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East Asia Winter Monsoon changes inferred from environmentally sensitive grain-size component records during the last 2300 years in mud area southwest off Cheju Island,ECS

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Science China Earth Sciences 2006年第6期49卷 604-614页

作者： yoshiki saito Geological Survey of Japan Tsukuba Ibaraki 305-8567 Japan

Environmentally sensitive grain-size component (ESGSC) extracted from grain-size data of a sediment core B2, which were retrieved from mud area southwest off Cheju Island (MACI), East China Sea (ECS), can be used to indicate the variations of East Asia Winter Monsoon (EAWM), with high (low) content/mean-size of ESGCS denote to strong (weak) EAWM. Combined with AMS14C datings core B2 provides a continuous high-resolution record of EAWM changes over the past 2300 years, with an average resolution of 13 years. The results show that the variations of EAWM are con-sistent with temperature changes inferred from historical documents in eastern China over the past 2300 years, from which four climate stages may be identified. In stages before 1900 aBP (50 AD) and 1450―780 aBP (50―1170 AD) the EAWM were comparatively weak, corresponding to warm climate periods in eastern China, respectively. And in stages of 1900―1450 aBP (50―500 AD) and 780―219 aBP (1170―1731 AD) the EAWM were strongly developed, which correspond well to climate changes of two cold periods in eastern China. It is also shown from this study that the stage at 780―219 aBP (1170―1731 AD) was the coldest climate period during the last 2300 years and could be, therefore, related to the Little Ice Age (LIA). Climatic fluctuations appeared obviously in all the four stages, and two climate events of abrupt changes from warm to cold occurred at around 1900 aBP (50 AD) and 780 aBP (1170 AD), of which the latter is probably related to globe-scale changes of atmospheric circulation at that time.

关键词： East China Sea, mud area, environmentally sensitive grain-size component, East Asia Winter Monsoon, Little Ice Age, Late Holocene.

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Geochemical and Grain-Sized Implications for Provenance Variations of the Central Yellow Sea Muddy Area Since the Middle Holocene

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Journal of Ocean University of China 2020年第3期19卷 577-588页

作者： AI Lina HAN Zongzhu WU Xiao saito yoshiki WANG Houjie College of Marine Geosciences/Key Laboratory of Submarine Geosciences and Prospecting Techniques MOEOcean University of ChinaQingdao 266100China Laboratory of Marine Geology Qingdao National Laboratory of Marine Science and TechnologyQingdao 266237China Estuary Research Center Shimane UniversityMatsue 690-8504Japan Geological Survey of Japan AISTTsukuba 305-8567Japan

Based on high-resolution analysis to a 280-cm long sediment core obtained from the muddy area in the central Yellow Sea, we examined the provenance of muddy sediments and discussed the changing marine sedimentary environment since the middle Holocene. The results indicated that fine-grained sediments in the muddy area were mainly derived from the Huanghe(Yellow River) and Changjiang(Yangtze River) with considerable stepwise variations during the past 6.6 kyr. The Yellow Sea Warm Current was initiated at 6 kyr when the sea level was high together with the enhanced East Asian Winter Monsoon. These in combination established the framework of shelf circulation in the Yellow Sea that began to trap the river-derived fine-grained sediments. From 4.9 kyr to 2.8 kyr, both the Kushiro Current and East Asian Monsoon were significantly weakened, reducing the delivery of Changjiang sediments to the muddy area. As a result, the sediments were mainly originated from the Huanghe. From 2.8 kyr to 1.5 kyr the continuously weakened East Asian Winter Monsoon and enhanced Yellow Sea Warm Current entrapped more fine-grain sediments. Whereas the enhanced East Asian Winter Monsoon and the human caused increase in sediment load of the Huanghe since 1.5 kyr, and direct delivery of Huanghe sediments to the Yellow Sea during 1128–1855 AD might dominated the sedimentation in the study area. The stepwise variations of the sediment provenance and composition of the Central Yellow Sea muddy sediments are of importance to understanding the formation of muddy deposit in the central Yellow Sea and the associated variations of marine environment since the middle Holocene.

关键词： sediment provenance rare earth elements grain size central Yellow Sea mud middle Holocene

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Rock magnetic property of gravity core CSH1 from the northern Okinawa Trough and the effect of early diagenesis

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Acta Oceanologica Sinica 2007年第5期26卷 54-65页

作者： GE Shulan SHI Xuefa WU Yonghua LEE Tehquei XIONG Yingqian saito yoshiki Marine Sedimentation and Environmental Geology Key Laboratory of State Oceanic Administration First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China Institute of Earth Sciences Taipei China Geology Survey of Japan Tsukuba 306 - 8567 Japan

