Ensemble numerical forecasts of the sporadic Kuroshio water intrusion (kyucho) into shelf and coastal waters

Atsuhiko Isobe, Shin'Ichiro Kako, Xinyu Guo, Hidetaka Takeoka

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The finite volume coastal ocean model downscal-ing ocean reanalysis and forecast data provided by the Japan Coastal Ocean Predictability Experiment (JCOPE2) are used to forecast sudden Kuroshio water intrusion events (kyucho) induced by frontal waves amplified south of the Bungo Channel in 2010. Two-month hindcast computations give initial conditions of the following 3-month forecasts computations which consist of ten ensemble members. The temperature time series computed by these ten members are averaged to compare with that actually observed in the Bungo Channel, where sudden temperature rises related to kyucho events are remarkable in February, August, and September. Overall, the intense kyucho events actually observed in these months are predicted successfully. However, intense kyucho events are forecasted frequently during the period of May through June even though intense kyucho events are absent during this period in the actual ocean. It is suggested that the present downscaling forecast model requires reliable lateral boundary conditions provided by JCOPE2 data to which numerous Argo data are assimilated to enhance the accuracy. In addition, it seems likely that the model accuracy is reduced by small eddies moving along the shelf break.

Original languageEnglish
Pages (from-to)633-644
Number of pages12
JournalOcean Dynamics
Volume62
Issue number4
DOIs
Publication statusPublished - Apr 1 2012
Externally publishedYes

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coastal water
ocean
water
Argo
downscaling
shelf break
eddy
boundary condition
temperature
time series
forecast
experiment

All Science Journal Classification (ASJC) codes

  • Oceanography

Cite this

Ensemble numerical forecasts of the sporadic Kuroshio water intrusion (kyucho) into shelf and coastal waters. / Isobe, Atsuhiko; Kako, Shin'Ichiro; Guo, Xinyu; Takeoka, Hidetaka.

In: Ocean Dynamics, Vol. 62, No. 4, 01.04.2012, p. 633-644.

Research output: Contribution to journalArticle

Isobe, Atsuhiko ; Kako, Shin'Ichiro ; Guo, Xinyu ; Takeoka, Hidetaka. / Ensemble numerical forecasts of the sporadic Kuroshio water intrusion (kyucho) into shelf and coastal waters. In: Ocean Dynamics. 2012 ; Vol. 62, No. 4. pp. 633-644.
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