The 2nd edition of the Copernicus Marine Service Ocean State Report (OSR 2) published in 2018 provides information on changes and variations in the ocean over the past decades, with a focus on changes in the marine environment during the year 2016. It is written by nearly 100 scientific experts from more than 30 institutions and draws from the marine monitoring capabilities of the Copernicus Marine Service.
Cover: In Rosati et al. (https://doi.org/10.1002/2017GB005700), Rosati et al. found elevated concentrations of Hg and MeHg in the euxinic waters of the Black Sea.
By integrating observations from the GEOTRACES cruise and 1D biogoechemical modeling along the extended redox gradient of the Black Sea, the work highlights that the bulk of MeHg is produced in situ in anoxic sulfidic waters, and inputs from external sources (i.e. rivers, sediment and the Mediterranean Sea) are negligible.