法国留尼汪岛 Maïdo 超级站点的多波长气溶胶激光雷达:仪器描述、数据处理链和质量评估

IF 11.2 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY
Dominique Gantois, Guillaume Payen, Michaël Sicard, Valentin Duflot, Nicolas Marquestaut, Thierry Portafaix, Sophie Godin-Beekmann, Patrick Hernandez, Eric Golubic
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引用次数: 0

摘要

摘要了解气溶胶和云的光学和辐射特性对于减少气候模式的不确定性至关重要。十多年来,留尼旺大气物理观测站(OPAR)一直在运行三台主动激光雷达仪器(分别名为 Li1200、LiO3S 和 LiO3T),提供 3 至 45 千米的气溶胶消光系数、355 和 532 纳米波长的后向散射系数以及 532 纳米波长的线性去极化率的垂直剖面时间序列。这项工作对三个系统进行了全面的技术描述,详细介绍了信号预处理和处理所选用的方法,并进行了不确定性分析。对大约 1737 个夜间平均剖面图进行了人工筛选,以提供无云和无伪影的剖面图。数据处理包括 Klett 反演,从预处理文件中检索气溶胶光学产品。雨季和节假日期间的测量频率较低。Li1200 和 LiO3S 在 355 nm 处的平流层 AOD(0.001-0.107;R = 0.92 ± 0.01)以及 LiO3T 在安斯特伦指数 355/532 (0.079-1.288;R = 0.90 ± 0.13)方面具有良好的相关性。三个时间序列的气溶胶后向散射系数平均不确定度的最低值分别为:LiO3S 为 64.4 ± 31.6%,Li1200 为 50.3 ± 29.0%,LiO3T 为 69.1 ± 42.7%。由于麦多观测站上空背景气溶胶的消光系数和后向散射系数非常低,因此这三种仪器的相对不确定性都很高。LIO3S 和 Li1200 在 25 公里以上,LiO3T 在 20 公里以上,由于信噪比下降,不确定性增加。LR 是造成 LiO3S 和 Li1200(LiO3T)在 18 公里(10 公里)以下不确定性增加的原因。在 355 纳米波长下,LiO3S 是最稳定的仪器,因为它的技术修改较少,对准误差也较小。Li1200 是一个有价值的补充,可以填补 355 nm 波段 LiO3S 时间序列的空白,或用于中对流层和低对流层的具体案例研究。这项工作中描述的数据可在 https://doi.org/10.26171/rwcm-q370(Gantois 等人,2024 年)上查阅。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiwavelength, aerosol lidars at Maïdo supersite, Reunion Island, France: instruments description, data processing chain and quality assessment
Abstract. Understanding optical and radiative properties of aerosols and clouds is critical to reduce uncertainties in climate models. For over 10 years, the Observatory of Atmospheric Physics of La Réunion (OPAR) has been operating three active lidar instruments (named Li1200, LiO3S and LiO3T) providing time-series of vertical profiles from 3 to 45 km of the aerosol extinction and backscatter coefficients at 355 and 532 nm, as well as the linear depolarization ratio at 532 nm. This work provides a full technical description of the three systems, details about the methods chosen for the signal preprocessing and processing, and an uncertainty analysis. About 1737 night-time averaged profiles were manually screened to provide cloud-free and artifact-free profiles. Data processing consisted in Klett inversion to retrieve aerosol optical products from preprocessed files. The measurement frequency was lower during the wet season and the holiday periods. There is a good correlation between the Li1200 and LiO3S in terms of stratospheric AOD at 355 nm (0.001–0.107; R = 0.92 ± 0.01), and with the LiO3T in terms of Angström exponent 355/532 (0.079–1.288; R = 0.90 ± 0.13). The lowest values of the averaged uncertainty of the aerosol backscatter coefficient for the three time-series are 64.4 ± 31.6 % for the LiO3S, 50.3 ± 29.0 % for the Li1200, and 69.1 ± 42.7 % for the LiO3T. These relative uncertainties are high for the three instruments because of the very low values of extinction and backscatter coefficients for background aerosols above Maïdo observatory. Uncertainty increases due to SNR decrease above 25 km for the LIO3S and Li1200, and 20 km for the LiO3T. The LR is responsible for an uncertainty increase below 18 km (10 km) for the LiO3S and Li1200 (LiO3T). The LiO3S is the most stable instrument at 355 nm due to less technical modifications and less misalignments. The Li1200 is a valuable addition to fill in the gaps in the LiO3S time-series at 355 nm or for specific case-studies about the middle and low troposphere. Data described in this work are available at https://doi.org/10.26171/rwcm-q370 (Gantois et al., 2024).
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来源期刊
Earth System Science Data
Earth System Science Data GEOSCIENCES, MULTIDISCIPLINARYMETEOROLOGY-METEOROLOGY & ATMOSPHERIC SCIENCES
CiteScore
18.00
自引率
5.30%
发文量
231
审稿时长
35 weeks
期刊介绍: Earth System Science Data (ESSD) is an international, interdisciplinary journal that publishes articles on original research data in order to promote the reuse of high-quality data in the field of Earth system sciences. The journal welcomes submissions of original data or data collections that meet the required quality standards and have the potential to contribute to the goals of the journal. It includes sections dedicated to regular-length articles, brief communications (such as updates to existing data sets), commentaries, review articles, and special issues. ESSD is abstracted and indexed in several databases, including Science Citation Index Expanded, Current Contents/PCE, Scopus, ADS, CLOCKSS, CNKI, DOAJ, EBSCO, Gale/Cengage, GoOA (CAS), and Google Scholar, among others.
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