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Climate evolution of southwest Australia in the Miocene and its main controlling factors

Science China Earth Sciences 2022年第6期65卷 1104-1115页

作者： Tianqi SUN Zhaokai XU fengming chang Tiegang LI Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266061China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Quaternary Science and Global change Xi’an 710061China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Sedimentology and Metallogeny First Institute of OceanographyMNRQingdao 266061China

At present, the seasonal melting and expansion of the Antarctic ice sheet affect the location and intensification of the westerlies, as well as the precipitation and continental weathering and erosion in southwest Australia. The Miocene was an important period when the Earth's climate state transitioned from a warmhouse to an icehouse and the East Antarctic Ice Sheet underwent large-scale melting and expansion. At that time, Australia was closer to the Antarctic region than it is now. This makes Australia an ideal target area for studying the coupling relationship among the atmosphere, hydrosphere, lithosphere, and cryosphere. Based on the comprehensive analysis of the siliciclastic mass accumulation rate, grain size, clay minerals, and elemental composition of the sediments at Site U1516 of the International Ocean Discovery Program Expedition 369, we reconstructed the Miocene climate evolution and the continental weathering and erosion history of southwest Australia on a tectonic time scale. Our indicators show that the climate was dry and that continental weathering and erosion were weak, with a small amount of terrestrial material transported to the ocean during the Early to Middle Miocene(22–12.7 Ma). However, as mentioned in previous studies of nearby sites, precipitation and river runoff increased prominently with enhanced continental weathering at 12.7–8 Ma, which was related to the northward migration or intensification of the westerlies, possibly due to increased sea ice in the Southern Ocean. In addition, we found that the evolution of the South Asian monsoon and the westerly belt were synchronized in the Miocene, which indicates that the South Asian monsoon system at that time may also have been affected by the high-latitude signals of the Southern Hemisphere. We speculate that the significant decrease in deep-sea temperature and the expansion of the surface sea temperature gradient in latitude and longitude until the permanent East Antarctic Ice Sheet fo

关键词： Miocene Southwest Australia Climate evolution Controlling factors International ocean discovery program

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Sea surface temperature evolution in the Yellow Sea Warm Current pathway and its teleconnection with high and low latitude forcing during the mid-late Holocene

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Journal of Oceanology and Limnology 2022年第1期40卷 93-109页

作者： Zhong PI fengming chang Tiegang LI Yikun CUI Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural Resources(MNR)Qingdao 266061China Laboratory for Marine Geology and Environment Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China School of Geography and Ocean Science Collaborative Innovation Center of South China Sea StudiesNanjing UniversityNanjing 210023China

Sea surface temperature(SST)in the Yellow Sea Warm Current(YSWC)pathway is sensitive to the East Asian Winter Monsoon(EAWM)and ***,the role of the YSWC in the evolution of regional SST remains ***,we present new U 37 k′based SST and grain size sequences spanning the last 6092 years in the sediment core Z1,which was retrieved from the central Yellow Sea muddy ***,U 37 k′-SST gradually increased since 6.1 ka BP,with a series of centennial-scale fl *** variation was mainly caused by EAWM when YSWC was weak between 6.1 and~3.9 ka BP,as shown by the end-member content of grain ***,after YSWC was fully developed,i.e.,since~3.9 ka BP,it exerted critical eff ects on SST evolution in its *** 1010-and 538-year cycles of the SST sequence indicated a basic control of solar activity on the oceanic conditions in the Yellow *** is suggested that the variation of total solar irradiance was amplifi ed by thermohaline circulation and then transmitted to the Yellow Sea through the ***,the tropical Pacifi c signal of El Niño was transmitted to the YSWC through the Kuroshio *** dual properties of warm water transported by YSWC to compensate the EAWM and driving by Kuroshio Current closely linked the variation of SST in the YSWC pathway to the Northern Hemisphere high latitude climate and the tropical Pacifi *** fi ndings highlight the signifi cance of YSWC on regional SST evolution and its teleconnection to high and low latitude forcing,which grains a better understanding of the long-term evolution of SST in the middle latitude Yellow Sea.

