Early Radar Echoes from Ultragiant Aerosol in a Cumulus Congestus: Modeling and Observations
Early Radar Echoes from Ultragiant Aerosol in a Cumulus Congestus: Modeling and Observations
复制标题
浓积云中超巨气溶胶的早期雷达回波：建模和观测
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
J. Straka
中科院分区：
文献类型：
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作者：
S. Lasher;C. Knight;J. Straka
摘要本文分析了超巨气溶胶（UGA）在模拟三维云的拉格朗日框架中的增长，并与小积云微物理研究（SCMS）期间收集的积云的雷达和飞机观测结果进行了比较。UGA被摄入到模拟云和增长的连续收集，由此产生的雷达反射率因子和雨滴浓度进行评估，在1分钟的时间间隔。计算结果在短时间（18分钟）内产生了大量的回波（>30 dBZ），包含少量雨滴（0.3 L−1）。计算的雷达回波是非常敏感的UGA摄入到模拟云和其液态水含量的量。模拟的雷达回波和雨滴浓度与观测结果一致，差异在模拟和测量的局限性和不确定性范围内。
Abstract The growth of ultragiant aerosol (UGA) in a Lagrangian framework within a simulated three-dimensional cloud is analyzed and compared with radar and aircraft observations of a cumulus congestus collected during the Small Cumulus Microphysics Study (SCMS). UGA are ingested into the simulated cloud and grow by continuous collection; the resulting radar reflectivity factor and raindrop concentrations are evaluated at 1-min intervals. The calculations produce a substantial echo (>30 dBZ) within a short time (18 min), containing few raindrops (0.3 L−1). The calculated radar echo is very sensitive to the amount of UGA ingested into the modeled cloud and its liquid water content. The modeled radar echo and raindrop concentrations are consistent with the observations in that the differences fall within the modeling and measurement limitations and uncertainties.