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The Role of ocean Dynamics in the Cross-equatorial Energy Transport under a Thermal Forcing in the southern ocean

Advances in Atmospheric Sciences 2021年第10期38卷 1737-1749页

作者： Fukai LIU Yiyong LUO Jian LU Xiuquan WAN Frontier Science Center for Deep ocean Multispheres and Earth System(FDOMES)and Physical oceanography Laboratory Ocean University of ChinaQingdao 266100China Laboratory for ocean Dynamics and Climate Qingdao Pilot National Laboratory for Marine Science and TechnologyQingdao 266100China College of oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Atmospheric Sciences and Global Change Division Pacific Northwest National LaboratoryRichlandWA 99352USA

Under external heating forcing in the southern ocean,climate models project anomalous northward atmosphere heat transport(AHT)across the equator,accompanied by a southward shift of the intertropical convergence zone(ITCZ).Comparison between a fully coupled and a slab ocean model shows that the inclusion of active ocean dynamics tends to partition the cross-equatorial energy transport and significantly reduce the ITCZ shift response by a factor of 10,a finding which supports previous *** understand how ocean dynamics damps the ITCZ’s response to an imposed thermal heating in the southern ocean,we examine the ocean heat transport(OHT)and ocean circulation responses in a set of fully coupled *** show that both the Indo-Pacific and the Atlantic contribute to transport energy across the equator mainly through its Eulerian-mean ***,different from previous studies that linked the changes in OHT to the changes in the wind-driven subtropical cells or the Atlantic meridional overturning circulation(AMOC),our results show that the cross-equatorial OHT anomaly is due to a broad clockwise overturning circulation anomaly below the subtropical cells(approximately bounded by the 5°C to 20°C isotherms and 50°S to 10°N).Further elimination of the wind-driven component,conducted by prescribing the climatological wind stress in the southern ocean heat perturbation experiments,leads to little change in OHT,suggesting that the OHT response is predominantly thermohaline-driven by air-sea thermal interactions.

关键词： southern ocean ocean dynamics atmospheric energy transport oceanic energy transport

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Phylogenetic analysis and biological characteristic tests of marine bacteria isolated from southern ocean(Indian sector)water

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Acta oceanologica Sinica 2015年第8期34卷 73-82页

作者： GUPTA Pratibha BALAJI Raju PARANI M CHANDRA T S SHUKLA P KUMAR Anil BANDOPADHYAY Rajib Department of Bio-Engineering Birla Institute of Technology Department of Genetic Engineering Kattankulathur Campus SRM University Microbiology and Genetics Laboratory Department of Biotechnology Indian Institute of Technology Madras Department of Microbiology Maharshi Dayanand University OSSG Department National Centre for Antarctic and Ocean Research Ministry of Earth Sciences Government of India UGC Centre of Advanced Study Department of Botany the University of Burdwan

Fifty-seven bacteria were isolated from southern ocean （Indian sector） water samples which were collected from different latitude and longitude of the ocean. All the isolates were able to grow at 4℃, 20℃, 37℃ and tolerable NaCI concentration up to 13.5% （w/v）. 29 out of 57 isolates were identified using 16S rDNA amplification and the sequences were submitted to National Center for Biotechnology Information （NCBI）. All the isolates were classified by using Ribosomal Database Project （RDP） and found that isolates belongs to Proteobacteria and Bacteriodes. The average G＋C content was 56.4%. The isolates were screened for the presence of extracellular enzymes, viz. amylase, catalase, urease, esterase, lipase and protease. The disc diffusion method is used to screen antibiotic production by the isolates against four pathogenic bacteria, viz. Salmonella typhimurium （NCIM 2501）, Staphylococcus aureus （NCIM 2122）, Bacillus subtilis （NCIM 2193）, and Pseudomonas aeruginosa （NCIM 2036）. Nine out of 29 were found to be antibiotic producer.

