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Meridional deflection of global eddy propagation derived from tandem altimetry: Mechanism and implication

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science China earth sciences 2024年第3期67卷 811-825页

作者： Ge CHEN Xiaoyan CHEN frontiers science center for deep ocean multispheres and earth System School of Marine TechnologyOcean University of ChinaQindao 266100China Laboratory for Regional oceanography and Numerical Modeling Laoshan LaboratoryQindao 266237China

A common view on meridional deflection of eddy propagation is poleward for cyclones and equatorward for anticyclones. This widely accepted polarity-sensitive pattern has been increasingly undermined given that it is systematically violated on both zonal and regional scales as recently reported. Here, we approach the problem by exploring these violations in terms of eddy effects of spatiotemporal geostrophy, thermal fading, and flow dragging, yielding the following main conclusions.(1) The polarity-dependent deflection discrepancy is a pseudo feature resulting from a biased fit to the normalized eddy tracks which are spatially asymmetric(though azimuthally symmetric) between the two signs;Instead, the primary pattern of eddy deflection appears to be geographically correlated and polarity independent.(2) Geostrophic adjustment plays a critical role in defining the meridional movement of an eddy. Specifically, a consistent poleward(equatorward) trajectory bending of spatially(temporally) ageostrophic eddies is observed irrespective of their polarity.(3) The mechanism of eddy deflection is also determined by its zonal propagation direction. Westward propagating eddies are substantially affected by thermal fading, while opposite ones by flow dragging. A realistic and comprehensive understanding of eddy deflection mechanisms serves as a significant contribution to the prediction of eddy trajectory, and the protection of ocean environment.

关键词： Mesoscale eddies Eddy propagation Eddy meridional deflection Satellite observation Geostrophic adjustment

Diversity of culturable alginate lyase-excreting bacteria associated with Sargassum

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Acta oceanologica Sinica 2023年第6期42卷 70-77页

作者： Xiaomeng Sun Zhao Xue Cui Chen Shoujin Fan Huihui Fu Peng Wang Life science College Shandong Normal UniversityJinan 250014China College of Marine Life sciences/frontiers science center for deep ocean multispheres and earth System Ocean University of ChinaQingdao 266003China

Large numbers of bacteria live on the surface of various brown algae and can produce alginate lyases to consume alginate,an important component of the cell wall of brown *** is a genus of the largest canopyforming brown algae of more than 150 species,which are widely distributed in tropical and subtropical ***,our knowledge about the epiphytic bacteria and the alginate lyase-excreting bacteria from Sargassum is still ***,we investigated the diversity of the culturable epiphytic bacteria and alginate-degrading bacteria from Sargassum samples collected from the coastal seawaters of Shandong Province,*** total,37 strains belonging to 21 genera in 3 phyla were isolated,including 15 previously unreported genera,of which Vibrio(6/37)and Pseudoalteromonas(5/37)are the dominant *** strains,mainly Vibrio and Pseudoalteromonas species,were further identified as alginate lyase-excreting strains that can utilize alginate for *** extracellular alginolytic activity of the 8 strains was determined,and strains Vibrio sp.C42and Pseudoalteromonas sp.M9 showed the highest *** results provide a better understanding of brown algae epiphytes and alginate-degrading bacteria,and are fundamental for further studies on the interactions between brown algae and their epiphytes.

关键词： Sargassum epiphyte alginate lyase-excreting bacteria alginolytic activity

Pyroxenite melting at subduction zone:Implications for the origin of mafic arc magmas

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science China earth sciences 2023年第7期66卷 1678-1682页

作者： Long CHEN frontiers science center for deep ocean multispheres and earth System Key Lab of Submarine Geosciences and Prospecting TechniquesMOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China

*** The oceanic arc basalts and continental arc andesites are typical products of subduction zone magmatism(Straub et al.,2011;Zheng et al.,2020).However,there has been controversy over the lithology of their magma *** this issue is closely related to both physicochemical and geodynamic mechanisms of subduction zone magmatism,it has become one of the key issues in the study of convergent plate margins(Zheng et al.,2022).

