Richard P Signell, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 83
Ocean and coastal data management
We introduce data management concepts, including what we mean by "data" and its "management," sources of data, interoperability, and data geometry. We then discuss various components of a data management system. Finally, we summarize some existing ocean and coastal data management efforts. We make specific recommendations throughout the paper. We are generally optimistic that ocean and coastal dat
Authors
Jeff de La Beaujardière, C Beegle-Krause, Luis Bermudez, Steven C. Hankin, Lisa Hazard, Eoin Howlett, Steven Le, Roger Proctor, Richard P. Signell, Derrick P. Snowden, Julie Thomas
NetCDF-CF-OPeNDAP: Standards for ocean data interoperability and object lessons for community data standards processes
It is generally recognized that meeting society's emerging environmental science and management needs will require the marine data community to provide simpler, more effective and more interoperable access to its data. There is broad agreement, as well, that data standards are the bedrock upon which interoperability will be built. The path that would bring the marine data community to agree upon a
Authors
Steven C. Hankin, Jon D. Blower, Thierry Carval, Kenneth S. Casey, Craig Donlon, Olivier Lauret, Thomas Loubrieu, Ashwanth Srinivasan, Joaquin Trinanes, Øystein Godøy, Roy Mendelssohn, Richard P. Signell, Jeff de La Beaujardiere, Peter Cornillon, Frederique Blanc, Russ Rew, Jack Harlan
Connections Among the Spatial and Temporal Structures in Tidal Currents, Internal Bores, and Surficial Sediment Distributions Over the Shelf off Palos Verdes, California
The topography of the Continental Shelf in the central portion of the Southern California Bight has rapid variations over relatively small spatial scales. The width of the shelf off the Palos Verdes peninsula, just northwest of Los Angeles, California, is only 1 to 3 km. About 7 km southeast of the peninsula, the shelf within San Pedro Bay widens to about 20 km. In 2000, the Los Angeles County San
Authors
Marlene A. Noble, Kurt J. Rosenberger, Jingping Xu, Richard P. Signell, Alex Steele
Deposition and flux of sediment from the Po River, Italy: An idealized and wintertime numerical modeling study
Recent studies of sediment dynamics and clinoform development in the northern Adriatic Sea focused on winter 2002-2003 and provided the data and motivation for development of a detailed sediment-transport model for the area near the Po River delta. We used both idealized test cases and more realistic simulations to improve our understanding of seasonal sediment dynamics there. We also investigated
Authors
A.J. Bever, C. K. Harris, C. R. Sherwood, R. P. Signell
Sediment dispersal in the northwestern Adriatic Sea
Sediment dispersal in the Adriatic Sea was evaluated using coupled three-dimensional circulation and sediment transport models, representing conditions from autumn 2002 through spring 2003. The calculations accounted for fluvial sources, resuspension by waves and currents, and suspended transport. Sediment fluxes peaked during southwestward Bora wind conditions that produced energetic waves and st
Authors
C. K. Harris, C. R. Sherwood, R. P. Signell, A.J. Bever, J.C. Warner
Ocean forecasting in terrain-following coordinates: Formulation and skill assessment of the Regional Ocean Modeling System
Systematic improvements in algorithmic design of regional ocean circulation models have led to significant enhancement in simulation ability across a wide range of space/time scales and marine system types. As an example, we briefly review the Regional Ocean Modeling System, a member of a general class of three-dimensional, free-surface, terrain-following numerical models. Noteworthy characteristi
Authors
D.B. Haidvogel, H. Arango, W.P. Budgell, B.D. Cornuelle, E. Curchitser, Lorenzo E. Di, K. Fennel, W.R. Geyer, A.J. Hermann, L. Lanerolle, J. Levin, J.C. McWilliams, A.J. Miller, A.M. Moore, T.M. Powell, A.F. Shchepetkin, C. R. Sherwood, R. P. Signell, J.C. Warner, J. Wilkin
Variational analysis of drifter positions and model outputs for the reconstruction of surface currents in the central Adriatic during fall 2002
In this paper we present an application of a variational method for the reconstruction of the velocity field in a coastal flow in the central Adriatic Sea, using in situ data from surface drifters and outputs from the ROMS circulation model. The variational approach, previously developed and tested for mesoscale open ocean flows, has been improved and adapted to account for inhomogeneities on boun
Authors
V. Taillandier, A. Griffa, P.-M. Poulain, R. Signell, J. Chiggiato, S. Carniel
Surface drift prediction in the Adriatic Sea using hyper-ensemble statistics on atmospheric, ocean and wave models: Uncertainties and probability distribution areas
