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Geochemical data for Pacific and Arctic sites superimposed on a map of collection sites. (A–C) Depth variation of interstitial (A) nitrate, (B) ammonium, and (C) total organic carbon at the Pacific sites. Oxygen was below detection at all depths at all three Pacific sites. (D–G) Depth variation of interstitial (D) oxygen, (E) nitrate, (F) ammonium, and (G) total organic carbon at the Arctic sites.