Detailed rock magnetic investigations were undertaken at 2 -4 cm interval for the gravity core CSHI （with a length of 17.36 m） from the northern Okinawa Trough. Time-scale of the core was constructed by two characteristic tephras and foraminferal assemblages, indicating an age of 50 ka for the bottom of the core. Except for three tephras and abrupt decrease in surface, there are little changes in all kinds of rock magnetic parameters that can be correlated to the climate change for the last 50 ka. Different from the common sediments, most S-ratios （S equals the negative ratio of IRM-0.3T to SIRM, which is an indicator of low coercivity content） of the sediments are smaller than 0. 9, which implies a substantial amount of magnetic minerals with high coercivity. The existence of iron sulphide （ greigite or pyrrhotite） is revealed by representative susceptibility - temperature curves showing 200 350 ℃ Curie temperature in addition to 580 ℃ of magnetite, and also by awful smell during heating and dark heating products. Both the occurrence of authigenic iron sulphide and quick decrease of magnetic parameters near the surface clearly show that sediments from Core CSHI have undergone early diagenesis. The featureless magnetic changes of the whole core except for three tephras mean that the post-depositonal alteration is so strong that most original signals have been destroyed. For the same reason, the organic matter in sediment and sulphate in pore water must have been consumed along with dissolution, precipitation of iron and manganese happening sequencially during the redox reaction series. Great caution must be taken when using these altered chemical parameters for the interpretation of climatic changes.

关键词： northern Okinawa Trough gravity core of CSHI rock magnetic property characteristic tephra early diagenesis

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Sedimentary Evolution of the Holocene Subaqueous Clinoform off the Southern Shandong Peninsula in the Western South Yellow Sea

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Journal of Ocean University of China 2014年第5期13卷 747-760页

作者： QIU Jiandong LIU Jian saito yoshiki YANG Zigeng YUE Baojing WANG Hong KONG Xianghuai College of Marine Geo-Science Ocean University of China The Key Laboratory of Marine Hydrocarbon Resources and Environment Geology Ministry of Land and Resources Qingdao Institute of Marine Geology Ministry of Land and Resources Geological Survey of Japan AIST

Based on the stratigraphic sequence formed since the last glaciation and revealed by 3000 km long high-resolution shallow seismic profiles and the core QDZ03 acquired recently off the southern Shandong Peninsula, we addressed the sedimentary characteristics of a Holocene subaqueous clinoform in this paper. Integrated analyses were made on the core QDZ03, including sedimentary facies, sediment grain sizes, clay minerals, geochemistry, micro paleontology, and AMS 14 C dating. The result indicates that there exists a Holocene subaqueous clinoform, whose bottom boundary generally lies at 15–40 m below the present sea level with its depth contours roughly parallel to the coast and getting deeper seawards. The maximum thickness of the clinoform is up to 22.5 m on the coast side, and the thickness contours generally spread in a banded way along the coastline and becomes thinner towards the sea. At the mouths of some bays along the coast, the clinoform stretches in the shape of a fan and its thickness is evidently larger than that of the surrounding sediments. This clinoform came into being in the early Holocene(about 11.2 cal kyr BP) and can be divided into the lower and upper depositional units(DU 2 and DU 1, respectively). The unit DU 2, being usually less than 3 m in thickness and formed under a low sedimentation rate, is located between the bottom boundary and the Holocene maximum flooding surface(MFS), and represents the sediment of a post-glacial transgressive systems tract; whereas the unit DU 1, the main body of the clinoform, sits on the MFS, belonging to the sediment of a highstand systems tract from middle Holocene(about 7–6 cal kyr BP) to the present. The provenance of the clinoform differs from that of the typical sediments of the Yellow River and can be considered as the results of the joint contribution from both the Yellow River and the proximal coastal sediments of the Shandong Peninsula, as evidenced by the sediment geochemistry of the core. As is control

关键词：水下三角洲中全新世山东半岛南黄海沉积演化海平面变化最大厚度西部

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现代黄河水系在中更新世气候转型早期形成?

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Science Bulletin 2022年第15期67卷 1603-1610,M0004页

作者：王鑫胡钢 yoshiki saito 倪观忠胡涵余子莹陈京平王蜜袁小平王磊胡振波聂军胜潘保田 Key Laboratory of Western China’s Environmental Systems(Ministry of Education) College of Earth and Environmental SciencesInstitute of Green Development for the Yellow River Drainage BasinLanzhou UniversityLanzhou 730000China State Key Laboratory of Earthquake Dynamics Institute of GeologyChina Earthquake AdministrationBeijing 100029China Estuary Research Center Shimane UniversityShimane 6908504Japan Geological Survey of Japan National Institute of Advanced Industrial Science and TechnologyTsukuba 3058567Japan School of Earth Sciences China University of GeosciencesWuhan 430074China The First Monitoring and Application Center China Earthquake AdministrationTianjin 300180China

