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Acta Oceanologica Sinica 2018年第10期37卷 64-69页

作者： LEI Yanli li tiegang Department of Marine Organism Taxonomy and Phylogeny Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Marine Sedimentology and Environmental Geology the First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266061 China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China

Foraminiferal oozes were sampled from the tropical West Pacific seamount and seabed of deep sea, by a remotely operated vehicle （ROV） in December 2014 and March 2016. Using standard morphological method, four Miliolinella species, including Miliolinella obesa, M. circularis, M. suborbicularis and M. subrotunda were described. Among the four species, M. obesa is a new species. It is a large member （about 500 μm in length） of the genus. This species is characterized by having a very stout and transverse broadly circular outline, and its body width is greater than the body length. In addition, its chamber demarcations are obscure from the exterior appearance. Three chambers are unclearly visible on one side and two chambers are visible on the opposite. Finally, we provided very detailed taxonomic microphotographs and the ecological distribution information for each species.

关键词： deep sea foraminifera Miliolinella seamount seabed West Pacific Ocean

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

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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

Responses of benthic foraminifera to changes of temperature and salinity:Results from a laboratory culture experiment

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Science China Earth Sciences 2019年第2期62卷 459-472页

作者： Shuaishuai DONG Yanli LEI tiegang li Zhimin JIAN Department of Marine Organism Taxonomy & Phylogeny Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences Center for Ocean Mega-Science Chinese Academy of Sciences Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography SOA Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology State Key Laboratory of Marine Geology Tongji University

The effects of temperature and salinity on intertidal foraminiferal community under laboratory conditions are poorly understood. We designed a two-factor crossed experiment in which foraminiferal communities were cultured at different temperatures (6, 12, and 18℃) and salinities (15, 20, 25, and 30 psu) for 10 weeks. In total, 2616 living (stained) specimens were obtained and analyzed. Foraminiferal abundance ranged from 9 to 202 individuals/10 g wet weight of sediment. The highest abundance was obtained at 12℃, 25 psu and the lowest at 6℃, 15 psu. Statistical results demonstrated that temperature affected foraminiferal community more significantly than salinity. Most foraminiferal community parameters (abundance, species richness, Margalef index, and Shannon-Wiener diversity) were significantly positively correlated to temperature, but not to salinity, whereas Pielou's evenness was significantly negatively correlated to both temperature and salinity. The interactive effect of temperature and salinity on foraminiferal abundance was significant. In addition, with increasing temperature, the species composition shifted from hyaline Rotaliida to porcellaneous Miliolida. The abundance of dominant species (e.g., Ammonia aomoriensis, A. beccarii, and Quinqueloculina seminula) showed significant positive correlations to temperature. Our study indicated that the intertidal foraminiferal community responds sensitively and rapidly to the changes of salinity and, especially,temperature by shifting foraminiferal species composition and altering the community parameters.

关键词： Benthic foraminifera Community parameter Temperature Salinity Culture experiment Intertidal zone

Changing structure of benthic foraminiferal communities due to declining pH:Results from laboratory culture experiments

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Science China Earth Sciences 2019年第7期62卷 1151-1166页

作者： Shuaishuai DONG Yanli LEI tiegang li Zhimin JIAN Laboratory of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMNR.Qingdao 266061China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Laboratoiy for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266061China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

The ocean absorbs large amounts of CO_2 emitted from human activities, which results in a decrease in seawater p *** calcifying organisms such as foraminifera, are most likely to be affected by this declining pH. In this study, we collected sediments from five stations of different depths(34–73 m) in a continental shelf of the Yellow Sea. The entire benthic foraminiferal communities together with sea sediments were cultured under three constant pHs(8.3, 7.8, and 7.3) for 6 and 12 weeks in the laboratory to study their responses to pH or incubation time. The microcosm's experimental results obtained showed that most of the foraminiferal community parameters(abundance, species richness, Margalef index, and Shannon-Wiener diversity) decreased significantly(pline in pH in all the tested stations. The responses of foraminifera to the decline in p H were species-specific, for instance, Protelphidium tuberculatum and Cribroelphidiumfrigidum were highly sensitive to declining pH and were finally eliminated at low pH, while some species(e.g., Lagenammina atlantica, Verneuilinulla advena, V. propinqua, Haplophragmoides applanata, and H. canariensis) could tolerate low pH and acted as pH-tolerant species. In addition, the proportion of hyaline taxa showed a significant(plined after 6 weeks' incubation under low p H manipulation. Our results indicated that nearshore foraminiferal communities showed rather a resilience to the declining p H and the offshore foraminifera, especially those in the central area of the Yellow Sea Cold Water Mass were found to be more sensitive to the decline in pH in the continental shelf sediments of the Yellow Sea.

