Systematic lidar observations of Saharan dust layers over Athens, Greece in the frame of EARLINET project (2004–2006)

Papayannis, A.; Mamouri, Rodanthi-Elisavet; Amiridis, Vassilis; Kazadzis, Stelios; García‐Pando, Carlos Pérez; Tsaknakis, G.; Kokkalis, Panagiotis; Baldasano, J. M.

doi:10.5194/angeo-27-3611-2009

Cited by 60 publications

(68 citation statements)

References 56 publications

(60 reference statements)

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“…This behavior could result in the different mean lidar ratios between summer and the other two seasons. The BAE ranges mostly between 0.9 and 1.2 ( Table 4), values that are typical of dust mixture (Papayannis et al, 2009;Baars et al, 2016). Giannakaki et al (2010) report an annual BAE value of 1.5 ± 1.0 sr for this category.…”

Section: Dust Mixturesmentioning

confidence: 99%

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: Dust Mixturesmentioning

confidence: 99%

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

et al. 2018

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“…The trajectories were 120 h (5 days backwards transport period) long. The three altitudes correspond to transport at surface, boundary layer height and free troposphere and are appropriate for identifying Saharan dust transport events over the Eastern Mediterranean, Greece and the greater area of Athens (Hamonou et al, 1999;Alpert et al, 2004;Papayannis et al, 2005;Papayannis et al, 2009). Also 3D trajectory data available from the Chemical Co-ordinating Centre of EMEP (EMEP/CCC) calculated using Flextra trajectory model every 6 h were retrieved.…”

Section: Identification Of Desert Dust Intrusion Events Coinciding Wimentioning

confidence: 99%

Identification of the Influence of African Dust on PM10 Concentrations at the Athens Air Quality Monitoring Network during the Period 2001-2010

Aleksandropoulou

Lazaridis

2013

Aerosol Air Qual. Res.

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The objective of this work was to identify Sahara dust intrusions and quantify their contribution to annual and daily PM 10 concentrations over the Athens Metropolitan Area (AMA) during the period 2001-2010. Additionally, extreme PM 10 values attributed to large forest fires and volcanic emissions or the synergy of the above with African dust intrusions have been identified. It was found that the concentrations of PM 10 during the period studied exceeded the European Union's Air Quality Standard (EU AQS) value at most of the traffic urban (TU) stations. Most of the extreme values were attributed to dust events or large forest fires. The contribution from African dust to PM 10 concentrations on days with events and exceedances of the EU AQS was approximately 50% at TU stations and 72% at the background suburban stations (BS). Most of the African dust events contributed about 5 μg/m 3 to 34 μg/m 3 to the daily PM 10 concentrations, whereas the average contribution to annual PM 10 concentrations was approximately 8.6 ± 1.8 μg/m 3 i.e., 22.2 ± 7.5%. During the decade, no clear interannual relationship was observed between the African dust contribution and the frequency and intensity of events. The more frequent and severe episodes occurred during spring, while less frequent and less severe episodes occurred during summer. After the extraction of the African dust load the annual and daily AQS was exceeded in 2010 at only one TU station. The average annual contribution of African dust to the exceedances was approximately 36% at TU stations and 58% at BS stations.

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“…The ability to retrieve information on the spatial structure of aerosols by ground-based remote multiwavelength laser sensing allows for not only the identification of particle layers aloft but also the ability to study transport processes and to lower uncertainty in estimates of radiative forcing that are sensitive to the vertical distribution of aerosols [3]. There is also value in studying the vertical structure of particles in locations close to major dust emissions sources [4]. Therefore, in recent years, Lidar measurements are widely used for studying the spatial and temporal variability of aerosol properties, in particular, during Asian (Aerosol Characterization Experiment-Asia (ACEAsia)) and Near Eastern (Saharan mineral dust experiment (SAMUM)) dust events [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Lidar Measurements of the Vertical Distribution of Aerosol Optical and Physical Properties over Central Asia

Chen

Sverdlik

Imashev

et al. 2013

International Journal of Atmospheric Sciences

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. Lidar measurements were supplemented with surface-based measurements of PM 2.5 and PM 10 mass and chemical composition in both size fractions. Dust transported into the region is common, being detected 33% of the time. The maximum frequency occurred in the spring of 2009. Dust transported to Central Asia comes from regional sources, for example, Taklimakan desert and Aral Sea basin, and from long-range transport, for example, deserts of Arabia, Northeast Africa, Iran, and Pakistan. Regional sources are characterized by pollution transport with maximum values of coarse particles within the planetary boundary layer, aerosol optical thickness, extinction coefficient, integral coefficient of aerosol backscatter, and minimum values of theÅngström exponent. Pollution associated with air masses transported over long distances has different characteristics during autumn, winter, and spring. During winter, dust emissions were low resulting in high values of theÅngström exponent (about 0.51) and the fine particle mass fraction (64%). Dust storms were more frequent during spring with an increase in coarse dust particles in comparison to winter. The aerosol vertical profiles can be used to lower uncertainty in estimating radiative forcing.

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Systematic lidar observations of Saharan dust layers over Athens, Greece in the frame of EARLINET project (2004–2006)

Cited by 60 publications

References 56 publications

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

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

Identification of the Influence of African Dust on PM10 Concentrations at the Athens Air Quality Monitoring Network during the Period 2001-2010

Lidar Measurements of the Vertical Distribution of Aerosol Optical and Physical Properties over Central Asia

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