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首页> 外文期刊>Journal of Applied Meteorology and Climatology >Use of Radar Chaff for Studying Circulations in and around Shallow Cumulus Clouds
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Use of Radar Chaff for Studying Circulations in and around Shallow Cumulus Clouds

机译：使用雷达箔条研究浅积云及其周围的环流

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Circulations in and around cumulus clouds are inferred by using a passive tracer (radar chaff) and an airborne cloud radar during the Barbados Aerosol Cloud Experiment (BACEX). The radar chaff elements used for this experiment are fibers that are cut to a length of about 1/2 of the radar wavelength to maximize radar returns by serving as dipole antennas. The fibers are packed in fiber tubes and are mounted in a dispenser beneath the wing of the aircraft. The chaff was released near the tops and edges of a growing small cumulus cloud. The aircraft then made penetrations of the cloud at lower levels to observe the chaff signals above the aircraft with the zenith-pointing cloud radar. This study shows that the environmental air above the cloud top descends along the downshear side of the cloud edge and is subsequently entrained back into the same cloud near the observation level. The in-cloud flow follows an inverted letter P pattern. The merits and limitations of the chaff method for tracking circulations in and around small cumuli are discussed
机译：在巴巴多斯气溶胶云实验（BACEX）期间，通过使用被动示踪剂（雷达谷壳）和机载云雷达来推断积云内部和周围的环流。用于本实验的雷达糠壳元素是纤维，被切成雷达波长的大约1/2的长度，以用作偶极天线来最大化雷达回波。纤维被包装在纤维管中，并被安装在飞机机翼下方的分配器中。谷壳在附近逐渐生长的小积云的顶部和边缘释放。然后，飞机在较低高度穿透云层，并通过天顶指向云雷达观察飞机上方的谷壳信号。这项研究表明，云顶上方的环境空气沿云边缘的下剪切面下降，随后被带回到观测层附近的同一云层。云内流遵循反向字母P模式。讨论了用谷壳法跟踪小积云中及其周围环流的优缺点

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