Institut Méditerranéen d’Océanologie
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Campagne d’Intercalibration des Mesures du Mercure dans l’Ocean entre les 11 et 23 juin 2017.

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Le MIO accueillera une vingtaine de Chercheurs Internationaux dans le cadre de la Campagne d’Intercalibration des Mesures du Mercure dans l’Ocean entre les 11 et 23 juin 2017. Cet évenement est organisé par Lars Eric Heimburger, chercheur CNRS de l’équipe CE

We will organize 6 daily cruises to sample seawater, plankton and suspended particles near the Marseilles Bay area. Samples will be brought back to MIO lab facilities with plenty of space to set up equipment of every group, and run the samples within a couple hours after sampling. This allows to involve more labs, and to co-organize a workshop. Only the necessary personnel will embark for sampling, maximum 1 person per group. Why ? The idea of a proper mercury intercalibration cruise emerged from our past intercalibration exercises within GEOTRACES (2008, 2009, 2011, 2013, 2014, 2015), and those before (Cossa et al. 1990). The 2008, 2009, and 2011 exercises were organized by Carl Lamborg and Chad Hammerschmidt. The results of the 2008 and 2009 exercises for total mercury showed large discrepancies among participating labs (Lamborg et al. 2012). The 2011 exercise covered only monomethylmercury, and indicated again a large variability. I organized the 2013, 2014 and 2015 intercalibration exercises. The results indicate that there is a strong need for a Hg intercalibration cruise (Fig.1), mainly because some Hg species, especially gaseous species, cannot preserved over time. Another motivation is of course the GEOTRACES intermediate data product (IDP) for which we need to deomonstrate intercalibration for all Hg species. Hg was not included in the 2014 IDP, because we did not have enough transects yet, but also because our intercalibration efforts were not particularly successful. All international laboratories that regularly produce marine Hg data are invited to participate and intercompare and learn from each other. A common publication guiding future marine Hg studies is planned