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김부근,Ryuji Tada,박유현,박장준,Yoshiki Kido,Takuya Itaki,Ken Ikehara 한국지질과학협의회 2009 Geosciences Journal Vol.13 No.2
TL layers (i.e., dark mud layers), either thin or thick, as determined by the L* values with lithologic observation, are distinct paleoceanographic signatures in the East Sea (Sea of Japan), which were formed in response to the global eustatic sea-level fluctuations between interglacials and glacials during the Late Quaternary. These lithologic markers were consistently correlated among the three sediment cores (MD01-2407, 05GCRP21, and KR05-09PC1) collected from the Oki Ridge of the southern Yamato Basin, the South Korea Plateau of the northern Ulleung Basin, and the Matsumae Plateau of the northeastern Japan Basin, respectively. Reconstruction of age models for cores 05GCRP and KR05-09PC1 was aided in a good way by the AMS 14C ages of planktonic foraminifera and identification of the tephra layers, and mainly by lithostratigraphic correlation with TL layers of well-dated core MD01-2407, based on the L* values. The correlation of TL layers among the three sediment cores was remarkable, indicating that the East Sea (Sea of Japan) experienced the synchronous and basin-wide scale paleoceanographic events during the Late Quaternary. Our study exemplifies the significant usefulness of these lithologic markers for further Late Quaternary paleoceanographic investigation.
김부근,윤호일,Cheon Yun Kang,Junlin Zhao 한국해양과학기술원 2004 Ocean and Polar Research Vol.26 No.3
A sediment core drilled from Lake Langer on King George Island was analyzed for a variety of textural and geochemical properties along with 14C age dates. These data were combined with published records of other cores to provide a detailed history of Holocene variation of total organic carbon (TOC) contents with respect to terrestrial paleoclimate change. The lithologic contrast of the lower diamicton and upper fine-grained sediments shows the glacier activity and subsequent lake formation. Low TOC contents fluctuated during the diamicton deposition whereas the increase of TOC began with the lake formation during the postglacial period that started about 5,000 yr B.P. More notable are the distinct TOC peaks that may imply enhanced primary productivity during the warm period. The uniform and low TOC contents may reflect the limited productivity during the evolution of the lake. However, the recent TOC readvance clearly indicates gradual warming on King George Island. However, the paleoclimatic signature in the terrestrial lake environment during the Holocene seems to be subtle and less distinct, compared to the marine environment.
마이크로파 공진자용$Ba_{1-x}A_x(Mg_{1/3}Nb_{2/3})O_3$(A = Sr, Ca)
김부근,김재윤,김강언,정수태,조상희 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.6
The structural changes and the microwave dielectric properties of $Ba_{1-x}$/A$_{x}$/(Mg$_{1}$3//Nb$_{2}$3/)O$_3$(A=Sr, Ca=x0, 0.2, 0.4, 0.6, 0.8, 1.0) were investigated. The densities of samples are gradually decreased with increasing x(BMN=6.1, SMN=5.22 and CMN=4.26 g/m$^3$)The crystal structure of BMN was untilting of oxygen octahedral. The structural changes of BSMN showed the antiphase tilting at x>0.4, and those of BCMN showed the antiphase tilting at 0.2<x<0.8 and antiphase-inphase tilting at x>0.8. The variation of dielectric constant with Sr was small(BMN=32, SMN=30) However the variation with Ca was large the highest value was 42 at Ca=0.2(CMN=25) The maximum quality factor was 68,000 GHz at Sr=0.2 and the minimum quality factor was 3,000 GHz at Ca=0.2 (BMN=35,000, SMN=20,000 and CMN=23,000 GHz) The temperature coefficients of resonant frequency of BSMN were about 2 times larger than those of BCMN in all composition.ion.
남서태평양 리코후 드리프트 퇴적층의 쇄설성 실트입자 크기의 수직적 변화를 이용한 플라이스토세 후기 심해서안경계해류의 세기 변화
김부근,박유현,이영주,박장준 한국해양과학기술원 2006 Ocean and Polar Research Vol.28 No.4
Hole 1124 of ODP Leg 181 was located in the Rekohu sediment drift off eastern New Zealand in the southwest Pacific Ocean. Mean grain sizes of sortable silt were measured in two drilled cores (1124A and 1124B). Chronostratigraphy of core 1124 was correlated with the well-dated nearby core S931, resulting that the age of core 1124 covers the late Pleistocene spanning about MIS (Marine Isotope Stage) 5. Mean grain size of sortable silt seemed to be relatively large during the glacial period, whereas that of the interglacial period was smaller, although several tephra layers contain some coarse-grained pyroclatic particles. The variation in mean grain size of sortable silt in Rekohu sediment drift during the late Pleistocene indicates that the intensity of Deep Western Boundary Current (DWBC) might have been enhanced during the glacial period as a result of increased production of Antarctic Bottom Water (AABW).
