Seafloor microplastic hotspots controlled by deep-sea circulation

Although microplastics are known to pervade the global seafloor, the processes that control their dispersal and concentration in the deep sea remain largely unknown. Here, we show that thermohaline-driven currents, which build extensive seafloor sediment accumulations, can control the distribution of microplastics and create hotspots with the highest concentrations reported for any seafloor setting (190 pieces per 50 grams). Previous studies propose that microplastics are transported to the seafloor by vertical settling from surface accumulations; here, we demonstrate that the spatial distribution and ultimate fate of microplastics are strongly controlled by near-bed thermohaline currents (bottom currents).…

• SR
  Sight Research UK

  Awards: NE/R015953/1, NE/S00954X/1, noc010011, bosc01001
• NE
  Natural Environment Research Council

  Awards: NE/S00954X/1, NE/R015953/1, noc010011, bosc01001