Despite numerous and regular improvements in underlying models, surface drift prediction in the ocean remains a challenging task because of our yet limited understanding of all processes involved. Hence, deterministic approaches to the problem are often limited by empirical assumptions on underlying physics. Multi-model hyper-ensemble forecasts, which exploit the power of an optimal local combinat
Authors
M. Rixen, E. Ferreira-Coelho, R. Signell
Collaboration tools and techniques for large model datasets
In MREA and many other marine applications, it is common to have multiple models running with different grids, run by different institutions. Techniques and tools are described for low-bandwidth delivery of data from large multidimensional datasets, such as those from meteorological and oceanographic models, directly into generic analysis and visualization tools. Output is stored using the NetCDF
Authors
R. P. Signell, S. Carniel, J. Chiggiato, I. Janekovic, J. Pullen, C. R. Sherwood
Development of a three-dimensional, regional, coupled wave, current, and sediment-transport model
We are developing a three-dimensional numerical model that implements algorithms for sediment transport and evolution of bottom morphology in the coastal-circulation model Regional Ocean Modeling System (ROMS v3.0), and provides a two-way link between ROMS and the wave model Simulating Waves in the Nearshore (SWAN) via the Model-Coupling Toolkit. The coupled model is applicable for fluvial, estuar
Authors
J.C. Warner, C. R. Sherwood, R. P. Signell, C. K. Harris, H.G. Arango
Bora event variability and the role of air-sea feedback
A two-way interacting high resolution numerical simulation of the Adriatic Sea using the Navy Coastal Ocean Model (NCOM) and Coupled Ocean/ Atmosphere Mesoscale Prediction System (COAMPS??) was conducted to improve forecast momentum and heat flux fields, and to evaluate surface flux field differences for two consecutive bora events during February 2003. (COAMPS?? is a registered trademark of the N
Authors
J. Pullen, J.D. Doyle, T. Haack, C. Dorman, R. P. Signell, C.M. Lee
Blooms of the toxic dinoflagellate Alexandrium fundyense in the western Gulf of Maine in 1993 and 1994: A comparative modeling study
Blooms of the toxic dinoflagellate Alexandrium fundyense commonly occur in the western Gulf of Maine but the amount of toxin observed in coastal shellfish is highly variable. In this study, a coupled physical-biological model is used to investigate the dynamics underlying the observed A. fundyense abundance and shellfish toxicity in 1993 (a high toxicity year) and 1994 (low toxicity year). The phy
Authors
C.A. Stock, D.J. McGillicuddy, D.M. Anderson, A.R. Solow, R. P. Signell
Science and Products
Filter Total Items: 83
Ocean and coastal data management
We introduce data management concepts, including what we mean by "data" and its "management," sources of data, interoperability, and data geometry. We then discuss various components of a data management system. Finally, we summarize some existing ocean and coastal data management efforts. We make specific recommendations throughout the paper. We are generally optimistic that ocean and coastal dat
Authors
Jeff de La Beaujardière, C Beegle-Krause, Luis Bermudez, Steven C. Hankin, Lisa Hazard, Eoin Howlett, Steven Le, Roger Proctor, Richard P. Signell, Derrick P. Snowden, Julie Thomas
NetCDF-CF-OPeNDAP: Standards for ocean data interoperability and object lessons for community data standards processes
It is generally recognized that meeting society's emerging environmental science and management needs will require the marine data community to provide simpler, more effective and more interoperable access to its data. There is broad agreement, as well, that data standards are the bedrock upon which interoperability will be built. The path that would bring the marine data community to agree upon a
Authors
Steven C. Hankin, Jon D. Blower, Thierry Carval, Kenneth S. Casey, Craig Donlon, Olivier Lauret, Thomas Loubrieu, Ashwanth Srinivasan, Joaquin Trinanes, Øystein Godøy, Roy Mendelssohn, Richard P. Signell, Jeff de La Beaujardiere, Peter Cornillon, Frederique Blanc, Russ Rew, Jack Harlan
Connections Among the Spatial and Temporal Structures in Tidal Currents, Internal Bores, and Surficial Sediment Distributions Over the Shelf off Palos Verdes, California
The topography of the Continental Shelf in the central portion of the Southern California Bight has rapid variations over relatively small spatial scales. The width of the shelf off the Palos Verdes peninsula, just northwest of Los Angeles, California, is only 1 to 3 km. About 7 km southeast of the peninsula, the shelf within San Pedro Bay widens to about 20 km. In 2000, the Los Angeles County San
Authors
Marlene A. Noble, Kurt J. Rosenberger, Jingping Xu, Richard P. Signell, Alex Steele
Deposition and flux of sediment from the Po River, Italy: An idealized and wintertime numerical modeling study
Recent studies of sediment dynamics and clinoform development in the northern Adriatic Sea focused on winter 2002-2003 and provided the data and motivation for development of a detailed sediment-transport model for the area near the Po River delta. We used both idealized test cases and more realistic simulations to improve our understanding of seasonal sediment dynamics there. We also investigated
