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Morphotype dependence of Globigerinoides ruber(white)and Trilobatus sacculifer Mg/Ca ratios in the western tropical Pacific:implications for reconstructing the mixed-layer depth

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Acta Oceanologica Sinica 2023年第11期42卷 35-43页

作者： Qi Jia Tiegang Li zhifang xiong Bingbin Qin First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266061China

Planktonic foraminifer Globigerinoides ruber(white)and Trilobatus sacculifer are the most frequently used mixedlayer dwelling species for reconstructing past oceanic ***,the Mg/Ca ratios of these two foraminiferal species have been used for reconstructing tropical/subtropical changes in sea surface temperature(SST).However,these two species have different morphotypes,of which the spatial and temporal differences in Mg/Ca ratios and their influencing factors are still *** objective is to investigate the potential differences between the Mg/Ca ratios of these different morphotypes of ***(white)and *** in the western Philippine Sea(WPS)and determine their implications for the reconstruction of SST and upper-ocean ***/Ca measurements are made on two basic morphotypes of ***(white)[sensu stricto(s.s.)and sensu lato(s.l.)]and ***[with(w)and without(w/o)a sac-like final chamber]on samples of Site MD06-3047B from the *** results reveal that Mg/Ca ratios of different *** morphotypes show consistent differences;and those of *** morphotypes show staged variations since MIS *** is suggested to select a single morphotype for reconstructing SST changes using the Mg/Ca ratios of *** and *** in the ***,the Mg/Ca ratios between *** *** *** s.l.[Δ(Mg/Ca)_(*** s.s.-s.l.)]downcore MD06-3047B covaries with indexes of summer *** with the core-top results,showing regional variation of differences in theΔ(Mg/Ca)_(*** s.s.-s.l.)over the western tropical Pacific,we propose thatΔ(Mg/Ca)_(*** s.s.-s.l.)may tend to reflect summer mixed layer depth.

关键词： morphotypes Globigerinoides ruber(white) Trilobatus sacculifer Mg/Ca ratios mixed-layer depth

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Revisiting the dependence of thermocline-dwelling foraminiferal B/Ca on temperature and [CO32-], and its application in reconstruction of the subsurface carbonate system in the tropical western Pacific since 24 ka

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Acta Oceanologica Sinica 2019年第9期38卷 71-86页

作者： Jingteng Guo Tiegang Li zhifang xiong Xiaohua Qiu Fengming Chang CAS Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China First Institute of Oceanography Ministry of Natural Resources Qingdao 266061 China University of Chinese Academy of Sciences Beijing 100049 China Laboratory for Marine Geology and Environment Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266237 China No. 1 Institute of Geology and Mineral Resources of Shandong Province Jinan 250014 China

The B/Ca ratio of planktonic foraminifer shells has been used as a proxy for reconstructing past ocean carbonate chemistry. However, recent studies have revealed significant uncertainties associated with this proxy, such as whether seawater temperature or [CO^2-3 ] is the dominant control on the partition coefficient (KD) of planktonic foraminiferal B/Ca. To address these uncertainties and thus improve our understanding of the planktonic foraminiferal B/Ca proxy, we analysed B/Ca ratios in the tests of Neogloboquadrina dutertrei (300- 355 μm) and Pulleniatina obliquiloculata (355- 400 μm) in surface sediment samples from the tropical western Pacific and South China Sea. The relationship between these B/Ca ratios and bottom water calcite saturation states (Δ[CO^2-3 ]) is weak, thus suggesting only a small dissolution effect on the B/Ca of the two species. The correlation coefficients (R2) between the B/Ca ratios of N. dutertrei and P. obliquiloculata and environmental parameters (e.g., temperature, salinity, phosphate, DIC and ALK) in the tropical western Pacific and South China Sea are not high enough to justify using B/Ca ratios as a palaeoenvironmental proxy in the study areas. The significant correlation between KD values of N. dutertrei and P. obliquiloculata and carbonate system parameters (e.g.,[CO^2-3 ], DIC, ALK, pH and [HCO^-3 ]) in the study area reflect chemical links between the KD denominator and these variables. Based on our surface sediment calibration, an empirical relationship between the KD of N. dutertrei and temperature is proposed in the tropical western Pacific. We also generated a record of B/Ca ratios in N. dutertrei (300 -355 μm) from Core MD06-3052 in the tropical western Pacific over the past 24 ka to evaluate the application of the revised B/Ca proxy method. Based on the reconstructed empirical relationship for B/Ca and subsurface seawater ALK, we estimated subsurface seawater carbonate system parameters in the tropical western Pacific si

