A New Version of Hydrometeor Videosonde for Cirrus Cloud Observations
A New Version of Hydrometeor Videosonde for Cirrus Cloud Observations
复制标题
用于卷云观测的新版本水凝物视频探空仪
DOI：
--
复制
发表时间：
1997
期刊：
影响因子：
--
通讯作者：
M. Murakami
中科院分区：
文献类型：
--
作者：
N. Orikasa;M. Murakami
研制了一种新型的水凝物视频探空仪（HYVIS），用于测量低冰晶浓度卷云中水凝物的垂直分布。该探测器有两个小型摄像机，可以拍摄7 μm至5 mm大小的颗粒，并通过1.6 GHz微波将颗粒图像传输到地面站。原始的HYVIS没有足够的采样体积来评估低数量浓度云中水凝物的粒度分布。为了增加取样量，增加了一个小型吸风机。通过室内实验，估算了采样体积随环境气压和探头上升速度的变化。理论计算表明，对于大于10 μm的冰晶，新型HYVIS的收集效率应该是一致的。一些卷云观测的例子表明，新的HYVIS使我们能够确定在250米的间隔大于10 μm的冰晶的可靠的尺寸分布。新的HYVIS测量结果为我们提供了关于卷云形成和维持机制的有用信息。
A new version of hydrometeor videosonde (HYVIS) has been developed to measure the vertical distribution of hydrometeors in cirrus clouds with low ice crystal concentrations. This sonde has two small video cameras that take pictures of particles from 7 μm to 5 mm in size, and transmits particle images by 1.6 GHz microwave to a ground station. The original HYVIS did not have enough sampling volume to evaluate the size distribution of hydrometeors in clouds with low number concentrations. To increase sampling volume, a small suction fan was added. From laboratory experiments, we have estimated the variation in sampling volume with changes of ambient air pressure and ascent velocity of the sonde. Theoretical calculation showed that the collection efficiency of the new HYVIS should be unity for all ice crystals larger than 10 μm. Some examples of cirrus cloud observations have demonstrated that the new HYVIS enabled us to determine reliable size distributions of ice crystals larger than 10 μm at 250 m intervals. The results of the new HYVIS measurements provide us with useful information about mechanisms for the formation and maintenance of cirrus clouds.