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dvd臺灣農村規劃的在地美臺灣獵鹿季節
   
   
   
     
   
 
項次 書目
1
題名:Diurnal Oscillation of the Convective Boundary Layer Part 2: Cloudy Atmosphere    
對流邊界層之日夜變化:第二部分 有雲大氣
著者:Ching-Chi Wu(吳清吉) ;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2期(1990.6)
頁碼:157-174
語言:英語
摘要: 中文摘要PDF ; 英文摘要PDF

一個簡單的一維總體平均邊界層模式,用以研究有雲大氣時邊界層的演化。模式中包含凝結、蒸發、大氣輻射和地表能量收支。紊流動能(E)是由預報方程得到。此外,強迫恢復方法也被利用於預報地表的溫度和濕度。 Wangara實驗第33天,早上9時的資料被用作初始場,積分3小時後,改變溫度和濕度場,以產生雲層。然後,模式再被積分45小時。模擬的平均場和紊流通量場性質和其他高階紊模式結果相當一致。白天,在低層對流邊界層內紊流熱通量隨高度增加而減少。在雲內有一主要的紊流熱通量最大?存在,主要是由於潛熱釋放和輻射冷?加強所致。夜晚,近地大氣的紊流熱通量向下,但是在雲量的最大紊流熱通量,仍然維持?。在雲頂有一向下的紊流熱通存在。
A simple one-dimensional ensemble average PBL model, including condensation, evaporation, and atmospheric radiation is used to study the evolution of PBL in a cloudy atmosphere. The turbulent kinetic energy E is predicted by the TKE equation. The eddy coefficient is proportional to √El; the length scale l is determined by Sun and Ogura's method. Meanwhile, the similarity equations are used in the surface layer; the force restoring method is adopted to calculate the surface soil temperature and moisture. The observed fields at 0900 EST on Day 33 in the Wangara Experiment are used for the first 3 hours(to 1200 EST).After that time, the temperature and moisture are modified in order to initiate a cloud layer and then, the model is integrated for 45 hours. The simulated mean fields and eddy fluxes are comparable with other higher-order model and observations. During the daytime, the linear decreases of (The equation is abbreviated) with height in the lower convective layer are consistent with a uniform change of meant temperature within the subcloud layer. A slightly negative heat flux exists near the cloud base and just above the cloud top. A substantial positive heat flux exists in the cloud layer, primarily attributed to the latent heat release and enhanced by the strong radiative cooling. During the night, the heat flux near the surface becomes negative. Like the daytime results, a positive heat flux exists inside the cloud and a negative heat flux exists just above the cloud top.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 1卷2期 (1990.6)
The Characteristics of Ground Motions Caused by Blasting in the Peikang Area/ Kuo-Liang WenYeong-Tein Yeh
Free-Air Gravity Map of Taiwan and Its Applications/ Horng-Yuan YenYih-Hsiung YehCheng-Horng LinGuey-Kuen YuYi-Ben Tsai
Diurnal Oscillation of the Convective Boundary Layer Part 2: Cloudy Atmosphere/ Ching-Chi WuWen-Yih Sun
The Observations of Meteor Trail Made with Chung-Li VHF Radar/ Yen-Hsyang ChuTson-Ron Chian
An Application of T-X Domain Dip Filter in Extracting Water Bottom Multiples/ Chang-Sheng HuangJiunn-Yih ChenJuin-Wei KuYu-Lang Yang
 
   
 
   

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