关键词： planktonic foraminifera B/Ca carbonate chemistry tropical western Pacific South China Sea

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Productivity in the Southern Ocean Antarctic Zone during the Northern Hemisphere Glaciation(NHG)and its link to atmospheric pCO_(2)

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Science China Earth Sciences 2024年第7期67卷 2242-2252页

作者： Yiming WU Jingteng GUO Xiangyu ZHAO Wenshen XIAO Heng LIU zhifang xiong Tiegang LI Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Key Laboratoryof Polar Ecosystem and Climate Change Shanghai Jiao Tong UniversityMinistry of EducationShanghai 200030China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

A decrease in atmospheric CO_(2)partial pressure(pCO_(2))is considered an important prerequisite for the onset and intensification of Northern Hemisphere Glaciation(NHG).However,how the ocean sequestered missing CO_(2)during the NHG is still *** in surface productivity and deep ventilation in the Southern Ocean(SO)have been proposed to explain the variations in atmospheric pCO_(2)over the last eight glacial cycles,but it is unclear whether these mechanisms contributed to the decrease in atmospheric pCO_(2)during the *** titanium-normalized contents and mass accumulation rates of biogenic opal and total organic carbon from the International Ocean Discovery Program(IODP)Expedition 374 Site U1524A,we reconstruct the productivity in the Ross Sea,Antarctica,from 3.3 Ma to 2.4 *** productivity records exhibit a long-term decreasing trend and several distinct phased evolutionary ***,the local productivity fluctuated dramatically during 3.3-3.0 Ma,decreased gradually during 3.0-2.6 Ma,and remained relatively constant during 2.6-2.4 *** comparing productivity with its potential influences,we infer that the phased and long-term evolutions of productivity were mainly controlled by changes in deep ocean *** ice expansion might have decreased productivity during 3.3-3.0 Ma by light *** in eolian dust input have little effect on *** analysis revealed no coupling linkage between productivity and atmospheric pCO_(2),indicating that the productivity in the SO Antarctic Zone(AZ)was not the main factor controlling the atmospheric CO_(2)decrease during the *** improve our understanding of the role of SO processes in the NHG,further studies should focus on the potential influences of deep ocean ventilation on atmospheric pCO_(2)in the AZ,and similar studies should also be extended to the sea area in the Subantarctic Zone.

关键词： Ross Sea Biogenic opal Total organic carbon Deep ocean ventilation Sea ice Ocean carbon cycle

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Calcification of planktonic foraminifer Neogloboquadrina pachyderma(sinistral) controlled by seawater temperature rather than ocean acidification in the Antarctic Zone of modern Sothern Ocean

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Science China Earth Sciences 2022年第9期65卷 1824-1836页

作者： Qianwei SONG Bingbin QIN Zheng TANG Yanguang LIU Zhihua CHEN Jingteng GUO zhifang xiong Tiegang LI Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and TechnologyQingdao 266237China

