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| 1 | Quaternary biogenic opal records in the South China Sea: Linkages to East Asian monsoon, global ice volume and orbital forcing显示文摘Particulate fluxes investigated in the central South China Sea (SCS) during 1993―1996 indicate that opal flux can be used to show primary productivity change, which provides a foundation for tracing the evolutionary relationship between the surface productivity and East Asian monsoon in the SCS during the late Quaternary glacial and interglacial periods. Based on the studies of opal % and their mass accumulation rates (MAR) at the six sites recovered from the SCS during the “Resolution” ODP Leg 184 and “Sonne” 95 cruise of the Sino-Germany cooperation, opal % and their MARs increased evidently in the northern sites since 470―900 ka, and they enhanced and reduced, respectively, during the glacial and interglacial periods. Whereas they increased obviously in the southern sites since 420―450 ka, and they augmented and declined, respectively, during the interglacial and glacial periods. The vari- ability in opal % and their MARs in the late Quaternary glacial cyclicity indicate the “seesaw” pattern of surface productivity in the SCS. The winter monsoon intensified during the glacial periods, surface productivity increased and decreased, respectively, in the northern and southern SCS. The summer monsoon strengthened during the interglacial periods, surface productivity increased and decreased, respectively, in the southern and northern SCS. The cross spectral analyses between the opal % in the northern and southern SCS during the Quaternary and global ice volume (δ 18O) and orbital forcing (ETP) indicate that the East Asian winter and summer monsoons could be ascribed to the different drive mechanisms. On the orbital time scale, the global ice volume change could be a dominant factor for the winter monsoon intension and temporal variations. As compared with the winter monsoon, the correlative summer solar radiation with the obliquity and precession in the Northern Hemisphere could be a mostly controlling factor for the summer monsoon intension and temporal variations. | WANG RuJian JIAN ZhiMin XIAO WenShen TIAN Jun LI JianRu CHEN RongHua ZHENG YuLong CHEN JianFang | 2007 | Science China Earth Sciences2007，50，5： | 9 |
| 2 | Late Quaternary ice-rafted detritus events in the Chukchi Basin, western Arctic Ocean显示文摘The late Quaternary ice rafted detritus (IRD) events in the Chukchi Basin, western Arctic Ocean are indications of the provenance of the coarser detritus and ice export events, and also document the evolutionary histories of Beaufort Gyre and the North American Ice Sheet (NAIS). The sediment of core M03 from the Chukchi Basin was selected to study the regional response to the ice export events and the NAIS variability. The stratigraphic framework of M03 was established by a combination of lithological features and downcore color change cycles, AMS14C dating with foraminifera abundance and IRD events. The core was also compared with the adjacent core NWR 5 from the Northwind Ridge area. The core extends back to Marine Isotope Stage (MIS) 7. A sedimentary hiatus of 10―20 ka might occur between 16 to 20 cm core depth. Seven IRD events are distinguished from the studied core and are presented during the early MIS 1, MIS 3, MIS 5 and late MIS 7. These IRD are transported by sea ice and icebergs, which were exported to the Beaufort Sea from the M'Clure Strait Ice Stream, Canadian Arctic Archipelago, and brought to the Chukchi Basin by the Beaufort Gyre. | WANG RuJian XIAO WenShen LI WenBao SUN YeChen | 2010 | Chinese Science Bulletin2010，55，4： | 7 |
| 3 | Stable oxygen and carbon isotopes from the planktonic foraminifera Neogloboquadrina pachyderma in the Western Arctic surface sediments:Implications for water mass distribution显示文摘Neogloboquadrina pachyderma is the most abundant planktonic foraminifera species found in the modern polar oceans.The δ18O and δ13C of N.pachyderma from the Western Arctic Ocean sediments were analyzed to reveal the implications of the proxies to environmental changes.The δ18O from N.pachyderma in the Chukchi Sea reflect the water mass distribution in this area.Heavier δ18O values were found along the Anadyr Current(AC) and lighter values in the central and eastern Chukchi Sea.These may reflect the freshwater signal from the Alaska Coastal Current(ACC) and Bering Sea Shelf Water(BSSW) .The light δ18O signature in the high Arctic basin comes from the freshwater stored in the Arctic surface layer.The δ13C distribution pattern in the Chukchi Sea is also influenced by the current system.High primary productivity along the AC results in heavy δ13C.The relatively low primary productivity and the freshwater component from the BSSW and ACC may be the reason for this light δ13C signal in the central and eastern Chukchi Sea.Our data reveal the importance of well ventilated Pacific Water through the Chukchi Sea into the Arctic Ocean. | XIAO Wenshen WANG Rujian CHENG Xinrong | 2011 | Advances in Polar Science2011，22，4： | 3 |
