Mixing Processes and their Influence on Drop Size Distribution in Florida Cumuli

佛罗里达积云的混合过程及其对液滴尺寸分布的影响

• 批准号: 9707301
• 负责人: Gerald North
• 金额: $ 12.16万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-08-01 至 2001-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9707301&HistoricalAwards=false
• 关键词: Mixing; Processes; their; Influence; Drop

Zipser/Abstract ATM-9707301 In this project we will examine factores responsible for broadening the size distributions of cloud droplets in small cumulus clouds, with special attention to the roles of mixing and entrainment in that process. The main budget item is support for a graduate student, Richard Igau, who will work under the guidance of Drs. Ed Zipser of Texas A&M University and W. A. Cooper of the National Center or Atmospheric Research. The primary data source will be the Small Cumulus Microphysics Study (SCMS), a field program in Florida that used the NCAR CP2 dual-wavelength radar and three instrumented research aircraft. Many small cumulus clouds developed witin 10-20 km of this rdar during the project, and a good sample of these were studied by the three instrumented research aircraft. Conventional Forward Scattering Spectrometer Probes (FSSPs) and King liquid water probes were present on all aircraft, and in addition the Fast FSSP (FFSSP) of Brenguier et al. (1996), the Cloud Droplet Spectrometer (CDS) of Lawson and Cormack (1995), the Droplet Spaceing Monitor (DSM) of Baumgardner et al. (1993), and the PVM-100 liquid water content probe of Gerber et al. (1994) were all used in the SCMS. These new instruments provide much improved resolution in droplet size and in space, and so should help overcome the limitations of the standard FSSP which have compromised many past studies, and so should help overcome the limitatins of the standard FSSP which have compromised many past studies of droplet size distributions. In the course of this resesarch, we will assess ofthe characteristics and value of the new instruments for measuring droplet size distributions, will characterize typical droplet size distribuions in unmixed and mixed regions of cloud, and will compare the widths of these size distributions to theoretical predicitions. We will also study the entrainment and mixing process, as a topic in itself as well as for its influence on droplet size distributions. The new instruments should provide better characterization of droplet sizes than has been available to similiar studies in the past, and the goood simultaneous observations by a very sensitive radar should support better interpretation of the microphysical observations in terms of the life history and dynamics of the clouds. It should therefore be possible to test theoretical predictions critically, and so to develop an improveed understanding of how droplet size distributions develop in cumulus clouds.

Zipser/Abstract ATM-9707301 在这个项目中，我们将研究负责扩​​大小积云中云滴尺寸分布的因素，特别关注混合和夹带在该过程中的作用。 主要预算项目是为研究生理查德·伊高（Richard Igau）提供支持，他将在博士的指导下工作。德克萨斯 A&M 大学的 Ed Zipser 和国家大气研究中心的 W. A. Cooper。 主要数据来源将是小积云微物理研究 (SCMS)，这是佛罗里达州的一个现场项目，使用 NCAR CP2 双波长雷达和三架仪表研究飞机。 项目期间，在该雷达的 10-20 公里范围内形成了许多小型积云，三架仪表研究飞机对其中的良好样本进行了研究。 所有飞机上均配备了传统前向散射光谱仪探头 (FSSP) 和 King 液态水探头，此外还有 Brenguier 等人的快速 FSSP (FFSSP)。 (1996)、Lawson 和 Cormack (1995) 的云滴光谱仪 (CDS)、Baumgardner 等人的液滴间距监测器 (DSM)。 (1993)，以及 Gerber 等人的 PVM-100 液态水含量探头。 (1994) 全部用于 SCMS。 这些新仪器在液滴尺寸和空间方面提供了大大提高的分辨率，因此应该有助于克服标准 FSSP 的局限性，这些局限性损害了过去许多研究的局限性，因此应该有助于克服标准 FSSP 的局限性，这些局限性损害了过去许多液滴尺寸分布的研究。 在本研究过程中，我们将评估用于测量液滴尺寸分布的新仪器的特性和价值，将表征云中非混合和混合区域中的典型液滴尺寸分布，并将这些尺寸分布的宽度与理论预测进行比较。 我们还将研究夹带和混合过程，作为一个主题本身及其对液滴尺寸分布的影响。 与过去的类似研究相比，新仪器应该能够更好地表征液滴尺寸，并且非常灵敏的雷达的良好同步观测应该支持更好地解释云的生命史和动力学方面的微物理观测结果。 因此，应该可以批判性地测试理论预测，从而更好地了解积云中液滴尺寸分布的发展情况。