In situ measurements of effective diameter and effective droplet number concentration

In situ measurements of effective diameter and effective droplet number concentration
复制标题

有效直径和有效液滴数浓度的原位测量

DOI：
--
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
A. N. Nevzorov
A. N. Nevzorov
中科院分区：
--
文献类型：
--
作者：
A. Korolev;G. Isaac;J. Strapp;A. N. Nevzorov

文献摘要

被引文献

相似文献

云滴的有效直径通常由粒子测量系统（PMS）探测器测量的云滴尺寸分布得出。这种方法的缺点是PMS探针具有截断的尺寸范围。在RACE项目期间，测量有效直径的另一种方法是使用安装在国家研究理事会（NRC）双水獭上的云消光计和King和Nevzorov热线液态水含量和总含水量（LWC/TWC）探头。有效直径由消光系数（e）和液态水含量（W）的直接原位测量得出，Deff= k1 W/e。这种计算Deff的方法没有与从截断的粒度分布导出Deff有关的问题。由于e和W的测量覆盖了云粒子的整个尺寸范围，因此该方法给出了准确的Deff值。这种方法也可以成功地应用于混合和冰相云，因为Nevzorov TWC探测器提供了总（冰加液体）水含量的测量。有效数浓度计算为Neff = k2 × 3/W2。比较Deff和Neff，通过这种方法计算，并直接从PMS前向散射光谱仪探头（FSSP）的光谱，是有利的条件的子集时，FSSP被认为是完全和准确地测量光谱。
The effective diameter of cloud droplets is usually derived from measurements of droplet size distribution measured by Particle Measuring Systems (PMS) probes. The disadvantage of this method is that PMS probes have a truncated size range. During the RACE project, an alternative method to measure the effective diameter used a cloud extinction meter and King and Nevzorov hot wire liquid water content and total water content (LWC/TWC) probes installed on the National Research Council (NRC) Twin Otter. The effective diameter was derived from direct in situ measurements of the extinction coefficient (e) and liquid water content (W) as Deff=k1W/e. This method of calculation of Deff is free of problems related to deriving Deff from the truncated particle size distribution. Since measurements of e and W cover the whole size range of cloud particles, this method gives an accurate value of Deff. This method can also be successfully applied for mixed and ice phase clouds, since the Nevzorov TWC probe provides measurements of total (ice plus liquid) water content. Effective number concentration was calculated as Neff = k2ϵ3/W2. Comparisons of Deff and Neff, calculated by this method, and directly from PMS Forward Scattering Spectrometer Probe (FSSP) spectra, are favorable in the subset of conditions when the FSSP is considered to measure the spectra fully and accurately.