Abstract. Aerosol vertical profile measurements were made using multi-axis differential optical absorption spectroscopy (MAX-DOAS) and mini-Micropulse LiDAR (MPL) at One Tree Island in the Southern Great Barrier Reef from February to April 2023. This is an understudied location in terms of atmospheric aerosols and chemistry but is growing in importance as multiple research streams examine the influence of aerosols on radiation over the Great Barrier Reef. Solar radiation management proposals require regional-scale aerosol modelling, which is evaluated against aerosol extinction and optical depth measurements, necessitating a thorough understanding of measurements of these quantities. MPL aerosol retrieval showed extinction-to-backscatter ratios (0.031 on average) and depolarization ratios (0.015 on average) consistent with clean, unpolluted Southern hemispheric marine aerosol. The maximum depolarization ratio tended to be above the layer of maximum MPL backscatter, which is attributed to dried sea-salt layers above the boundary layer. MAX-DOAS and MPL extinction profiles show aerosol layers extending beyond 2 km altitude in the middle of the day, but predominantly below 1 km at other times. We also compared aerosol optical depth measurements from integrating the MAX-DOAS and MPL extinction profiles, with observations from a hand-held Microtops sun photometer. Mean aerosol optical depth (AOD) values across the campaign compare well, being 0.083 ± 0.002 for the Microtops, 0.090 ± 0.032 for the MAX-DOAS and 0.104 ± 0.028 for the MPL. However, AOD observations at a given time, and the AOD diurnal cycle, often varied between instruments. This likely indicates strong horizontal inhomogeneity in aerosol in this environment, a factor which makes it challenging to accurately compare AOD estimates from different viewing geometries, but which is important for future aerosol modelling studies in this region to consider.

中文翻译：

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测量报告：使用激光雷达和 MAX-DOAS 测量对南部大堡礁进行气溶胶垂直剖面分析


摘要。 2023 年 2 月至 4 月，使用多轴差分光学吸收光谱 (MAX-DOAS) 和迷你微脉冲激光雷达 (MPL) 在大堡礁南部的一树岛进行了气溶胶垂直剖面测量。这是一个尚未得到充分研究的地点大气气溶胶和化学的重要性，但随着多个研究流研究气溶胶对大堡礁辐射的影响，其重要性日益增加。太阳辐射管理建议需要区域规模的气溶胶建模，根据气溶胶消光和光学深度测量对其进行评估，因此需要彻底了解这些量的测量。 MPL 气溶胶反演显示消光与后向散射比（平均 0.031）和去极化比（平均 0.015）与干净、未污染的南半球海洋气溶胶一致。最大退偏振比往往位于最大 MPL 反向散射层之上，这归因于边界层之上的干燥海盐层。 MAX-DOAS 和 MPL 消光剖面显示，气溶胶层在中午延伸到 2 公里高度以上，但在其他时间主要延伸到 1 公里以下。我们还将 MAX-DOAS 和 MPL 消光剖面集成的气溶胶光学深度测量结果与手持式 Microtops 太阳光度计的观测结果进行了比较。整个活动的平均气溶胶光学深度 (AOD) 值比较良好，Microtops 为 0.083 ± 0.002，MAX-DOAS 为 0.090 ± 0.032，MPL 为 0.104 ± 0.028。然而，给定时间的 AOD 观测值以及 AOD 昼夜周期通常因仪器而异。 这可能表明该环境中气溶胶存在强烈的水平不均匀性，这一因素使得准确比较不同观察几何形状的 AOD 估计值具有挑战性，但这对于该地区未来的气溶胶建模研究很重要。