Neogloboquadrina pachyderma(sinistral), the dominant planktonic foraminiferal species in the mid-to-high latitude oceans, represents a major component of local calcium carbonate(CaCO) production. However, the predominant factors,governing the calcification of this species and its potential response to the future marine environmental changes, are poorly understood. The present study utilized an improved cleaning method for the size-normalized weight(SNW) measurement to estimate the SNW of N. pachyderma(sin.) in surface sediments from the Amundsen Sea, the Ross Sea, and the Prydz Bay in the Antarctic Zone of the Southern Ocean. It was found that SNW of N. pachyderma(sin.) is not controlled by deep-water carbonate dissolution post-mortem, and can be therefore, used to reflect the degree of calcification. The comparison between N. pachyderma(sin.) SNW and environmental parameters(temperature, salinity, nutrient concentration, and carbonate system) in the calcification depth revealed that N. pachyderma(sin.) SNWs in the size ranges of 200–250, 250–300, and 300–355 μm are significantly and positively correlated with seawater temperature. Moreover, SNW would increase by ~30% per degree increase in temperature, thereby suggesting that the calcification of N. pachyderma(sin.) in the modern Antarctic Zone of the Southern Ocean is mainly controlled by temperature, rather than by other environmental parameters such as ocean acidification. Importantly, a potential increase in calcification of N. pachyderma(sin.) in the Antarctic Zone to produce CaCOwill release COinto the atmosphere. In turn, the future ocean warming will weaken the ocean carbon sink, thereby generating positive feedback for global warming.

关键词： Planktonic foraminiferal SNW Sonication CaCO3 production Ocean carbon cycle Climate change

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Provenance of colorless and brown volcanic glass in late Pleistocene tephra layers in the Western Philippine Sea

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Journal of Oceanology and Limnology 2024年第5期42卷 1438-1449页

作者： Fuqing JIANG Zhishun ZHANG Zhaohui ZHANG Guoliang ZHANG Peng HUANG Xiaojing ZHOU zhifang xiong Congying LI Tiegang LI Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Institute of Marine Chemistry and Environment Ocean CollegeZhejiang UniversityZhoushan 316021China College of Marine Technology and Environment Dalian Ocean UniversityDalian 116023China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China

Tephra layers in the western Philippine Sea,characterized by abundant volcanic glass shards,may provide crucial evidence on the eruption history of volcanoes and tectonic evolution of the western Pacific.A 220-ka sediment core from the Benham Rise in the western Philippine Sea offers new insights into the provenance of four intercalated tephra layers(T1–T4,in chronological order)containing either colorless or brown glass *** to primitive mantle,all glass shards are enriched in large-ion lithophile elements,such as Rb,Cs,and Pb,and depleted in high field-strength elements,such as Th,Nb,and Ta,indicating a subduction-related *** colorless glass shards are characterized by high SiO_(2)(>78%)and light rare earth element(LREE)contents as well as high La/Sm ratios(>9),low FeO and MgO contents(100),pointing to a rhyolitic composition and a medium-K calc-alkaline serial *** contrast,the brown glass shards are characterized by lower SiO_(2)(<63%)and LREE contents,higher FeO,MgO,and CaO contents,lower La/Sm(<6)and Ba/Th(<75),and similar Sr/Y ratios(<15),indicating derivation from medium to high-K calc-alkaline andesite *** glass shards from layers T3(152 ka)and T4(172 ka)were correlated with volcanic deposits from the Taal and Laguna Caldera in the Maccolod Corridor,respectively,while the colorless glass shards from layers T1(36.5 ka)and T2(61.2 ka)were likely sourced from the Irosin Caldera in the Bicol *** the provenance of late Pleistocene tephra layers in the western Philippine Sea is helpful to complement a Philippine volcanic history and establish a regional tephrochronostratigraphy.

关键词： volcanic glass provenance chemical composition Philippine Sea late Pleistocene

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Relating the composition of continental margin surface sediments from the Ross Sea to the Amundsen Sea,West Antarctica,to modern environmental conditions

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Advances in Polar Science 2022年第1期33卷 55-70页

作者： WANG Jiakai LI Tiegang TANG Zheng xiong zhifang LIU Yanguang CHEN Zhihua CHANG Fengming Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural and ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