关键词： Yellow Sea Warm Current U 37 k′-SST East Asian Winter Monsoon Kuroshio Current high and low latitude forcing

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The evolution of the Kuroshio Current over the last 5 million years since the Pliocene: Evidence from planktonic foraminiferal faunas

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Science China Earth Sciences 2020年第11期63卷 1714-1729页

作者： Jia WANG fengming chang Tiegang LI Hanjie SUN Yikun CUI Tianhao LIU Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMNRQingdao 266061China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Meridional heat transport of the western Pacific boundary current(the Kuroshio Current)is one of the key factors in global climate *** current is important because it controls the temperature gradient between low latitudes and the North Pacific and so significantly influences mid-latitude atmosphere-ocean *** we reconstruct changes in hydrological conditions within the mid-latitude mainstream of the Kuroshio Current based on faunal analysis of planktonic foraminifera in core DSDP 296 from the Northwest Pacific *** approach enabled us to deduce evolutionary processes within the Kuroshio Current since the Pliocene.A total of 57 species in the coarser section(>150μm)were identified;results indicate that planktonic foraminiferal faunal evolution has mainly been characterized by three major stages,the first of which comprised mixed-layer warm-water species of Globigerinoides ruber which first appeared between 3.5 and 2.7 Ma and then gradually increased in *** of another warm-water species of *** also gradually increased in number over this *** in warm-water species indicate a gradual rise in sea surface temperature(SST)and imply initiation of Kuroshio Current impact on the Northwest Pacific Ocean since at least 3.5 ***,over the period between 2.7 and 2.0 Ma,thermocline species of Globigerina calida,Neogloboquadrina humersa,Neogloboquadrina dutertrei,and Pulleniatina obliquiloculata started to appear in the *** fauna was dominated by *** as well as increasing *** *** features imply a further rise in SST and its gradually enhanced influence on thermocline water,suggesting strengthening of the Kuroshio Current since 2.7 ***,between 2.0 Ma and present,increasing contents of thermocline species(i.e.,***,*** and ***)indicate a gradual rise in seawater temperature at this depth and also imply more intensive Kuroshio Current during th

关键词： Pliocene Kuroshio Planktonic foraminifera Western Pacific Warm Pool

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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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Palaeoenvironmental changes from pollen record in deep sea core PC-1 from northern Okinawa Trough,East China Sea during the past 24 ka

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Chinese Science Bulletin 2009年第20期54卷 3739-3748页

作者： XU HongYan chang fengming LUO YunLi SUN XiangJun State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China State Key Laboratory of Marine Geology Tongji University Shanghai 200092 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

A pollen record of core PC-1 from the northern Okinawa Trough,East China Sea(ECS),provides information on vegetation and climate changes since 24 ***.A total of 103 samples were palynologically analyzed at 8 cm intervals with a time resolution of 230 *** pollen zones are recognized:zone I(812―715 cm,24.2―21.1 ***),zone II(715―451 cm,21.1―15.2 ***),zone III(451―251 cm,15.2―10.8 ***),zone IV(251―0 cm,10.8―0.3 ***),corresponding to Late MIS 3,Last Glacial Maximum(LGM),deglaciation and Holocene,*** LGM is characterized by the dominance of herbs,mainly Artemisia,and high pollen influx,implying an open vegetation on the exposed continental shelf and a cool and dry *** deglaciation is a climate warming stage with Pinus percentage increased and Artemisia percentage decreased and a rapid sealevel *** Holo-cene is characterized by predominance of tree pollen with rapid increase in Castanea-Castanopsis in-dicating the development of mixed evergreen and deciduous broad-leaved forest and a warm,humid *** pollen influx during the Holocene probably implies submergence of the continental shelf and retreat of the pollen source *** vegetation indicated by pollen assemblage found in this upper zone is consistent with the present vegetation found in Kyushu,*** from the humid mountain area of North Luzon of the Philippines,Tasmania and New Zealand,Phyllocladus with sporadic occurrence throughout PC-1 core probably suggests the influence of Palaeo-Kuroshio Current or intense summer *** observed changes in Pinus and Herbs percentage indicate fluctuations of the sea level,and high Pinus percentage corresponds to high sea *** analysis of the pollen percentage record reveals many millennial-scale periodicities,such as periodicities of 6.8,3.8,2.2,1.6 ka.

