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題 名 | A Case Study of Polar Low Over the Japan Sea--Part Two: The Numerical Simulation=日本海極地低壓的個例研究2.數值模擬 |
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作 者 | 傅剛; 劉秦玉; 新野宏; 木村龍治; 吳增茂; | 書刊名 | 臺灣海洋學刊 |
卷 期 | 37:1 1998.06[民87.06] |
頁 次 | 頁61-75 |
分類號 | 328.3 |
關鍵詞 | 極地低壓; 日本譜模式; 數值模擬; 類CISK過程; Polar lows; Japan spectral model; Numerical simulation; CISK-like process; |
語 文 | 英文(English) |
中文摘要 | 在給出了1996年2月26日發生在日本海上的一個極地低壓的典型個例的分析結果之 後,本文利用有限區域日本譜模式(JSM)模擬了該極地低壓的發展過程。根據模式輸出的詳 細結果,該極地低壓的演變過程可分成初始和成熟兩個階段來討論。初始階段,該極地低壓 生成於大氣的斜壓區。PV的分析顯示上層的PV異常會加強低層的氣旋式環流。在成熟階段, 來自日本海暖水域的熱通量使低層大氣不穩定。由於低壓輻合會產成垂直對流,並釋放凝結 潛熱。這種類CISK過程是極地低壓進一步發展的機制。 |
英文摘要 | Following the results of the analysis of a typical polar low event that occurred on February 26, 1996 over the Japan Sea, the JSM(Japan Spectral Model) was used to simulate the development of this polar low event. Based on the detailed JSM outputs, the evolution and structure of this polar low is discussed in two stages, corresponding to the initial and mature stages. At the initial stage, the polar low generates in a baroclinic zone. In addition, the PV (Potential Vorticity) analysis indicates that an approaching upper-level PV anomaly later intensified the low-level cyclonic circulation. At the mature stage, strong sea surface fluxes from the relatively warm waters of the Japan Sea give rise to the instability of the low-level. Consequently, the vertical convection occurs due to the low-level convergence and the release of latent heat takes place through the convection. The CISK-like process supplies a mechanism for further development of the polar low. The analysis of vorticity indicates that the Changbai Mountain provides the positive vorticity contribution to the polar low. |
本系統中英文摘要資訊取自各篇刊載內容。