Retrieval of optical and microphysical properties of transported Saharan dust over Athens and Granada based on multi-wavelength Raman lidar measurements: Study of the mixing processes

Σουπιωνά, Ουρανία; Samaras, Stefanos; Ortiz-Amezcua, Pablo; Böckmann, Christine; Papayannis, A.; Moreira, Gregori Arruda; Benavent-Oltra, José Antonio; Guerrero-Rascado, Juan Luís; Bedoya-Velásquez, Andrés Esteban; Olmo, F.J.; Román, Roberto; Kokkalis, P.; Mylonaki, Maria; Alados-Arboledas, L.; Papanikolaou, Christiana Anna; Foskinis, Romanos

doi:10.1016/j.atmosenv.2019.116824

Cited by 32 publications

(24 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies based on CALIPSO data obtained over the mid and high latitudes, showed that BB plumes can be equally injected within the mixing layer (50%) and the free troposphere (50%) [ 13 , 16 ]. On the other hand, the LPDR values ( Figure 9 c) for the smoke mixtures with dust ranged from 0.10 ± 0.05 to 0.20 ± 0.04, in all subregions, which is in accordance with values previously found in the literature [ 19 , 21 , 37 , 38 , 39 ]. The relevant values for the pure smoke aerosols were found equal to 0.05 ± 0.04, again in agreement with literature findings [ 7 , 17 , 40 ].…”

Section: Resultssupporting

confidence: 90%

“…In R2, the AΕ mean values were found equal to 0.6 for smoke mixed with marine aerosol layers, and to 1.6 ± 0.1 for smoke mixed with dust aerosols. In R3 and R4 subregions, the values of AΕ ranged from 0.7 to 1.5 and 0.9 to 1.2, respectively, again in agreement with values found in the literature for pure smoke and smoke mixtures [ 22 , 38 , 40 , 41 ].…”

Section: Resultssupporting

confidence: 89%

See 1 more Smart Citation

Canadian Biomass Burning Aerosol Properties Modification during a Long-Ranged Event on August 2018

Papanikolaou

Giannakaki

Papayannis

et al. 2020

Sensors

View full text Add to dashboard Cite

The aim of this paper is to study the spatio-temporal evolution of a long-lasting Canadian biomass burning event that affected Europe in August 2018. The event produced biomass burning aerosol layers which were observed during their transport from Canada to Europe from the 16 to the 26 August 2018 using active remote sensing data from the space-borne system Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO). The total number of aerosol layers detected was 745 of which 42% were identified as pure biomass burning. The remaining 58% were attributed to smoke mixed with: polluted dust (34%), clean continental (10%), polluted continental (5%), desert dust (6%) or marine aerosols (3%). In this study, smoke layers, pure and mixed ones, were observed by the CALIPSO satellite from 0.8 and up to 9.6 km height above mean sea level (amsl.). The mean altitude of these layers was found between 2.1 and 5.2 km amsl. The Ångström exponent, relevant to the aerosol backscatter coefficient (532/1064 nm), ranged between 0.9 and 1.5, indicating aerosols of different sizes. The mean linear particle depolarization ratio at 532 nm for pure biomass burning aerosols was found equal to 0.05 ± 0.04, indicating near spherical aerosols. We also observed that, in case of no aerosol mixing, the sphericity of pure smoke aerosols does not change during the air mass transportation (0.05–0.06). On the contrary, when the smoke is mixed with dessert dust the mean linear particle depolarization ratio may reach values up to 0.20 ± 0.04, especially close to the African continent (Region 4).

show abstract

Section: Resultssupporting

confidence: 90%

Section: Resultssupporting

confidence: 89%

Canadian Biomass Burning Aerosol Properties Modification during a Long-Ranged Event on August 2018

Papanikolaou

Giannakaki

Papayannis

et al. 2020

Sensors

View full text Add to dashboard Cite

show abstract

“…The back-trajectories ( Figure 7) show that the air masses present over Transylvania-Cluj-Napoca station on April the 24th 2019 during the lidar measurements originated from the Saharan desert. Similar to the [60] study, we can analyze the air masses dynamics using Figure 7. For the trajectories that were obtained for a period of 72 hours backward in time, the traveling time from the African continent to the detection station (after leaving the African continent) is less than 48 hours, which comes in support of the previous assumption that the dust plume is relatively pure.…”

