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Abstract

Our 4D-VAR data synthesis system is developed as a part of the Japan Agency for Marine-Earth Science and Technology (JAMSTEC)-Kyoto University collaborative program (known as "the K7 consortium"). The Ocean General Circulation Model is version 3 of the GFDL Modular Ocean Model (MOM3), which is equipped with several sophisticated schemes; e.g., Noh scheme for mixed layer physics, the Gent and McWilliams (GM) scheme for isopycnal mixing, and quicker advection scheme. The horizontal resolution is 1o in both latitude and longitude. In our original system, the OGCM has 45 vertical levels spaced from 10 m near the sea surface to 400 m at the bottom, with a bottom boundary layer. 4D-VAR adjoint data assimilation approach is applied to conduct data synthesis experiments. The adjoint codes of the OGCM were obtained using the Tangent linear and Adjoint Model Compiler (TAMC) and the Transformation of Algorithms in Fortran (TAF). In the 4D-VAR approach, optimized 4-dimensional datasets are sought by minimizing a cost function. Physical parameters: This system assimilates diverse observations such as subsurface temperature and salinity from EN4 dataset compiled by the Hadley Centre of the UK Meteorological Office, sea surface temperature (SST) from the Optimally Interpolated SST dataset and Extended Reconstructed SST dataset, and sea-surface dynamic-height anomaly data derived from high-precision multi-satellite altimetry products distributed by Aviso. The control variables are surface fluxes (for net-heat, fresh water, and momentum) and oceanic initial conditions. The assimilation window is more than 53 years from 1957. Biogeochemical parameters: The synthesis of available observations and a pelagic ecosystem model based on nitrogen cycle produces a dynamically self-consistent dataset. Optimized 4-dimensional datasets are sought by minimizing a cost function on the basis of Green's function approach. The assimilated elements include the climatological monthly mean nitrate from WOA, monthly mean ocean color data from SeaWiFS, annual mean chlorophyll-a from WOA98 as a pseudo-detritus, and BGC float observations. The detailed settings, such as the equipped model schemes, the assimilated elements, and the assimilation period, etc. depend on its version, and can be found on each version’s website.

Data Set Citation

Dataset Creator
Nozomi Sugiura
Dataset Title
Estimated State of Global Ocean for Climate Research
Dataset Release Date
2013-12-24
Other Citation Details
Please cite as: Masuda, S., T. Awaji, N. Sugiura, J. P.Matthews, T. Toyoda, Y.Kawai, T. Doi, S. Kouketsu, H. Igarashi, K. Katsumata, H. Uchida, T. Kawano, M. Fukasawa (2010), Simulated Rapid Warming of Abyssal North Pacific Waters, Science, 329, 319-322, DOI, 10.1126/science.1188703. Kouketsu, S. T. Doi, T. Kawano, S. Masuda, N. Sugiura, T. Toyoda, H. Igarashi, Y. Kawai, K. Katsumata, H. Uchida, M. Fukasawa, and T. Awaji (2011), Deep ocean heat content changes estimated from observation and reanalysis product and their influence on sea level change, J. Geophys. Res., 116, C03012, doi:10.1029/2010JC006464.
Persistent Identifier
Type
DOI
Identifier
10.17596/0000106

Personnel

Role
DIF AUTHOR
Contact
dmo@jamstec.go.jp (dmo@jamstec.go.jp)
Role
TECHNICAL CONTACT
Contact
Dataset Contact JAMSTEC (estoc-admin@jamstec.go.jp)

Keyword List

ISO Topic Category
GEOSCIENTIFIC INFORMATION
OCEANS
Parameter
EARTH SCIENCE>OCEANS>OCEAN TEMPERATURE>POTENTIAL TEMPERATURE
EARTH SCIENCE>OCEANS>SALINITY/DENSITY>SALINITY
EARTH SCIENCE>OCEANS>OCEAN CIRCULATION>OCEAN CURRENTS
EARTH SCIENCE>OCEANS>OCEAN CHEMISTRY
EARTH SCIENCE>OCEANS>MARINE GEOPHYSICS
Platform
MODELS
GCM>General Circulation Model
REANALYSIS MODELS
Other
4D-VAR Ocean Data Assimilation
JAMSTEC

Start Date - End Date

  • 1957-01-01 - 2011-12-31

Bounding Rectangle

South Bound
-75
North Bound
80
West Bound
-180
East Bound
180

Location

GEOGRAPHIC REGION>GLOBAL OCEAN

Data Resolution

Latitude Resolution
1 degree
Longitude Resolution
1 drgree
Vertical Resolution
46 levels

Project

Short Name
K7
Long Name
JAMSTEC-Kyoto University collaborative program

Language

ENGLISH
JAPANESE

Originating Center

JAMSTEC

Organization

Organization Type
ORIGINATOR
Organization Name
Short Name
JAMSTEC
Long Name
Japan Agency for Marine-Earth Science and Technology, Japan
Personnel
Role
DATA CENTER CONTACT
Contact
dmo@jamstec.go.jp (dmo@jamstec.go.jp)

Related URL

Description
Estimated State of Global Ocean for Climate Research - Home Page
Description
Estimated state of ocean for climate research (ESTOC) - Catalog Page

Last Metadata Revision Date

2022-11-18