关键词： Benthic foraminifera Community pH Laboratory culture experiment Yellow Sea

NGS-metabarcoding revealing novel foraminiferal diversity in the Western Pacific Magellan Seamount sediments

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Journal of Oceanology and limnology 2021年第5期39卷 1718-1729页

作者： Junfeng SHI Yanli LEI Haotian li tiegang li Laboratory of Marine Organism Taxonomy and Phylogeny 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 Clinical Research Center Affi liated Hospital of Weifang Medical UniversityWeifang 261031China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Seamount is a unique deep-sea ecosystem widely distributed in the *** biodiversity is vibrant due to its specific geographical and hydrological ***,the diversity and features of foraminifera in such an environment have rarely been *** extracted environmental DNA(eDNA)in sedime nts and amplified the partial small subunit ribo somal DNA(SSU rDNA)of fo raminife ra to understand the foraminiferal diversity from four sites in Magellan Seamount(Western Pacific Ocean).Partial S SU rDNA sequencing was conducted and 912979 foraminiferal reads were obtained and gathered into 266 operational taxonomic units(OTUs).In the available dataset,a high proportion of rare OTUs and low identity OTUs in each studied sample showed that the Magellan Seamount foraminiferal community might have a high genetic *** relative abundance of foraminifera varied between replicates probably due to the existence of bias in amplification process and patchiness of the deep-sea *** showed that the Magellan Seamount has a relatively high benthic foraminiferal diversity characterized mainly by monothalamiids(76.37%of total reads)in association with rotaliids(19.03%of total reads),including planktic foraminiferal sequences(38.58%of rotaliids;7.36%of total reads).The remaining reads were assigned to miliolids(0.83%of total reads)and textulariids(0.66%of total reads),and 3.11%of total reads are unassigned to a specific *** co mparative analysis with foraminiferal assemblage s from coastal and deep-sea environme nts indicated that seamounts could aggregate species from a nearby deep-sea.

关键词： metabarcoding Magellan Seamount foraminifera Western Pacific Ocean

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

Quantitatively distinguishing sediments from the Yangtze River and the Yellow River using δEu_N-ΣREEs plot

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Science China Earth Sciences 2009年第2期52卷 232-241页

作者： JIANG FuQing ZHOU XiaoJing li AnChun li tiegang Key laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Graduate University Chinese Academy of SciencesBeijing 100049China

Sediment samples were collected from the lower channel of the Yangtze River and the Yellow River and the contents of rare earth elements (REEs) were measured. In addition, some historical REEs data were collected from published literatures. Based on the δEuN-ΣREEs plot, a clear boundary was found be-tween the sediments from the two rivers. The boundary can be described as an orthogonal polynomial equation by ordinary linear regression with sediments from the Yangtze River located above the curve and sediments from the Yellow River located below the curve. To validate this method, the REEs con-tents of sediments collected from the estuaries of the Yangtze River and the Yellow River were meas-ured. In addition, the REEs data of sediment Core 255 from the Yangtze River and Core YA01 from the Yellow River were collected. Results show that the samples from the Yangtze River estuary and Core 255 almost are above the curve and most samples from the Yellow River estuary and Core YA01 are below the curve in the δEuN-ΣREEs plot. The plot and the regression equation can be used to distin-guish sediments from the Yangtze River and the Yellow River intuitively and quantitatively, and to trace the sediment provenance of the eastern seas of China. The difference between the sediments from two rivers in the δEuN-ΣREEs plot is caused by different mineral compositions and regional climate patterns of the source areas. The relationship between δEuN and ΣREEs is changed little during the transport from the source area to the river, and from river to the sea. Thus the original information on mineral compositions and climate of the source area was preserved.

关键词： sediment provenance Yangtze River Yellow River δEuN-ΣREEs plot

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

Relative paleointensity of the geomagnetic field during the past 200 ka from the West Philippine Sea and its chronological significance

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Science China Earth Sciences 2009年第8期52卷 1115-1126页

作者： QingYong Meng AnChun li tiegang li FuQing Jiang XiaoJing Zhou Key Lab of Marine Geology & Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

Our rock magnetic analysis of core Ph05 from the West Philippine Sea demonstrates that the core preserves a strong, stable remanent magnetization and meets the magnetic mineral criteria for relative paleointensity (RP... 详细信息

关键词： West Philippine Sea relative paleointensity geomagnetic field

Late Holocene paleoenvironmental changes in the southern Okinawa Trough inferred from a diatom record

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Chinese Science Bulletin 2011年第11期56卷 1131-1138页

作者： li Dongling JIANG Hui li tiegang ZHAO MeiXun Key Laboratory of Geographic Information Science East China Normal University Shanghai 200062 China Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Theoretical and Applied Marine Chemistry and Chemical Engineering of the Ministry of Education Ocean University of China Qingdao 266100 China

We analyzed sediment diatoms from core MD05-2908 to infer climate and paleoenvironmental changes in the southern Okinawa Trough (SOT) over the past 1000 *** the study area is located in the East Asia monsoon area and beneath the main axis of Kuroshio Current,the climatic and hydrographical conditions are strongly influenced by both of these *** species used as environmental indicators,including the Kuroshio Current species (KC species) and freshwater species,were investigated in this *** in the abundance of the two groups of species revealed significant variations in water temperature and hydrography in the SOT during the Medieval Warm Period (MWP) and the little Ice Age (liA).From 950-1500 AD,the abundance of the KC species increased fluctuantly,while the freshwater species decreased,showing that the influence of the Kuroshio Current was intensified at that interval and the precipitation of the study area was relatively *** KC species decreased remarkably and was maintained at a low abundance during the interval of 1500-1900 AD,which suggests that the impact of the Kuroshio Current on the SOT weakened during the period corresponding to the ***,the high abundance of the freshwater species at the same interval indicates a distinct increase in precipitation in northeastern Taiwan,which may be correlated to the south-detention of the rainfall belt in China caused by the southward migration of the western Pacific subtropical high.

关键词：古环境变化冲绳海槽沉积硅藻晚全新世西太平洋副热带高压物种丰度时间间隔东亚季风区