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Distribution characteristics of magnetic susceptibility of the surface sediments in the southern Yellow Sea

Chinese Science Bulletin 2003年第B06期48卷 37-41页

作者： ge shulan~(1,2.3), shi {2.~1 & han yibing~1 1. key laboratory of marine sedimentology and environmental geology, first institute of oceanography,{12. 2. institute of geology and geophysics, Chinese Academy of Sciences, Beijing 10002.. china 3. Graduate School. Chinese Academy of Sciences, Beijing 100039. china 1. key {1. of marine sedimentology and environmental geology First Institute of Oceanography State Oceanic Administration 266061 Qingdao China 2. institute of {1.ology and {1.ophysics Chinese Academy of Sciences 100029 Beijing China 3. Graduate School Chinese Academy of Sciences 100039 Beijing China

The characteristic distributions of magnetic susceptibility (MS) are analyzed on the basis of susceptibility of 1.2.surface sediment samples in the southern Yellow Sea (SYS). The preliminary results are as follows: first, the distributions clearly correspond to different modern sediment assembla{1.s in the continental sea, which indicates different sediment origins. With the 30 μCGS isoline being taken as demarcation line, the study area can then be divided into section H (high MS value area) and section L (low MS value area). Section H is mainly adjacent to land with two main sources of the Changjiang River and the Huanghe *** L is mainly an eddy sediment area, where Yellow Sea Cold Water is entrenched all the year round. The distribution pattern of MS could tell apart strong or weak hydrodynamic conditions and has a close relation to the circulation system in this area. At the areas of the SYS Circumfluent and northern East china Sea (NECS) Circumfluent (weak hydrodynamic), the MS has low values, while in the areas of Coastal Current (strong hydrodynamic), the values are *** the same time, the oxidizing areas tend to take on higher MS, while the reducing areas have lower one. It seems safe to say that the MS in the continental sea reflects more of the sediment origin and sedimentary environment, which is different from that of loess, lake and surface soil as a climate proxy.

关键词：中国黄海表面沉积物磁化率等值线长江黄河旋涡沉积区循环系统

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Organic carbon and nitrogen isotopes in surface sediments from the western Arctic Ocean and their implications for sedimentary environments

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Acta Oceanologica Sinica 2006年第5期25卷 39-54页

作者： CHEN Zhihua shi {1. CAI Deling {2. yibing YANG Zuosheng Ocean University of china Qingdao 266003 China first {1. of {2. State Oceanic Administration Qingdao 266061 China key {1. of {2. sedimentology ＆ environmental geology of state oceanic administration First Institute of Oceano-graph State Oceanic AdministrationQingdao 266061 China

Surface sediments from the Chukchi Sea and adjacent arctic deep sea were investigated for organic carbon and nitrogen isotopes （in δ1.Corg and δ1.Norg） as well as biogeni＇c silica （BSiO2.. δ1.Corg and δ1.Norg values of surface sediments in the study area fall between the end-member values of marine and terrestrial organic matter from the surrounding lands and seas, their variations reflect the changes of marine productivity and terrestrial supply in the study area. BSiO2.shows a similar distribution pattern with δ1.Corg and δ1.Norg, and can be used as an indicator of marine productivity. In the central-west Chukchi Sea and the Chukchi Rise, sediments have higher δ1.Corg, δ1.Norg and BSiO2.values, indicating the region has high marine productivity influenced by the nutrient-rich branches of the Pacific waters. In the coastal zone off northwestern Alaska, δ1.Corg and δ1.Norg values become lighter, indicating a weakening marine productivity and an increasing terrigenous supply due to the effects of the least nutrient-rich branch of the Pacific waters. In the north and the northeast of the study area （including the Chukchi Plateau, the Canada Basin and the Beaufort shelf）, δ1.Corg, δ1.Norg and BSiO2.have the lowest values, and the terrigenous organic matter becomes dominant in surface sediments because this region has the longest ice-covered duration, the least nutrient-rich seawater and the increasing supply of terrestrial materials from the Mackenzie River and the northern Alaska under the action of the clockwise Beaufort gyre. Because the subarctic Pacific waters are continuously discharged into the central basin of the Arctic Ocean through the study area, the nutrient pool in the Chukchi Sea can be considered as a typical open system, the ratio of δ1.Norg to BSiO2.content show some tracers that the level of nutrient utilization is contrary to nutrient supply and marine productivity formed in seawater.

关键词： western Arctic Ocean surface sediments organic carbon and nitrogen isotopes biogenic silica

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Benthic foraminiferal δ^(1.)C minimum events in the southeastern Okhotsk Sea over the last 1.0 ka

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Chinese Science Bulletin 2014年第15期59卷 3066-3074页

作者： Yonghua Wu xuefa {1. Jianjun Zou Zhenbo Cheng Kuns{2. Wang shulan ge Fengdeng {1. state {1. {2. of marine geology Tongji University key {1. of {2. sedimentology and environmental geology First Institute of Oceanography State Oceanic Administration

A total of six d1.C minimum events,i.e.,VI,V,IV,III,II,and I,were observed via a stable carbon and oxygen isotope analysis of infaunal benthic foraminifera Uvigerina *** gravity core OS03-1.in the southeastern Okhotsk Sea over the last 1.0 *** events occurred at1.2.1.9,1.2.90,85–76,57–54,44–40,and 1.–1. ka *** largest negative excursions reached 2.5%in event V and were greater than 1.in the other *** proposed that all d1.C minimum events were caused by the increase in sea surface water productivity,the weakened formation of Okhotsk Sea intermediate water,and the enhancement of the oxygen minimum *** negative excursions were unaffected by methane hydrate destabilization and subsequent methane release based on the results obtained by using archaeal lipid markers.

关键词：鄂霍次克海底栖有孔虫东南部事件氧同位素分析甲烷水合物甲烷释放分解释放

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