| 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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