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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Lidar measurements during Aerosols99
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Lidar measurements during Aerosols99

机译：气溶胶期间的激光雷达测量99

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The Aerosols99 cruise (January 14 to February 8, 1999) went between Norfolk, Virginia, and Cape Town, South Africa. A Micropulse lidar system was used almost continually during this cruise to profile the aerosol vertical structure. Inversions of this data illustrated a varying vertical structure depending on the dominant air mass. In clean maritime aerosols in the Northern and Southern Hemispheres the aerosols were capped at 1 km. When a dust event from Africa was encountered, the aerosol extinction increased its maximum height to above 2 km. During a period in which the air mass was dominated by biomass burning from southern Africa, the aerosol layer extended to 4 km. Comparisons of the aerosol optical depth (AOD) derived from lidar inversion and surface Sun photometers showed an agreement within +/-0.05 RMS. Similar comparisons between the extinction measured with a nephelometer and particle soot absorption photometer (at 19 m altitude) and the lowest lidar measurement (75 m) showed good agreement (+/-0.014 km(-1)). The lidar underestimated surface extinction during periods when an elevated aerosol layer (total AOD > 0.10) was present over a relatively clean (aerosol extinction < 0.05 km(-1)) surface layer, but otherwise gave accurate results. [References: 22]
机译：Aerosols99巡游（1999年1月14日至2月8日）在弗吉尼亚州的诺福克和南非的开普敦之间进行。在此巡航期间，几乎连续使用了微脉冲激光雷达系统，以描绘气溶胶的垂直结构。该数据的反演说明了取决于主要空气质量的变化的垂直结构。在北半球和南半球的清洁海洋气溶胶中，气溶胶的上限为1公里。当遇到来自非洲的粉尘事件时，气溶胶的绝灭使其最大高度增加到2 km以上。在空气质量以南部非洲燃烧的生物质为主导的时期，气溶胶层延伸至4 km。由激光雷达倒置和表面太阳光度计得出的气溶胶光学深度（AOD）的比较显示，在+/- 0.05 RMS内一致。用浊度计和颗粒烟灰吸收光度计（在19 m高度）测量的消光与最低激光雷达测量值（75 m）之间的相似比较显示出良好的一致性（+/- 0.014 km（-1））。当在相对干净的表面（气溶胶消光<0.05 km（-1））上存在升高的气溶胶层（总AOD> 0.10）时，激光雷达低估了表面的消光，但否则得出了准确的结果。 [参考：22]

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