River plumes are a ubiquitous feature of coastal ocean flow. They are regions of strong gradients in both physical tracers and biological properties. I am involved in a study of the Merrimack River plume that investigates, through field measurements, laboratory experiments, and numerical modeling, how the energetic outflow from the Merrimack River estuary transitions to a broad-scale, geostrophic coastal current.
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I have had a number of publications that have investigated the processes that influence circulation in estuaries. This work has focused primarily on understanding salt intrusion length- and time-scales, and the processes controlling estuarine exchange rates.
I have a number of projects based on understanding and predicting circulation over the Texas-Louisiana continental shelf. The Texas-Louisiana shelf is a broad shelf with strong buoyancy forcing from the Mississippi and Atchafalaya rivers. Seasonal wind patterns cause the fresh water from these rivers to pool up south of Louisiana in the summertime, and to flow downcoast along the Texas coast during the rest of the year.
Seasonal hypoxia forms in near-bottom waters over the Texas-Louisiana shelf in late summer. My research involves examining the influence of physics on the formation, maintenance and destruction of seasonal hypoxia. I have demonstrated that there are different regions along the shelf in which the processes that form hypoxia are distinct. This work is funded by the National Oceanic and Atmospheric Administration.
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We run a nowcast/forecast model of wind-driven circulation over the Texas-Louisiana continental shelf for oil spill trajectory modeling. We use predicted wind fields (the NCEP ETA model) to drive a circulation. This work is funded by the Texas General Land Office.Selected publications:
Harmful algal blooms (K. brevis) occur nearly every year off the coast of Florida, but only sporadically off the coast of Texas. We are using numerical simulations of circulation over the Texas-Louisiana shelf to understand the formation of K. brevis blooms along the Texas coast. Our hypothesis is that downwelling wind events may concentrate K. brevis along the coast, and lead to bloom formation.Selected publications:
ROMS is an open-source, community ocean model. ROMS uses a horizontal, curvilinear C-grid and a stretched vertical coordinate. In addition to the core hydrodynamic engine, ROMS has many additional packages for calculating biogeochemical processes, sediment transport. I have been using ROMS for nearly a decade, and have contributed to the code base by adding riverine fresh-water fluxes.
Python is a high-level scripting language, similar to perl or matlab. Python has powerful numerical computing packages, primarily based on numpy/scipy that make it ideal for scientific computation and analysis. For visualization, I use the matplotlib package. In many ways, Python is as simple to learn and as powerful MATLAB, both in terms of computational ability and speed as well as visualization. However, Python is based on a more powerful, object-oriented programing language. For more information, see my Python page.
I maintain a number of high-performance cluster computers. These machines are either Intel or AMD processors, and are connected with Infiniband. I have purchased my most recent clusters from Advanced HPC. Links to the ganglia pages for each cluster:
Texas A&M University
Department of Oceanography