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

拉链/摘要 ATM-9707301 在这个项目中，我们将研究的因素负责扩大小积云云滴的大小分布，特别注意在该过程中的混合和夹带的作用。 主要的预算项目是对研究生理查德·伊高的支持，他将在德克萨斯农工大学的艾德·齐普瑟博士和W。A.国家大气研究中心的库珀说。 主要数据源将是小积云微物理研究（SCMS），这是佛罗里达的一个实地项目，使用了NCAR CP 2双波长雷达和三架装有仪器的研究飞机。 在项目期间，许多小的积云在该雷达10-20公里的范围内发展起来，三架装有仪器的研究飞机研究了其中的一个很好的样本。 所有飞机上都有传统的前向散射光谱仪探头（FSSP）和King液态水探头，此外还有Brenguier等人（1996）的快速前向散射光谱仪（FFSSP）、Lawson和Cormack（1995）的云滴光谱仪（CDS）、Baumgarbane等人（1993）的液滴空间监测仪（DSM），和Gerber等（1994）的PVM-100液态水含量探头。 这些新仪器在液滴尺寸和空间分辨率方面提供了很大的改进，因此应该有助于克服标准FSSP的局限性，这些局限性损害了许多过去的研究，因此应该有助于克服标准FSSP的局限性，这些局限性损害了许多过去的液滴尺寸分布研究。 在这项研究过程中，我们将评估新仪器的特点和价值，用于测量水滴大小分布，将表征典型的水滴大小分布在云的未混合和混合区域，并将比较这些大小分布的宽度理论预测。 我们还将研究卷吸和混合过程，作为一个主题本身，以及其对液滴尺寸分布的影响。 新的仪器应提供更好的表征液滴的大小比已提供给过去的类似研究，和良好的同步观测的一个非常敏感的雷达应支持更好的解释的微物理观测的生命史和动力学的云。 因此，有可能对理论预测进行严格的检验，从而加深对积云中水滴尺寸分布的理解。

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.