Entrainment and Microphysics of Stratocumulus Clouds

层积云的夹带和微物理

• 批准号: 0107738
• 负责人: Hermann Gerber
• 金额: $ 12.8万
• 依托单位: Gerber Scientific Inc.
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0107738&HistoricalAwards=false
• 关键词: Entrainment; Microphysics; Stratocumulus; Clouds

The objective of this project is to study mixing processes and cloud droplet growth as part of DYCOMS-II (Dynamics and Chemistry of Marine Stratocumulus), a collaborative field program conducted off the coast of California in July 2001. The experimental program, based on the NSF C-130 research aircraft, will provide data of unprecedented high resolution on air motions, temperature, and humidity. The Particle Volume Monitor (PVM) of Dr. Gerber will also be deployed, to give information on the fine-scale variability of cloud water content. Four studies related to entrainment and mixing at cloud top will be undertaken:1. Estimation of entrainment rate using high-resolution measurements of liquid water content, humidity, and vertical air velocity.2. Investigation of the cause of an apparent "scale break" at a scale of several meters in the spectrum of liquid water content fluctuations.3. Formulation of a conceptual model of the structure of the cloud-top layer.4. Exploring the possibility of enhanced condensation near cloud top caused by the mixing of air parcels with different temperatures.The ultimate goal of the research is to improve the ability to model the development of marine stratocumulus clouds, taking into account mixing processes at cloud top. This will lead to better parameterization of cloud processes in climate models.

该项目的目的是研究混合过程和云滴增长，作为DYCOMS-II（海洋层积云动力学和化学）的一部分，DYCOMS-II是2001年7月在加州海岸外进行的一个合作实地计划。 该实验计划以NSF C-130研究飞机为基础，将提供有关空气运动、温度和湿度的前所未有的高分辨率数据。 还将部署Gerber博士的粒子体积监测器（PVM），以提供有关云水含量精细尺度变化的信息。 将进行四项与云顶卷吸和混合有关的研究：1。利用液态水含量、湿度和垂直空气速度的高分辨率测量来估计夹带率。研究了液态水含量波动谱中几米尺度上出现明显“尺度突变”的原因.云顶层结构的概念模式的制定.探讨不同温度的气团混合在云顶附近引起凝结增强的可能性。研究的最终目标是提高模拟海洋层积云发展的能力，同时考虑云顶的混合过程。 这将导致气候模式中云过程的更好参数化。