EARLINET lidar quality assurance tools

Freudenthaler, Volker; Linné, Holger; Chaikovski, Anatoli; Rabus, D.; Groß, Silke

doi:10.5194/amt-2017-395

Cited by 61 publications

(93 citation statements)

References 16 publications

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“…Consequently, as far as the daytime measurements are concerned, we preferred to use only measurements performed between 10:00 and 13:00 UTC. After sunset, the boundary layer collapses fast, and the stable boundary layer (SBL) forms typically less than 0.5 km above the ground (Garratt, 1992;Mehta et al, 2017). The mixing mechanisms are restricted within this layer during the night.…”

Section: Boundary Layer Height Detectionmentioning

confidence: 99%

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Are EARLINET and AERONET climatologies consistent? The case of Thessaloniki, Greece

et al. 2018

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Abstract. In this study we investigate the climatological behavior of the aerosol optical properties over Thessaloniki during the years [2003][2004][2005][2006][2007][2008][2009][2010][2011][2012][2013][2014][2015][2016][2017]. For this purpose, measurements of two independent instruments, a lidar and a sunphotometer, were used. These two instruments represent two individual networks, the European Lidar Aerosol Network (EAR-LINET) and the Aerosol Robotic Network (AERONET). They include different measurement schedules. Fourteen years of lidar and sunphotometer measurements were analyzed, independently of each other, in order to obtain the annual cycles and trends of various optical and geometrical aerosol properties in the boundary layer, in the free troposphere, and for the whole atmospheric column. The analysis resulted in consistent statistically significant and decreasing trends of aerosol optical depth (AOD) at 355 nm of −23.2 and −22.3 % per decade in the study period over Thessaloniki for the EARLINET and the AERONET datasets, respectively. Therefore, the analysis indicates that the EAR-LINET sampling schedule can be quite effective in producing data that can be applied to long-term climatological studies. It is also shown that the observed decreasing trend is mainly attributed to changes in the aerosol load inside the boundary layer. Seasonal profiles of the most dominant aerosol mixture types observed over Thessaloniki have been generated from the lidar data. The higher values of the vertically resolved extinction coefficient at 355 nm appear in summer, while the lower ones appear in winter. The dust component is more dominant in the free troposphere than in the boundary layer during summer. The biomass burning layers tend to arrive in the free troposphere during spring and summer. This kind of information can be quite useful for applications that require a priori aerosol profiles. For instance, they can be utilized in models that require aerosol climatological data as input, in the development of algorithms for satellite products, and also in passive remote-sensing techniques that require knowledge of the aerosol vertical distribution.

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Section: Boundary Layer Height Detectionmentioning

confidence: 99%

“…These campaigns aimed to establish the standard methods that can be utilized by all the stations. Additionally, some quality standards have been established, in order to make the lidar products of the different systems comparable and to be able to provide quality-assured datasets of network products (Freudenthaler et al, 2018).…”

Section: Dataset Overviewmentioning

confidence: 99%

Are EARLINET and AERONET climatologies consistent? The case of Thessaloniki, Greece

et al. 2018

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“…optical misalignment, detector saturation, experimental setup, electronic problems) leading to systematic errors in the aerosol products, and to figure out technical solutions to fix instrumental problems. As a first step, a set of tests are performed for each optical channel to check the optical alignment (Rayleigh-fit and telecover tests), the trigger delay, the dark current (to evidence electronic distortions), the detector saturation and several instrumental parameters [4]. As a second step, the range corrected signals (RCS) are compared in terms of relative differences in the PBL, in the layers and on the whole measurement range.…”

Section: Methodsmentioning

confidence: 99%

ATHLI16: the ATHens Lidar Intercomparison campaign

et al. 2018

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The results of the ATHLI16 (ATHens Lidar Intercomparison) campaign, held in Athens from 26/09 to 07/10 2016 are presented. The campaign was performed within the Lidar Calibration Centre activities (EU H2020 ACTRIS-2 project) to assess the performance of the EOLE lidar system (NTUA, Athens, Greece), operating within EARLINET, by comparing against the EARLINET reference lidar system MUSA (CNR-IMAA, Potenza, Italy). For both lidars only products retrieved by the EARLINET Single Calculus Chain have been compared.

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“…In Fig. 10 those signals are plotted and compared with the molecular RCS as in the 'Rayleigh-fit' quality assurance test that is standardized in EARLINET [37]. A moving average of 150 m and 375 m has been applied for elastic and RR signals, respectively.…”

Section: Daytime Profilesmentioning

confidence: 99%

Implementation of UV rotational Raman channel to improve aerosol retrievals from multiwavelength lidar

Ortiz-Amezcua¹,

Bedoya-Velásquez²,

Benavent-Oltra³

et al. 2020

Opt. Express

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Vibrational Raman effect is widely used in atmospheric lidar systems, but rotational Raman present several advantages. We have implemented a new setup in the ultraviolet branch of an existing multiwavelength lidar system to collect signal from rotational Raman lines of Oxygen and Nitrogen. We showed that, with an appropriate filter wavelength selection, the systematic error introduced in the particle optical properties due to temperature dependence was less than 4 %. With this new setup, we have been able to retrieve aerosol extinction and backscatter coefficients profiles at 355 nm with 1-h time resolution during daytime and up to 1-min time resolution during nighttime.

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EARLINET lidar quality assurance tools

Cited by 61 publications

References 16 publications

Are EARLINET and AERONET climatologies consistent? The case of Thessaloniki, Greece

Are EARLINET and AERONET climatologies consistent? The case of Thessaloniki, Greece

ATHLI16: the ATHens Lidar Intercomparison campaign

Implementation of UV rotational Raman channel to improve aerosol retrievals from multiwavelength lidar

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