Section: Modelling Data Analysismentioning

confidence: 99%

Multi-Sensor Observation of a Saharan Dust Outbreak over Transylvania, Romania in April 2019

et al. 2020

View full text Add to dashboard Cite

Mineral aerosols are considered to be the second largest source of natural aerosol, the Saharan desert being the main source of dust at global scale. Under certain meteorological conditions, Saharan dust can be transported over large parts of Europe, including Romania. The aim of this paper is to provide a complex analysis of a Saharan dust outbreak over the Transylvania region of Romania, based on the synergy of multiple ground-based and satellite sensors in order to detect the dust intrusion with a higher degree of certainty. The measurements were performed during the peak of the outbreak on April the 24th 2019, with instruments such as a Cimel sun-photometer and a multi-wavelength Raman depolarization lidar, together with an in-situ particle counter measuring at ground level. Remote sensing data from MODIS sensors on Terra and Aqua were also analyzed. Results show the presence of dust aerosol layers identified by the multi-wavelength Raman and depolarization lidar at altitudes of 2500–4000 m, and 7000 m, respectively. The measured optical and microphysical properties, together with the HYSPLIT back-trajectories, NMMB/BSC dust model, and synoptic analysis, confirm the presence of lofted Saharan dust layers over Cluj-Napoca, Romania. The NMMB/BSC dust model predicted dust load values between 1 and 1.5 g/m2 over Cluj-Napoca at 12:00 UTC for April the 24th 2019. Collocated in-situ PM monitoring showed that dry deposition was low, with PM10 and PM2.5 concentrations similar to the seasonal averages for Cluj-Napoca.

show abstract

“…The analysis of 5 d backward trajectories (Fig. 1) computed by the HYSPLIT model (Hybrid Single-Particle Lagrangian Integrated Trajectory; Stein et al, 2015;Rolph, 2016) indicate that the air masses that arrived at Granada came from a south-western direction on 18 and 21 July 2016. These air masses from the Sahara area passed along south Morocco and the Moroccan coast before reaching Granada.…”

Section: Dust Event During Slope I Campaignmentioning

confidence: 99%

Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm

et al. 2019

View full text Add to dashboard Cite

Abstract. This study evaluates the potential of the GRASP algorithm (Generalized Retrieval of Aerosol and Surface Properties) to retrieve continuous day-to-night aerosol properties, both column-integrated and vertically resolved. The study is focused on the evaluation of GRASP retrievals during an intense Saharan dust event that occurred during the Sierra Nevada Lidar aerOsol Profiling Experiment I (SLOPE I) field campaign. For daytime aerosol retrievals, we combined the measurements of the ground-based lidar from EARLINET (European Aerosol Research Lidar Network) station and sun–sky photometer from AERONET (Aerosol Robotic Network), both instruments co-located in Granada (Spain). However, for night-time retrievals three different combinations of active and passive remote-sensing measurements are proposed. The first scheme (N0) uses lidar night-time measurements in combination with the interpolation of sun–sky daytime measurements. The other two schemes combine lidar night-time measurements with night-time aerosol optical depth obtained by lunar photometry either using intensive properties of the aerosol retrieved during sun–sky daytime measurements (N1) or using the Moon aureole radiance obtained by sky camera images (N2). Evaluations of the columnar aerosol properties retrieved by GRASP are done versus standard AERONET retrievals. The coherence of day-to-night evolutions of the different aerosol properties retrieved by GRASP is also studied. The extinction coefficient vertical profiles retrieved by GRASP are compared with the profiles calculated by the Raman technique at night-time with differences below 30 % for all schemes at 355, 532 and 1064 nm. Finally, the volume concentration and scattering coefficient retrieved by GRASP at 2500 m a.s.l. are evaluated by in situ measurements at this height at Sierra Nevada Station. The differences between GRASP and in situ measurements are similar for the different schemes, with differences below 30 % for both volume concentration and scattering coefficient. In general, for the scattering coefficient, the GRASP N0 and N1 show better results than the GRASP N2 schemes, while for volume concentration, GRASP N2 shows the lowest differences against in situ measurements (around 10 %) for high aerosol optical depth values.

show abstract

Retrieval of optical and microphysical properties of transported Saharan dust over Athens and Granada based on multi-wavelength Raman lidar measurements: Study of the mixing processes

Cited by 32 publications

References 93 publications

Canadian Biomass Burning Aerosol Properties Modification during a Long-Ranged Event on August 2018

Canadian Biomass Burning Aerosol Properties Modification during a Long-Ranged Event on August 2018

Multi-Sensor Observation of a Saharan Dust Outbreak over Transylvania, Romania in April 2019

Different strategies to retrieve aerosol properties at night-time with the GRASP algorithm

Contact Info

Product

Resources

About