https://repository.kopri.re.kr/handle/201206/5096 2026-04-21T11:26:06Z https://repository.kopri.re.kr/handle/201206/10514 Title: Application of laser-induced breakdown spectroscopy to Arctic sediments in the Chukchi Sea Authors: Han, Dukki; Joe, Young Jin; Ryu, Jong-Sik; Uno, Tatsuya; Kim, Gibaek; Yamamoto, Masanobu; Park, Kihong; Hur, Hor-Gil; Lee, Ji-Hoon; Nam, Seung-il Abstract: Physical and geochemical investigations coupled with laser-induced breakdown spectroscopy (LIBS) were performed on three surface sediment cores (ARA02B/01A, ARA02B/02, and ARA02B/03A) recovered from the western Arctic Ocean (Chukchi Sea) during the IBRV ARAON 2011 expedition. The LIBS technique was applied to conduct elemental analysis of the Arctic sediments and compare the results to those obtained using an X-ray fluorescence (XRF) core scanner and inductively coupled plasma (ICP) system. The LIBS technique showed an elemental composition similar to that using XRF and ICP in each sediment core. Qualitative and semi-quantitative LIBS analyses provide distinguishable patterns between sediment cores, similar to those observed in the ICP analysis. In particular, the elemental pattern of LIBS responded to the color change of the sediment cores. Dark brown layers in the upper parts of the cores were indicated by the color indices and showed elevated Mn/Al ratios, suggesting the influence of regional variation in terrestrial input since the deglacial period. In this study, grain size distribution and contents of detrital dolomite and organic carbon as well as elemental composition (LIBS) were considered to determine sediment provenance and sedimentation environments during the Holocene. Furthermore, the present study showed that the LIBS technique may be used as an applicable method to unravel regional variations in sedimentary composition in the Arctic Ocean. 2018-08-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6176 Title: Occurrence and distribution of hydroxylated isoprenoid glyceroldialkyl glycerol tetraethers (OH-GDGTs) in the Han Riversystem, South Korea Authors: Kyoung-Hoon Shin; Kang, Sujin; Kim, Junghyun Abstract: We investigated the occurrence and distribution of terrestrial-derived hydroxylated isoprenoid glycerol dialkyl glycerol tetraethers (OH-GDGTs) in the Han River system and their potential impact on the application of the ring index of OH-GDGTs (RI-OH) as a sea surface temperature (SST) proxy in the eastern Yellow Sea. Thereby, we analyzed various samples collected along the Han River and from its surrounding areas (South Korea, n = 34). The OHGDGTs were found in all samples investigated. OH-GDGT-0 was the dominant OH-GDGT component in the estuary and marine samples while OH-GDGT-2 was generally dominant in the soils, the lake sediments and the river suspended particulate matter (SPM). Our results thus suggests a possible warm bias of the RI-OH-derived summer SSTs in the coastal zone to which a large amount of terrestrial organic matter is being supplied. Further studies are necessary to better assess the applicability of the RI-OH proxy in the eastern Yellow Sea. 2017-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/6288 Title: Identification and characterization of fluid escape structures (pockmarks) in the Estremadura Spur, West Iberian Margin Authors: D. Duarte; H. Duarte; Kim, Junghyun; O. Benazzouz; L.M. Pinheiro; P. Madureira; C. Ribeiro; P. Terrinha; V.H. Magalh~a Abstract: The analysis of the seismic profiles allowed the identification of six seismic units, disturbed by the migration and accumulation of fluids. The Estremadura Spur outer shelf has been affected by several episodes of fluid migration and fluid escape during the Pliocene-Quaternary that are expressed by a vast number of seabed and buried pockmarks. At present, the pockmarks are mainly inactive, as the seabed pockmarks are covered by recent sediments. It is concluded that the migration of fluids to the seabed occurred over the Pliocene-Quaternary, as indicated by the buried pockmarks at different depths below the seabed. The vertical stacking of various pockmarks suggests a cyclical fluid flow activity that can possibly be the result of the eustatic sea level variations and the subsequent changes of the hydrostatic pressure. 2017-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/8296 Title: Distributions of n-alkanes in settling particles in the Ulleung basin, the East Sea of Korea Authors: Kim, Solbin; Shin, Kyung-Hoon; Kim, Dawoon; Lee, Dong-Hun; Hwang, Jeomshik; Gal, Jong-Ku; Kim, Junghyun Abstract: 본 연구에서는 동해 울릉분지에서 시계열 침강입자 포집기(time-series sediment trap)를 이용하여 2011년 3월부터 2012년 2월까지 1000m와 2300m 수심에서 약 15-16일 간격으로 채집된 침강입자(Kim et al., 2017) 시료를 활용하여 장족형 탄화수소(n-alkane)를 분석하였다. 분석된 시료에서 짝수보다 홀수의 탄소사슬을 가진 n-alkane이 우세하였으며, 짧은 탄소사슬(C15-C24)보다 긴 탄소사슬(C25-C35)의 n-alkane이 우세한 경향을 나타냈다. 그 중에서도 육상식물(higher land plants) 기원(Eglinton and Hamilton, 1967)의 장족형 홀수 n-alkane(C27, C29, C31)이 두드러지게 높은 분포도를 보였다. 전체 n-alkane(C15-C35) 플럭스 중 육상식물기원 n-alkane(C27+C29+C31)은 평균 51%를 차지하였으며, 전체 n-alkane 플럭스와 육상식물기원 n-alknae 플럭스의 상관관계가 매우 높음을 보였다(R2=0.94). Carbon Preference Index (CPI, C26-C32) 값은 3-11, Natural n-alkanes Ratio (NAR, C19-C32) 값은 0.5-0.8로 n-alkane이 석유기원이 아님을 나타냈다. 두 인덱스 모두 6월과 10월에 높은 값을 가지며 육상식물기원 n-alkane 플럭스와 유사한 경향을 보였다. 또한 육상식물기원의 n-alkane 플럭스가 5월에서 7월 사이에 높은 값을 가질 때, 선행연구(Kim et al., 2017)에서의 탄소안정동위원소 값이 상대적으로 낮게 나타난 것을 확인하였다. 동해로 유입되는 n-alkane의 계절에 따른 변동성을 좀 더 잘 이해하기 위해서 n-alkane의 탄소안정동위원소 분석에 대한 추가 연구가 필요할 것으로 판단된다. 2017-01-01T00:00:00Z