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首页> 外文会议>Lidar technologies, techniques, and measurements for atmospheric remote sensing XIII >Lidar and in situ observations of aerosols, radiation fluxes, and meteorological parameters during the 20 March 2015 Solar eclipse over southern Italy
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Lidar and in situ observations of aerosols, radiation fluxes, and meteorological parameters during the 20 March 2015 Solar eclipse over southern Italy

机译：2015年3月20日意大利南部日食期间的激光雷达和实地观测的气溶胶，辐射通量和气象参数

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The effects of the 20 March 2015 partial solar eclipse on irradiance measurements, Planetary Boundary Layer (PBL) height, meteorological and turbulence parameters, and near surface particle properties have been investigated at Lecce (40.3°N, 18.1°E, 30 m a.s.l.), southeastern Italy. Each solar eclipse represents always a unique event, since it is characterized by a particular time of the day, season, location, and synoptic conditions, and allows investigating the atmospheric processes driven by a fast decrease of the solar radiation. According to the astronomic data, the eclipse started at the study site at about 08:30 UTC and ended at 10:47 UTC, reaching the maximum obscuration of the solar disk (43.6%) at about 09:37 UTC. Short-wave irradiance measurements revealed that the eclipse direct radiative forcing at the surface was equal to -307 W m_2 at the maximum obscuration of the solar disk. A lidar system operating at the study site within the European Aerosol Lidar NETwork (EARLINET) was used to investigate both the atmospheric turbulence weakening driven by the eclipse cooling effect and the PBL height time evolution. It has been found that the PBL height that was equal to 300 ± 30 m before the eclipse onset decreased up to 210 ± 20 m after the eclipse full phase. Measurements from a micrometeorological station have instead been used to investigate the atmospheric turbulence weakening at the ground level by the changes of turbulent kinetic energy. Integrating nephelometer measurements revealed that the solar eclipse was also responsible for the increase of the near surface particle scattering coefficient, mainly because of the increase of the fine-mode particle concentration.
机译：在莱切（40.3°N，18.1°E，30 m asl）下，研究了2015年3月20日部分日食对辐照度测量，行星边界层（PBL）高度，气象和湍流参数以及近地表粒子特性的影响。 ，意大利东南部。每个日食总是代表一个独特的事件，因为它的特点是一天中的特定时间，季节，位置和天气状况，并允许调查由太阳辐射的快速下降所驱动的大气过程。根据天文学数据，日食从研究地点的UTC大约在08:30开始，到10:47 UTC结束，在大约09:37 UTC达到太阳盘的最大遮盖度（43.6％）。短波辐照度测量表明，在太阳盘的最大遮挡下，日食在表面的直接辐射强迫等于-307 W m_2。在欧洲气溶胶激光雷达网络（EARLINET）内的研究现场运行的激光雷达系统用于研究由日食冷却效应驱动的大气湍流减弱和PBL高度时间演变。已经发现，在日食开始之前等于300±30 m的PBL高度下降到日食全相之后的210±20 m。取而代之的是，使用微气象站的测量方法来研究由于湍动能的变化而使地面上的大气湍流减弱。积分浊度仪的测量结果表明，日食也是造成近表面颗粒散射系数增加的主要原因，主要是由于精细模式颗粒浓度的增加。

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