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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/4543
標題: | 重力波動對層積雲系統垂直結構及雲量之影響 Impact of Gravity Waves on Marine Stratocumulus Variability: Vertical Structures and Cloud Coverage |
作者: | Yu-Yu Lin 林佑宇 |
指導教授: | 郭鴻基(Hung-Chi Kuo) |
共同指導教授: | 吳健銘(Chien-Ming Wu) |
關鍵字: | 邊界層,層積雲,邊界層分離,中尺度重力波動,表面通量, stratocumulus,upsidence wave,decoupling,entrainment,surface flux,stratocumulus-topped boundary layer,STBL, |
出版年 : | 2015 |
學位: | 碩士 |
摘要: | This study aims to understand the impacts of gravity waves on the cloud fraction and vertical structures of stratocumulus topped boundary layer (STBL) under two strat-ocumulus regimes. The impact of such gravity waves on STBL is investigated using a high-resolution vector vorticity equation based cloud resolving model (VVM) (Jung and Arakawa 2008; Wu and Arakawa 2011) by adding large-scale convergence that mimics observed mesoscale semidiurnal waves.
The results show that the wave induced vertical velocity causes STBL to become decoupled. During the ascending phase, the cloud is lifted and thickens. With larger cloud amount, Entrainment-Liquid Flux feedback (ELF) starts to adjust by enhancing cloud top entrainment and cloud base warming, which causes STBL to become decou-pled. Furthermore, the results show that the vertical structure and cloud fraction at the end of simulation is largely determined by the sea surface fluxes. The experiment with weaker surface fluxes causes STBL to break up by limiting Surface-based Mixed Layer (SML) cumuliform clouds. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/4543 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 大氣科學系 |
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