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Volume 17, issue 9
Atmos. Chem. Phys., 17, 5893-5919, 2017
https://doi.org/10.5194/acp-17-5893-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: EARLINET aerosol profiling: contributions to atmospheric and...

Atmos. Chem. Phys., 17, 5893-5919, 2017
https://doi.org/10.5194/acp-17-5893-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 12 May 2017

Research article | 12 May 2017

Three-dimensional evolution of Saharan dust transport towards Europe based on a 9-year EARLINET-optimized CALIPSO dataset

Eleni Marinou1,2, Vassilis Amiridis1, Ioannis Binietoglou1,3, Athanasios Tsikerdekis5, Stavros Solomos1, Emannouil Proestakis1,4, Dimitra Konsta1, Nikolaos Papagiannopoulos6, Alexandra Tsekeri1, Georgia Vlastou8, Prodromos Zanis5, Dimitrios Balis2, Ulla Wandinger7, and Albert Ansmann7 Eleni Marinou et al.
  • 1IAASARS, National Observatory of Athens, 15236 Athens, Greece
  • 2Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
  • 3National Institute of R&D for Optoelectronics, Magurele, Romania
  • 4Laboratory of Atmospheric Physics, Department of Physics, University of Patras, 26500 Patras, Greece
  • 5School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
  • 6Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l'Analisi Ambientale (CNR–IMAA), Tito Scalo (PZ), Italy
  • 7Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany
  • 8Department of Physics, National and Kapodistrian University of Athens, Athens, Greece

Abstract. In this study we use a new dust product developed using CALIPSO (Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation) observations and EARLINET (European Aerosol Research Lidar Network) measurements and methods to provide a 3-D multiyear analysis on the evolution of Saharan dust over North Africa and Europe. The product uses a CALIPSO L2 backscatter product corrected with a depolarization-based method to separate pure dust in external aerosol mixtures and a Saharan dust lidar ratio (LR) based on long-term EARLINET measurements to calculate the dust extinction profiles. The methodology is applied on a 9-year CALIPSO dataset (2007–2015) and the results are analyzed here to reveal for the first time the 3-D dust evolution and the seasonal patterns of dust over its transportation paths from the Sahara towards the Mediterranean and Continental Europe. During spring, the spatial distribution of dust shows a uniform pattern over the Sahara desert. The dust transport over the Mediterranean Sea results in mean dust optical depth (DOD) values up to 0.1. During summer, the dust activity is mostly shifted to the western part of the desert where mean DOD near the source is up to 0.6. Elevated dust plumes with mean extinction values between 10 and 75Mm−1 are observed throughout the year at various heights between 2 and 6km, extending up to latitudes of 40°N. Dust advection is identified even at latitudes of about 60°N, but this is due to rare events of episodic nature. Dust plumes of high DOD are also observed above the Balkans during the winter period and above northwest Europe during autumn at heights between 2 and 4km, reaching mean extinction values up to 50Mm−1. The dataset is considered unique with respect to its potential applications, including the evaluation of dust transport models and the estimation of cloud condensation nuclei (CCN) and ice nuclei (IN) concentration profiles. Finally, the product can be used to study dust dynamics during transportation, since it is capable of revealing even fine dynamical features such as the particle uplifting and deposition on European mountainous ridges such as the Alps and Carpathian Mountains.

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We provide a 3D multiyear analysis on the evolution of Saharan dust over Europe, using a dust product retrieved from the CALIPSO satellite and using EARLINET methods. The results reveal for the first time the 9-year 3D seasonal patterns of dust over its transport paths from the Sahara towards the Mediterranean. The dataset is unique with respect to its potential applications, including the evaluation of dust models and the estimation of ice nuclei concentration profiles from space.
We provide a 3D multiyear analysis on the evolution of Saharan dust over Europe, using a dust...
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