关键词： southern ocean marine bacteria 16S rDNA phylogenetic tree antibacterial

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Secondary Calcification of Planktic Foraminifera from the Indian Sector of southern ocean

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 27-37页

作者： Rahul MOHAN Suhas S.SHETYE Manish TIWARI Narayanpillai ANILKUMAR National Centre for Antarctic and ocean Research National Institute of oceanography

This study focused on planktic foraminifera in plankton tows and surface sediments from the western Indian sector of southern ocean in order to evaluate the potential foraminiferal secondary calcification and/or dissolution in the sediment. It is found that the symbiotic foraminiferal species are abundant in the subtropical region, whereas non-symbiotic species dominate in the sub-Antarctic and polar frontal regions. The distribution of the symbiotic and non-symbiotic foraminiferal species is controlled by temperature, salinity, light, nutrients and phytoplankton biomass. There is also a lateral southern extent in abundance of planktic foraminifera from surface sediments to plankton tows. The shell weights of the planktic foraminifera N. pachyderma, G. bulloides and G. ruber within the surface sediments are on an average heavier by 27%, 34% and 40% respectively than shells of the same size within the plankton tows, indicative of secondary calcification. The planktic foraminiferal isotopes show the presence of heavier isotopes in the surface sediment foraminifera as compared to plankton tows, thus confirming secondary calcification. Secondary calcification in G. ruber occurs in the euphotic zone, whereas in case of N. pachyderma and G. builoides it is at deeper depths. We also observed a decrease in the shell spines in surface sediment foraminifera as compared to plankton tows, indicative of the morphological changes that foraminifera underwent during gametogenesis.

关键词： southern ocean foraminifera climate change stable isotopes shell weight

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The investigation on particulate organic carbon fluxes with disequilibria between thorium-234 and uranium-238 in the Prydz Bay,the southern ocean

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Acta oceanologica Sinica 2008年第2期27卷 21-29页

作者： HE Jianhua MA Hao CHEN Liqi XIANG Baoqiang ZENG Xianzhang YINMingduan ZENG Wenyi Key Laboratory of Global Change and Marine - Atmospheric Chemistry Third Institute of Oceanography State OceanicAdministration（SOA） Xiamen 361005 China Third Institute of oceanography SOA Xiamen 361005 China Department of Engineering Physics Tsinghua University Beijing 100084 China Key Laboratory of Marine Science and Numerical Modeling First Institute of Oceanography SOA Qingdao 266061 China

Dissolved and particulate thorium-234, particulate organic carbon in the upper 150 m of water columns from five stations in the Prydz Bay, the southern ocean were determined during the 22nd Chinese National Antarctic Research Expedition （from November 2005 to March 2006 ）. The disequilibria between thorium-234 and its parent uranium-238 in upper layer was used to derive the averaged residence time of thorium-234, which decreased along with the latitude to the south and a minimum value, 1 - 8 d for particulate thorium-234 and 29 - 48 d for dissolved thorium-234, appeared at the medium latitude station, and the export fluxes of thorium-234 were calculated too and ＇a maximum value, 0. 35 -0. 63 Bq/（m^3 · d） for the particulate thorium-234 and 0. 44 -0. 65 Bq/ （m^3 ·d） for the dissolved thorium-234, appeared at the same station. The export fluxes of particulate organic carbon at different water columns were derived by two methods with irreversible scavenging model, and the averaged values were 104. 7 mmol/ （ m2 · d ）（ E method） and 120. 6 mmol/（ m2·d ）（ B method ）, respectively, indicating that a relatively high new production would exist in summer in the Prydz Bay where it will play a potential significant role in sequestering the absorption CO2 to deeper ocean.

关键词： POC fluxes disequilibria between thorium-234 and uranium-238 Prydz Bay southern ocean

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Comparison of airsea fluxes of CO_(2) in the southern ocean and the western Arctic ocean

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Acta oceanologica Sinica 2004年第4期23卷 647-653页

作者： GAOZhongyong YANGXulin WANGWeiqiang KeyLaboratoryofGlobalChangeandMarine-AanosphericChemistry StateOceanicAdministrationXiamen361005China／／ThirdInstituteofOceanographyStateOceanicAdministrationXiamen361005China ThirdInstituteofoceanography StateOceanicAdministrationXiamen361005China

The data were collected during Chinese Arctic and Antarctic Expeditions in the western Arctic ocean and themarginal sea ice zone (MSIZ) of the southern ocean, respectively in the boreal summer from July to September of1999 and in the austral summer from December of 1999 to January of 2000. The concentrations of CO2 in surfacewater of the survey regions would mostly present lower than those in the atmosphere. A significant biologicaldriving force could also been observed in summer waters in both of the above oceans. Air to sea CO2 fluxes were alsocalculated to compare oceanic uptake capacity of CO2 in both oceans with the world oceans using Liss, Wanninkhof,and Jacobss methods. The averaged CO2 fluxes of air to sea in the western Arctic ocean or in the MSIZ of thesouthern ocean doubled that in the world oceans.

