Application of Sensitivity Analysis Using an Adjoint Model for Short-Range Forecasts of the Kuroshio Path South of Japan

A sensitivity experiment has been performed by assimilating altimetric data into a 1.5-layer primitive equation model as a first attempt to examine the impact of initialization on forecasts of the Kuroshio path variability south of Japan. By exploiting the advantage of an adjoint model, our approach...

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Bibliographic Details
Published in:Journal of oceanography 2004-04, Vol.60 (2), p.293-301
Main Authors: Ishikawa, Yoichi, Awaji, Toshiyuki, Komori, Nobumasa, Toyoda, Takahiro
Format: Article
Language:English
Subjects:
Marine
Meteorology
Sensitivity analysis
Studies
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Summary:A sensitivity experiment has been performed by assimilating altimetric data into a 1.5-layer primitive equation model as a first attempt to examine the impact of initialization on forecasts of the Kuroshio path variability south of Japan. By exploiting the advantage of an adjoint model, our approach clearly shows that a small meander off Shikoku Island has a large impact on the prediction of meander growth in the Kuroshio region. Further, the strengthening of the Kuroshio Current and its recirculation clearly becomes an important factor in the development of the meander. These results demonstrate the effectiveness of our assimilation approach in identifying efficient initialization schemes on numerical forecasting of the Kuroshio south of Japan and should help in the construction of an effective observing system for improving the forecasting.
ISSN:0916-8370
1573-868X
DOI:10.1023/B:JOCE.0000038335.50080.ff