Measurements of melting layer attenuation at X‐band frequencies
Measurements of melting layer attenuation at X‐band frequencies
复制标题
X 波段频率下熔化层衰减的测量
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
F. Fabry
中科院分区：
文献类型：
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作者：
A. Bellon;I. Zawadzki;F. Fabry
通过比较X波段和UHF垂直指向雷达的长期平均反射率剖面，推导出层状降水融化层引起的X波段衰减。由亮带引起的总衰减相当于其下方约10 km降雨范围内的衰减。这一亮带衰减仍是“雨当量”衰减的3-5倍，后者是通过对从整个亮带反射率剖面推导出的特定衰减进行积分而获得的，就好像反射率是由雨引起的一样。这表明，在大多数层状降雨的情况下，由于融化层的总衰减超过了它下面的雨。
The attenuation at X band caused by the melting layer of stratiform precipitation is derived by comparing long‐term average reflectivity profiles from collocated X‐band and UHF vertically pointing radars. The total attenuation caused by the bright band is equivalent to the attenuation across approximately 10 km of rain that is present below it. This bright band attenuation is still 3–5 times the “rain equivalent” attenuation, the latter being obtained by integrating the specific attenuation deduced from the entire reflectivity profile across the bright band as if the reflectivity were due to rain. This suggests that in most stratiform rain cases, the total attenuation due to the melting layer exceeds that of the rain below it.