Widespread anthropogenic nitrogen in the northwestern Pacific Ocean sediment
SCIE
SCOPUS
- Title
- Widespread anthropogenic nitrogen in the northwestern Pacific Ocean sediment
- Authors
- Haryun Kim; LEE, KITACK; Dhong-Il Lim; Seung-Il Nam; Tae-Wook Kim; Jin-Yu T. Yang; Young Ho Ko; Kyung-Hoon Shin; Eunil Lee
- Date Issued
- 2017-05
- Publisher
- AMER CHEMICAL SOC
- Abstract
- Sediment samples from the East China and Yellow seas collected adjacent to continental China were found to have lower delta N-15 values (expressed as delta N-15 = [N-15:N-14(sample)/N-15:N-14(air) - 1] x 1000; the sediment N-15:N-14 ratio relative to the air nitrogen 15N:14N ratio). In contrast, the Arctic sediments from the Chukchi Sea, the sampling region furthest from China, showed higher delta N-15 values (2-3 higher than those representing the East China and the Yellow sea sediments). Across the sites sampled, the levels of sediment delta N-15 increased with increasing distance from China, which is broadly consistent with the decreasing influence of anthropogenic nitrogen (N-ANTH) resulting from fossil fuel combustion and fertilizer use. We concluded that, of several processes, the input of N-ANTH appears to be emerging as a new driver of change in the sediment delta N-15 value in marginal seas adjacent to China. The present results indicate that the effect of N-ANTH has extended beyond the ocean water column into the deep sedimentary environment, presumably via biological assimilation of N-ANTH followed by deposition. Further, the findings indicate that N-ANTH is taking over from the conventional paradigm of nitrate flux from nitrate-rich deep water as the primary driver of biological export production in this region of the Pacific Ocean.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/39116
- DOI
- 10.1021/acs.est.6b05316
- ISSN
- 0013-936X
- Article Type
- Article
- Citation
- ENVIRONMENTAL SCIENCE & TECHNOLOGY, vol. 51, no. 11, page. 6044 - 6052, 2017-05
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