Investigating the multiple proxies involving productivity,organic geochemistry,and trace element(TE)enrichment in surface sediments could be used as paleoenvironment archives to gain insights into past and future environmental conditions *** present redox-sensitive TEs(Mn,Ni,Cu,U,P,Mo,Co,V,Zn,and Cd),productivity-related proxies(total organic carbon and opal),and total nitrogen and CaCO_(3) contents of bulk surface sediments of this *** productivity proxies from the shelf and coastal regions of the Ross and the Amundsen seas showed that higher productivity was affiliated with an area of nutrient-rich deep water *** upwelling of weakly corrosive deep water may be beneficial for preserving CaCO_(3),while highly corrosive dense water,if it forms on the shelf near the coastal region(coastal polynya),could limit the preservation of CaCO_(3) in modern *** were no oxic or anoxic conditions in the study area,as indicated by the enrichment factors of redox-sensitive TEs(Mn,Co,and U).The enrichment factor of Cd,which is redox-sensitive,indicated suboxic redox conditions in sediment environments because of high primary productivity and organic matter preservation/*** enrichment factors of other redox-sensitive TEs(P,Ni,Cu,V,and Zn)and the correlations between the element/Ti ratio with productivity and nutrient proxies indicated that the organic matter decomposed,and there was massive burial of phytoplankton *** was variation in the enrichment,such that sediments were enriched in P,Mo,and Zn,but depleted in Ni,Cu,and V.

关键词： redox nutrient productivity shelf and coastal region offshore of Ruppert and Hobbs coasts Ross Sea Amundsen Sea

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Response of the northwestern Pacific upper water δ^(13)C to the last deglacial ventilation of the deep Southern Ocean

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Chinese Science Bulletin 2011年第24期56卷 2628-2634页

作者： CHEN ShuangXi LI TieGang TANG Zheng QIU XiaoHua xiong zhifang NAN QingYun XU ZhaoKai CHANG FengMing Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology Qingdao Institute of Marine Geology Ministry of Land and Resources of China Qingdao 266071 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The deglacial δ~13C minimum events that originated from the ventilation of the deep Southern Ocean around Antarctica, have been recorded in a range of marine sediments from the southern to tropical oceans in late Pleistocene. However, the broad δ~13C minimum event was also reported as far as to the northern middle latitudes, in northwestern Pacific marginal sea areas, during the last deglaciation. In the northwestern Pacific, forcing from the northern high latitudes is strongly expressed, while the records of in- fluence from the southern high latitudes are few. The Kuroshio Source Region (KSR) forms a boundary between the northwestern Pacific and the southern, tropical Pacific. So, high-resolution planktonic foraminiferal records in core MD06-3054 from the KSR are well positioned to identify signals from the southern hemisphere in the northwestern Pacific. Planktonic foraminiferal tests from the upper 1030 cm of the core were subject to AMS14C, carbon and oxygen isotopic measurements. A negative excursion was found to occur from about 20.0-6.0 ka BP in δ~13C records of both surface (Globigerinoides ruber) and subsurface (Pulleni- atina obliquiloculata) dwellers, but the overall trends of the two curves have reversed since 26.5 ka BP. Moreover, the δ~13C rec- ord of G. ruber (the surface dweller) shows a robust link to the record of atmospheric CO2, and its changes precede the records of P. obliquiloculata (the subsurface dweller). According to the hydrologic conditions, the broad δ~13C minimum event recorded in the KSR is also a response to the increasing ventilation of the deep Southern Ocean around Antarctica during the last deglaciation. The inconsistency between the records of the surface and subsurface dwellers was possibly caused by the ways that the low δ~13C signal was transmitted. Subsurface water primarily received the low δ~13C signal from the Antarctic Intermediate Water (AAIW), whereas the surface water was probably mainly impacted by atmospheric CO2 i

关键词：西北太平洋边缘水文条件南大洋通风信号传输方式末次冰消期高纬度地区中纬度地区

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Sea-level changes controlled detrital sediment inputs to the Bicol Shelf in the western Philippine Sea since 150 ka

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Journal of Oceanology and Limnology 2020年第4期38卷 1153-1168页

作者： ZHANG Zhishun JIANG Fuqing LI Tiegang YANG Dezhou ZHOU Xiaojing xiong zhifang QIU Xiaohua JIA Qi YAN Yu FENG Xuguang Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of ScienceQingdao 266071China School of Marine Science and Environment Dalian Ocean UniversityDalian 116023China No.1 Institute of Geology and Mineral Resources of Shandong Province Jinan 250014China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China