关键词：冲绳海槽北部古环境变化东中国海 PC 深海花粉

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Vast laminated diatom mat deposits from the west low-latitude Pacific Ocean in the last glacial period

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Chinese Science Bulletin 2009年第23期54卷 4529-4533页

作者： ZHAI Bin LI TieGang chang fengming CAO QiYuan Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Diatoms are one of the predominant contributors to global carbon fixation by accounting for over 40% of total oceanic primary production and dominate export production. They play a significant role in marine biogeochemistry cycle. The diatom mat deposits are results of vast diatoms bloom. By analysis of diatom mats in 136°00′―140°00′E,15°00′―21°00′N, Eastern Philippines Sea, we identified the species of the diatoms as giant Ethmodiscus rex (Wallich) Hendey. AMS 14C dating shows that the sediments rich in diatom mats occurred during 16000―28600 a B.P., which means the bloom mainly occurred during the last glacial period, while there are no diatom mat deposits in other layers. Preliminary analysis indicates that Antarctic Intermediate Water (AAIW) expanded northward and brought silicate-rich water into the area, namely, silicon leakage processes caused the bloom of diatoms. In addition, the increase of iron input is one of the main reasons for the diatom bloom.

关键词：末次冰期硅藻藻垫存款太平洋低纬度生物地球化学循环层压

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Distribution, sources and burial fl ux of sedimentary organic matter in the East China Sea

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Journal of Oceanology and Limnology 2020年第5期38卷 1488-1501页

作者： WU Xiaodan WU Bin JIANG Mingyu chang fengming NAN Qingyun YU Xinke Saren Gaowa CAS Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Distribution of total organic carbon(TOC),total nitrogen(TN),stable isotope ratio of organic carbon and nitrogen(δ13 C andδ15 N)in 31 surface sediments were examined to quantitatively discriminate the source and burial of sedimentary organic matter(SOM)in the East China Sea(ECS).Results show that high content of TOC and TN occurred in the southern inner shelf and the northeast area due to the transport of organic matter(OM)from the changjiang(Yangtze)River southwards by the Zhejiang Fujian Coastal Current(ZFCC)and the delivery from the old Huanghe(Yellow)River estuary by the Subei Coastal Current(SbCC),*** signifi cant relationship of TOC to clay provided evidence that the fi ne-grained sediment was the primary carrier for SOM from the inner shelf to open *** TN varied proportionally to the TOC with the neglected intercept,suggesting that most of nitrogen measured was related to the SOM and the infl uence of the sorption of inorganic nitrogen was insignifi *** seaward enrichment ofδ13 C and seaward depletion of C/N andδ15 N illustrated the decrease of terrestrial OM(TOM)and the increase of marine OM(MOM).The close of average C/N ratio to the Redfi eld ratio indicated the minor role of terrestrial plant debris in the *** of bulk OM properties was ascribed to the terrestrial and marine input by the shelf circulation and phytoplankton with the contributions of 76.1%MOM and 23.9%TOM to SOM,*** burial fl ux of OC ranged within 0.34–7.56 mg/(cm 2∙a)(averaged 2.80 mg/(cm 2∙a))and enriched along the shore and in the fi ne-grained area,manifesting the signifi cant input of the land-based sources and the eff ect of shelf mud depositional process on the fate of *** sharp seaward decrease of burial fl uxes of terrestrial and marine OC gave evidences that the majority of organic carbon were settled in the inner shelf with the small fraction of them further transported eastwards.

关键词： distribution sedimentary organic matter sources burial East China Sea(ECS)

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Calcareous nannofossil bioevents and microtektite stratigraphy in the Western Philippine Sea during the Quaternary

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Chinese Science Bulletin 2011年第25期56卷 2732-2738页

作者： SUN HanJie LI TieGang SUN RongTao YU XinKe chang fengming TANG Zheng Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China School of Resource & Environment Engineering Shandong University of Technology Zibo 255049 China China Geological Survey Qingdao Institute of Marine Geology Qingdao 266007 China

Two sediment cores, MD06-3050 and MD06-3047, were analyzed to study the Quaternary calcareous nannofossil and microtektite records. We dated bioevents and the microtektite impact event by calibrating with oxygen isotope stratigraphy. Seven calcareous nannofossil bioevents were identified over the past 2.36 Ma including the last appearance of data for Discoaster brouweri, Calcidiscus macintyrei, large Gephyrocapsa and Pseudoemiliania lacunosa, the first appearance of data for large Gephyrocapsa and Emiliania huxleyi, and the abrupt increase in the abundance of Gephyrocapsa caribbeanica. In addition, we fortunately observed that Australasian microtektites were distributed in core MD06-3050 from 1340 to 1374 cm.

关键词：钙质超微化石同位素地层学第四纪菲律宾海西方沉积物岩心撞击事件

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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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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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