River Lagoon, IRL). Full-blown hydrodynamic simulations

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Inferring Late-Holocene Climate In The Ecuadorian Andes Using A Chironomid-Based Temperature Inference Model, Frazer Matthews-Bird, Stephen J. Brooks, Philip B. Holden, Encarni Montoya, William D. Gosling Jan 2016

Inferring Late-Holocene Climate In The Ecuadorian Andes Using A Chironomid-Based Temperature Inference Model, Frazer Matthews-Bird, Stephen J. Brooks, Philip B. Holden, Encarni Montoya, William D. Gosling

Ocean Engineering and Marine Sciences Faculty Publications

Presented here is the first chironomid calibration data set for tropical South America. Surface sediments were collected from 59 lakes across Bolivia (15 lakes), Peru (32 lakes), and Ecuador (12 lakes) between 2004 and 2013 over an altitudinal gradient from 150 m above sea level (a.s.l) to 4655 m a.s.l, between 0–17° S and 64–78° W. The study sites cover a mean annual temperature (MAT) gradient of 25 °C. In total, 55 chironomid taxa were identified in the 59 calibration data set lakes. When used as a single explanatory variable, MAT explains 12.9 % of the variance (λ1/λ2 =  1.431). …

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Benthic Marine Calcifiers Coexist With Caco3-Undersaturated Seawater Worldwide, Mario Lebrato, Andreas J. Andersson, Justin Baker Ries, Richard B. Aronson, Miles D. Lamare, Wolfgang Koeve, Andreas Oschlies, Maria Débora Iglesias-Rodríguez, Sven Thatje, M. Amsler, Stephanie C. Vos, D. O. B. Jones, H. A. Ruhl, A. R. Gates, J. B. Mcclintock Jan 2016

Benthic Marine Calcifiers Coexist With Caco3-Undersaturated Seawater Worldwide, Mario Lebrato, Andreas J. Andersson, Justin Baker Ries, Richard B. Aronson, Miles D. Lamare, Wolfgang Koeve, Andreas Oschlies, Maria Débora Iglesias-Rodríguez, Sven Thatje, M. Amsler, Stephanie C. Vos, D. O. B. Jones, H. A. Ruhl, A. R. Gates, J. B. Mcclintock

Ocean Engineering and Marine Sciences Faculty Publications

Ocean acidification and decreasing seawater saturation state with respect to calcium carbonate (CaCO3) minerals have raised concerns about the consequences to marine organisms that build CaCO3 structures. A large proportion of benthic marine calcifiers incorporate Mg2+ into their skeletons (Mg-calcite), which, in general, reduces mineral stability. The relative vulnerability of some marine calcifiers to ocean acidification appears linked to the relative solubility of their shell or skeletal mineralogy, although some organisms have sophisticated mechanisms for constructing and maintaining their CaCO3 structures causing deviation from this dependence. Nevertheless, few studies consider seawater saturation state with respect to the actual Mg-calcite mineralogy …

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Environmental Controls On The Distribution And Diversity Of Lentic Chironomidae (Insecta: Diptera) Across An Altitudinal Gradient In Tropical South America, Frazer Matthews-Bird, William D. Gosling, Angela L. Coe, Mark Bush, Francis E. Mayle, Yarrow Axford, Stephen J. Brooks Jan 2016

Environmental Controls On The Distribution And Diversity Of Lentic Chironomidae (Insecta: Diptera) Across An Altitudinal Gradient In Tropical South America, Frazer Matthews-Bird, William D. Gosling, Angela L. Coe, Mark Bush, Francis E. Mayle, Yarrow Axford, Stephen J. Brooks

Ocean Engineering and Marine Sciences Faculty Publications

To predict the response of aquatic ecosystems to future global climate change, data on the ecology and distribution of keystone groups in freshwater ecosystems are needed. In contrast to mid- and high-latitude zones, such data are scarce across tropical South America (Neotropics). We present the distribution and diversity of chironomid species using surface sediments of 59 lakes from the Andes to the Amazon (0.1–17°S and 64–78°W) within the Neotropics. We assess the spatial variation in community assemblages and identify the key variables influencing the distributional patterns. The relationships between environmental variables (pH, conductivity, depth, and sediment organic content), climatic data, …

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Relativistic Electron Avalanches As A Thunderstorm Discharge Competing With Lightning, Nicole A. Kelley, David M. Smith, Joseph R. Dwyer, Michael Splitt, Steven Lazarus, Forest Martinez-Mckinney, Bryna Hazelton, Brian Grefenstette, Alexander Lowell, Hamid K. Rassoul Jan 2015