Detrital sediments derived from the Philippine Islands are one of the main sources of deep-sea sediments in the western Philippine ***,systematic research on their characteristics and transport mechanisms are *** used parametric end-member analysis to quantitatively partition the grain size of detrital sediments in core MD06-3052 from the Bicol Shelf in the western Philippine Sea;three endmembers EMI,EM2,and EM3,whose respective modes were at 2,10,and 45 μm,were *** also measured the Sr and Nd isotopic compositions of different size fractions(20 μm) of the detrital sediments and the results showed that the detrital sediments mainly originate from the Philippine *** EMI and EM2 are transported to the Bicol Shelf mainly by surface and bottom currents from the islands,and component EM3 is delivered by gravity flow from the exposed shelf during low sea-level *** content of the total detrital fraction and the three end-members,as well as the mass accumulation rates(MARs) of the coarse detritus(EM2 and EM3),were considerably higher during glacial periods(40-14 ka and 150-130 ka) than during other intervals;the glacials corresponded to a low sea level,while the MAR of the fine detritus(EMI) did not increase remarkably during 40-14 *** therefore concluded that the input of coarse detritus to the Bicol Shelf from the islands was mainly controlled by sea-level *** of the input of fine-grained detritus(EM1) was influenced not only by sea level but also by ocean currents and regional ***,our results help understand "source-to-sink" processes in the western Pacific marginal seas and their response to global change.

关键词： Bicol Shelf late Pleistocene grain size sea level change

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The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximμm

The silicon isotope composition of Ethmodiscus rex laminated...

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2015年全国沉积学大会

作者： zhifang xiong Tiegang Li Fengming Chang Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of Sciences

The cause of massive blooms of Ethmodiscus rex laminated diatom mats(LDMs)in the eastern Philippine Sea(EPS)during the Last Glacial Maximμm(LGM)remains *** order to better understand the mechanism of formation of ***...

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Rapid precipitation change in the western Philippine Sea linked to North Atlantic climate during the last deglaciation

Rapid precipitation change in the western Philippine Sea lin...

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中国古生物学会微体学分会第十六次学术年会、中国古生物学会化石藻类专业委员会第十七次学术年会暨和政化石论坛

作者： zhifang xiong Tiegang Li Fengming Chang Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography State Oceanic Administration

The cause of rapid hydrological changes in the West Pacific Warm Pool(WPWP)during the last deglaciation remains *** order to better understand the response of tropical hydrology in the WPWP to abrupt climate change events in the North Atlantic Ocean,the precipitation variations during the last deglaciation were extracted from the proxy records of chemical weathering and terrigenous input in Luzon,*** histories of chemical weathering and terrigenous input since 27 kyr were reconstructed by chemical index of alteration(CIA),newly proposed chemical weathering index(CWI)and K/Al,and TOC/TN,δ13Corg,Ti/Ca,terrigenous abundance and fluxes from the International Marine Global Change Study Program(IMAGES)core MD06-3054 in the western Philippine Sea(WPS).The intensity of chemical weathering during the Last Glacial Maximum(LGM)was equal to or slightly higher than during the Holocene in *** unusual pattern of chemical weathering,not explained by low air temperature and decreased precipitation during the LGM,can be attributed to the reworking of unconsolidated shelf sediments along eastern Luzon during the LGM sealevel *** rapid changes on chemical weathering with high intensity during the Heinrich event 1(H1)and Younger Dryas(YD)and low intensity during the B?lling-Aller?d(B/A)were linked to rapid precipitation variations in the WPS during the last *** high terrigenous input during the LGM relative to during the Holocene was controlled by the changes of sealevel rather than precipitation in the *** input shows long-term decreasing trends superposed by rapid changes with high value during the H1 and YD but low value during the B/A,due to gradually reduced sealevel and rapid precipitation changes in the WPS during the last deglaciation,*** proxy records of chemical weathering and terrigenous input suggest high rainfall during the H1 and YD but low rainfall during the B/A offshore Lzuon,consistent with r

关键词： precipitation chemical weathering terrigenous input ITCZ ENSO AMOC

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