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項次 書目
1
題名:Modified Eady Waves and Frontogenesis PartⅡ: Nonlinear Integration    
改造之Eady波與鋒生 第二部分 非?性積分
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:379-391
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

改造之Eady波在定切變及拋物線型之位溫剖面流體中的穩定性分析已在本文之第一部分中討論。在這一部分中我們將使用發展於普渡大學之非線性模式來研究由第一部分中所得之不穩定波演化過程。雖然因拋物線型之位溫剖面使高層大氣有較?之成層使得模擬出長波(在第一部分中以模Ⅰ相稱)擾動的振幅在接近高層時小於靠近底層。但是長波發展成鋒面後,其氣壓與溫度的最大擾動產生於模擬範圍內的最高或最低處;此結果與Williams和Hoskin對一般Eady波所討論的相似。至於短波(在第一部分中以模Ⅱ相稱)它需要較長的時間發展成鋒面,且被限制在低層大氣中發展。由模式所模擬的短波相速正如本文第一部分所預測之情形一樣比一般之斜壓波慢很多。 從穩定性分析及非線性積分皆證實了地面波/鋒面當低層大氣之成層微弱時,在幾天內可發展並達到有限的振幅。本文所得之結果可能與在冬天時發展於黑潮和東中國海之中尺度擾動有關。
The stability analysis of the modified Eady waves (Eady, 1949) in a constant shear flow with parabolic temperature profiles has been discussed in Part Ⅰ. Here, we apply the nonlinear model developed at Purdue University to study the evolution of those unstable waves obtained from Part Ⅰ.The long waves(referred to as Mode Ⅰ in Part Ⅰ)develop into fronts with the maximum perturbations of pressure and temperature being either at the top or at the bottom of the domain. They are similar to conventional Eady waves discussed by Williams (1967) and Hoskin (1978), although the amplitudes of the simulated perturbations near the top are smaller than those near the bottom, due to a stronger stratification in the upper atmosphere in our parabolic temperature profiles. The short waves(referred to as Mode Ⅱ in PartⅠ),which need more time to develop into a front, are confined to the lower atmosphere. The modeling phase speed of the short waves is much slower than the conventional baroclinic waves, as predicted in Part Ⅰ. Both stability analyses and nonlinear integrations confirm that the surface wave/front can develop and reach finite amplitude within a few days, when the stratification in the lower atmosphere is weak. The results of this study may be related to the development of the medium scale disturbances observed over the Kuroshio Current and East China Sea during the winter.


    

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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