黄河贯通三门峡东流入海是现代黄河水系格局形成的重要标志,但对其形成时代尚存晚中新世-早上新世到晚更新世的不同认识.三门峡是黄河的最后一个峡谷,该地区的沉积记录能为约束现代黄河水系的形成时代提供最直接的地质证据.本文对三门... 详细信息

黄河贯通三门峡东流入海是现代黄河水系格局形成的重要标志,但对其形成时代尚存晚中新世-早上新世到晚更新世的不同认识.三门峡是黄河的最后一个峡谷,该地区的沉积记录能为约束现代黄河水系的形成时代提供最直接的地质证据.本文对三门峡盆地中部的钻孔岩芯开展了系统的年代学、沉积学和物源分析.研究结果表明:1.96~1.25 Ma,三门峡盆地以封闭性咸水/微咸水湖沉积为主,沉积物主要来源于盆地周边的中条山、秦岭等近源山体,无上游鄂尔多斯地块的碎屑物质输入;自约1.25 Ma起,典型的河流沉积物开始大规模发育,鄂尔多斯地块的碎屑物质大量涌入,表明黄河中游水系开始连通,现代黄河水系形成.黄河贯通三门峡的时代与中更新世气候转型期全球海平面的加速降低有较好的一致性,暗示全球海平面变化对现代黄河水系的形成演化有重要影响,其贡献可能与中上游地区的构造运动同等重要.

关键词：碎屑物质全球海平面鄂尔多斯地块盆地周边黄河水系钻孔岩芯物源分析地质证据

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Eliminating residual iPS cells for safety in clinical application

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Protein & Cell 2015年第7期6卷 469-471页

作者： Shigeo Masuda Shigeru Miyagawa Satsuki Fukushima Nagako Sougawa Kaori Okimoto Chika Tada Atsuhiro saito yoshiki Sawa Department of Cardiovascular Surgery Osaka University Graduate School of Medicine Osaka 565-0871 Japan

First-in-human clinical trial for age-related macular degen- eration using iPSC-derived retinal pigment epithelium （RPE） cells was conducted in 2014, showing no serious adverse effects to date, including tumor formation. This appears to be attributable to relatively small number of transplanted cells, and distinct morphology of RPE cells; it might be relatively easy to minimize contamination of undifferentiated cells. However,

关键词： Retinal Pigment Epithelium Teratoma Macular Degeneration Retinal Pigment Epithelium Cell Undifferentiated Cell

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南黄海中部泥质区7200年以来东亚冬季风变化的沉积记录

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中国科学：地球科学 2012年第10期42卷 1568-1581页

作者：胡邦琦杨作升赵美训 yoshiki saito 范德江王利波国土资源部海洋油气资源与环境地质重点实验室青岛海洋地质研究所青岛266071 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室西安710075 中国海洋大学海洋地球科学学院青岛266100 中国海洋大学海洋化学理论与工程技术教育部重点实验室青岛266100 Geological Survey of Japan National Institute of Advanced Industrial Science and Technology(AIST)TsukubaIbaraki305-8567Japan

对南黄海中部泥质区的三个柱样(ZY-1,ZY-2和ZY-3孔)进行了AMS14C测年、沉积层序以及沉积物敏感粒级的分析.结果表明此三孔的岩性上下均一且沉积连续,均为黏土质粉沙,是全新世高海平面以来的沉积产物.ZY-1,ZY-2和ZY-3孔的粒度垂向变化特... 详细信息

对南黄海中部泥质区的三个柱样(ZY-1,ZY-2和ZY-3孔)进行了AMS14C测年、沉积层序以及沉积物敏感粒级的分析.结果表明此三孔的岩性上下均一且沉积连续,均为黏土质粉沙,是全新世高海平面以来的沉积产物.ZY-1,ZY-2和ZY-3孔的粒度垂向变化特征基本一致,主要受控于现代黄海环流体系中冬季风驱动的黄海近岸海流的强弱,间接反映了东亚冬季风强弱变化.利用ZY-1,ZY-2和ZY-3孔的沉积物敏感粒级获得了近7200年来高分辨率的东亚冬季风替代指标,发现在7.2～4.2ka期间东亚冬季风强盛且波动大,4.2～1.8ka期间东亚冬季风表现为中等强度且比较稳定,东亚冬季风强度在1.8～0ka期间虽较弱,但在此阶段后期略有上升.中全新世以来,南黄海中部泥质区所记录的东亚冬季风变化趋势在千年尺度上与已报道的东亚夏季风强度变化趋势基本一致,主要受控于轨道驱动的太阳辐射量冬、夏季季节性变化差异;但在百年尺度上东亚冬季风增强事件则与夏季风减弱事件相对应,呈现反向变化,可能是对太阳活动减弱的敏感响应.

