Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 5893-5919, 2017
http://www.atmos-chem-phys.net/17/5893/2017/
doi: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
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 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 75 Mm−1 are observed throughout the year at various heights between 2 and 6 km, 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 4 km, reaching mean extinction values up to 50 Mm−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.

Citation: Marinou, E., Amiridis, V., Binietoglou, I., Tsikerdekis, A., Solomos, S., Proestakis, E., Konsta, D., Papagiannopoulos, N., Tsekeri, A., Vlastou, G., Zanis, P., Balis, D., Wandinger, U., and Ansmann, A.: Three-dimensional evolution of Saharan dust transport towards Europe based on a 9-year EARLINET-optimized CALIPSO dataset, Atmos. Chem. Phys., 17, 5893-5919, doi:10.5194/acp-17-5893-2017, 2017.
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Short summary
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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