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首页> 外文期刊>Atmospheric chemistry and physics >Assessment of the CALIPSO Lidar 532 nm attenuated backscatter calibration using the NASA LaRC airborne High Spectral Resolution Lidar
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Assessment of the CALIPSO Lidar 532 nm attenuated backscatter calibration using the NASA LaRC airborne High Spectral Resolution Lidar

机译：使用NASA LaRC机载高光谱分辨率激光雷达评估CALIPSO激光雷达532 nm衰减后向散射校准

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摘要

The Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) instrument on the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) spacecraft has provided global, high-resolution vertical profiles of aerosols and clouds since it became operational on 13 June 2006. On 14 June 2006, the NASA Langley Research Center (LaRC) High Spectral Resolution Lidar (HSRL) was deployed aboard the NASA Langley B-200 aircraft for the first of a series of 86 underflights of the CALIPSO satellite to provide validation measurements for the CALIOP data products. To better assess the range of conditions under which CALIOP data products are produced, these validation flights were conducted under both daytime and nighttime lighting conditions, in multiple seasons, and over a large range of latitudes and aerosol and cloud conditions. This paper presents a quantitative assessment of the CALIOP 532 nm calibration (through the 532 nm total attenuated backscatter) using internally calibrated airborne HSRL underflight data and is the most extensive study of CALIOP 532 nm calibration. Results show that HSRL and CALIOP 532 nm total attenuated backscatter agree on average within 2.7% ± 2.1% (CALIOP lower) at night and within 2.9% ± 3.9% (CALIOP lower) during the day, demonstrating the accuracy of the CALIOP 532 nm calibration algorithms. Additionally, comparisons with HSRL show consistency of the CALIOP calibration before and after the laser switch in 2009 as well as improvements in the daytime version 3.01 calibration scheme compared with the version 2 calibration scheme. Potential biases and uncertainties in the methodology relevant to validating satellite lidar measurements with an airborne lidar system are discussed and found to be less than 4.5% ± 3.2% for this validation effort with HSRL. Results from this study are also compared with prior assessments of the CALIOP 532 nm attenuated backscatter calibration.
机译：自2006年6月13日投入使用以来，“云气溶胶激光雷达和红外探路者卫星观测”（CALIPSO）航天器上的“带有正交极化的云气溶胶激光雷达”仪器已提供了全球高分辨率的气溶胶和云层垂直剖面。 2006年6月14日，NASA兰利B-200飞机上部署了NASA兰利研究中心（LaRC）高光谱激光雷达（HSRL），用于CALIPSO卫星的86架次飞行中的第一批飞行，以提供对CALIOP数据的验证测量产品。为了更好地评估CALIOP数据产品的生产条件范围，这些验证飞行是在白天和夜间的光照条件下，多个季节以及在较大范围的纬度，气溶胶和云条件下进行的。本文使用内部校准的机载HSRL飞行下数据，对CALIOP 532 nm校准（通过532 nm总衰减后向散射）进行了定量评估，是对CALIOP 532 nm校准的最广泛研究。结果表明，HSRL和CALIOP 532 nm的总衰减后向散射在夜间平均平均在2.7％±2.1％（较低的CALIOP）之内，而在白天，则平均在2.9％±3.9％（较低的CALIOP）之内，证明了CALIOP 532 nm校准的准确性算法。此外，与HSRL的比较显示了2009年激光转换前后的CALIOP校准的一致性，以及与版本2校准方案相比白天3.01版校准方案的改进。讨论了与使用机载激光雷达系统验证卫星激光雷达测量相关的方法中的潜在偏差和不确定性，对于使用HSRL进行的这种验证工作，发现该误差和不确定性小于4.5％±3.2％。这项研究的结果也与CALIOP 532 nm衰减后向散射校准的先前评估进行了比较。

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