关键词：东亚冬季风南黄海中部泥质区敏感粒级太阳活动中全新世

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Rice domestication and climatic change:phytolith evidence from East China

Rice domestication and climatic change:phytolith evidence fr...

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中国科学院地质与地球物理研究所2002学术年会

作者： Serge Berne yoshiki saito Serge Berne French Oceanographic InstituteIFREMERBP 70FR-29280 PlouzaneFrance yoshiki saito MREGeological Survey of JapanAISTCentral 7Higashi 1-1-1TsukubaIbaraki305-8567Japan

Fossil rice phytoliths have been *** from a lateglacial to Holocene sequence of epicontinental sediments in the East China Sea that were probably transported by the Yangtze River from its middle and/or lower *** rice phytoliths *** in the sequence at about 13 900 *** BP and disappeared during the period of 13 000-10 000 *** BP,implying the earliest domesticated cereal crops of the world ever *** on the records of phytoliths,pollen, diatoms and foraminifera from the sequence,the climate between 13000 and 10 000 *** BP was notably colder(Younger Dryas).The coincidence of disappearance of domesticated rice phytoliths with cold climate conditions may suggest a great climatic influence on human activities during that *** and wetter conditions during the period 13900 to 13000 *** BP and after 10 000 cal. yr BP have probably favoured rice domestication in the area.

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越南红河三角洲地区孢粉学记录及气候信息解译

越南红河三角洲地区孢粉学记录及气候信息解译

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中国古生物学会孢粉学分会七届二次学术年会

作者：李珍 yoshiki saito LeQuoc Doanh 华东师范大学河口海岸学国家重点实验室 IGG Geological Survey of Japan AISTCentral 7Higashi 1-1-1Tsukuba 305-8567Japan Vietnam Agricultural Science Institute Thanh TriHanoiVietnam

全新世气候交化与人类活动密切相关,了解该期短尺度气候变化及影响因素,有利于认识人类生存环境,预测末来变化,为制定可持续发展战略提供基础理论依据。河流三角洲具有丰富的沉积物源,沉积速率高,适合进行高分辨率的气候环境变化的研究... 详细信息

全新世气候交化与人类活动密切相关,了解该期短尺度气候变化及影响因素,有利于认识人类生存环境,预测末来变化,为制定可持续发展战略提供基础理论依据。河流三角洲具有丰富的沉积物源,沉积速率高,适合进行高分辨率的气候环境变化的研究．但三角洲海岸沉积区往往发生多次海相、陆相等沉积环境的变迁,导致即使在气候状况相同的情况下,沉积物中的孢粉组合也会表现出很大的变化,对利用孢粉分析的手段来进行气候变化研究产生

关键词：孢粉学古气候红河三角洲

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Natural Convection Melting in a Rectangular Heat Storage Tank of Carbon Nanotube Dispersed Latent Heat Storage Material

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Journal of Thermal Science 2024年第3期33卷 847-855页

作者： Shin-ichi MORITA Tomoya saito Kazunori TAKAI Yasutaka HAYAMIZU Naoto HARUKI Division of Mechanical and Electrical Engineering Kitami Institute of Technology165 Koen-choKitami-shiHokkaido090-8507Japan National Institute of Technology Yonago College4448 Hikona-cyoYonago-shiTottori683-8502Japan Okayama Prefectural University 111 KubokiSoja-shiOkayama719-1197Japan

A dispersion system fluid can convect even if the dispersoid is a solid ***,heat exchange performance can be improved while maintaining fluidity using a material with high thermal conductivity as the *** study presents the melting performance evaluation results of a latent heat storage material with a carbon nanotube(CNT)dispersion system with high thermal conductivity,which enhances the thermal conductivity of the latent heat storage material and does not limit free *** the thermal conductivity and enhancing the melting convection of the heat storage material result in increased latent heat storage *** this study,the thermal conductivity of the latent heat storage material was successfully increased by dispersing CNTs in the *** 0.1%(in mass)of multi-wall CNT(MWCNT)was dispersed in a paraffin-based latent heat storage material,the shear stress increased by 1.5 times at a shear rate of 500 s^(-1),while taking into account the potential effects of convective ***,a latent heat storage experiment was conducted in a rectangular heat storage tank using the CNT dispersion composition ratio as a parameter.A rectangular vessel with a heated vertical surface was used for the latent heat storage *** melting speed was determined by comparing the amount of latent heat stored in a CNT-dispersed latent heat storage material and a single-phase latent heat storage material *** experimental results show that the time required for the latent heat storage material to completely melt in the heat storage tank was the shortest for the single-phase latent heat storage material ***,the fastest melting progress was observed for the sample with 0.02%(in mass)MWCNT content in the melting rate range of up to approximately 40%in the *** results indicate that this phenomenon is caused by the difference in the melting rates in the upper part of the *** generated data are useful for det

关键词： latent heat storage phase change carbon nano tube free convection heat transfer

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