关键词： magma subduction origin

A Spatially Dependent Nudging Method and Its Application to a Global Tide Assimilation

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Advances in Atmospheric sciences 2024年第12期41卷 2464-2477页

作者： Li LIU Xue'en CHEN Frontier science center for deep ocean multispheres and earth System(FDOMESand Physical oceanography Laboratory) Ocean University of ChinaQingdao 266100China

Tides represent a crucial dynamic process in the ocean and play a vital role in both marine and atmospheric studies,thus,accurate simulation of tidal processes is of the utmost importance in tidal circulation *** on the sequential data assimilation method and the concept of the Kalman gain matrix,this paper proposes a new nudging method with spatially dependent coefficients for tidal *** spatial-dependent nudging method not only retains the advantages of the traditional nudging method but also facilitates the direct determination of a more reasonable spatial distribution of nudging *** the M_(2)tidal constituent(the main lunar semidiurnal tide)as an illustration,we conducted assimilation experiments of sea-level data to the barotropic circulation and tide model to assess the global harmonic constants of the M_(2)*** results demonstrate that the spatial-dependent nudging method successfully mitigates deviations of tidal phase *** assimilation using the new method,the deviations of the M_(2)tidal amplitude and phase lag can be reduced by 47%and 18%compared to the traditional nudging method,respectively,while the respective values for the non-assimilated case are as much as 9%and 11%.We also applied the S-nudging method to realistic tidal simulations and noted a significantly enhanced effectiveness relative to traditional methods,making it highly valuable for modeling oceanic tidal circulations.

关键词： nudging method assimilation ocean model tidal simulation

Resuspended sediment in marine bottom water as a potential source for refractory dissolved organic matter

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science China earth sciences 2024年第11期67卷 3638-3640页

作者： Xiaoqing LIU Rui BAO frontiers science center for deep ocean multispheres and earth System Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Geology Qingdao Marine Science and Technology CenterQingdao 266237China

Marine dissolved organic matter (DOM) represents the largest carbon reservoir (~662 Pg carbon;Hansell, 2013). DOM in the ocean could be introduced from rivers, marine aerosols, and adjacent continental shelves, even produced, and transformed by physical processes (such as desorption and transfer), as well as microbial processes. A significant amount of DOM resists quick degradation and is classified as refractory DOM (RDOM) based on its reactivity and longevity (Hansell, 2013).

关键词： dissolved DOM reservoir

Toward earth system modeling with resolved clouds and ocean submesoscales on heterogeneous many-core HPCs

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National science Review 2023年第6期10卷 153-167页

作者： Shaoqing Zhang Shiming Xu Haohuan Fu Lixin Wu Zhao Liu Yang Gao Chun Zhao Wubing Wan Lingfeng Wan Haitian Lu Chenling Li Yanfei Liu Xiaojing Lv Jiayu Xie Yangyang Yu Jun Gu Xuantong Wang Yan Zhang Chenhui Ning Yunlong Fei Xiuwen Guo Zhaoying Wang Xue Wang Zhenming Wang Binglin Qu Mingkui Li Haoran Zhao Yingjing Jiang Guang Yang Lv Lu Hong Wang Hong An Xin Zhang Yu Zhang Wentao Ma Fujiang Yu Jing Xu Xiaopei Lin Xueshun Shen Key Laboratory of Physical oceanography Ministry of Education/Institute for Advanced Ocean Study/Frontiers Science Center for Deep Ocean Multispheres and Earth System (DOMES) College of Oceanic and Atmospheric Sciences Ocean University of China Laoshan Laboratory Ministry of Education Key Lab for earth System Modeling and Department of Earth System Science Tsinghua University National Supercomputing center in Wuxi frontiers science center for deep ocean multispheres and earth System and Key Laboratory of Marine Environment and Ecology Ministry of Education Ocean University of China deep Space Exploration Laboratory/School of earth and Space sciences University of Science and Technology of China School of Computer science and Technology University of Science and Technology of China CEAKJ ADPRHexa Inc. National Marine Environmental Forecasting center State Key Laboratory of Satellite ocean Environment Dynamics Second Institute of Oceanography Ministry of Natural Resources Chinese Academy of Meteorological sciences The center of earth System Modeling and Prediction China Meteorological Administration

With the aid of the newly developed ’Sunway’ heterogeneous-architecture supercomputer,which has world-leading HPC(high-performance computer) capability,a series of high-resolution coupled earth system models(SW-HRESMs) with up to 5 km of atmosphere and 3 km of ocean have been *** models can meet the needs of multiscale interaction studies with different computational *** we describe the progress of SW-HRESMs development,with an overview of the major advancements made by the international earth science community in *** also show the preliminary results of SW-HRESMs with regard to capturing major weather-climate extremes in the atmosphere and ocean,stressing the importance of permitted clouds and ocean submesoscale eddies in modeling tropical cyclones and eddy-mean flow interactions,and paving the way for further model development to resolve finer scales with even higher resolution and more realistic ***,in addition to increasing model resolution,the development procedure for a non-hydrostatic cloud and ocean submesoscale resolved ESM is discusse d,laying out the major scientific directions of such a huge modeling advancement.

