Retrieval of aerosol extinction-to-backscatter ratios by combining ground-based and space-borne lidar elastic scattering measurements

Lu, Xiaomei; Jiang, Yuesong; Zhang, Xuguo; Wang, X.; Nasti, Libera; Spinelli, N.

doi:10.1364/oe.19.000a72

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Raman lidar systems are now widely used for profiling vertical distributions of aerosol in the atmosphere (Amiridis et al, 2011;Groß et al;Lu et al, 2011). Depending on the sophistication of the instrument the shape and microphysics of aerosol particles can be established.…”

Section: Introductionmentioning

confidence: 99%

Typical tropospheric aerosol backscatter profiles for Southern Ireland: The Cork Raman lidar

McAuliffe

Ruth

2013

Atmospheric Research

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Section: Introductionmentioning

confidence: 99%

Typical tropospheric aerosol backscatter profiles for Southern Ireland: The Cork Raman lidar

McAuliffe

Ruth

2013

Atmospheric Research

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“…Several studies (e.g., Tao et al, 2008;Lu et al, 2011;Ferrare et al, 2001;Müller et al, 2007;Haarig et al, 2016) investigated the LR for different atmospheric conditions and aerosol types, like dust in Groß et al (2011) and volcanic ash in Ansmann et al (2010). The studies showed that the LR is a highly variable parameter depending on the predominant aerosol.…”

Section: Ground-based Remote Sensingmentioning

confidence: 99%

Helicopter-borne observations of the continental background aerosol in combination with remote sensing and ground-based measurements

et al. 2018

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Abstract. This paper examines the representativeness of ground-based in situ measurements for the planetary boundary layer (PBL) and conducts a closure study between airborne in situ and ground-based lidar measurements up to an altitude of 2300 m. The related measurements were carried out in a field campaign within the framework of the HighDefinition Clouds and Precipitation for Advancing Climate Prediction (HD(CP) 2 ) Observational Prototype Experiment (HOPE) in September 2013 in a rural background area of central Europe.The helicopter-borne probe ACTOS (Airborne Cloud and Turbulence Observation System) provided measurements of the aerosol particle number size distribution (PNSD), the aerosol particle number concentration (PNC), the number concentration of cloud condensation nuclei (CCN-NC), and meteorological atmospheric parameters (e.g., temperature and relative humidity). These measurements were supported by the ground-based 3 + 2 wavelength polarization lidar system Polly XT , which provided profiles of the particle backscatter coefficient (σ bsc ) for three wavelengths (355, 532, and 1064 nm). Particle extinction coefficient (σ ext ) profiles were obtained by using a fixed backscatter-to-extinction ratio (also lidar ratio, LR). A new approach was used to determine profiles of CCN-NC for continental aerosol. The results of this new approach were consistent with the airborne in situ measurements within the uncertainties.In terms of representativeness, the PNSD measurements on the ground showed a good agreement with the measurements provided with ACTOS for lower altitudes. The ground-based measurements of PNC and CCN-NC are representative of the PBL when the PBL is well mixed. Locally isolated new particle formation events on the ground or at the top of the PBL led to vertical variability in the cases presented here and ground-based measurements are not entirely representative of the PBL.Based on Mie theory (Mie, 1908), optical aerosol properties under ambient conditions for different altitudes were determined using the airborne in situ measurements and were compared with the lidar measurements. The investigation of the optical properties shows that on average the airbornebased particle light backscatter coefficient is 50.1 % smaller for 1064 nm, 27.4 % smaller for 532 nm, and 29.5 % smaller for 355 nm than the measurements of the lidar system. These results are quite promising, since in situ measurement-based Mie calculations of the particle light backscattering are scarce and the modeling is quite challenging. In contrast, for the particle light extinction coefficient we found a good agreement. The airborne-based particle light extinction coefficient was just 8.2 % larger for 532 nm and 3 % smaller for 355 nm, for an assumed LR of 55 sr. The particle light extinction coefficient for 1064 nm was derived with a LR of 30 sr. For this wavelength, the airborne-based particle light extinction coefficient is 5.2 % smaller than the lidar measurements. For the first time, the lidar ratio of 30 sr for 1064 nm was det...

