Interaction between a cumulus boundary layer and atmospheric environments

积云边界层与大气环境之间的相互作用

• 批准号: 20540421
• 负责人: SHINODA Taro
• 金额: $ 2.08万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2010
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20540421/
• 关键词: 大気現象; 水循環; 気象学; 大気境界層; 浅い積雲; Large Eddy Simulation (LES); Large Eddy Simulation(LES)

This study investigates the development of a cumulus boundary layer over land using idealized high-resolution numerical simulations with a focus on the onset of "active cumulus" and the effects of the following external factors : the initial amount of water vapor, static stability, and surface energy partition. In the control experiment, the cumulus boundary layer transitions from a condition in which only forced cumulus exists (forced cumulus boundary layer) to a condition in which active cumulus also exists (active cumulus boundary layer). The active cumulus onset almost coincides with an abrupt drop in the level of free convection (LFC). The drop in the LFC is attributed to a decrease in the local minimum value of saturated equivalent potential temperature at the bottom of the inversion layer in addition to an increase in equivalent potential temperature near the land surface.Systematic sensitivity experiments show that the onset time becomes earlier with greater values of initial water vapor, smaller static stability, and greater evaporative efficiency. Because the active cumulus boundary layer keeps growing, the earlier active cumulus onset leads to higher inversion height and subsequently a deeper moist layer.

本研究利用理想化的高分辨率数值模拟研究陆地上空积云边界层的发展，重点是“活动积云”的发生和以下外部因素的影响：初始水汽量、静稳定度和表面能量分配。在控制实验中，积云边界层从仅存在强制积云的条件（强制积云边界层）转变为也存在活动积云的条件（活动积云边界层）。活跃积云的出现几乎与自由对流（LFC）水平的突然下降相一致。LFC的下降是由于在逆温层底部的饱和等效位温的局部最小值的减少，除了在陆面附近的等效位温的增加.系统的敏感性实验表明，LFC的开始时间变得更早的初始水汽值，较小的静态稳定度，和更大的蒸发效率。由于活动积云边界层不断增长，活动积云出现越早，逆温高度越高，湿层越厚。

项目成果

Structure of Convective Circulation in the Atmospheric Boundary Layer over the Northwestern Pacific Ocean under a Subtropical High

副热带高压作用下西北太平洋大气边界层对流环流结构

• DOI: 10.2151/jmsj.87.979
• 发表时间: 2009
• 期刊: Journal of the Meteorological Society of Japan
• 影响因子: 3.1
• 作者: T. Shinoda;A. Higuchi;K. Tsuboki;T. Hiyama;Hiroki Tanaka;S. Endo;H. Minda;H. Uyeda;K. Nakamura
• 通讯作者: K. Nakamura

中国華中域における大気境界層・降水システム研究の進展～GAME/HUBEX IOPからの10年～

华中地区大气边界层与降水系统研究进展~GAME/HUBEX IOP10年~

• 发表时间: 2008
• 作者: 篠田太郎;山田広幸;遠藤智史;上田博;篠田太郎・山田広幸・遠藤智史・上田博
• 通讯作者: 篠田太郎・山田広幸・遠藤智史・上田博

湿潤な陸域における対流境界層と積雲の数値実験

湿地地区对流边界层和积云的数值试验

• 发表时间: 2008
• 作者: 遠藤智史;篠田太郎;坪木和久;上田博
• 通讯作者: 上田博

Development of cumulus boundary layer over land.

陆地上积云边界层的发展。

• 发表时间: 2009
• 作者: 遠藤智史;篠田太郎;坪木和久;上田博
• 通讯作者: 上田博

Characteristics of Vertical Circulation in the Convective Boundary Layer over the Huaihe River Basin in China in the Early Summer of 2004

• DOI: 10.1175/2008jamc1769.1
• 发表时间: 2008-11
• 期刊: Journal of Applied Meteorology and Climatology
• 影响因子: 3
• 作者: S. Endo;T. Shinoda;Hiroki Tanaka;T. Hiyama;K. Tsuboki;H. Uyeda;K. Nakamura