Relativistic Electron Avalanches As A Thunderstorm Discharge Competing With Lightning, Nicole A. Kelley, David M. Smith, Joseph R. Dwyer, Michael Splitt, Steven Lazarus, Forest Martinez-Mckinney, Bryna Hazelton, Brian Grefenstette, Alexander Lowell, Hamid K. Rassoul

Ocean Engineering and Marine Sciences Faculty Publications

Gamma-ray ‘glows’ are long duration (seconds to tens of minutes) X-ray and gamma-ray emission coming from thunderclouds. Measurements suggest the presence of relativistic runaway electron avalanches (RREA), the same process underlying terrestrial gamma-ray flashes. Here we demonstrate that glows are relatively a common phenomena near the tops of thunderstorms, when compared with events such as terrestrial gamma-ray flashes. Examining the strongest glow measured by the airborne detector for energetic emissions, we show that this glow is measured near the end of a downward RREA, consistent with occurring between the upper positive charge layer and the negative screening layer above it. …

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Effects Of Ocean Acidification On The Dissolution Rates Of Reef-Coral Skeletons, Robert Van Woesik, Kelly Van Woesik, Liana Van Woesik, Sandra Van Woesik Nov 2014

Effects Of Ocean Acidification On The Dissolution Rates Of Reef-Coral Skeletons, Robert Van Woesik, Kelly Van Woesik, Liana Van Woesik, Sandra Van Woesik

Ocean Engineering and Marine Sciences Faculty Publications

Ocean acidification threatens the foundation of tropical coral reefs. This study investigated three aspects of ocean acidification: (i) the rates at which perforate and imperforate coral-colony skeletons passively dissolve when pH is 7.8, which is predicted to occur globally by 2100, (ii) the rates of passive dissolution of corals with respect to coral-colony surface areas, and (iii) the comparative rates of a vertical reef-growth model, incorporating passive dissolution rates, and predicted sea-level rise. By 2100, when the ocean pH is expected to be 7.8, perforate Montipora coral skeletons will lose on average 15 kg CaCO3 m􀀀2 y􀀀1, which is approximately …

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A Depth Refugium From Catastrophic Coral Bleaching Prevents Regional Extinction, Tyler B. Smith, Peter W. Glynn, Juan L. Maté, Lauren T. Toth, Joanna Gyory Jan 2014

A Depth Refugium From Catastrophic Coral Bleaching Prevents Regional Extinction, Tyler B. Smith, Peter W. Glynn, Juan L. Maté, Lauren T. Toth, Joanna Gyory

Ocean Engineering and Marine Sciences Faculty Publications

Species intolerant of changing climate might avoid extinction within refugia buffered from extreme conditions. Refugia have been observed in the fossil record but are not well documented or understood on ecological time scales. Using a 37-year record from the eastern Pacific across the two most severe El Nin˜ o events on record (1982–1983 and 1997– 1998) we show how an exceptionally thermally sensitive reef-building hydrocoral, Millepora intricata, twice survived catastrophic bleaching in a deeper-water refuge (.11 m depth). During both events, M. intricata was extirpated across its range in shallow water, but showed recovery within several years, while two other …

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Comparing Biofouling Control Treatments For Use On Aquaculture Nets, Geoffrey Swain, Nagahiko Shinjo Jan 2014

Comparing Biofouling Control Treatments For Use On Aquaculture Nets, Geoffrey Swain, Nagahiko Shinjo

Ocean Engineering and Marine Sciences Faculty Publications

Test panels comprised of uncoated, copper coated and silicone coated 7/8'' (22 mm) mesh knitted nylon net were evaluated to compare their properties and the effectiveness to prevent biofouling. This paper describes test procedures that were developed to quantify the performance in terms of antifouling, cleanability, drag and cost. The copper treatment was the most effective at controlling fouling, however, the silicone treated nets were the easiest to clean. The drag forces on the net were a function of twine diameter, twine roughness and fouling. After immersion, the uncoated nets had the most drag followed by the silicone and copper …

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Corals On Acid: An Inquiry-Based Activity Leading Students To A Better Understanding Of Ocean Acidification Impacts, Casey L. Boleman, Philip M. Gravinese, Ellen N. Muse, Andrea E. Marston, John G. Windsor Dec 2013

Corals On Acid: An Inquiry-Based Activity Leading Students To A Better Understanding Of Ocean Acidification Impacts, Casey L. Boleman, Philip M. Gravinese, Ellen N. Muse, Andrea E. Marston, John G. Windsor

Ocean Engineering and Marine Sciences Faculty Publications

The objective of this inquiry-based lesson is for students to gain an understanding of how increasing ocean acidity can affect the calcification of marine organisms. During this activity, students: (1) design an experiment to quantify the CaCO3 concentration of two invertebrate skeletal samples, one that has been soaked in normal seawater and another in a low pH solution, and (2) use critical thinking and discussion to evaluate possible explanations for the difference in the skeletal CaCO3 compositions. Our lesson focuses on exploring the activity before ocean acidification is introduced to provide a common conceptual framework to engage students.

