Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 14, 1099-1123, 2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
15 May 2014
Support to Aviation Control Service (SACS): an online service for near-real-time satellite monitoring of volcanic plumes
H. Brenot1, N. Theys1, L. Clarisse2, J. van Geffen3, J. van Gent1, M. Van Roozendael1, R. van der A3, D. Hurtmans2, P.-F. Coheur2, C. Clerbaux2,4, P. Valks5, P. Hedelt5, F. Prata6, O. Rasson1, K. Sievers7, and C. Zehner8 1Belgisch Instituut voor Ruimte-Aeronomie – Institut d'Aéronomie Spatiale de Belgique (BIRA-IASB), Brussels, Belgium
2Spectroscopie de l'Atmosphère, Service de Chimie Quantique et Photophysique, Université Libre de Bruxelles (ULB), Brussels, Belgium
3Koninklijk Nederlands Meteorologisch Instituut (KNMI), De Bilt, the Netherlands
4UPMC Univ. Paris 6; Université de Versailles St.-Quentin, CNRS/INSU, LATMOS-IPSL, Paris, France
5Institut für Methodik der Fernerkundung (IMF), Deutsches Zentrum für Luft und Raumfahrt (DLR), Oberpfaffenhofen, Germany
6Norsk Institutt for Luftforskning (NILU), Kjeller, Norway
7Vereinigung Cockpit – German ALPA, Frankfurt, Germany
8European Space Agency (ESA-ESRIN), Frascati, Italy
Abstract. Volcanic eruptions emit plumes of ash and gases into the atmosphere, potentially at very high altitudes. Ash-rich plumes are hazardous for airplanes as ash is very abrasive and easily melts inside their engines. With more than 50 active volcanoes per year and the ever-increasing number of commercial flights, the safety of airplanes is a real concern. Satellite measurements are ideal for monitoring global volcanic activity and, in combination with atmospheric dispersion models, to track and forecast volcanic plumes. Here we present the Support to Aviation Control Service (SACS,, which is a free online service initiated by the European Space Agency (ESA) for the near-real-time (NRT) satellite monitoring of volcanic plumes of SO2 and ash. It combines data from three ultraviolet (UV)-visible and three infrared (IR) spectrometers. The UV-vis sensors are the Ozone Monitoring Instrument (OMI) and the Global Ozone Monitoring Experiment-2 (GOME-2) on-board the two polar orbiting meteorological satellites (MetOp-A & MetOp-B) operated by the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT). The IR sensors are the Atmospheric InfraRed Sounder (AIRS) and the Infrared Atmospheric Sounding Interferometer (IASI) on-board MetOp-A & MetOp-B. This new multi-sensor warning system of volcanic emissions is based on the selective detection of SO2 and ash. This system is optimised to avoid false alerts while at the same time limiting the number of notifications in case of large plumes. A successful rate with more than 95% of notifications corresponding to true volcanic activity is obtained by the SACS system.

Citation: Brenot, H., Theys, N., Clarisse, L., van Geffen, J., van Gent, J., Van Roozendael, M., van der A, R., Hurtmans, D., Coheur, P.-F., Clerbaux, C., Valks, P., Hedelt, P., Prata, F., Rasson, O., Sievers, K., and Zehner, C.: Support to Aviation Control Service (SACS): an online service for near-real-time satellite monitoring of volcanic plumes, Nat. Hazards Earth Syst. Sci., 14, 1099-1123,, 2014.
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