An illustration showing atmospheric nitrate transportation (IMAGE)
Caption
Since the 1990s, although nitrate emissions have decreased greatly (graph, orange line), the Greenland SE-Dome ice core shows that particulate nitrates have persisted (graph, black line). This is due to a buffering effect where gaseous nitrates are converted to particulate nitrates even though emissions have decreased; these particulate nitrates were transported to the Arctic and recorded in the Arctic ice. (Illustration: Sakiko Ishino)
Credit
Illustration: Sakiko Ishino
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