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首页> 外文期刊>Atmospheric research >Aerosol products by CALIOP at 532 nm and by a ground-based Raman lidar at 355 nm: Intercomparison methodology
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Aerosol products by CALIOP at 532 nm and by a ground-based Raman lidar at 355 nm: Intercomparison methodology

机译：CALIOP在532 nm处和地面拉曼激光雷达在355 nm处的气雾剂产品：比对方法

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摘要

A methodology has been implemented to compare ground-based Raman lidar measurements at 355 nm to measurements at 532 nm with the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) onboard the Cloud-Aerosol-Lidar and Infrared-Pathfinder-Satellite-Observation (CALIPSO) and contribute to the validation of level 2 (version 2) aerosol products. In particular, lidar measurements performed at Lecce (40°20'N, 18°6'E) in 2006, 2008, and 2009 within the European Aerosol Research Lidar Network have been compared to CALIOP measurements co-located in time and performed at radial distances from Lecce varying from 6 up to 19 km. Extinction- and backscatter-related Angstrom exponents from sun/sky photometer measurements have synergistically been used to calculate aerosol extinction (a(z)) and backscatter O(z)) coefficients at 532 nm from the ones at 355 nm retrieved from ground-based lidar measurements. Selected clear-sky study-cases have been analyzed to illustrate the implemented methodology and address the difficulties that may occur to fill the missing information of ground based measurements at 532 nm. Direct profile-to-profile comparisons have demonstrated either the reliability of the implemented methodology and the CALIOP capability to detect aerosol at least up to -0.3 km from ground in cloud-free conditions. The agreement on the aerosol layer top height is within ±0.1 km for the selected study cases. It has been shown that the spatial variability of aerosols can greatly complicate the validation of CALIOP backscatter and extinction coefficient profiles by direct comparison with corresponding profiles from ground-based instruments co-located in time, but not in space.
机译：已实施一种方法来比较355 nm的地面拉曼激光雷达测量值与Cloud-Aerosol-Lidar和红外Pathfinder-Satellite-Observation卫星上带有正交偏振（CALIOP）的Cloud-Aerosol Lidar的测量结果（CALIPSO ），并有助于2级（版本2）气雾剂产品的验证。尤其是，已将2006年，2008年和2009年在欧洲气溶胶研究激光雷达网络的莱切（40°20'N，18°6'E）进行的激光雷达测量结果与在时间上同位置并在径向进行的CALIOP测量结果进行了比较莱切的距离从6到19公里不等。来自太阳/天空光度计测量的与消光和背向散射相关的Angstrom指数已被协同用于计算从355 nm处从地面获取的消光系数（a（z））和背向散射O（z））在532 nm处的消光系数激光雷达测量。已对选定的晴空研究案例进行了分析，以说明实施的方法并解决在填充532 nm地面测量的丢失信息时可能遇到的困难。直接的轮廓到轮廓的比较已经证明了所实施方法的可靠性以及CALIOP在无云条件下检测至少距离地面-0.3 km的气溶胶的能力。对于选定的研究案例，气溶胶层顶部高度的协议在±0.1 km之内。研究表明，气溶胶的空间变异性可以通过与时空共存但不在空间中的地基仪器的相应廓线直接进行比较，极大地使CALIOP背向散射和消光系数廓线的验证复杂化。

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