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Evaluation Of A Wind-Wave System For Ensemble Tropical Cyclone Wave Forecasting. Part Ii: Waves, Steven M. Lazarus, Samuel T. Wilson, Michael E. Splitt, Gary A. Zarillo Apr 2013

Evaluation Of A Wind-Wave System For Ensemble Tropical Cyclone Wave Forecasting. Part Ii: Waves, Steven M. Lazarus, Samuel T. Wilson, Michael E. Splitt, Gary A. Zarillo

Ocean Engineering and Marine Sciences Faculty Publications

A wind-wave forecast system, designed with the intention of generating unbiased ensemble wave forecasts for extreme wind events, is assessed. Wave hindcasts for 12 tropical cyclones (TCs) are forced using a wind analysis produced from a combination of the North American Regional Reanalysis (NARR) and a parametric wind model. The default drag parameterization is replaced by one that is more in line with recent studies where a cap at weak-to-moderate wind speeds is applied. Quadrant-based significant wave height (Hs) statistics are composited in a storm-relative reference frame and stratified by the radius of maximum wind, storm speed, and storm intensity. …

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Evaluation Of A Wind-Wave System For Ensemble Tropical Cyclone Wave Forecasting. Part I: Winds, Steven M. Lazarus, Samuel T. Wilson, Michael E. Splitt, Gary A. Zarillo Apr 2013

Evaluation Of A Wind-Wave System For Ensemble Tropical Cyclone Wave Forecasting. Part I: Winds, Steven M. Lazarus, Samuel T. Wilson, Michael E. Splitt, Gary A. Zarillo

Ocean Engineering and Marine Sciences Faculty Publications

A computationally efficient method of producing tropical cyclone (TC) wind analyses is developed and tested, using a hindcast methodology, for 12 Gulf of Mexico storms. The analyses are created by blending synthetic data, generated from a simple parametric model constructed using extended best-track data and climatology, with a first-guess field obtained from the NCEP-NCAR North American Regional Reanalysis (NARR). Tests are performed whereby parameters in the wind analysis and vortex model are varied in an attempt to best represent the TC wind fields.Acomparison between nonlinear and climatological estimates of the TC size parameter indicates that the former yields a much …

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Relative Roles Of Circumnavigating Waves And Extratropics On The Mjo And Its Relationship With The Mean State, Pallav Ray, Tim Li Jan 2013

Relative Roles Of Circumnavigating Waves And Extratropics On The Mjo And Its Relationship With The Mean State, Pallav Ray, Tim Li

Ocean Engineering and Marine Sciences Faculty Publications

Aset of atmospheric general circulation model (GCM) experiments is designed to explore the relative roles of the circumnavigating waves and the extratropics on the Madden–Julian oscillation (MJO). In a ‘‘control’’ simulation, the model is forced by the climatological monthly sea surface temperature for 20 yr. In the first sensitivity experiment, model prognostic variables are relaxed in the tropical Atlantic region (208S–208N, 808W–08) toward the ‘‘controlled’’ climatological annual cycle to suppress the influences from the circumnavigating waves. In the second sensitivity experiment, model prognostic variables are relaxed in the 208–308 latitude zones toward the controlled climatological annual cycle to suppress the …

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Photographic Survey Of Benthos Provides Insights Into The Antarctic Fish Fauna From The Marguerite Bay Slope And The Amundsen Sea, Joseph T. Eastman, Margaret O. Amsler, Richard D. Aronson, Sven Thatje, James Mcclintock, Stephanie C. Vos, Jeffrey W. Kaeli, Hanumant Singh, Mario La Mesa Jan 2013

Photographic Survey Of Benthos Provides Insights Into The Antarctic Fish Fauna From The Marguerite Bay Slope And The Amundsen Sea, Joseph T. Eastman, Margaret O. Amsler, Richard D. Aronson, Sven Thatje, James Mcclintock, Stephanie C. Vos, Jeffrey W. Kaeli, Hanumant Singh, Mario La Mesa