| 4 | Paleoceanographic records and sea ice extension history on the slope of the northern Bering Sea over the last 100 ka B.P.显示文摘Quantitative analytic results of the biogenic components in Core B2-9 from the northern Bering Sea slope indicate that the coarse fraction and opal content, serving as proxies of surface productivity, have increased stepwise since the marine isotope stage(MIS)5.3, reflecting periodic enhancement in surface productivity.The surface productivity attained its highest level during the Holocene, followed by MIS 3.2 to 2 and then MIS 5.3 to 3.3 with a lowest level. High total organic carbon(TOC) contents, together with high C/N ratios, which stand mostly between 7 and 20, show that the TOC was deposited from mixing sources. Therefore,one has to be cautious to use TOC as a proxy of surface productivity.The high TOC and C/N ratio during MIS 5.1, 3.3 to 3.2 and the Holocene reflect that the terrigenous organic matter input increased during interglacial periods.Increases in the fine- and silt-grained terrigenous components from MIS 5.3 to the middle Holocene imply that with the cooling climate, sea ice on the Bering Sea slope extended continuously. Ice-rafted and charcoal detritus increased during glacial, interstadial and the last deglaciation periods and decreased during interglacial periods, suggesting that sea ice on the slope increased and melted, respectively, during glacial and interglacial periods. The extension of sea ice during glacial periods,which was linked with the climate over the North American Continent, responded to global climate change during late Quaternary glacial and interglacial cycles. | WANG Rujian LI Xia XIAO Wenshen XIA Peifen CHEN Ronghua | 2005 | Acta Oceanologica Sinica2005，24，6： | 3 |
| 5 | Paleoenvironmental implications of Holocene long-chain n-alkanes on the northern Bering Sea Slope显示文摘The records of high-resolution terrestrial biological markers(biomarkers) from Core B2-9 from the northern Bering Sea Slope over the last 9.6 ka BP were presented in the study.Variations in input of terrestrial long-chain nalkanes(referred to as n-alkanes) and vegetation structure in their source regions were investigated.The results show that the nC_(27) is the main carbon peak and has the greatest contribution rate of the total n-alkane content;this might be related to the abundance of woody plants and their spatial distribution in the source region.nC_(23) is another n-alkane having a relatively high content;this was mainly derived from submerged plants widespread along the coastal areas in the northern hemisphere.Total n-alkane content dropped quickly at ca.7.8 ka BP,ca.6.7 ka BP and ca.5.4 ka BP,and was followed by four relatively stable stages mostly controlled by sea-level rise,climate change and vegetation distribution in the source region.Variation in carbon preference index(CPI)indicates that the n-alkanes primarily originated from higher land plants,and the average chain length(ACL) and nC_(31)/nC_(27) ratio reveal the relatively stable presence of woody/herbaceous plants during the Holocene,and dominate woody plants in most of the time.Simultaneous variation in total n-alkane content,nC_(27) content and its contribution,CPI,ACL and nC_(31)/nC_(27) ratio over several short periods suggest that the growth rate of the woody plant n-alkane contribution was lower than that of herbaceous plants and fossil n-alkanes under the particular climatic conditions of the source region. | ZHANG Haifeng WANG Rujian XIAO Wenshen | 2017 | Acta Oceanologica Sinica2017，36，8： | 2 |
| 6 | Paleoceanographic records in the Chukchi Basin, western Arctic Ocean during the late Quaternary显示文摘The late Quaternary paleoceanographic changes in the western Arctic Ocean are revealed by quantitative studies of foraminiferal abundance, ice-rafted detritus (IRD) and its mineralogical and petrological compositions, planktonic Neogloboquadrina pachyderma (sin.) (Nps)-δ 18 O and -δ 13 C, biogenic and non-biogenic components in Core M03 token from the Chukchi Basin during the Second Chinese National Arctic Expedition cruise. Seven IRD events appeared at MIS 7, 5, 3 and 1. These IRD were carried in massive icebergs, which were exported to the Beaufort Sea through the M'Clure Strait Ice Stream, Canadian Arctic Archipelago, and then transported into the Chukchi Basin by the Beaufort Gyre. Low IRD deposition occurred during the glacial times when more extended ice cover and weakened Beaufort Gyre, while the open water condition and the intensified Beaufort Gyre during interglacial periods favored the IRD deposition. Therefore, the IRD events not only indicate the provenance of coarser detritus and ice export events, but also reflect the evolutionary histories of the Beaufort Gyre and North American ice sheet. Seven light Nps-δ 18 O and -δ 13 C excursions could respond to enhanced rates of sea ice formation resulting in the production and sinking of isotopically light brines, but was irrelevant to the warm Atlantic water and freshwater inputs. Whereas, the heavy Nps-δ 18 O and -δ 13 C values separately reflect the lessened Arctic freshwater and Pacific water, and well-ventilated surface water from the continental shelf and halocline water. Variations of CaCO 3 content and planktonic foraminiferal abundance during the interglacial and glacial periods can demonstrate the incremental or diminishing input of the Atlantic water, while the total organic carbon (TOC) and opal contents increased and decreased during the glacial and interglacial periods, respectively, which could be related to the TOC degradation, opal dissolution and redox conditions of interface between the bottom water and sediments. | WANG Rujian XIAO Wenshen SHAO Lei CHEN Jianfang GAO Aiguo | 2012 | Acta Oceanologica Sinica2012，31，1： | 1 |
