Widespread Anthropogenic Nitrogen in Northwestern Pacific Ocean Sediment
- Authors
- Kim, Haryun; Lee, Kitack; Lim, Dhong-Il; Nam, Seung-Il; Kim, Tae-Wook; Yang, Jin-Yu T.; Ko, Young Ho; Shin, Kyung-Hoon; Lee, Eunil
- Issue Date
- Jun-2017
- Publisher
- American Chemical Society
- Keywords
- SOUTH CHINA SEA; ORGANIC-MATTER SOURCES; SURFACE SEDIMENTS; ARCTIC-OCEAN; YELLOW SEA; ISOTOPIC COMPOSITION; RIVER ESTUARY; CARBON; SHELF; DEPOSITION
- Citation
- Environmental Science & Technology, v.51, no.11, pp.6044 - 6052
- Indexed
- SCIE
SCOPUS
- Journal Title
- Environmental Science & Technology
- Volume
- 51
- Number
- 11
- Start Page
- 6044
- End Page
- 6052
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/9532
- DOI
- 10.1021/acs.est.6b05316
- ISSN
- 0013-936X
- 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.
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