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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-341
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-341
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 30 Sep 2019

Submitted as: research article | 30 Sep 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Sulphur mass balance and radiative forcing estimation for a moderate volcanic eruption using new sulphate aerosols retrievals based on IASI observations

Henda Guermazi1,2,3, Pasquale Sellitto1, Juan Cuesta1, Maxim Eremenko1, Mathieu Lachatre2, Sylvain Mailler2, Elisa Carboni4,5, Giuseppe Salerno6, Tommaso Caltabiano6, Laurent Menut2, Mohamed Moncef Serbaji3, Farhat Rekhiss3, and Bernard Legras2 Henda Guermazi et al.
  • 1Laboratoire Inter-universitaire des Systèmes Atmosphériques, UMR CNRS 7583, Université Paris-Est-Créteil, Université de Paris, Institut Pierre Simon Laplace, Créteil, France
  • 2Laboratoire de Météorologie Dynamique, UMR CNRS 8539, École Normale Supérieure, PSL research University, École Polytechnique, Sorbonne Universités, École des Ponts PARISTECH, Institut Pierre Simon Laplace, Paris, France
  • 3National School of Engineers of Sfax, Water, Energy and Environment Laboratory L3E, University of Sfax, Tunisia
  • 4COMET, Atmospheric, Oceanic and Planetary Physics, University of Oxford, Clarendon Laboratory, Oxford, United Kingdom
  • 5UK Research and Innovation, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Chilton, United Kingdom
  • 6Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo, Catania, Italy

Abstract. We developed a new retrieval algorithm based on the Infrared Atmospheric Sounding Interferometer (IASI) observations, called AEROIASI-Sulphates, to measure vertically-resolved sulphate aerosols (SA) extinction and mass concentration profiles, with limited theoretical uncertainties (typically ~25 % total uncertainty for SA mass column estimations). The algorithm, based on a self-adapting Tikhonov-Phillips regularization method, is applied to a medium-sized-intensity eruption of Mount Etna volcano (18 March 2012). Comparisons with simultaneous and independent SO2 plume observations and simulations show that AEROIASI-Sulphates correctly identifies the volcanic plume morphology both horizontally and vertically. This method provided, for the first time, crucial information pieces to describe the gaseous-to-particulate volcanic sulphur mass balance (60 % of the injected sulphur mass is converted to particulate matter, after ~24 hours) and to estimate the regional shortwave direct radiative forcing (a regional forcing of −0.8 W/m2 is exerted in the eastern Mediterranean) for moderate volcanic eruptions.

Henda Guermazi et al.
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