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“…The dynamic shape factor is represented by χ. In this study we assumed an effective aerosol particle density of 1.6 g cm −3 , according to Ma et al (2014), for the fine-mode aerosol. The effective density combines the particle density and dynamic shape factor.…”

Section: Particle Number Size Distributionmentioning

confidence: 99%

“…The mixing state can be assumed by different mixing approaches. The dry-state optical closure study by Ma et al (2014) shows that the approach of internally mixed coated (aerosol particles consists of a core surrounded by a shell; core-shell approach) aerosol particles results in the best agreement between modeled and measured hemispheric backscatter coefficients for Melpitz. Furthermore, Zhang and Thompson (2014) and Kahnert et al (2012) discussed the mixing morphology and its influence on particle light absorption and scattering.…”

Section: Airborne In Situ Aerosol Optical Propertiesmentioning

confidence: 99%

Helicopter-borne observations of the continental background aerosol in combination with remote sensing and ground-based measurements

Düsing¹,

Wehner²,

Seifert³

et al. 2017

Preprint

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Abstract. This study presents vertical pro&#64257;les up to a height of 2300&#8201;m&#8201;a.s.l. of aerosol microphysical and optical properties and cloud condensation nuclei (CCN). Corresponding data have been measured during a &#64257;eld campaign as part of the High-De&#64257;nition Clouds and Precipitation for Advancing Climate Prediction (HD(CP)2) Observational Prototype Experiments (HOPE), which took place at Melpitz, Germany from September 9 to 29, 2013. The helicopter-borne payload ACTOS (Airborne Cloud and Turbulence Observation System) was used to determine the aerosol particle number size distribution (PNSD), the number concentrations of aerosol particles (PNC) and cloud condensation nuclei (CCN) (CCN-NC), the ambient relative humidity (RH), and temperature (T). Simultaneous measurements on ground provided a holistic view on aerosol microphysical properties such as the PNSD, the chemical composition and the CCN-NC. Additional measurements of a 3&#8201;+&#8201;2 wavelength polarization lidar system (PollyXT) provided pro&#64257;les of the aerosol particle light backscatter coef&#64257;cient (&#963;bsc) for three wavelengths (355, 532 and 1064&#8201;nm). From profiles of &#963;bsc profiles of the aerosol particle light extinction coefficient (&#963;ext) were determined using the extinction-to-backscatter ratio. Furthermore, CCN-NC profiles were estimated on basis of the lidar-measurements. Ambient state optical properties of aerosol particles were derived on the basis of airborne in situ measurements of ACTOS (PNSD) and in situ measurements on ground (chemical aerosol characterization) using Mie-theory. On the basis of ground-based and airborne measurements, this work investigates the representativeness of ground-based aerosol microphysical properties for the boundary layer for two case-studies. The PNSD measurements on ground showed a good agreement with the measurements provided with ACTOS for lower altitudes. The ground-based measurements of PNC and CCN-NC are representative for the PBL when the PBL is well mixed. Locally isolated new particle formation events on ground or at the top of the PBL led to vertical variability in the here presented cases and ground-based measurements are not representative for the PBL. Furthermore, the lidar-based estimates of CCN-NC profiles were compared with the airborne in situ measurements of ACTOS. This comparison showed good agreements within the uncertainty range. Finally, this work provides a closure study between the optical aerosol particle properties in ambient state based on the airborne ACTOS measurements and derived with the lidar measurements. The investigation of the optical properties shows for 14 measurement-points that the airborne-based particle light backscatter coefficient is for 1064&#8201;nm 50&#8201;% smaller than the measurements of the lidar system, 27.6&#8201;% smaller for 532&#8201;nm and 29.9&#8201;% smaller for 355&#8201;nm. These results are quite promising, since in-situ measurement based Mie-calculations of the particle light backscattering are scarce and the modelling is quite challenging. In contradiction for the particle light extinction coefficient retrieved from the airborne in situ measurements were found a good agreement. The airborne-based particle light extinction coefficient was just 7.9&#8201;% larger for 532&#8201;nm and 3.5&#8201;% smaller for 355&#8201;nm, for an assumed lidar ratio (LR) of 55&#8201;sr. The particle light extinction coefficient for 1064&#8201;nm was derived with a LR of 30&#8201;sr. For this wavelength, the airborne-based particle light extinction coefficient is 5.2&#8201;% smaller than the lidar-measurements. Also, the correlation for the particle light extinction coefficient in combination with Mie-based LR's are in agreement for typical LR's of European background aerosol.

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Retrieval of aerosol extinction-to-backscatter ratios by combining ground-based and space-borne lidar elastic scattering measurements

Cited by 8 publications

References 15 publications

Typical tropospheric aerosol backscatter profiles for Southern Ireland: The Cork Raman lidar

Typical tropospheric aerosol backscatter profiles for Southern Ireland: The Cork Raman lidar

Helicopter-borne observations of the continental background aerosol in combination with remote sensing and ground-based measurements

Helicopter-borne observations of the continental background aerosol in combination with remote sensing and ground-based measurements

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