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Nabro aerosol evolution observed jointly by lidars at a mid-latitude site and CALIPSO

机译：在中纬度地点的激光雷达和CALIPSO共同观测到Nabro气溶胶的演变

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摘要

Evolution of the Nabro volcanic aerosols from initially-localized plumes to a decaying hemisphericallycovered layer was jointly observed by ground-based lidars at Wuhan (30.5 degrees N, 114.4 degrees E), China and CAL-IPSO. During the aerosol plume formation period, from the Nabro eruption to early July 2011, the lidar backscatter ratio related to the Nabro aerosols above Wuhan varied strongly both in vertical structure and intensity, suggesting that the Nabro aerosol distribution was horizontally inhornogeneous. The stratospheric aerosol optical depth (AOD) from CALIPSO shows that the Nabro plume first circled around the Asian monsoon anticyclone and then gradually fulfilled the whole anticyclone area with a net aerosol enhancement, which may reflect a gas-particle conversion (from sulfur dioxide gas) and/or particle injection from the upper troposphere. During the horizontal dispersion period, from early July to mid August 2011, the stratospheric AOD over Wuhan declined rapidly since the Nabro particles were transported throughout the northern hemisphere. A nearly horizontally-uniform volcanic aerosol layer was formed. During the local cleansing period, from mid-August to the end of 2011, the Nabro aerosol layer over Wuhan had a single-peak structure and decayed uniformly. The corresponding e-folding decay time for the layer AOD is similar to 130 days. The lidar measurements at Wuhan gave a small depolarization ratio and large backscatter-related Angstrom exponent for the Nabro aerosols on 8 July, suggesting that the majority of these aerosols were spherical and small. The effective radius and total mass for the Nabro aerosol particles were estimated to be similar to 0.26 gm and similar to 0.32 Tg respectively. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在武汉（北纬30.5度，东经114.4度），中国和CAL-IPSO上，地面激光雷达共同观测到Nabro火山气溶胶从最初的羽状流向半球形覆盖层的演化。在气溶胶羽流形成期间，从纳布罗喷发到2011年7月上旬，与武汉上空的纳布罗气溶胶有关的激光雷达后向散射比在垂直结构和强度上都有很大变化，这表明纳布罗气溶胶的分布在水平方向上是非均质的。来自CALIPSO的平流层气溶胶光学深度（AOD）表明，Nabro羽首先绕亚洲季风反旋风盘旋，然后逐渐以净气溶胶增强的形式满足了整个反旋风区的需求，这可能反映了气体颗粒转化（来自二氧化硫气体）和/或从对流层高层注入粒子。在水平分散期间，2011年7月上旬至8月中旬，由于纳布罗颗粒物在北半球的运输，武汉上空的平流层AOD迅速下降。形成了几乎水平均匀的火山气溶胶层。在局部清洁期间，从8月中旬到2011年年底，武汉上空的纳布罗气溶胶层为单峰结构，并均匀衰减。 AOD层的相应电子折叠衰减时间类似于130天。武汉7月8日的激光雷达测量结果显示，Nabro气溶胶的去极化率小，背散射相关的Angstrom指数大，这表明这些气溶胶大多数为球形且很小。 Nabro气雾剂颗粒的有效半径和总质量分别估计约为0.26 gm和0.32 Tg。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Atmospheric environment》 |2016年第9期|106-116|共11页
  • 作者

    Zhuang J.; Yi F.;

  • 作者单位

    Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R China|Minist Educ, Key Lab Geospace Environm & Geodesy, Wuhan 430072, Peoples R China;

    Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R China|Minist Educ, Key Lab Geospace Environm & Geodesy, Wuhan 430072, Peoples R China|State Observ Atmospher Remote Sensing, Wuhan 430072, Peoples R China;

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  • 关键词

    Volcanic aerosols; Lidar; CALIFS; Evolution; Backscatter ratio; Mass concentration;

    机译：火山气溶胶;激光雷达;CALIFS;演化;后向散射比;质量浓度;

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