Measurements of raindrop breakup by using UHF wind profilers
Measurements of raindrop breakup by using UHF wind profilers
复制标题
使用 UHF 风廓线仪测量雨滴破碎
DOI：
10.1029/2001gl013254
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发表时间：
2001
影响因子：
5.2
通讯作者：
A. Adachi
中科院分区：
文献类型：
--
作者：
Takahisa Kobayashi;A. Adachi
使用超高频风廓线仪测量了日本筑波的对流雨中雨滴尺寸光谱的非常有趣的垂直剖面，该风廓线仪经过日本筑波的剖面仪。它可以测量雨滴的下落速度和环境空气运动，包括平均速度和湍流，从而能够从多普勒频谱得出准确的雨滴尺寸分布。测量的多普勒频谱有显着的高度变化。进一步发现，在3.25公里的高度上出现了大量直径大于6毫米的巨型雨滴。然而，这些巨大的雨滴在海拔2.75公里以下几乎消失，而直径小于1.5毫米的较小雨滴的数量却有所增加。这些变化被解释为是由于分手造成的。
A UHF wind profiler was used to measure a very interesting vertical profile of the raindrop size spectra in a convective rain which went over the profiler at Tsukuba, Japan. It can measure both the fall velocity of raindrops and the ambient air‐motion including the mean velocity and the turbulence, which enables to derive an accurate drop size distribution from the Doppler spectra. The measured Doppler spectra had significant altitude variations. It further was found that a considerable high number of giant raindrops larger than 6 mm in diameter appeared at an altitude of 3.25 km. These giant raindrops, however, almost disappeared at altitudes below 2.75 km, while an increase in the number of smaller raindrops of less than 1.5 mm in diameter was observed. These variations are interpreted to be due to breakup.