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Four-dimensional Variational Ocean ReAnalysis for the Western North Pacific over 30 years (FORA-WNP30)

Four-dimensional Variational Ocean ReAnalysis for the Western North Pacific (FORA-WNP30) is the first-ever dataset covering the western North Pacific over the last three decades (1982-2014) at eddy-resolving resolution. This is the cooperative work of Japan Agency for Marine-Earth Science and Technology (JAMSTEC) and Meteorological Research Institude, Japan Meteorological Agency (JMA/MRI) using the Earth Simulator.

Details of the dataset are described in Dataset page.

Leaflet

Leaflet introducing FORA-WNP30 is available in English and in Japanese.

News

Feb. 22, 2016
New!!Results of FORA-WNP30 will be presented in the Ocean Science Meeting (see "Research Results").
Feb. 22, 2016
New!!The web page of FORA in English is disclosed publicly.
Jan, 20, 2016
Symposium on FORA dataset was held (circular).

Revision history

Feb. 22, 2016
Disclosure of English web page.
Jan. 29, 2016
Experimental disclosure of English web page.

Dataset

FORA-WNP30 was produced by using MRI Multivariate Ocean Variational Estimation system, version of 4-dimensional variational method (MOVE-4DVAR; Usui et al. 2015), the data assimilation system developed by the JMA/MRI. MOVE-4DVAR uses MRI.COM-WNP (Tsujino et al. 2006), eddy-resolving ocean model for Western North Pacific developed by JMA/MRI, as the forward model of ocean and sea ice.

The settings of the assimilation system are as follows:

  • Ocean and sea ice model
    • Domain: 117°E-160°W, 15°N-65°N
    • Horizontal resolution: 1/10° (1/6° east of 160°E) longitude × 1/10° (1/6° north of 50°N) latitude
    • Number of vertical levels: 54 levels (0-6300m)
  • Assimilation method
    • Ocean: 4-dimensional variational method
    • Sea ice: objective analysis by minimum variance estimation and nudging
    • Assimilation cycle: 3 cycles in a month (day 1 to 10, 11 to 20, 21 to the end of month in each month), sea ice is nudeged to the daily analysis.
  • Assimilated observation
    • In situ temperature and salinity profiles from WOD2013 and GTSPP (0-1500m)
    • Gridded SST made by merging satellite and in situ observations (MGDSST; Kurihara et al., 2006 [in Japanese])
    • SLA by satellites (TOPEX/Poseidon, Jason-1/2, ERS-1/2, Envisat, GFO, Cryosat)
    • SSM/I sea ice concentration data
  • Atmospheric forcing
    • daily-mean of JRA-55 (Kobayashi et al., 2015)
  • Analysis period
    • Jan. 1, 1982 to Dec. 31, 2014
  • Data format
    • NetCDF (based on CF-convention v1.6)
  • Variables
    Variable name Dimension Standard name*1 Units*2
    uo 3 sea_water_eastward_velocity cm s-1
    vo 3 sea_water_northward_velocity cm s-1
    to 3 sea_water_potential_temperature degreeC
    so 3 sea_water_practical_salinity psu
    ht 2 sea_surface_height_above_sea_level cm
    aice 2 sea_ice_area_fraction 1

    *1: Standard name of each variable is based on CF Standard Names.

    *2: Please refer to the variable attributes (units, scale_factor, add_offset) for detailed information in the data files.

Data Policy

Japan Agency for Marine-Earth Science and Technology (JAMSTEC) and Meteorological Research Institude, Japan Meteorological Agency (JMA/MRI) provide Four-dimensional variational Ocean ReAnalysis for the Western North Pacific (FORA-WNP30) as a basic ocean reanalysis dataset for research activities in ocean, climate and other related fields. The computational resources for the dataset is provided by the Earth Simulator in the Strategic Project with Special Support of JAMSTEC. The dataset is available under the terms and conditions and the constraints listed below.

Terms and Conditions

  1. The dataset is available for free for scientific and educational purposes. If you use the dataset, please contact JAMSTEC/CEIST by the email with

    • Your name and affiliation,
    • Contact email address,
    • The purpose of the use of the dataset,
    • The period of the dataset you need.

    If you wish to use the dataset for non-scientific or non-educational purposes, please inform us in advance and follow our instructions.

  2. The source of the dataset should be accordingly acknowledged and the article below should also be referred in scientific or technical papers, publications, press releases or other communications regarding the dataset.

