한반도 주변 연안지역 퇴적물에 대한 탄소, 질소 동위원소와 알칸 연구: 연구방향에 대한 예시

Abstract

Surface sediment from the shelf and coastal areas of the Korean peninsula were investigated to determine carbon and nitrogen isotopic values, and assess the source of organic matter. Significant spatial differences in total organic carbon (TOC) and carbon and nitrogen isotope (δ13C, δ15N) values were documented in sediment from the southern coastal areas. The TOC (%) varied from 0.22% to 3.42% (average = 1.41, n = 81), and the C/N ratio varied from 2.4 to 15.2 (average = 8.65, n = 81). The δ13C values ranged from -19.92‰ to -25.86‰ (average = -21.18‰, n = 91), and δ15N values ranged from 3.93‰ to 9.80‰ (average = 6.39‰, n = 91). The TOC (%) in all three areas was associated with grain-size variation (higher TOC in finer grained sediment). High TOC (%) in Masan Bay sediment correlated with relatively higher C/N. δ13C and δ15N also showed a wide range of variation, suggesting the combined influences of terrestrial organic matter and diagenetic alteration. These results indicate that δ13C and δ15N of sedimentary organic matter in continental shelf and bay environments may be useful in tracking both the source of sedimentary organic matter and related changes in local oceanographic environments. In addition to enabling the distribution and source of terrestrial organic matter to be identified, the n-alkanes indicated that minor anthropogenic allochthonous organic materials were superimposed on the total orgTOC) and carbon and nitrogen isotope (δ13C, δ15N) values were documented in sediment from the southern coastal areas. The TOC (%) varied from 0.22% to 3.42% (average = 1.41, n = 81), and the C/N ratio varied from 2.4 to 15.2 (average = 8.65, n = 81). The δ13C values ranged from -19.92‰ to -25.86‰ (average = -21.18‰, n = 91), and δ15N values ranged from 3.93‰ to 9.80‰ (average = 6.39‰, n = 91). The TOC (%) in all three areas was associated with grain-size variation (higher TOC in finer grained sediment). High TOC (%) in Masan Bay sediment correlated with relatively higher C/N. δ13C and δ15N also showed a wide range of variation, suggesting the combined influences of terrestrial organic matter and diagenetic alteration. These results indicate that δ13C and δ15N of sedimentary organic matter in continental shelf and bay environments may be useful in tracking both the source of sedimentary organic matter and related changes in local oceanographic environments. In addition to enabling the distribution and source of terrestrial organic matter to be identified, the n-alkanes indicated that minor anthropogenic allochthonous organic materials were superimposed on the total org