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首页> 外文期刊>Radio Science >First simultaneous measurement of vertical air velocity, particle fall velocity, and hydrometeor sphericity in stratiform precipitation: Results from 47 MHz wind-profiling radar and 532 nm polarization lidar observations
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First simultaneous measurement of vertical air velocity, particle fall velocity, and hydrometeor sphericity in stratiform precipitation: Results from 47 MHz wind-profiling radar and 532 nm polarization lidar observations

机译：首次同时测量层状降水中的垂直空气速度，粒子坠落速度和水凝球的球形度：47 MHz的风廓线雷达和532 nm的偏振激光雷达观测结果

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摘要

Results from simultaneous measurements of vertical air velocity (W), particle fall velocity, and hydrometeor sphericity in stratiform precipitation are reported for the first time. Cases of stratiform precipitation on 8 (case A) and 16 December 2008 (case B) observed at Sumatra, Indonesia (0.2°S, 100.32°E), are described. A 47 MHz wind-profiling radar measured Wand reflectivity-weighted particle fall velocity relative to the air (V_Z) simultaneously. Upward W above ~6.0 km altitude in case B (>0.2 m s~(-1)) was greater than in case A (<0.1 m s~(-1)). V_Z at 300 m above the 0℃ altitude in case B (1.8 m s~(-1)) was greater than in case A (1.3 m s~(-1)). The thickness of melting layer (ML) in case B (900 m) was greater than in case A (300 m). Because the large-sized aggregates contribute to produce greater V_Z and thicker ML, it is likely that entangled growth of dendritic crystals under the presence of significant upward W and enhanced aggregation occurrence by the well-developed dendritic crystals produced the large-sized aggregates. Lidar measured an increase of linear depolarization ratio (δ) and lidar dark band in the ML. Volume δ of raindrops was 0.08-0.10 in case B and close to zero in case A. Stronger multiple scattering in case B is likely a cause that produced the greater S. In case δ, a dip of δ was measured at the bottom of ML. The decrease of hydrometeor nonsphericity at the final stage of melting explains the dip.
机译：首次报告了同时测量垂直气流速度（W），颗粒下落速度和层状降水中水流星度的结果。描述了在印度尼西亚苏门答腊（0.2°S，100.32°E）观察到的8月（案例A）和2008年12月16日（案例B）的层状降水案例。一台47 MHz的风廓线雷达同时测量了Wand的反射率加权粒子相对于空气的下降速度（V_Z）。在情况B（> 0.2 m s〜（-1））中，高于〜6.0 km的高度W大于情况A（<0.1 m s〜（-1））。 B组（1.8 m s〜（-1））在0℃高度以上300 m处的V_Z大于A组（1.3 m s〜（-1））。情况B（900 m）的熔化层（ML）的厚度大于情况A（300 m）的熔化层的厚度。因为大型聚集体有助于产生更大的V_Z和更厚的ML，所以在显着向上的W的存在下，树枝状晶体的纠缠生长和由发达的树枝状晶体增强的聚集发生可能产生了大型聚集体。激光雷达测量了ML中线性去极化率（δ）和激光雷达暗带的增加。案例B中雨滴的体积δ为0.08-0.10，案例A中接近零。案例B中更强的多次散射很可能是产生更大S的原因。案例δ中，在ML的底部测得δ的下降。融化最后阶段水凝液非球形性的降低解释了下降。

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  • 来源
    《Radio Science》 |2012年第3期|p.RS3002.1-RS3002.14|共14页
  • 作者

    Tomoaki Mega; Masayuki K. Yamamoto; Makoto Abo; Yasukuni Shibata; Hiroyuki Hashiguchi; Noriyuki Nishi; Toyoshi Shimomai; Yoshiaki Shibagaki; Mamoru Yamamoto; Manabu D. Yamanaka; Shoichiro Fukao; Timbul Manik;

  • 作者单位

    Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;

    Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;

    Faculty of System Design, Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan;

    Faculty of System Design, Tokyo Metropolitan University, 6-6 Asahigaoka, Hino, Tokyo 191-0065, Japan;

    Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;

    Graduate School of Science, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan;

    Interdisciplinary Faculty of Science and Engineering, Shimane University, 1060 Nishikawatsu-cho, Matsue, 690-8504, Japan;

    Faculty of Information and Communication Engineering, Osaka Electro-Communication University, Neyagawa Campus, 18-8 Hatsu- cho, Neyagawa, Osaka 572-8530, Japan;

    Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;

    Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan SATREPS-MCCOE Promotion Office, NEONET, BPP Teknologi, Jakarta, Indonesia Graduate School of Science, Kobe University, Kobe, Japan Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan;

    Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan;

    National Institute of Aeronautics and Space (LAPAN), Jalan Dr. Djundjunan 133, Bandung 40173, Indonesia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
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  • 正文语种 eng
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  • 入库时间 2022-08-18 01:31:08

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