WOCE 2002 |
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Seasonal-to-Interannual Variability of the Ocean During WOCE, Estimated by the ECCO Routine Global Ocean Data Assimilation System
WOCE and Beyond
San Antonio, Texas
November 18-22, 2002
Overview of ECCO near real-time data assimilation system and examples of its applications. The system consists of a hierarchy of assimilation methods that assimilate satellite sea surface height and in situ temperature profiles. Anayses are sensible and provide a means to study ocean circulation. Results are also used in geodetic studies. |
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An Open-Circuit and a Short-Circuit in the Pacific Ocean Subtropical-Tropical Exchange
WOCE and Beyond
San Antonio, Texas
November 18-22, 2002
Pathway of subtropical-tropical exchange in the Pacific Ocean is analyzed using a simulated passive tracer and its adjoint. Intra-seasonal variability short-circuits the meridional exchange. Contrary to the so-called "Subtropical Cell", the pathway of the exchange is an open circuit and does not close. |
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Interannual variation of mixed-layer heat balance: contrasting different climate phenomena and the roles of linear vs. nonlinear effects
WOCE and Beyond
San Antonio, Texas
November 18-22, 2002
Interannual variation of mixed-layer heat budget associated with the climate events of El Nino, IOD, and PDO phase switch during the period of 1997-2000 are examined using ECCO assimilation product. Similarity and difference in interannual mixed-layer heat balance for these events are discussed. The role of nonlinear vs. linear advective tendencies are addressed. |
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| Jason-1 2002 |
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Interannual Variation of Mixed-Layer Heat Balance
Jason-1 Science Working Team Meeting
New Orleans, Louisiana
October 21-23, 2002
The mixed-layer heat balance in key regions associated with events of El Nino, Indian Ocean Dipole, and the Pacific Decadal Oscillation are analyzed. Advection plays a similar role in the study regions. Differences in surface heat flux and diffusion is noted. Nonlinear advective tendencies are particularly important in El Nino. |
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| IGARSS 2002 |
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Mapping and Pseudo-Inverse Algorithms for Data Assimilation
International Geoscience & Remote Sensing Symposium
Toronto, Canada
June 24-28, 2002
Summary: Reduced-state Kalman filters require interpolation operators from the reduced state to the fine grid and pseudo-inverse operators that map the fine grid back to the reduced state. This poster investigates a variety of approaches to computing the pseudoinverse and evaluates the mapping performance of eleven interpolation kernels. |
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| GODAE 2002 |
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A Prototype GODAE Routine Global Ocean Data Assimilation System: ECCO-2
International Symposium "En Route to GODAE"
Biarritz, France
June 13-15, 2002
Summary: An overview of ECCO-2, a prototype routine global ocean data assimilation system of ECCO. The modeling and assimilation system are introduced and some of their applications are described. |
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Physical Consistency of Data Assimilated Estimates and the ECCO Hierarchical Assimilation Method
International Symposium "En Route to GODAE"
Biarritz, France
June 13-15, 2002
Summary: Temporal evolution of data assimilated solutions are physically inconsistent (e.g., non-closed energy budgets) when corresponding model errors are not determined. The nature of the inconsistency is described and its solution discussed. |
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Upper-ocean heat budget inferred from ECCO-2 ocean data assimilation
International Symposium "En Route to GODAE"
Biarritz, France
June 13-15, 2002
Summary: The ECCO-2 ocean data assimilation product is used to examine anomalous heat budget of the mixed layer in several areas associated with different climate variations (ENSO, Indian-Ocean Dipole, and PDO). Similarities and differences in heat budgets for the different climate variations are highlighted. |
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Callibrating the ECCO Ocean General Circulation Model Using Green's Functions
International Symposium "En Route to GODAE"
Biarritz, France
June 13-15, 2002
Summary: Green's functions provide a simple, yet effective, method to test and calibrate General-Circulation-Model (GCM) parameterizations, to study and quantify model and data errors, to correct model biases and trends, and to blend estimates from different solutions and data products. |
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| Jason-1 2002 |
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The Origin and Pathway of Nino3 Water Estimated Using Products of the ECCO Data Assimilation System
Jason-1 Science Working Team Meeting
Biarritz, France
June 10-12, 2002
Summary: The origin and pathway of water occupying the surface layer of the eastern Equatorial Pacific ("Nino3") are investigated using passive tracers and their adjoint based on circulation estimates of the ECCO Data Assimilation System ("ECCO-2"). |
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Interannual-to-decadal variation in tropical-subtropical mass exchange in the Pacific Ocean boundary vs interior pathways
Jason-1 Science Working Team Meeting
Biarritz, France
June 10-12, 2002
Summary: Interannual-to-decadal variation of tropical-subtropical mass exchange in the Pacific Ocean is investigated using sea level data, model simulation and assimilation. Anomaly of boundary pycnocline transport is found to be anti-correlated to and smaller in magnitude than that of the interior, which are different from the time-mean exchange. Forcing mechanisms are proposed to explain the variations. |
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| AGU 2001 |
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Application of an Ocean Model and its Adjoint for Global Data Assimilation and Sensitivity Analysis
AGU 2001 Fall Meeting
San Francisco, California
10-14 December 2001
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| Jason-1 2001 |
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The Three-Dimensional Circulation of the Ocean
Jason-1 Science Working Team Meeting
Solvang, California
6 December 2001
Summary: The poster is an introduction to our project and describes what data assimilation is about and what its applications are. Satellites provide the most extensive observation of the ocean but are limited to measuring properties of the sea surface. Data assimilation combines these observations with models and thereby extrapolates the measurements into complete descriptions of the ocean. Deep circulation is revealed and processes underlying observed changes are identified. Data assimilation helps improve our understanding of ocean circulation. These advancements also help improve understandings of biogeochemical cycles and changes in earth rotation. |
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| WOCE/JGOFS 2001 |
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Pacific and Indian Ocean Circulation During 1993-2000: Assimilation of TOPEX/Poseidon Data into a Near Global OGCM
WOCE/JGOFS Transport Workshop
Southampton, UK
25-29 June 2001
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| NASA OSC 2001 |
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Toward Operational Ocean State Estimation
NASA Oceanography Scientific Conference
Oceanology International Americas
Miami Beach, Florida
April 3-5, 2001
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Tropical Pacific and Indian Ocean Heat Balance Inferred by Assimilation TOPEX Dat into a Near-global OGCM
NASA Oceanography Scientific Conference
Oceanology International Americas
Miami Beach, Florida
April 3-5, 2001
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| TOPEX-JASON 2000 |
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Interannual Variability of the Indonesian Throughflow Transport Estimated from Wind Stress and Adjoint Sensitivity
TOPEX-JASON SWT meeting
Miami Beach, Florida
2000 |
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