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1
題名:Modified Eady Waves and Frontogenesis Part I: Linear Stability Analysis    
改造之Eady波與鋒生 第一部分 ?性穩定性之分析
著者:Wen-Yih Sun(商文義)
出版地區:台灣
出版城市:台北市
學科:地球科學
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:1卷4期(1990.12)
頁碼:363-377
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

斜壓不穩定性在-非黏滯性且位溫剖面?拋物線型之流體中將被研討。在上述狀況下,並無短波割離產生,此與傳統的Eady模式不同。除了長波擾動(與Eady波相似)之外,短波擾動亦可在成層較弱的低層中發展。短波之成長率會隨著成層隨高度增加而增加。從結果中顯示短波擾動可以穿透至高層的穩定層。這些波之成長率與擾動可能與有效的Burger數目有關,Burger數定義?(方程式略)其中h*?垂直熱通量(W'θ')最大處之高度而λ是水平的波長。 由本文第二部分中經由非線性中尺度模式之數值模擬中亦證實了短波在短短幾天內可以發展成一地面鋒,而這些短波可能就是對應於AMTEX實驗中所觀測到的中尺度擾動。
Baroclinic instability in an inviscid fluid with parabolic potential temperature profiles is investigated. Unlike the classical Eady model, there is no short wave cutoff. In addition to the longwave disturbances, which are similar to the Eady waves, shortwave disturbances can also develop in the lower atmosphere, where the stratification is weaker. The growth rate of the short waves increases with increasing stratification aloft. The results show that shortwave disturbances can penetrate into the upper stable layer. The growth rate and disturbances of those waves may be associated with an effective Burger number, which is defined as (The equation is abbreviated) where h*is the height of the maximum vertical heat flux (w'θ') and λ is the horizontal wavelength. Numerical simulations obtained from a nonlinear mesoscale model in Part Ⅱ also confirm that the short waves can develop into a surface front within a few days. Those short waves may correspond to the medium-scale disturbances observed over the AMTEX (Air Mass Transformation EXperiment) region.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 1卷4期 (1990.12)
Shallow Reflection Seismics Using Firecracker as the Source, I: Firecracker/ Dao-Tze TsaiChien-Ying WangRong-Kuan Yang
Momentum Budgets of a Subtropical Squall Line Determined from Dual-Doppler Data/ Yeong-Jer LinHsi ShenFang-Chen Cheng
Interannual Variations of Tropical Upper Tropospheric Divergence and Pacific Teleconnections During Northern Winter/ C. -P. Chang
Modified Eady Waves and Frontogenesis Part I: Linear Stability Analysis/ Wen-Yih Sun
Modified Eady Waves and Frontogenesis PartⅡ: Nonlinear Integration/ Wen-Yih Sun
 
   
 
   

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