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Geoscience Frontiers 2024年第1期15卷 304-324页

作者： Martina Busetti Riccardo Geletti Dario Civile Chiara Sauli Giuseppe Brancatelli Edy Forlin Daniela Accettella Lorenza Barro Savonuzzi Laura De Santis Aldo Vesnaver Andrea Cova National Institute of Oceanography and Applied Geophysics–OGS Borgo Grotta Gigante 42/c34010 SgonicoTriesteItaly

seafloor and buried reliefs occur along continental margin of the ross sea(Antarctica).These features are several kilometres wide and tens of metres high,exhibiting cone or flat-top dome *** studies have proposed a volcanic or glacial origin for these formations,but these hypotheses do not account for all the available *** this study,we use morpho-bathymetric data,intermediate resolution multichannel seismic and high resolution chirp profiles,as well as magnetic lines to investigate these clusters of *** employing targeted processing techniques to enhance the geophysical characterization of the seafloor and buried reliefs,and to understand the underlying geological features,we propose that the reliefs are mud *** of these formations appear to be associated with a plumbing system,as indicated by acoustic anomalies linked to sediment containing *** formations are likely fed by clayey source rocks of Miocene ***,other reliefs might be the result of mud mobilisation caused by gravity instability and fluid overpressure.

关键词： ross sea Antarctica Mud volcanoes Gas plumbing system Gas hydrate Bottom Simulating Reflector

Horizontal distribution of tintinnids(Ciliophora)in surface waters of the ross sea and polynya in the Amundsen sea(Antarctica)during summer 2019/2020

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Advances in Polar Science 2022年第1期33卷 28-43页

作者： WANG Chaofeng XU Zhiqiang LI Haibo WANG Yongqiang ZHANG Wuchang CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Jiaozhou Bay Marine Ecosystem Research Station Institute of OceanologyChinese Academy of SciencesQingdao 266071China Marine Biological Museum Institute of OceanologyChinese Academy of SciencesQingdao 266071China

Information on tintinnid horizontal distribution in the Antarctic Continental Zone is *** the summer of 2019/2020,tintinnid diversity and horizontal distribution in surface waters were investigated in the ross sea and Amundsen sea *** tintinnid species were found and the dominant species showed obvious horizontal distribution *** the ross sea,three tintinnid community groups were *** cristallina and Laackmanniella prolongata(group I)were dominant species and were mainly distributed in stations closer to the coast than were species in the other two *** gaussi(group II)and ***(group III)were mainly distributed in nearshore and offshore stations,*** the Amundsen sea polynya,the dominant species ***,*** and Salpingella faurei(group I)were mainly distributed in stations closer to the coast than were species in the other two ***(group III)was mainly distributed in offshore *** distribution area where *** and *** were found in high abundance and abundance proportion of loricae with protoplasts was divided by the approximate boundary of the Antarctic Slope Front Current and Coastal Current in the ross *** highest abundance proportion in the ross sea was the 32-36μm lorica oral diameter(LOD)size class(75.7%),and the 36-40μm LOD size class(56.0%)was found in the Amundsen sea ***-salinity-plankton diagrams of the two seas revealed that temperature may be the main reason for species *** results contribute to a better understanding of horizontal distribution of the microbial food web,and serve as a baseline for future studies of pelagic community change in the Antarctic Continental Zone.

关键词： Antarctic Continental Zone tintinnid community structure ross sea Amundsen sea polynya

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

The importance of long-term research and monitoring in the ross sea

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Advances in Polar Science 2019年第4期30卷 359-361页

作者： Bob ZUUR 机构不祥

The ross sea region is a biologically rich and dynamic environment and,although protected under various instruments of the Antarctic Treaty System,is threatened by a changing climate and increasing human activities locally and *** opinion editorial describes the importance of research and monitoring in the ross sea and identifies opportunities and barriers to enhance them.

关键词： ross sea human impacts toothfish fishery environmental models CCAMLR Ecosystem MonitoringProgram (CEMP) Marine Protected Areas (MPAs)

Sources of organic matter and paleo-environmental implications inferred from carbon isotope compositions of lacustrine sediments at Inexpressible Island, ross sea, Antarctica

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Advances in Polar Science 2016年第4期27卷 233-244页

作者： WEI Yangyang JIN Jing NIE Yaguang CHEN Xin WU Libin FU Pingqing LIU Xiaodong Steven D.Emslie Institute of Polar Environment School of Earth and Space Sciences University of Science and Technology of China Key Laboratory of Ion Beam Bioengineering Hefei Institutes of Physical Science Chinese Academy of SciencesKey Laboratory of Environmental Toxicology and Pollution Control Technology of Anhui Province LAPC Institute of Atmospheric Physics Chinese Academy of Sciences Department of Biology and Marine Biology University of North Carolina Wilmington

