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項次 書目
1
題名:Vertical Wind Shear Effects on Kelvin Wave-CISK Modes: Possible Relevance to 30~60 Day Oscillations    
垂直風切對Kelvin Wave-CISK的影響:與30~60天振盪的可能關係
著者:C.-P. Chang(張智北)
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:2卷3期(1991.9)
頁碼:203-216
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

有些數值模擬(Hayashi and Sumi, 1986; Lau and Peng, 1987)的結果中發現有向東傳送的赤道擾動,其若幹性質與觀測到的30~60天振蕩相似。Lau and Peng (1987)及Chang and Lim (1988)曾建議Kelvin Wave-CISK可能是此類模擬之擾動的發展機制。但是KWC理論上和模式中的擾動都比觀測的擾動傳送速度?快。本文主要目的的探討平均風場造成的都卜勒效應可否足以減慢理論上KWC的傳送速度,並同時研究垂直向平均風節對穩定度的影響。本文使用我們(Lim et al., 1990)的模式及求解方法,加上的氣壓坐標內的線性垂直平均風切。結果顯示西風風切會增加KWC波的穩定度,東風風切則減少其穩定度。波傳送的速度確會受到平均風的都卜勒效應,但影響程度約?垂直平均的60~70%。根據赤道地區氣候平均風資料,我們計算出在不同經度KWC波的傳送速度和不穩定成長率,結果顯示KWC波用約35~40天環繞赤道一週,此周期已在觀測的範圍之內。波的成長率在印度洋和西太平洋最大,這些也是觀測到的擾動對流經常增長的區域。
Several numerical model simulations (Hayashi and Sumi, 1986; Lau and Peng, 1987) reported generation of eastward propagating equatorial disturbances which appear to be model analogs of the observed 30~60 day oscillations. Kelvin wave CISK has been proposed as a possible mechanism for driving these simulated disturbances (Lau and Peng, 1987; Chang and Lim, 1988). However, model and theoretical wave-CISK disturbances all propagate faster than the observed oscillations. In this paper, we investigate whether the "Doppler shifting" effect by a mean wind may adequately slow down the wave-CISK modes. In addition, the effect of vertical mean wind shear on their stability is also studied. The model and solution methods of this paper is adopted from Lim et at. (1990). Mean winds with a linear shear in the pressure coordinate are considered. It is found that a westerly shear tends to stabilize the Kelvin wave-CISK modes while an easterly shear tends to enhance their instability. The wave-CISK modes are "Doppler shifted" by the mean winds, but to only about 60~70% of the vertical-averaged mean wind speed. Based on the climatological equatorial mean winds, growth rate and propagation speed of the Kelvin wave-CISK modes are estimated for various longitudes. With the mean wind effect, the Kelvin wave-CISK modes take about 35-s40 days to travel around the equatorial belt. Their growth rate is largest over the Indian Ocean and western Pacific Ocean where increased activity of convective clouds associated with the oscillations are often reported.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 2卷3期 (1991.9)
Shallow Reflection Seismics Using Firecrackers as the SourceⅡ: Field Experiments/ Chien-Ying WangRong-Kuan YangDao-Tze Tsai
Characteristics of Strong Motion Durations in the SMART1 Array Area/ Kuo-Liang WenYeong-Tein Yeh
Vertical Wind Shear Effects on Kelvin Wave-CISK Modes: Possible Relevance to 30~60 Day Oscillations/ C.-P. Chang
Observational Study of a Multiple Microburst-Producing Storm Part Ⅲ: Vorticity Budgets/ Yeong-Jer Lin
Pb-210 and Po-210 Distributions and Their Radioactive Disequilibria in the Kuroshio Waters off Eastern and Northeastern Taiwan/ Y. N. LinY. Chung
Geochemical and Stable Isotopic Studies of Celebes and Sulu Sea Sediments: Sites 767 and 768, ODP Leg 124/ Der-Duen Sheu
 
   
 
   

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