Ocean Engineering and Marine Sciences Faculty Publications

We reviewed photographic images of fishes from depths of 381–2282m in Marguerite Bay and 405–2007m in the Amundsen Sea. Marguerite Bay fishes were 33% notothenioids and 67% non-notothenioids. Channichthyids (47%) and nototheniids (44%) were the most abundant notothenioids. The deep-living channichthyid Chionobathyscus dewitti (74%) and the nototheniid genus Trematomus (66%) were the most abundant taxa within these two families. The most abundant non-notothenioids were the macrourid Macrourus whitsoni (72%) and zoarcids (18%). Amundsen Sea fishes were 87% notothenioids and 13% non-notothenioids, the latter exclusively Macrourus whitsoni. Bathydraconids (38%) and artedidraconids (30%) were the most abundant notothenioids. We observed that Macrourus …

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Power Estimates Associated With Internal Tides From The Monterey Bay Area, Steven M. Jachec Jan 2012

Power Estimates Associated With Internal Tides From The Monterey Bay Area, Steven M. Jachec

Ocean Engineering and Marine Sciences Faculty Publications

Numerical modeling has proven to be a useful method for simulating internal tides within the coastal ocean. Monterey Bay is a location that experiences energetic semidiurnal internal tides, and they are pronounced within Monterey Submarine Canyon. Numerical simulations and field measurements indicate that the baroclinic energy fluxes there are spatially variable, leading to locations of positive and negative baroclinic energy flux divergences. Results derived from a SUNTANS (Stanford Unstructured Nonhydrostatic Terrain-following Adaptive Navier-Stokes Simulator) model simulation show that Monterey Submarine Canyon’s baroclinic power is net dissipative (–8.3 MW). However, sources and sinks exist throughout the canyon, and they permeate the …

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Catastrophe And The Life Span Of Coral Reefs, Richard B. Aronson, William F. Precht, Ian G. Macintyre, Lauren T. Toth Jan 2012

Catastrophe And The Life Span Of Coral Reefs, Richard B. Aronson, William F. Precht, Ian G. Macintyre, Lauren T. Toth

Ocean Engineering and Marine Sciences Faculty Publications

A strong earthquake in the western Caribbean in 2009 had a catastrophic impact on uncemented, unconsolidated coral reefs in the central sector of the shelf lagoon of the Belizean barrier reef. In a set of 21 reef sites that had been observed prior to the earthquake, the benthic assemblages of 10 were eradicated, and one was partially damaged, by avalanching of their slopes. Ecological dynamics that had played out over the previous 23 years, including the mass mortalities of two sequentially dominant coral species and a large increase in the cover of an encrusting sponge, were instantaneously rendered moot in …

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Improving High-Resolution Model Forecasts Of Downslope Winds In The Las Vegas Valley, Andre K. Pattantyus, Sen Chiao, Stanley Czyzyk Jun 2011

Improving High-Resolution Model Forecasts Of Downslope Winds In The Las Vegas Valley, Andre K. Pattantyus, Sen Chiao, Stanley Czyzyk

Ocean Engineering and Marine Sciences Faculty Publications

Numerical simulations for severe downslope winds as well as trapped lee waves in Nevada’s Las Vegas Valley were performed in this study. The goal of this study was to improve model forecasts of downslope wind- event intensities. This was measured by assessing different planetary boundary layer (PBL) schemes in the mountain–valley region. The Weather Research and Forecasting Model was adopted for this research. The numerical experiments were constructed using two nested domains, with 4- and 1-km grid resolution. The working hypothesis was that the occurrence of low-level wind shear and surface gustiness in the Las Vegas Valley was guided by …

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Integration, Testing And Calibration Of Imaging Systems For Land & Water Remote Sensing, Charles R. Bostater, James Jones, Heather Frystacky, Mate Kovacs, Oszkar Jozsa Oct 2010

Integration, Testing And Calibration Of Imaging Systems For Land & Water Remote Sensing, Charles R. Bostater, James Jones, Heather Frystacky, Mate Kovacs, Oszkar Jozsa

Ocean Engineering and Marine Sciences Faculty Publications

Imagery is presented along with calibration and testing procedures of several airborne imaging systems. The low altitude airborne systems include a cooled hyperspectral imaging system with 1024 spectral channels and 1375 spatial pixels. The hyperspectral imaging system is collocated with a full resolution high definition video recorder for simultaneous HD video imagery, 12.3 megapixel digital images for multispectral "sharpening" the hyperspectral imagery, or large frame 9 inch film cameras yield scanned aerial imagery with approximately 2200 by 2200 pixel multispectral imagery. Two high spectral (252 channels) and radiometric sensitivity solid state spectrographs are used for collecting upwelling radiance (sub-meter pixels) …

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