김부근,Buhan Song,조현구,Trevor Williams,Carlota Escutia 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.1
On the basis of the variations of sediment properties such as biogenic opal, grain size, natural gamma radiation (NGR), and clay mineralogy, we differentiate two types of late Neogene marine sediments that record paleoclimate changes associated with the growth and retreat of the East Antarctic Ice Sheet (EAIS) and associated changes in sea ice cover. The first type of sediments are massive muds characterized by high biogenic opal (30~55%), low NGR (15~30 counts per second (cps)), large mean grain size (>8.3 μm), and low smectite/(illite + chlorite) [S/(I + C)] ratios (<~0.2). We interpret these sediments as the result from deposition by hemipelagic sedimentation during interglacial conditions. In contrast, the second type of sediments are laminated muds characterized by low biogenic opal (5~7%), high NGR (45~67 cps), small mean grain size (<6.3 μm), and high S/(I + C) ratios (>~0.2). We interpret these sediments as the result from deposition by either turbiditic or contouritic processes during glacial conditions. All these sediment properties indicate that the Wilkes Land continental rise recorded late Neogene paleoclimatic changes in terms of surface water productivity, sediment provenance and transport pathway, and depositional processes that are related to the growth and retreat of EAIS. In addition, the decreased maxima of biogenic opal content at Hole U1359A highlights the temporal climatic change between the late Pliocene (~2.0 Ma to ~3.7 Ma) and the early Pliocene to late Miocene (~3.7 Ma to ~6.3 Ma), confirming the important role of sea ice to the surface water productivity associated with the global cooling trend in the East Antarctica.
김부근,Dongseon Kim,Hyong Chul Shin,Dong Yup Kim 한국지질과학협의회 2007 Geosciences Journal Vol.11 No.3
Sediment-trap deployment in the central Bransfield Strait during 1999/2000 shows distinct seasonal variation of particle fluxes, in which more than 99% of total annual flux occurred during a limited time. A more positive relationship between biogenic silica and total organic carbon fluxes in the intermediate-water sediment trap demonstrates that the surface-water production (mainly diatoms) played an important role in the supply of biogenic particles during the short period. The low 15N values of particulate organic particles are attributed to high nitrate concentration in the Antarctic surface waters. The gradual increasing 15N values in the bottom-water trap from the productive to unproductive season are likely associated with a switch in source from diatom aggregates to some remains of zooplankton, supplement to the horizontal contribution of lithogenic particles presumably from nearby shallow environment. Thus, the 15N enrichment of sinking particles in the bottom-water trap during December to early February seems to be due to the laterally transported materials, assuming that the 15N values decrease with depth in the Antarctic Polar Frontal region
김부근,Robert Dunbar,김동선 한국지질과학협의회 2013 Geosciences Journal Vol.17 No.3
Sediment trap deployments in the eastern Bransfield Basin (west Antarctic) show seasonal and inter-annual variability in particle fluxes, with most of total annual flux at mid-depth occurring during a short period. High seasonality in particle flux may be associated with biological processes (the timing of phytoplankton blooms) and physical factor (sea-ice cover). Inter-annual variability of particle flux may also reflect inter-annual variation of sea-ice cover related to the biological processes. Most notable is that year-round high particle flux is observed in sediment traps moored near the seabed, which is not unexpected, emphasizing the contribution of supplementary transport of lithogenic particles particularly during the unproductive season. In this case, particles in relatively rapid vertical transit, such as aggregates and fecal pellets, are presumably mixed with laterally-transported particles. The relationship between d15N values and biogenic particle flux highlights the contribution of particles in lateral transit to the vertical setting particles downward to the near-bottom sediment trap. Mid-depth sediment trap shows clear seasonal d15N variability, whereas the near-bottom sediment trap shows no distinct seasonal trend, indicating the contamination of low d15N, fresh organic material by high d15N, regenerated and more refractory material resuspended from shallow continental margin. However, judging from the flux-weight d15N values between the mid-depth and near-bottom sediment traps, biogeochemical components contained in the horizontally delivered particles are not critical to prevent the surface-water condition preserved in those of downward sinking particles. Our results provide the convincing implications from the recovery of paleoclimatic information using sediment cores from the eastern Bransfield Basin (west Antarctic).