Fig. 3 Photographs of MPs detected in snow.

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Fig. 3 Photographs of MPs detected in snow. Photographs of MPs detected in snow. (A) Polystyrene fiber from Svalbard 4 (length, 1101 μm); (B) polypropylene particle from Heligoland (diameter, 256 μm); (C) polyvinyl chloride fiber from Ice Floe 8 (length, 956 μm). Note that these particular two fibers could be analyzed by FTIR as they happened to lay plane on the filter. (D to F) Aluminum oxide filter with enriched snow sample. (G to I) Corresponding polymer-dependent false-color image after FTIR measurement and automated analysis. (D and G) Bavaria 2: The sample with most MPs; (E and H) Ice Floe 9: the sample with the third most MPs; (F and I) Bremen: The sample with intermediate MP numbers but many fibers (photo credit: S. Mützel, Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung). Melanie Bergmann et al. Sci Adv 2019;5:eaax1157 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).