Formation factors of 2004 Niigata‐Fukushima and Fukui heavy rainfalls and problems in the predictions using a cloud‐resolving model

DOI Web Site 被引用文献43件 参考文献5件 オープンアクセス

書誌事項

タイトル別名
  • Formation Factors of 2004 Niigata-Fukushima and Fukui Heavy Rainfalls and Problems in the Predictions using a Cloud-Resolving Model
公開日
2005
DOI
  • 10.2151/sola.2005-001
公開者
公益社団法人 日本気象学会

説明

Localized, band-shaped heavy rainfall was observed over the Niigata-Fukushima area on July 13th 2004 and the over Fukui area on July 18th 2004. Both areas are located on the Japan-Sea side of the Japan Islands. These heavy rainfall events were a result of an intensification of convective instability over the Baiu frontal zone, induced by the inflows of low-level humid air and middle-level dry air. The middle-level air was considerably warm, not colder than the surrounding air. This indicates that the formation factors of heavy rainfall should be examined using convective instability, rather than potential instability.<BR>Numerical simulations using a cloud-resolving model with a horizontal grid of 1.5 km were carried out in an attempt to reproduce these heavy rainfall events. The Niigata-Fukushima heavy rainfall was reproduced well, while the Fukui heavy rainfall was not. This failure of the Fukui case could be the result of the uncertain analysis of the wind field over the Sea of Japan that determined the movement of low-level humid air. edevelopment of new observation systems over the sea, where upper-air sounding is seldom operated, are required to improve heavy rainfall predictions and to prevent such failures.

収録刊行物

  • SOLA

    SOLA 1 (0), 1-4, 2005

    公益社団法人 日本気象学会

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