| 7 | Stable oxygen and carbon isotopes in planktonic foraminifera Neo- globoquadrina pachyderma in the Arctic Ocean: An overview of published and new surface-sediment data显示文摘 | Xiao Wenshen Wang Rujian Polyak Leonid | 2014 | Marine Geol ogy2014，352，： | 1 |
| 8 | Ice rafting history and paleoceanographic reconstructions of Core 08P23 from southern Chukchi Plateau, western Arctic Ocean since Marine Isotope Stage 3显示文摘Multiproxy investigations have been performed on Core 08P23 collected from the Chukchi Plateau, the western Arctic Ocean, during the Third Chinese National Arctic Expedition. The core was dated back to Marine Isotope Stage(MIS) 3 by a combination of Accelerator Mass Spectrometric(AMS) carbon-14 dating and regional core correlation. A total of five prominent ice-rafted detritus(IRD) events were recognized in MIS 2 and MIS 3. The IRD sources in MIS 3 are originated from vast carbonate rock outcrops of the Canadian Arctic Archipelago and clastic quartz in MIS 2 may have a Eurasian origin. Most δ18O and δ13C values of Neogloboquadrina pachyderma(sinistral)(Nps) in Core 08P23 are lighter than the average values of surface sediments. The lighter δ18O and δ13C values of Nps in the two brown layers in MIS 1 and MIS 3 were resulted from meltwater events; and those in the gray layers in MIS 3 were caused by the enhanced sea ice formation. The δ18O values varied inversely with δ13C in MIS 2 indicate that the study area was covered by thick sea ice or ice sheet with low temperature and little meltwater, which prevented the biological productivity and sea-atmosphere exchange, as well as water mass ventilation. The covaried light values of δ18O and δ13C in MIS 1 and MIS 3 were resulted from meltwater and/or brine injection. | ZHANG Taoliang WANG Rujian XIAO Wenshen CHEN Zhihua CHEN Jianfang CHENG Zhenbo SUN Yechen | 2015 | Acta Oceanologica Sinica2015，34，3： | 1 |
| 9 | Late Quaterna ry paleoenvironmental changes revealed by multi-proxy re cords from the Chnkchi Abyssal Plain, western Arctic Ocean 显示文摘 | Wang Rujian Xiao Wenshen Mfirz C | 2013 | Global and Planetary Change2013，108，： | 1 |
| 10 | The marine environmental evolution in the northern Norwegian Sea revealed by foraminifera during the last 60 ka显示文摘Both planktonic and benthic foraminifera were identified in a sediment core collected from the northern Norwegian Sea to reconstruct the paleoceanographic evolution since the last glaciation.The assemblages and distribution patterns of dominant foraminiferal species with special habitat preferences indicated that three marine environments occurred in the northern Norwegian Sea since 62 ka BP:(1)an environment controlled by the circulation of the North Atlantic Current(NAC);(2)by polynya-related sinking of brines and upwelling of intermediate water surrounding the polynya;(3)by melt-water from Barents Sea Ice Sheet(BSIS).At 62-52.5 ka BP,a period with the highest summer insolation during the last glaciatial period,intensification of the NAC led to higher absolute abundances and higher diversity of foraminiferal faunas.The higher abundance of benthic species Cibicidoides wuellerstorfi indicates bottom water conditions that were well-ventilated with an adequate food supply;however,higher abundances of polar planktonic foraminiferal species Neogloboquadrina pachyderma(sin.)indicate that the near-surface temperatures were still low.During mid-late Marine Isotope Stage(MIS)3(52.5-29 ka BP),the marine environment of the northern Norwegian Sea alternately changed among the above mentioned three environments.At 29-17ka BP during the last glacial maximum,the dominant benthic species Bolivina arctica from the Arctic Ocean indicates an extreme cold bottom environment.The BSIS expanded to its maximum extent during this period,and vast polynya formed at the edge of the ice sheet.The sinking of brines from the formation of sea ice in the polynyas caused upwelling,indicated by the upwelling adapted planktonic species Globigerinita glutinata.At 17-10 ka BP,the northern Norwegian Sea was controlled by melt-water.With the ablation of BSIS,massive amounts of melt water discharged into the Norwegian Sea,resulting in strong water column stratification,poor ventilation,and an oligotrophic bottom condition,which ledto a drastic decline in the abundance and diversity of foraminifera.At 10-0 ka BP,the marine environment was transformed again by the control of the NAC,which continues to modern day.The abrupt decrease in relative abundance of Neogloboquadrina pachyderma(sin.)indicates a rise in near-surface temperature with the strengthening of the NAC and without the influence of the BSIS. | WANG Weiguo ZHAO Mengwei YANG Jichao XIAO Wenshen WANG Haoyin LIU Yang | 2021 | Advances in Polar Science2021，32，3： | 0 |
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