关键词： CO2 airsea exchange global change southern ocean western Arctic ocean

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Dynamics of seasonal and interannual variability of the ocean bottom pressure in the southern ocean

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Acta oceanologica Sinica 2022年第5期41卷 78-89页

作者： Xiaoqin Xiong Xuhua Cheng Niansen Ou Tao Feng Jianhuang Qin Xiao Chen Rui Xin Huang College of oceanography Hohai UniversityNanjing210024China southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519080China College of ocean and Meteorology Guangdong Ocean UniversityZhanjiang524088China Woods Hole oceanographic Institution FalmouthWoods HoleMA02543USA

Seasonal and interannual variability of ocean bottom pressure(OBP)in the southern ocean was investigated using Gravity Recovery and Climate Experiment(GRACE)data and a Pressure Coordinate ocean Model(PCOM)based on mass *** comparing OBP,steric sea level,and sea level,it is found that at high latitudes the OBP variability dominates the sea level variability at seasonal-to-decadal time *** diagnostic OBP based on barotropic vorticity equation has a good correlation with the observations,indicating that wind forcing plays an important role in the variability of the OBP in the southern *** unique interannual patterns of OBP in the southern ocean are closely associated with El Niño-southern Oscillation(ENSO)and southern Annular Mode(SAM).Regression analysis indicates that ENSO and SAM influence the OBP through altering the Ekman transport driven by surface *** leading pattern of OBP from PCOM are very similar to *** experiments of PCOM show that surface wind forcing explains the observed OBP variability quite well,confirming the importance of wind forcing and related oceanic *** the eastern South Pacific,the averaged OBP shows a decrease(increase)trend before(after)2011,reflecting the reverse trend in westerly *** the South Indo-Atlantic ocean,the averaged OBP has a weak increase trend during 2003–2016.

关键词： ocean bottom pressure southern ocean interannual variability PCOM

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Eddy properties in the Pacific sector of the southern ocean from satellite altimetry data

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Acta oceanologica Sinica 2016年第11期35卷 28-34页

作者： DUAN Yongliang LIU Hongwei YU Weidong HOU Yijun Center for ocean and Climate Research The First Institute of Oceanography State Oceanic Administration Laboratory for Regional oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology Key Laboratory of ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences

Mesoscale eddies play a key role in the ocean dynamics of the southern ocean, and eddy response to the climate changes has also been widely noted. Both eddy kinetic energy（EKE） and eddy detection algorithm are used to study the eddy properties in the Pacific sector of the southern ocean. Consistent with previous works,the maps of the EKE illustrate that higher energy confines to the Antarctic Polar Frontal Zone（APFZ） and decreases progressively from west to east. It also shows that the most significant increase in the EKE occurs in the western and central parts of the Pacific sector, where the baroclinicity of the Antarctic Circumpolar Current（ACC） is much stronger. Statistical eddy properties reveal that both of the spatial pattern and interannual variation of the EKE are primarily due to the eddy amplitude and the eddy rotational speed, rather than the eddy number or the eddy radius. In general, these results furtherly confirm that anomalous westerly wind forcing associated with the positive southern Annular Mode（SAM） index enhances the southern ocean eddy activity by strengthening the eddy properties.

