Fig. 1 Environmental conditions and concentrations of floating plastic debris in the Arctic Ocean. Environmental conditions and concentrations of floating.

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Fig. 1 Environmental conditions and concentrations of floating plastic debris in the Arctic Ocean. Environmental conditions and concentrations of floating plastic debris in the Arctic Ocean. (A) At-sea vessel density. (B) Human population and Arctic sea ice extent. Annual minimum and maximum ice extents correspond to the monthly mean of September and March, respectively. Historic data account for the 1981 to 2010 median. (C) Remote-sensed sea surface salinity for August 2013 at the mid-sampling period. The seasonal cycle is shown in fig. S1. psu, practical salinity units. (D) Locations and plastic concentrations of the sites sampled. The summer extension of the polar ice cap in August 2013 is shown in white area, and the classical schematic drawing of the North Atlantic SOG and the THC poleward branch is indicated by green curves (8). The northern passage from Barents Sea to Kara Sea is zoomed in, with contour lines describing salinity measured at a depth of 5 m. (E) Plastic concentrations as total weight (upper graph) and abundances per plastic type (lower graph) along the circumpolar track, from the Greenland Sea to the Labrador Sea, as indicated in the left map by the black line connecting the sampling sites. Salinity at depths of 5 and 20 m is also shown in the upper graph, and two dashed lines are used as reference for 34.5 salinity and the median of plastic concentrations measured in the inner accumulation zones of SOGs [175 g·km−2 (2)]. The correlation between plastic and salinity is shown in fig. S2. Note that the plastic fibers, presented in the lower graph as a dotted line, were excluded from all our analyses, including total plastic concentrations and load estimates in both weight and number. The Arctic Polar Circle (66.34°N) is marked in all maps. Andrés Cózar et al. Sci Adv 2017;3:e1600582 Copyright © 2017, The Authors