Authors
A.J. Bever, C. K. Harris, C. R. Sherwood, R. P. Signell
Sediment dispersal in the northwestern Adriatic Sea
Sediment dispersal in the Adriatic Sea was evaluated using coupled three-dimensional circulation and sediment transport models, representing conditions from autumn 2002 through spring 2003. The calculations accounted for fluvial sources, resuspension by waves and currents, and suspended transport. Sediment fluxes peaked during southwestward Bora wind conditions that produced energetic waves and st
Authors
C. K. Harris, C. R. Sherwood, R. P. Signell, A.J. Bever, J.C. Warner
Ocean forecasting in terrain-following coordinates: Formulation and skill assessment of the Regional Ocean Modeling System
Systematic improvements in algorithmic design of regional ocean circulation models have led to significant enhancement in simulation ability across a wide range of space/time scales and marine system types. As an example, we briefly review the Regional Ocean Modeling System, a member of a general class of three-dimensional, free-surface, terrain-following numerical models. Noteworthy characteristi
Authors
D.B. Haidvogel, H. Arango, W.P. Budgell, B.D. Cornuelle, E. Curchitser, Lorenzo E. Di, K. Fennel, W.R. Geyer, A.J. Hermann, L. Lanerolle, J. Levin, J.C. McWilliams, A.J. Miller, A.M. Moore, T.M. Powell, A.F. Shchepetkin, C. R. Sherwood, R. P. Signell, J.C. Warner, J. Wilkin
Variational analysis of drifter positions and model outputs for the reconstruction of surface currents in the central Adriatic during fall 2002
In this paper we present an application of a variational method for the reconstruction of the velocity field in a coastal flow in the central Adriatic Sea, using in situ data from surface drifters and outputs from the ROMS circulation model. The variational approach, previously developed and tested for mesoscale open ocean flows, has been improved and adapted to account for inhomogeneities on boun
Authors
V. Taillandier, A. Griffa, P.-M. Poulain, R. Signell, J. Chiggiato, S. Carniel
Surface drift prediction in the Adriatic Sea using hyper-ensemble statistics on atmospheric, ocean and wave models: Uncertainties and probability distribution areas
Despite numerous and regular improvements in underlying models, surface drift prediction in the ocean remains a challenging task because of our yet limited understanding of all processes involved. Hence, deterministic approaches to the problem are often limited by empirical assumptions on underlying physics. Multi-model hyper-ensemble forecasts, which exploit the power of an optimal local combinat
Authors
M. Rixen, E. Ferreira-Coelho, R. Signell
Collaboration tools and techniques for large model datasets
In MREA and many other marine applications, it is common to have multiple models running with different grids, run by different institutions. Techniques and tools are described for low-bandwidth delivery of data from large multidimensional datasets, such as those from meteorological and oceanographic models, directly into generic analysis and visualization tools. Output is stored using the NetCDF
Authors
R. P. Signell, S. Carniel, J. Chiggiato, I. Janekovic, J. Pullen, C. R. Sherwood
Development of a three-dimensional, regional, coupled wave, current, and sediment-transport model
We are developing a three-dimensional numerical model that implements algorithms for sediment transport and evolution of bottom morphology in the coastal-circulation model Regional Ocean Modeling System (ROMS v3.0), and provides a two-way link between ROMS and the wave model Simulating Waves in the Nearshore (SWAN) via the Model-Coupling Toolkit. The coupled model is applicable for fluvial, estuar
Authors
J.C. Warner, C. R. Sherwood, R. P. Signell, C. K. Harris, H.G. Arango
Bora event variability and the role of air-sea feedback
A two-way interacting high resolution numerical simulation of the Adriatic Sea using the Navy Coastal Ocean Model (NCOM) and Coupled Ocean/ Atmosphere Mesoscale Prediction System (COAMPS??) was conducted to improve forecast momentum and heat flux fields, and to evaluate surface flux field differences for two consecutive bora events during February 2003. (COAMPS?? is a registered trademark of the N
Authors
J. Pullen, J.D. Doyle, T. Haack, C. Dorman, R. P. Signell, C.M. Lee
Blooms of the toxic dinoflagellate Alexandrium fundyense in the western Gulf of Maine in 1993 and 1994: A comparative modeling study
Blooms of the toxic dinoflagellate Alexandrium fundyense commonly occur in the western Gulf of Maine but the amount of toxin observed in coastal shellfish is highly variable. In this study, a coupled physical-biological model is used to investigate the dynamics underlying the observed A. fundyense abundance and shellfish toxicity in 1993 (a high toxicity year) and 1994 (low toxicity year). The phy
Authors
C.A. Stock, D.J. McGillicuddy, D.M. Anderson, A.R. Solow, R. P. Signell