关键词： eddy property eddy kinetic energy southern ocean satellite altimeter

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Spatial distribution of aloricate ciliates in the stratified water of the Cosmonaut and Cooperation Seas in the southern ocean

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Advances in Polar Science 2022年第4期33卷 313-325页

作者： LI Jingyuan LI Haibo WANG Chaofeng ZHANG Wuchang XIAO Tian 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 University of Chinese Academy of Sciences Beijing 100049China

Aloricate ciliates are the main component of *** play important roles in the circulation of materials and flow of energy in marine pelagic *** determine the distribution pattern and structure of the aloricate ciliate community in vertically stratified waters of the southern ocean,we collected data on aloricate ciliates in the Cosmonaut and Cooperation Seas during the 36th Chinese National Antarctic Research *** ranges of aloricate ciliate abundance and biomass were 5-3097 ind·L^(-1)and 0.01-11.40μg C·L^(-1),***,the average abundance of aloricate ciliates decreased from the surface to 200 m,while biomass was highest in the 50-m *** importance of aloricate ciliatessouthern *** results will be helpful for understanding the variation in the pelagic community in waters of the southern ocean with intensified stratification.

关键词： aloricate ciliates spatial distribution community structure stratification southern ocean

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Distribution and abundance of krill in various areas of the southern ocean: dataset compilation based on samples collected in CHINARE during 2009-2019

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Advances in Polar Science 2024年第3期35卷 370-384页

作者： FANGGXiaoyue HU Shugang WANG Yanqing HANG Zishang TAO Zhencheng YANG Guang College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Engineering Technology Department Institute of OceanologyChinese Academy of SciencesQingdao 266071China Qingdao University of Science and Technology Qingdao 266042China 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 University of Chinese Academy of Sciences Beijing 10049China

This study investigates the composition,abundance,and basic biological parameters of krill in Prydz Bay,Antarctic Peninsula and Amundsen Sea by analyzing samples and environmental data from the Chinese National Antarctic Research Expeditions conducted between 2009/2010 and 2019/*** predominant krill species observed were Euphausia superba,Euphausia crystallorophias,and Thysanoessa ***,although the most widespread,exhibited the lowest mean abundance 9.96 ind:(1000 m^(-3))and biomass 0.31 g(1000 m^(-3)),predominantly found in low-latitude regions of the Amundsen Sea while *** was most concentrated in polynyas of Prydz ***,with an average abundance of 34.05 ind(1000 m^(-3))and biomass of 11.80 g:(1000 m^(-3)),was mainly distributed in the Antarctic Peninsula and Prydz *** study also identified regional variations in mean body length and frequency distributions of *** relationship between krill body length and wet weight followed a power-law *** differences were observed in the relationship between krill abundance,biomass,and environmental factors with varying *** the Amundsen Sea,no significant correlation was found between krill abundance and environmental ***,*** in Prydz Bay demonstrated a significant positive correlation with chlorophyll a concentration,while *** abundance and biomass in the Antarctic Peninsula exhibited a significant negative correlation with ice-free *** findings contribute valuable regional data on krll distribution,abundance,and biomass in the southern ocean,serving as foundational information for the conservation of the southern ocean ecosystem and Antarctic krill fishery management on a circumpolar scale.

关键词： southern ocean krill Euphausia superba biomass dataset

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Comparative analysis of significant wave height between a new southern ocean buoy and satellite altimeter

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Atmospheric and oceanic Science Letters 2021年第5期14卷 49-55页

作者： Jianjun Kang Runyu Mao Yiting Chang Hongli Fu National ocean Technology Center TianjinChina National Marine Data and Information Service TianjinChina

In-situ observation is restricted by the strong wind and waves in the southern ocean.A Westerlies EnvironmentalMonitoring Buoy(WEMB)was firstly deployed in the southern ocean during China’s 35th Antarctic Expedition,facilitating further understanding of the oceanic environmental characteristics of this *** the develop-ment of technology and the improvement of data processing methods,the accuracy of satellite altimeter productsis constantly improved,thus making it possible to inspect and evaluate the in-situ observation *** on theL3 products of multiple satellite altimeters,this paper analyzes and corrects the significant wave height(SWH)data of WEMB by means of data matching,error statistics,and linear least-squares *** this study,the authors obtained the following *** effect of gravitational acceleration changes with latitude on SWHaccuracy is fairly *** to the low response of WEMB to high-frequency waves,there is a systematic devia-tion.A feasible correction method is therefore proposed to improve the SWH accuracy of *** temporalvariation of the corrected SWH is highly consistent with that of the 10 m wind during the observation period,and its average value reaches 3.8 m.

关键词： Mooring buoy southern ocean Satellite altimeter Significant wave height

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