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Geoscientific Model Development An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/gmd-2019-351
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gmd-2019-351
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: model evaluation paper 03 Feb 2020

Submitted as: model evaluation paper | 03 Feb 2020

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This preprint is currently under review for the journal GMD.

A global eddying hindcast ocean simulation with OFES2

Hideharu Sasaki1, Shinichiro Kida2,1, Ryo Furue1, Hidenori Aiki3,1, Nobumasa Komori1, Yukio Masumoto4,1, Toru Miyama1, Masami Nonaka1, Yoshikazu Sasai5, and Bunmei Taguchi6,1 Hideharu Sasaki et al.
  • 1Application Laboratory, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • 2Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
  • 3Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
  • 4Graduate School of Science, The University of Tokyo, Tokyo, Japan
  • 5Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
  • 6Faculty of Sustainable Design, University of Toyama, Toyama, Japan

Abstract. A quasi-global eddying ocean hindcast simulation using a new version of our model called OFES2 (Ocean General Circulation Model for the Earth Simulator version 2) was conducted to overcome several issues with unrealistic properties in its previous version OFES. This paper describes the model and the simulated oceanic fields in OFES2 compared with OFES and also observed data. A sea-ice model and a tidal mixing scheme were implemented in OFES2, which was forced by a newly created surface atmospheric dataset called JRA55-do and simulated the oceanic fields from 1958 to 2016. We found several improvements in OFES2 over OFES: smaller biases in the global sea surface temperature and sea surface salinity and the water properties in the Indonesian and Arabian Seas. The time series of the Niño3.4 and Indian Ocean Dipole (IOD) indexes are somewhat better in OFES2 than in OFES. Unlike the previous version, OFES2 reproduces more realistic anomalous low sea surface temperatures during a positive IOD event. One possible cause for these improvements in El Niño and IOD events is the replacement of the atmospheric dataset. On the other hand, several issues remained unrealistic, such as the pathways of the Kuroshio and Gulf Stream and the unrealistic spreading of salty Mediterranean overflow. Given the worldwide use of the previous version and the improvements presented here on it, the output from OFES2 will be useful in studying various oceanic phenomena with broad spatiotemporal scales.

Hideharu Sasaki et al.

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Status: open (until 30 Mar 2020)
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Hideharu Sasaki et al.

Data sets

JAMSTEC OFES DATASET JAMSTEC https://doi.org/10.17596/0002029

Hideharu Sasaki et al.

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Latest update: 28 Feb 2020
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Short summary
A quasi-global eddying ocean hindcast simulation using our new model OFES2 was conducted. We found several improvements over the previous model: smaller biases in the global sea surface temperature and salinity, the water properties in the Indonesian and Arabian Seas, the sea surface temperature anomaly during the Indian Ocean Dipole events. However, several issues remained unrealistic: the pathways of the Kuroshio and Gulf Stream and the spreading of salty Mediterranean overflow.
A quasi-global eddying ocean hindcast simulation using our new model OFES2 was conducted. We...
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