DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy Long-Term EARLINET Dust Observations L. Mona 1* , V. Amiridis 2 , A. Amodeo 1 , G. D’amico 1 , A. Schwarz 3 , N. Papagiannopoulos 1 , A. Papayannis 4 , M. Sicard 5 , U. Wandinger 3 , A. Comeron 5 , G. Pappalardo 1 1 CNR-IMAA, Potenza, Italy 2 National Observatory of Athens Greece 3 TROPOS, Leipzig, Germany 4 NTUA, Athens, Greece 5 Universitat Politècnica de Catalunya, Barcelona, Spain and the EARLINET team
Long-Term EARLINET Dust Observations L. Mona 1* , V. Amiridis 2 , A. Amodeo 1 , G. D’amico 1 , A. Schwarz 3 , N. Papagiannopoulos 1 , A. Papayannis 4 , M. Sicard 5 , U. Wandinger 3 , A. Comeron 5 , G. Pappalardo 1 1 CNR-IMAA, Potenza, Italy 2 National Observatory of Athens Greece - PowerPoint PPT Presentation
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DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Long-Term EARLINET Dust Observations
L. Mona1*, V. Amiridis2, A. Amodeo1, G. D’amico1, A. Schwarz 3, N. Papagiannopoulos1, A. Papayannis 4, M. Sicard5, U. Wandinger3, A.
Comeron5, G. Pappalardo1
1CNR-IMAA, Potenza, Italy2 National Observatory of Athens
Greece3TROPOS, Leipzig, Germany
4 NTUA, Athens, Greece5Universitat Politècnica de Catalunya, Barcelona, Spain
and the EARLINET team
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
EARLINET-ASOS
www.earlinet.org
EARLINET (European Aerosol Research LIdar NETwork)
● since 2000
● 27 lidar stations
-10 multiwavelength Raman lidar stations
-10 Raman lidar stations
- 7 single backscatter lidar stations
● comprehensive, quantitative, and statistically significant data base
● Continental and long-term scale
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
EARLINETEARLINET started in 2000 under FP5 based on research
aerosol lidar stations already available around Europe.
Different lidar set-ups and software analysis around the network.
Main strengths of the network: sharing the single station know-how for a continuous improvement of the network as a whole and acting as a single body.
EARLINET pillars:
Quality assurance
Optimization of the instruments
Optimization of the data processing
Centralized measurements scheduling
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Lidar Range Corrected Signal: almost raw signal unless background subtraction and multiple by range^2
provides rapid snapshot of temporal - vertical evolution of aerosol layers
Pappalardo et al., GRL, 2004, Villani et al., JGR 2006, Wang et al., Atm. Env. 2008
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
EARLINET standard products :
-Aerosol backscatter coefficient (355, 532 and 1064 nm)
-Aerosol extinction coefficient (355 and 532nm)
-Linear particle depolarization ratio (355 and 532 nm)
These quantities are reported in the EARLINET database in the netcdf standardized format.
EARLINET products
-Lidar Ratio(355 and 532 nm)
-Angstrom exponent (355 and 532nm)
-Backscatter related Angstrom exponent(355 -532 nm , 532-1064 nm)
These are important for the aerosol typing because do not depend on aerosol quantity.
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
EARLINET products
FT layer
PBL
AODUV=0.26AODVIS=0.19
AODUV=0.17AODVIS=0.11
SUV=51±10 srSVIS=53±8 sr
Å = 0.9 ± 0.2
δ=0.12±0.03
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
A suitable observing methodology has been established within the network for studying Saharan dust events.
Measurements are performed in correspondence of alerts based on the operational model outputs diffused 24 to 36 hours prior to the arrival of dust aerosols .
Typically measurements are performed for more than 3 hours to investigate the temporal evolution of the dust events.
All these data are collected in the Saharan dust EARLINET subset.
Subset published on CERA database:
doi:10.1594/WDCC/EN_SaharanDust_2000-2010
EARLINET desert dust observations
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Systematic dust observations over EuropeFirst study on the impact of Saharan dust on European aerosol content during the first period of operation of the network (2000–2002)
Central Europe shows low dust transport activity
Papayannis et al. JGR 2008
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Systematic dust observations over EuropeAOD at 351–355nm inside the dust lofted layers
Values in 0.1 -0.25 range with a standard deviation of the order of 20–100% that clearly indicates the high variability of the dust outbreaks
over Europe.
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Systematic dust observations over Europe
S values ranged between 38 and 60 sr inside the dust layer,while their standard deviation is of the order of 20–30%.
Papayannis et al. JGR 2008
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Typical values of intensive propertiesNorthern Europe
linear particle depolarization ratio values range from 10 to 25% at 532nm
approximately constant A° (β355/532) values (−0.5 to 1)
approximately constant S values (30 to 80 sr)
Southern Europe
S (20 to 100 sr) with high variability
A° (β355/532) (−0.5 to 3) highly variable
linear particle depolarization ratio values as high as 35 % at 532nm
Cyprus: a new EARLINET station for Arabian dust
S at 532 nm between 34 – 39 sr for dust event in 2011
28%–35% linear particle depolarization ratio
Mamouri et al., GRL 2013
Papayannis et al. JGR 2008
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Among cases in May 2008–October 2009 period:
• only 12% of cases pure Saharan dust cases
• Mixing of dust with others in 88% of the cases
• The mixtures of dust, pollution, and marine aerosol are the most frequently obtained.
Dust mixture
All mixtures lie on nearly straight connecting lines
between their constituents.
Wandinger, Executive summary ESTEC, 2011
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Satellite validation: CALIOP Lev2 dataCriteria: 100 km of distance (maximum)
largest single station databases.
2.5-5km: Scal=41.1 sr vs Sear=47.7sr with 7 sr bias. This is probably due to the Saharan dust occurrences at this altitude range and stations.
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Satellite validation: CALIOP Lev2 dataObservations (airborne in situ + lidar ) in pure dust in the Saharan plume (SAMUM campaign) :
• in the CALIPSO retrieval of backscatter coefficients, the a priori lidar ratios from the lookup table of 40 sr used for dust represents an effective value that accounts well for the reduced attenuation caused by multiple scattering
• the CALIPSO extinction values calculated by multiplying the backscatter values with the effective lidar ratio, a systematic underestimation of extinction, and thus in optical depth by 10%–40%
Wandinger et al GRL 2011
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
Potenza (Italy) station selected as the site with the largest database of dust profiles.
Comparison for May 2000 – June 2012 period between lidar observations and BSC-DREAM8b forecasts over Potenza.
Only cases in which a Saharan dust layer is identified in the lidar profiles are compared.
Comparison is performed in terms of dust layer geometrical properties (base, top, extension and center of mass) and of dust extinction properties.
EARLINET vs BSCDREAM-8b12-year one site systematic comparison
Mona et al. ACP 2014 - on review
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
EARLINET vs BSCDREAM-8b12-year one site systematic comparison
Geometrical features of dust layer are well described by the model in terms of center of mass.
Good correlation between optical properties and concentration profiles apart from cases with low dust load (AOD <0.1)
Mona et al. ACP 2014 - on review
DUST 2014, 1-6 June 2014, Castellaneta Marina, Italy
EARLINET vs BSCDREAM-8b12-year one site systematic comparison