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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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冰期旋回中热带西太平洋碳源汇过程、机理与效应

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科学通报 2024年第13期69卷 1742-1758页

作者：李铁刚熊志方秦秉斌贾奇郭景腾自然资源部第一海洋研究所海洋地质与成矿作用重点实验室青岛266061 崂山实验室海洋地质过程与环境功能实验室青岛266237

冰期旋回是第四纪地球气候变化最显著的特征,热带西太平洋通过水文循环控制全球气候演化,这是“气候演变低纬驱动”理论的核心内容.由于现代热带西太平洋CO_(2)总体上处于海-气平衡,因此基于“将今论古”的思想,长期以来学术界认为热带... 详细信息

冰期旋回是第四纪地球气候变化最显著的特征,热带西太平洋通过水文循环控制全球气候演化,这是“气候演变低纬驱动”理论的核心内容.由于现代热带西太平洋CO_(2)总体上处于海-气平衡,因此基于“将今论古”的思想,长期以来学术界认为热带西太平洋相对于南大洋等高纬海区在大气CO_(2)分压(pCO_(2))冰期旋回中的作用并没那么重要,从而低估了热带西太平洋通过碳源汇演替调控全球气候的作用.在综合分析上新世以来冰期旋回中热带西太平洋碳源汇过程与机制的基础上,总结出了其气候效应模式,发现冰期时海平面降低导致更多的河流营养物进入海洋,致使近海表层有机碳生产和海底有机碳埋藏加强;同时,远洋为了“补偿”陆架珊瑚礁等钙质生物碳酸盐生产的减少,引起其深部CO32和碱度增加,致使远洋深部碳库增强;另外,开放洋区大型硅藻勃发等有机碳生产演化事件在大洋深部形成呼吸碳库,进一步“放大”了上述增强的深部碳库.这些碳循环过程表明冰期热带西太平洋扮演碳汇角色.间冰期时上述碳循环过程发生的方向或强度与冰期相反,但目前还没有证据证明间冰期热带西太平洋是否扮演碳源角色;尽管冰消期,其确实能向大气释放CO_(2).此外,叠加在冰期旋回之上的长尺度记录以及跨越冰期旋回的重大事件记录均显示,热带西太平洋可以通过全球的遥相关或洋际交换,在深部“被动”形成碳库.但这种“被动”形成的深部碳库是否也发生在冰期旋回中还有待于进一步证实.总之,热带西太平洋碳循环也同水文循环一样,通过碳源汇演替对冰期旋回中大气pCO_(2)和全球气候产生重要影响,从而丰富了“气候演变低纬驱动”理论的内涵.

关键词：表层海洋固碳深部海洋储碳海平面风尘碳循环上新世以来

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Morphology of four Miliolinella species (Foraminifera, Protozoa) with description of a new species, Miliolinella obesa nov. spec., from the tropical West Pacific Ocean

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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

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Paleoproductivity variations in the southern Okinawa Trough since the middle Holocene:Calcareous nannofossil records

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Chinese Science Bulletin 2012年第26期57卷 3917-3922页

作者： ZHAO JingTao li tiegang li Jun HU BangQi Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Hydrocarbon Resource and Geology Ministry of Land and ResourcesQingdao Institute of Marine GeologyQingdao 266071China Key Laboratory of Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China

Based on 17 AMS 14 C age data,we reconstructed high-resolution records of sea surface primary productivity(PP) in the southern Okinawa Trough(MD05-2908) over the last 6.8 ka BP using the calcareous nannofossil carbon isotope and the relative percentage contents of Florisphaera profunda *** underlying mechanism controlling the sea surface PP was then *** sea surface PP,indicated by the coccolith δ 13 C and %Fp conversional equations,decreased with some fluctuations since 6.8 ka *** decrease may be connected to the decreased terrigenous input resulting from the reduced East Asian Summer Monsoon(EASM) *** the periods of 4-2 ka BP(PME) and 6.8-4.8 ka BP were characterized by relatively higher *** former was mainly controlled by the weakening of the Kuroshio Current,whereas the latter mainly resulted from the greater terrigenous input associated with the stronger EASM.

关键词：钙质超微化石冲绳海槽古生产力化石记录中全新世东亚夏季风高分辨率记录陆源物质

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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

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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

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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

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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

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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

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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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