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Author Belyaev, K.P.; Tanajura, C.A.S.; O'Brien, J.J.
Title A data assimilation method used with an ocean circulation model and its application to the tropical Atlantic Type $loc['typeJournal Article']
Year 2001 Publication Applied Mathematical Modelling Abbreviated Journal Applied Mathematical Modelling
Volume 25 Issue 8 Pages 655-670
Keywords Data assimilation Fokker–Planck equation NOAA/GFDL MOM_2 ocean circulation model PIRATA project
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Publisher Place of Publication Editor
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Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0307904X ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 819
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Author Cintra, R.; Campos Velho, H.; Cocke, S.
Title Multilayer Perceptron on data assimilation system applied to FSU global model Type $loc['typeConference Article']
Year 2016 Publication Abbreviated Journal
Volume Issue Pages
Keywords data assimilation; artificial neural networks; numerical weather prediction; inverse problem
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Area Expedition Conference 3rd International Symposium on Uncertainty Quantification and Stochastic Modeling Maresias, Brazil: 15/2/2016 to 19/2/2016
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 88
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Author Cocke, S.; Boisserie, M.; Shin, D.-W.
Title A coupled soil moisture initialization scheme for the FSU/COAPS climate model Type $loc['typeJournal Article']
Year 2013 Publication Inverse Problems in Science and Engineering Abbreviated Journal Inverse Problems in Science and Engineering
Volume 21 Issue 3 Pages 420-437
Keywords soil moisture initialization; data assimilation; precipitation assimilation; nudging; reanalysis
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Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1741-5977 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 199
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Author Jacob, J. C.; Armstrong, E. M.; Bourassa, M. A.; Cram, T.; Elya, J. L.; Greguska, F. R., III; Huang, T.; Ji, Z.; Jiang, Y.; Li, Y.; McGibbney, L. J.; Quach, N.; Smith, S. R.; Tsontos, V. M.; Wilson, B. D.; Worley, S. J.; Yang, C. P.
Title OceanWorks: Enabling Interactive Oceanographic Analysis in the Cloud with Multivariate Data Type $loc['typeAbstract']
Year 2018 Publication American Geophysical Union Abbreviated Journal AGU
Volume Fall Meeting Issue Pages
Keywords 910 Data assimilation, integration and fusion, INFORMATICSDE: 1916 Data and information discovery, INFORMATICSDE: 1926 Geospatial, INFORMATICSDE: 1942 Machine learning, INFORMATICS
Abstract NASA's Advanced Information System Technology (AIST) Program sponsors the OceanWorks project to establish an integrated data analytics center at the Physical Oceanography Distributed Active Archive Center (PO.DAAC). OceanWorks provides a series of interoperable capabilities that are essential for cloud-scale oceanographic research. These include big data analytics, data search with subsecond response, intelligent ranking of search results, subsetting based on data quality metrics, and rapid spatiotemporal matchup of satellite measurements with distributed in situ data. The software behind OceanWorks is being developed as an open source project in the Apache Incubator Science Data Analytics Platform (SDAP – http://sdap.apache.org). In this presentation we describe how OceanWorks enables efficient, scalable, interactive and interdisciplinary oceanographic analysis with multivariate data.

Interactivity is enabled by a number of SDAP features. First, SDAP provides Representational State Transfer (REST) interfaces to a number of built-in cloud analytics to compute time series, time-averaged maps, correlation maps, climatological maps, Hovmöller maps, and more. To access these, users simply navigate to a properly constructed parameterized URL in their web browser or issue web services calls in a variety of programming languages or in a Jupyter notebook. Alternatively, Python clients can make function calls via the NEXUS Command Line Interface (CLI). Authenticated users can even inject their own custom code via REST calls or the CLI.

To enable interdisciplinary science, OceanWorks provides access to a rich collection of multivariate satellite and in situ measurements of the oceans (e.g., sea surface temperature, height and salinity, chlorophyll and circulation) and other Earth science data (e.g., aerosol optical depth and wind speed), coupled with on-demand processing capabilities close to the data. We partition the data across space or time into tiles and store them into cloud-aware databases that are collocated with the computations. We will provide examples of scientific studies directly enabled by OceanWorks' multivariate data and cloud analytics.
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Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ user @ Serial 1005
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Author Jardak, M.; Navon, I.M.; Zupanski, M.
Title Comparison of sequential data assimilation methods for the Kuramoto-Sivashinsky equation Type $loc['typeJournal Article']
Year 2009 Publication International Journal for Numerical Methods in Fluids Abbreviated Journal Int. J. Numer. Meth. Fluids
Volume Issue Pages
Keywords sequential data assimilation; ensemble Kalman filter; particle filter; Kuramoto–Sivashinsky equation
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0271-2091 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 375
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Author Perrie, W.; Zhang, W.; Bourassa, M.; Shen, H.; Vachon, P.W.
Title Impact of Satellite Winds on Marine Wind Simulations Type $loc['typeJournal Article']
Year 2008 Publication Weather and Forecasting Abbreviated Journal Wea. Forecasting
Volume 23 Issue 2 Pages 290-303
Keywords Satellite observations; Data assimilation; Hurricanes; Waves, oceanic; Ocean modeling; Numerical analysis
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0882-8156 ISBN Medium
Area Expedition Conference
Funding NASA, OVWST Approved $loc['no']
Call Number COAPS @ mfield @ Serial 680
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Author Smedstad, O.M.; Hurlburt, H.E.; Metzger, E.J.; Rhodes, R.C.; Shriver, J.F.; Wallcraft, A.J.; Kara, A.B.
