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Application of the newly developed nutrient diol index (NDI) as a sea surface nutrient proxy in the East Sea for the last 240 years

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Title
Application of the newly developed nutrient diol index (NDI) as a sea surface nutrient proxy in the East Sea for the last 240 years
Other Titles
동해에에서 과거 240년간의 기록을 통한 해양표층 영양염 프록시로서 nutrient diol index (NDI) 적용 연구
Authors
Gal, Jong-Ku
Kim, Junghyun
Kim, Solbin
Lee, Sang Han
Yoo, Kyu-Cheul
Shin, Kyung-Hoon
Subject
Physical Geography; Geology
Keywords
Long chain diols; Nutrient diol index; Surface nutrient proxy; Long chain diol index; Alkenone unsaturation index
Issue Date
2019-02
Citation
Gal, Jong-Ku, et al. 2019. "Application of the newly developed nutrient diol index (NDI) as a sea surface nutrient proxy in the East Sea for the last 240 years". QUATERNARY INTERNATIONAL, 503(1): 146-152.
Abstract
We assessed the applicability of the nutrient diol index (NDI) as a proxy for sea surface nutrients by analyzing sediments from a box core (ES14-BC03) collected in the southwestern continental slope of the East Sea, or the Japan Sea (hereafter the East Sea). The estimated sedimentation rate based on the Pb-210 chronology was 0.15 cm yr(-1) over the last 240 yrs. The NDI-derived phosphate (0.69 mu mol L-1) and nitrate (8.63 mu mol L-1) concentrations for the core-top sediment were within the average phosphate (0.26 +/- 0.08 mu mol L-1) and nitrate (3.38 +/- 2.32 mu mol L-1) concentration ranges for the last similar to 20 years, accounting for both estimation error and variation in observational data. The distributions of the NDI-diols varied slightly through time, grouping into two distinct clusters (Cluster 1 and Cluster 2) in both principle component analysis (PCA) and hierarchical clustering of principal components (HCPC). Cluster 2 represented a time period with higher relative abundances of the C-28 and C-30 1,14-diols, resulting in higher NDI-derived nutrient concentrations than those of other periods. Interestingly, during this period, the U-37(K')-derived sea surface temperatures (SSTs) also decreased. These results indicate that higher surface nutrient conditions and colder SSTs occurred between 1884 CE and 1911 CE, which might be associated with stronger upwelling intensity at the study site. This study is the first application of the NDI to a down-core, demonstrating that the NDI can be a useful proxy that provides helpful information about past sea surface nutrient conditions.
URI
https://repository.kopri.re.kr/handle/201206/10888
DOI
http://dx.doi.org/10.1016/j.quaint.2018.11.003
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