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Widespread Anthropogenic Nitrogen in Northwestern Pacific Ocean Sediment

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Title
Widespread Anthropogenic Nitrogen in Northwestern Pacific Ocean Sediment
Other Titles
북서태평양 퇴적물에 분포하는 광범위한 인류기원 질소
Authors
Kim, Haryun
Lee, Eunil
Shin, Kyung-Hoon
Ko, Young Ho
J.-Y. T. Yang
Kim, Tae-Wook
Lee, Mi Jung
Lim, Dhong-il
Lee, Kitack
Subject
Engineering; Environmental Sciences & Ecology
Keywords
Antropogenic Nitrogen; Arctic sediments; Nitrogen isotopes
Issue Date
2017
Citation
Kim, Haryun, et al. 2017. "Widespread Anthropogenic Nitrogen in Northwestern Pacific Ocean Sediment". ENVIRONMENTAL SCIENCE & TECHNOLOGY, 51(0): 6044-6052.
Abstract
Sediment samples from the East China and Yellow seas collected adjacent to continental China were found to have lower δ15N values (expressed as δ15N = [15N:14Nsample/15N:14Nair ? 1] × 1000‰;the sediment 15N:14N 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 δ15N values (2?3‰higher than those representing the East China and the Yellow sea sediments). Across the sites sampled, the levels of sediment δ15N increased with increasing distance from China, which is broadly consistent with the decreasing influence of anthropogenic nitrogen (NANTH) resulting from fossil fuel combustion and fertilizer use. We concluded that, of several processes, the input of NANTH appears to be emerging as a new driver of change in the sediment δ15N value in marginal seas adjacent to China. The present results indicate that the effect of NANTH has extended beyond the ocean water column into the deep sedimentary environment, presumably via biological assimilation of NANTH followed by deposition. Further, the findings indicate that NANTH 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
http://repository.kopri.re.kr/handle/201206/6333
DOI
http://dx.doi.org/10.1021/acs.est.6b05316
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