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Distribution of dinoflagellate cysts in Yellow Sea sediments

Acta Oceanologica Sinica 2013年第9期32卷 91-98页

作者： SHIN Hyeon Ho lim dhongil PARK Soung-Yun HEO Seung KIM So-Young Library of Marine Samples Korea Institute of Ocean Science and Technology West Sea Fisheries Research Institute National Fisheries Research&Development Institute Division of Polar Climate Research Korea Polar Research Institute

To investigate the distribution, abundance, and species composition of dinoflagellate cysts in the Yellow Sea, surface sediment samples were collected at 37 sites, including the Korean dump site. Twenty-one di- noflagellate cyst taxa were identified, with the assemblages dominated mainly by Spiniferites bulloideus, Operculodinium centrocarpum, and cyst of Alexandrium catenella/tarnarense type. A high frequency of O. centrocarpum in the Yellow Sea was observed for the first time, and it is likely that this can be attributed to the dynamics of the Yellow Sea Cold Water Mass and the Changjiang （Yangtze） River runoff. Total cyst concentrations ranged from 23 to 48 442 cysts/g dry weight, and high cyst concentrations were recorded adjacent to the dumping site. This result suggests that anthropogenic activities such as ocean dumping s- timulate the growth of dinoflagellates in the Yellow Sea, which in turn leads to high levels of dinoflagellate cyst production.

关键词： Yellow Sea dumping site dinoflagellate cyst Alexandrium catenella/tamarense type Operculo- dinium centrocarpum

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Sediment provenance discrimination in northern Okinawa Trough during the last 24 ka and paleoenvironmental implication:rare earth elements evidence

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Journal of Rare Earths 2012年第11期30卷 1184-1190页

作者：徐兆凯李铁刚常凤鸣 CHOI Jinyong lim dhongil 徐方建 Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences Department of Oceanography Kunsan National University South Sea Institute Korea Ocean Research and Development Institute School of Geo-sciences China University of Petroleum

Rare earth elements （REE） compositions and discriminant function were successfully used to examine high resolution sediment source changes in the northern Okinawa Trough over the last 24.1 ka, especially for the influence from the Yellow River and the Tsushima Warm Current （TWC） that has not been well solved. Variations of these parameters were clearly divided into three distinct depositional units. During Interval 1 （24.1-16.0 ka BP）, the paleo-Yellow River and the paleo-Yangtze River mouths were situated near the studied area and could have played major roles in the sedimentation therein. In Interval 2 （16.0-7.3 ka BP）, these river mouths gradually retreated with global sea-level rise, leading to less fluvial inputs from them to the northern Okinawa Trough. Meanwhile, formation of the TWC could carry some sediment loads of Taiwan to the studied core, especially during its late phase （8.0-7.3 ka BP）. Modem oceanographic conditions, with a predominance of the TWC, were finally established since the beginning of Interval 3, causing more ten＇igenous contribution from Taiwan to the studied area. Subsequently, modem depositional environments mainly influenced by the Yellow River, the Yangtze River, and the TWC were finally formed.

关键词： sediment provenance discriminant function rare earth elements Tsushima Warm Current northern Okinawa Trough

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Geochemistry of rare earth elements in the mid-late Quaternary sediments of the western Philippine Sea and their paleoenvironmental significance

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Science China Earth Sciences 2014年第4期57卷 802-812页

作者： XU ZhaoKai LI TieGang WAN ShiMing YIN XueBo JIANG FuQing SUN HanJie JinYong CHOI dhongil lim Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences Department of Oceanography Kunsan National University South Sea Institute Korea Institute of Ocean Science and Technology

Based on a δ18O chronology,rare earth elements(REE) and other typical elements in sediments from core MD06-3047 in the western Philippine Sea were analyzed to constrain the provenances of the sediments and investigate quantitative changes in the Asian eolian input to the study area over the last 700 *** the competing processes that might affect REE compositions,sediment provenance is the most important *** analysis suggests that the study sediments have two provenance end-members;local volcanic sources are dominant,and eolian dust from the Asian continent has a smaller *** glacial periods,eolian input to the western Philippine Sea was *** contrast,material supply from local volcanics increased during interglacial *** in eolian input to the study area were probably related to the strength of the East Asian winter monsoon(EAWM) as well as aridity in the Asian continent on an orbital time scale,and were partly influenced by local control factors on shorter time ***,we propose that the present study expands the application of the REE-based method for quantitatively estimating the eolian component from the mid-latitude northern Pacific to the low-latitude western ***,the study preliminarily confirms the influence of EAWM-transported eolian material on sedimentation in the western Philippine Sea since 700 ka.

关键词：第四纪沉积物西菲律宾海稀土元素地球化学特征古环境意义东亚冬季风亚洲大陆时间尺度

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