The carbon isotopic composition of organic matter （δ^13Corg） was determined in two sediment cores （IIL1 and IIL9） recovered from Inexpressible Island, ross sea, Antarctica, and analyzed to identify the sources of that organic matter. The δ^13Corg values of sediments of IIL9 were found to vary between -14.6‰ and -11.6‰, with a mean of-13.4‰ （n=48）. These values were significantly higher than those of IIL1 sediments which varied between -23.2‰ and -20.4‰, with a mean of-21.8%o （n=55）. The variation in δ^13Corg values in these two sediment cores indicate different sources of organic matter, The relatively high 6~3Corg values in IIL9 are in accordance with a source from algae, while the low δ^13Corg values in IIL1 evince significant influence from penguin guano with algae as the secondary source. Compared with the reference data from other high-latitude lake sediments and plants, the δ^13Corg values in IIL9 were extremely high, a result likely related to intense competition for CO2 assimilation among algal species during the growing season in this relatively shallow pond. These results indicate that sedimentary δ^13Corg is a reliable proxy for paleo-primary productivity in ponds at Inexpressible Island.

关键词： Inexpressible Island ross sea pond sediments lake algae carbon isotopic composition paleo-environment

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

Characteristics of Antarctic aerosol composition during the Australian fires of 2019-2020

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Advances in Polar Science 2024年第4期35卷 421-437页

作者： CHEN Afeng WANG Longquan LIU Hongwei YUE Fange XIE Zhouqing Institute of Polar Environment&Anhui Key Laboratory of Polar Environment and Global Change Department of Environmental Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China Engineering and Technological Research Centre of National Disaster Relief Equipment Army Logistics AcademyChongqing 401331China State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China

During the 36th Chinese National Antarctic Research Expedition,aerosol samples were gathered from the ross sea in Antarctic to assess the climatic impact of the Australian fires that occurred in *** chemical compositions,including levoglucosan(Lev)and its isomers,galactosan(Gan)and mannosan(Man),were *** component analysis helped identify the potential sources of these chemical *** combining backward trajectories with the ratios of CLev/CMan and CMan/CGan,it was further inferred that Australia might be the potential source region for biomass *** radiative forcing resulting from biomass burning was evaluated using the Santa Barbara DISORT Atmospheric Radiative Transfer(SBDART)model,which revealed that black carbon emitted from biomass burning could slightly warm the atmosphere(+0.52 W·m^(-2))while causing slightly cooling at the surface(-0.73 W·m^(-2))and the top of the atmosphere(-0.22 W·m^(-2))over the ross sea.

关键词： Australian fires biomass burning aerosol composition climate effect ross sea

Progress in Antarctic marine geophysical research by the Chinese Polar Program

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Advances in Polar Science 2017年第4期28卷 256-267页

作者： GAO Jinyao SHEN Zhongyan YANG Chunguo WANG Wei JI Fei WU Zhaocai NIU Xiongwei DING Weifeng LI Dongxu ZHANG Qiao Key Laboratory of Submarine Geosciences State Oeanic Administration (SOA) Second Institute of Oceanography SOA Department of Earth Sciences Zhejiang University Chinese Antarctic Center of Surveying and Mapping Wuhan University

Marine geophysical survey by the Chinese National Antarctic Research Expedition （CHINARE） began with the first science expedition in 1984/1985, although only four cruises were performed in the vicinity of the Antarctic Peninsula between then and 1991/1992. After a 20 year hiatus, Antarctic marine geophysical research was relaunched by the Chinese Polar Environmental Comprehensive Investigation and Assessment Programs （known simply as the Chinese Polar Program） in 2011/2012. Integrated geophysical surveys have been carried out annually since, in Prydz Bay and the ross sea. During the last 5 years, we have acquired about 5500 km of bathymetric, gravimetric, and magnetic lines; more than 1800 km of seismic reflection lines; and data from several heat flow and Ocean Bottom Seismometer （OBS） stations. This work has deepened understandings of geophysical features and their implications for geological tectonics and glacial history in Antarctica and its surrounding seas. Compiled Antarctic Bouguer and Airy isostatic gravity anomalies show different features of tectonics between the East Antarctic stability and West Antarctic activity. Calculated magnetic anomalies, heat flow anomalies and lithospheric anisotropy offshore of Prydz Bay may imply high heat capacity of mantle shielded by the continental shelf lithosphere, but high heat dissipation of mantle due to the Cretaceous breakup of Gondwana along the continent and ocean transition （COT）, where large sediment ridges would be brought about by the Oligocene ice sheet retreat and would enlarge free-air gravity anomalies. In the western ross sea, CHINARE seismic profiles indicate northern termination of the Terror Rift and deposition time of the grounding zone wedge in the northern JOIDES Basin.

关键词： marine geophysics Chinese Polar Program Antarctica gravity magnetics seismic strata Prydz Bay ross sea