    Usui et al., 2016, Four-dimensional Variational Ocean Reanalysis: A 30-year high-resolution dataset in the western North Pacific (FORA-WNP30). J. Oceanogr., submitted.

    Example of the citation format
    This study utilized the dataset ‘Four-dimensional Variational Ocean Reanalysis for the western North Pacific’ (FORA-WNP30), which was produced by Japan Agency for Marine-Earth Science and Technology (JAMSTEC) and Meteorological Research Institute of Japan Meteorological Agency (JMA/MRI).
  3. Users should provide JAMSTEC/CEIST a copy or URI of their scientific or technical papers, publications, press releases or other communications regarding the dataset.
  4. Users are not permitted to redistribute, deliver, or sell the dataset to public.
Contact:
Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology
Address
3173-25, Showa-machi, Kanazawa-ku, Yokohama, Kanagawa, 236-0001, Japan
E-mail
Mail address

Constraints and Disclaimer

  1. The copyright and intellectual property right of the dataset belong to JAMSTEC and JMA/MRI. Please note that although JAMSTEC and JMA/MRI have paid the close attention to produce the dataset, JAMSTEC and JMA/MRI assume no responsibility regarding the reliability of the dataset.
  2. JAMSTEC and JMA/MRI are not responsible to users for any damage that may be caused by the use of the dataset.

Other Remarks

FORA-WNP30 will be provided via DIAS by the end of FY2015.

Research Results

List for domestic meetings are only on Japanese site.

Articles with peer review

Four-dimensional Variational Ocean Reanalysis: A 30-year high-resolution dataset in the western North Pacific (FORA-WNP30).

Usui, N., T. Wakamatsu, Y. Tanaka, N. Hirose, T. Toyoda, S. Nishikawa, Y. Fujii, Y. Takatsuki, H. Igarashi, H. Nishikawa, Y. Ishikawa, T. Kuragano and M. Kamachi,

Journal of Oceanography (submitted).

Oral presentations

Coming Soon!!"Mechanism of interannual to decadal sea level variability along the Japanese coast",
Usui et al., 2016 Ocean Sciences Meeting (New Orleans, USA; Feb. 26, 2016)
Coming Soon!!"Pathway of the Kuroshio water traveling to the Bering Sea in a western North Pacific eddy-resolving model analyzed with the tangent linear and adjoint models",
Fujii et al., 2016 Ocean Sciences Meeting (New Orleans, USA; Feb. 25, 2016)
"Observability of long term Kuroshio variability through four dimensional ocean data assimilation",
Wakamatsu et al., CLIVAR Kuroshio workshop 2016(Yokohama, Japan; Jan. 12, 2016)
"Monitoring and Prediction of the Kuroshio System: Recent Developments of Model and Data Assimilation System at JMA/MRI",
Kamachi et al., 6th Annual Meeting of the GODAE Ocean View Science Team, Science Session - (Western) Boundary Current - (Sidney, Australia; Nov. 5, 2015)
"Relationships between ocean conditions and interannual variability of habitat suitability index (HSI) distribution for neon flying squid in central North Pacific examined using new 4D-VAR ocean reanalysis dataset",
Igarashi et al., PICES annual meeting(Qingdao, China; Oct. 22, 2015)
"Development of a four-dimensional variational assimilation system in the western North Pacific",
Usui et al., 1st GODAE OceanView Data Assimilation Task Team (DA-TT) Workshop (Exeter, UK; May 20, 2015)

Poster presentations

Coming Soon!!"Four dimensional variational reanalysis of the Western North Pacific Ocean - system configuration, performance and validation",
Wakamatsu et al., 2016 Ocean Sciences Meeting (New Orleans, USA; Feb. 26, 2016)
Coming Soon!!"Operational Prediction of the Habitat Suitability Index (HSI) Distribution for Neon Flying Squid in Central North Pacific by Using FORA Dataset and a New Data Assimilation System SKUIDS",
Igarashi et al., 2016 Ocean Sciences Meeting (New Orleans, USA; Feb. 22, 2016)
Coming Soon!!"Relationship between upper ocean heat content in the Japan Sea and volume transport through the Tsushima Strait",
Hirose et al., 2016 Ocean Sciences Meeting (New Orleans, USA; Feb. 24, 2016)
"Long term, high-resolution ocean reanalysis of the Western North Pacific Ocean",
Wakamatsu et al., PICES annual meeting (Qingdao, China; Oct. 22, 2015)

(Last updated on Jan. 6, 2016.)

Frequently Asked Questions

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