****************************************************************************************************************

第349回 大気海洋物理学・気候力学セミナー のおしらせ

日　時：7月 15日 (木) 10:30 - 12:00
Date ：Thu., 15 July 10:30 - 12:00
ツール：Zoom (Online)
Tool ：Zoom (Online)

注意事項 ：Zoomのミーティング情報が必要な場合は下記のメールアドレスまでお問い合わせください。
Note ：If you need Zoom meeting information, please contact us at the email address below.

発表者：高橋葉仁衣 (米国カリフォルニア大学ロサンジェルス校/ NASA ジェット推進研究所)
Speaker：Hanii Takahashi (UCLA/JPL NASA)
題目：CloudSat衛星搭載雲レーダーを軸とする衛星データ解析に基いた対流雲の特性とその海陸差
Title :The land-ocean differences in convective cloud characteristics: new perspectives based on CloudSat/A-Train observations

****************************************************************************************************************

CloudSat衛星搭載雲レーダーを軸とする衛星データ解析に基いた対流雲の特性とその海陸差
The land-ocean differences in convective cloud characteristics: new perspectives based on CloudSat/A-Train observations
高橋葉仁衣（Hanii Takahashi）
発表要旨：

Convection is a key component of Earth’s climate system, 
causing　complex couplings among radiative, thermodynamic, and dynamic processes 
of　the system. Properly modeling and representing convection has long been 
a　central task of weather and climate models. Among various processes
associated with convection, entrainment of the ambient air plays a 
critical　role as it dilutes the strength of vertical transport by convection. For
over half a century, an inverse relationship between entrainment rate ()
and convective core size (R) has been used in modeling convective clouds.
The purpose of this study is to revisit the relation using multiple 
years　of CloudSat observations. Our results show that the inverse relationship 
is　robust. Now, through the series of publications by the presenter, a
coherent picture emerges revealing a distinct land-ocean contrast in
convective cloud characteristics: continental convective clouds tend to
have wider, stronger, and less diluted convective cores, as well as 
higher　convective detrainment levels, enabling more efficient convective 
vertical　transport of cloud material to higher levels compared to oceanic 
convective　clouds. These results have important implications for understanding how 
the　characteristics of convective clouds and the mechanisms of convective
processes over land and ocean are fundamentally different from each 
other　in nature. Studying these differences in convective cloud 
characteristics　and investigating the fundamental processes behind them with convective
evolution in mind will not only help us better understand atmospheric 
moist　convection as a science subject, but also lead to development of methods
and metrics for evaluating cloud-scale and global models in simulation 
of　convection.

Biography:
Hanii Takahashi is an assistant researcher with UCLA, located at JPL and
affiliated with the Aerosol and Cloud Science group. She obtained a
Doctoral Degree in Earth and Environmental Science at CUNY, in 2013. Her
primary research interest is convective dynamics in tropical deep
convective clouds and warm rain formation processes in low liquid clouds.
She is also interested in the study of evolution in clouds and
precipitation.
    

----------
連絡先