Title An operational Eddy resolving 1/16° global ocean nowcast/forecast system Type $loc['typeJournal Article']
Year 2003 Publication Journal of Marine Systems Abbreviated Journal Journal of Marine Systems
Volume 40-41 Issue Pages 341-361
Keywords global ocean prediction; prediction of mesoscale variability; data assimilation; ocean forecast verification
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0924-7963 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 481
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Author Srinivasan, A.; Chassignet, E.P.; Bertino, L.; Brankart, J.M.; Brasseur, P.; Chin, T.M.; Counillon, F.; Cummings, J.A.; Mariano, A.J.; Smedstad, O.M.; Thacker, W.C.
Title A comparison of sequential assimilation schemes for ocean prediction with the HYbrid Coordinate Ocean Model (HYCOM): Twin experiments with static forecast error covariances Type $loc['typeJournal Article']
Year 2011 Publication Ocean Modelling Abbreviated Journal Ocean Modelling
Volume 37 Issue 3-4 Pages 85-111
Keywords Data assimilation; Ocean modeling; Ocean prediction; Twin experiments; Sequential assimilation; MVOI; EnOI; SEEK; ROIF; EnROIF
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1463-5003 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 320
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Author Yu, P
Title Development of New Techniques for Assimilating Satellite Altimetry Data into Ocean Models Type $loc['typeManuscript']
Year 2006 Publication Abbreviated Journal
Volume Issue Pages
Keywords Data Assimilation, Reduced Space, First Baroclinic Mode, Ocean Models, Vertical Normal Mode Decomposition, Variational
Abstract State of the art fully three-dimensional ocean models are very computationally expensive and their adjoints are even more resource intensive. However, many features of interest are approximated by the first baroclinic mode over much of the ocean, especially in the lower and mid latitude regions. Based on this dynamical feature, a new type of data assimilation scheme to assimilate sea surface height (SSH) data, a reduced-space adjoint technique, is developed and implemented with a three-dimensional model using vertical normal mode decomposition. The technique is tested with the Navy Coastal Ocean Model (NCOM) configured to simulate the Gulf of Mexico. The assimilation procedure works by minimizing the cost function, which generalizes the misfit between the observations and their counterpart model variables. The “forward” model is integrated for the period during which the data are assimilated. Vertical normal mode decomposition retrieves the first baroclinic mode, and the data misfit between the model outputs and observations is calculated. Adjoint equations based on a one-active-layer reduced gravity model, which approximates the first baroclinic mode, are integrated backward in time to get the gradient of the cost function with respect to the control variables (velocity and SSH of the first baroclinic mode). The gradient is input to an optimization algorithm (the limited memory Broyden-Fletcher-Goldfarb-Shanno (BFGS) method is used for the cases presented here) to determine the new first baroclinic mode velocity and SSH fields, which are used to update the forward model variables at the initial time. Two main issues in the area of ocean data assimilation are addressed: 1. How can information provided only at the sea surface be transferred dynamically into deep layers? 2. How can information provided only locally, in limited oceanic regions, be horizontally transferred to ocean areas far away from the data-dense regions, but dynamically connected to it? The first problem is solved by the use of vertical normal mode decomposition, through which the vertical dependence of model variables is obtained. Analyses show that the first baroclinic mode SSH represents the full SSH field very closely in the model test domain, with a correlation of 93% in one of the experiments. One common way to solve the second issue is to lengthen the assimilation window in order to allow the dynamic model to propagate information to the data-sparse regions. However, this dramatically increases the computational cost, since many oceanic features move very slowly. An alternative solution to this is developed using a mapping method based on complex empirical orthogonal functions (EOF), which utilizes data from a much longer period than the assimilation cycle and deals with the information in space and time simultaneously. This method is applied to map satellite altimeter data from the ground track observation locations and times onto a regular spatial and temporal grid. Three different experiments are designed for testing the assimilation technique: two experiments assimilate SSH data produced from a model run to evaluate the method, and in the last experiment the technique is applied to TOPEX/Poseidon and Jason-1 altimeter data. The assimilation procedure converges in all experiments and reduces the error in the model fields. Since the adjoint, or “backward”, model is two-dimensional, the method is much more computationally efficient than if it were to use a fully three-dimensional backward model.
Address Department of Oceanography
Corporate Author Thesis $loc['Ph.D. thesis']
Publisher Florida State University Place of Publication Tallahassee, FL Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Funding NSF, ONR, NASA Approved $loc['no']
Call Number COAPS @ mfield @ Serial 589
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Author Yu, P.; Morey, S.L.; O'Brien, J.J.
Title A reduced-dynamics variational approach for the assimilation of altimeter data into eddy-resolving ocean models Type $loc['typeJournal Article']
Year 2009 Publication Ocean Modelling Abbreviated Journal Ocean Modelling
Volume 27 Issue 3-4 Pages 215-229
Keywords Ocean modeling; Data assimilation; Variational adjoint methods
Abstract
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Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1463-5003 ISBN Medium
Area Expedition Conference
Funding Approved $loc['no']
Call Number COAPS @ mfield @ Serial 400
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