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Data Assimilative Modeling in Coastal and Shelf Waters of the U.S. Mid-Atlantic Bight and Gulf of Maine

Start Date: May 3, 2017 - 04:15 PM
End Date: May 3, 2017 - 05:15 PM

By  Prof. John Wilkin
Rutgers, The State University of New Jersey, USA
Host: Prof. Georgiy Stenchikov
Venue: Lecture Hall 1 (2322), Engineering and Science Hall (Building 9)

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​Abstract: Coastal ocean models that downscale basin and global scale models are widely used to study regional circulation at enhanced resolution and locally important ecosystem and biogeochemical processes. When operated as now-cast/forecast systems, these models offer predictions that assist decision-making for maritime applications. 

Rutgers University operates such a system for shelf waters of the Mid-Atlantic Bight (MAB) and Gulf of Maine (GoM) where the MARACOOS and NERACOOS associations of U.S. IOOS operate coastal ocean observing systems that deliver a dense observation set using CODAR HF-radar, autonomous underwater glider vehicles (AUGV), telemetering moorings, and drifting buoys. Other U.S. national and global observing systems deliver further sustained observations from moorings, ships, profiling floats, and a constellation of satellites.

Our MAB/GoM re-analysis and forecast system uses the Regional Ocean Modeling System (ROMS; with 4-dimensional Variational (4DVAR) data assimilation to adjust initial conditions, boundary conditions, and surface forcing in each analysis cycle. Data routinely assimilated include CODAR velocities, altimeter satellite sea surface height (with coastal corrections), satellite temperature (microwave and infrared), in situ CTD data from AUGV and ships (NMFS Ecosystem Monitoring voyages), and all in situ data reported to the WMO GTS network. 

Using withheld observations, we examine system performance, and in comparison to other MAB real-time systems. 

Professor of Marine Sciences, Rutgers University, New Jersey, USA
Ph.D., 1988, Joint Program in Oceanographic Engineering, MIT/WHOI
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John Wilkin has 30 years of international experience in oceanography developing and applying model-based analysis systems for interdisciplinary research (nutrient and carbon cycling; larval dispersal; ocean forecasting) in coastal and adjacent boundary current waters. Most recently, these projects emphasize using variational methods for assimilation of in situ and remotely sensed observations, sensitivity and predictability analysis, and the design of observing networks. 

He is a developer of the Regional Ocean Modeling System (ROMS) and co-convenes the annual international ROMS User Workshops. 

Dr. Wilkin is a member of NASA’s Ocean Surface Topography Science Team and is active in the Coastal Altimetry community promoting uses of altimeter data in the coastal ocean. He co-chairs the UNESCO/IOC Global Ocean Observing System (GOOS) Ocean Observations panel for Physics and Climate (OOPC), chairs NASA’s Physical Oceanography Distributed Active Archive Center (PO.DAAC) User Working Group, and chaired the 2015 Gordon Research Conference on Coastal Ocean Modeling. 

As Director of the Rutgers University Graduate Program in Oceanography, Dr. Wilkin oversees the academic progress of PhD and MS students across all sub-disciplines of marine science. He teaches undergraduate and graduate courses in Dynamics of Marine Ecosystems, Remote Sensing of the Ocean and Atmosphere, Geophysical Data Analysis, and Coastal Ocean Dynamics, and participates in international summer schools training early career scientists on developments in modern coastal ocean observing systems and the interface between observing, modeling and ecosystems.