Ocean Data Assimilation for Coupled Models

2002 ◽  
Author(s):  
Patricia A. Phoebus ◽  
James A. Cummings
Keyword(s):  
Data Assimilation ◽  
Coupled Models ◽  
Ocean Data Assimilation

Ocean Data Assimilation for Coupled Models

2001 ◽  
Author(s):  
Patricia A. Phoebus ◽  
James A. Cummings
Keyword(s):  
Data Assimilation ◽  
Coupled Models ◽  
Ocean Data Assimilation

Ocean Data Assimilation for Coupled Models

1999 ◽  
Author(s):  
Patricia A. Phoebus ◽  
James A. Cummings
Keyword(s):  
Data Assimilation ◽  
Coupled Models ◽  
Ocean Data Assimilation

Open Ocean Data Assimilation

2002 ◽  
Author(s):  
Andrew F. Bennett
Keyword(s):  
Data Assimilation ◽  
Open Ocean ◽  
Ocean Data Assimilation

Balanced Ocean-Data Assimilation near the Equator

2002 ◽  
Vol 32 (9) ◽  
pp. 2509-2519 ◽  
Author(s):  
Gerrit Burgers ◽  
Magdalena A. Balmaseda ◽  
Femke C. Vossepoel ◽  
Geert Jan van Oldenborgh ◽  
Peter Jan van Leeuwen
Keyword(s):  
Data Assimilation ◽  
Shallow Water ◽  
General Circulation ◽  
General Circulation Models ◽  
Density Field ◽  
Water Model ◽  
Optimal Interpolation ◽  
Shallow Water Model ◽  
Ocean Data Assimilation ◽  
Zonal Velocity

Abstract The question is addressed whether using unbalanced updates in ocean-data assimilation schemes for seasonal forecasting systems can result in a relatively poor simulation of zonal currents. An assimilation scheme, where temperature observations are used for updating only the density field, is compared to a scheme where updates of density field and zonal velocities are related by geostrophic balance. This is done for an equatorial linear shallow-water model. It is found that equatorial zonal velocities can be detoriated if velocity is not updated in the assimilation procedure. Adding balanced updates to the zonal velocity is shown to be a simple remedy for the shallow-water model. Next, optimal interpolation (OI) schemes with balanced updates of the zonal velocity are implemented in two ocean general circulation models. First tests indicate a beneficial impact on equatorial upper-ocean zonal currents.

scholarly journals GODAE: The Global Ocean Data Assimilation Experiment

Oceanography ◽  
2009 ◽  
Vol 22 (3) ◽  
pp. 14-21 ◽  
Author(s):  
Michael Bell ◽  
Michel Lefèbvre ◽  
Pierre-Yves Le Traon ◽  
Neville Smith ◽  
Kirsten Wilmer-Becker
Keyword(s):  
Data Assimilation ◽  
Global Ocean ◽  
Assimilation Experiment ◽  
Ocean Data Assimilation

scholarly journals Optimal Spectral Decomposition (OSD) for Ocean Data Assimilation

2015 ◽  
Vol 32 (4) ◽  
pp. 828-841 ◽  
Author(s):  
Peter C. Chu ◽  
Robin T. Tokmakian ◽  
Chenwu Fan ◽  
L. Charles Sun
Keyword(s):  
Data Assimilation ◽  
Spectral Decomposition ◽  
Basis Functions ◽  
Laplacian Operator ◽  
Generalized Fourier Series ◽  
Ocean Data Assimilation ◽  
Linear Algebraic Equations ◽  
Spectral Coefficients ◽  
Optimal Mode ◽  
Mode Truncation

AbstractOptimal spectral decomposition (OSD) is applied to ocean data assimilation with variable (temperature, salinity, or velocity) anomalies (relative to background or modeled values) decomposed into generalized Fourier series, such that any anomaly is represented by a linear combination of products of basis functions and corresponding spectral coefficients. It has three steps: 1) determination of the basis functions, 2) optimal mode truncation, and 3) update of the spectral coefficients from innovation (observational increment). The basis functions, depending only on the topography of the ocean basin, are the eigenvectors of the Laplacian operator with the same lateral boundary conditions as the assimilated variable anomalies. The Vapnik–Chervonkis dimension is used to determine the optimal mode truncation. After that, the model field updates due to innovation through solving a set of a linear algebraic equations of the spectral coefficients. The strength and weakness of the OSD method are demonstrated through a twin experiment using the Parallel Ocean Program (POP) model.

Consistency and fidelity of Indonesian-throughflow total volume transport estimated by 14 ocean data assimilation products

2010 ◽  
Vol 50 (2) ◽  
pp. 201-223 ◽  
Author(s):  
Tong Lee ◽  
Toshiyuki Awaji ◽  
Magdalena Balmaseda ◽  
Nicolas Ferry ◽  
Yosuke Fujii ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Volume Transport ◽  
Indonesian Throughflow ◽  
Ocean Data Assimilation
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