关键词： high-resolution earth system models heterogeneous supercomputer cloud and submesoscale resolving weather-climate extremes finer cross-scale interactions

Kuroshio Intrusion Combined with Coastal Currents Affects Phytoplankton in the Northern South China Sea Revealed by Lipid Biomarkers

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Journal of ocean University of China 2023年第2期22卷 576-586页

作者： WANG Yaoyao BI Rong GAO Jiawei ZHANG Hailong LI Li DING Yang JIN Gui’e ZHAO Meixun frontiers science center for deep ocean multispheres and earth System and Key Laboratory of Marine Chemistry Theory and TechnologyMinistry of EducationOcean University of ChinaQingdao 266100China Laboratory for Marine Ecology and Environmental science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China

The northern South China Sea(NSCS)is significantly influenced by the Kuroshio intrusion and the coastal *** knowledge on the roles of both currents on phytoplankton spatial variations is still ***,we investigated the concentrations of phytoplankton biomarkers and their proportions in surface suspended particles from 47 sites of the NSCS during summer of 2017 and ***/epi-brassicasterol,dinosterol,and C37 alkenones were used as proxies of biomass for diatoms,dinoflagellates,and haptophytes,respectively,and their sum indicating total phytoplankton biomass.A three end-member mixing model was applied to quantitatively assess the influence extent of the Kuroshio intrusion and the coastal *** results showed that the Kuroshio intrusion and the coastal currents contributed equally to the overall surface water masses in the study area;however,the two currents had distinct effects on the spatial distribution of *** phytoplankton biomass,the eutrophic coastal currents were likely to be the main controlling factors,while the impact of the Kuroshio intrusion was weak and stimulated significant increases in phytoplankton biomass only at certain boundary *** phytoplankton community structures,the Kuroshio and its intrusion were the main factors,resulting in an increase in the proportions of dinoflagellates and *** proportion of diatoms slightly increased due to the influence of the coastal *** study quantifies the effects of the Kuroshio and the coastal currents on phytoplankton in the NSCS in terms of hydrological parameters,providing an important basis for the understanding of ecological functions and biogeochemical cycles in marginal sea-open ocean boundary regions.

关键词： sterols alkenones phytoplankton northern South China Sea Kuroshio coastal currents

Geographical Information Visualization on a Panoramic Sphere in an Immersive Environment

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Journal of ocean University of China 2023年第4期22卷 961-974页

作者： MA Ying TIAN Fenglin LIU Wen TANG Moran LI Jinyu CHEN Ge frontiers science center for deep ocean multispheres and earth System School of Marine TechnologyOcean University of ChinaQingdao 266100China Laboratory for Regional oceanography and Numerical Modeling Laoshan LaboratoryQingdao 266100China Faculty of Information science and Engineering Ocean University of ChinaQingdao 266100China

In this paper,we propose a novel approach to visualizing global geographical information:a panoramic sphere in an immersive *** whole geographical surface can be observed through the rotating of heads as the viewpoint of the panoramic sphere is inside the *** compared three approaches to visualizing the earth for rendering the geographical information in a virtual reality *** the tasks of terrestrial and marine geographical information,we compare the visualization effects on a)a globe,b)a flat map and c)a panoramic *** geographical information tasks include the area comparison and direction *** geographical information tasks contain the visualization of sea surface temperature and sea surface *** terrestrial geographical information tasks,the experimental results show that the panoramic sphere outperforms the globe and the flat map,with a higher average accuracy and a shorter *** marine geographical information task,the panoramic sphere visualization is also superior to the flat map and the globe in an immersive environment for the sea surface temperature data and the sea surface current *** all three visualization experiments,the panoramic sphere is most preferred by the participants,particularly for global,transcontinental and transoceanic needs.

关键词： the panoramic sphere immersive environment virtual reality oceanographic information visualization

Using statolith shape analysis to identify fi ve commercial Loliginidae squid species in Chinese waters

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Journal of oceanology and Limnology 2021年第3期39卷 1160-1167页

作者： Jianzhong GUO Dan LIU Chi ZHANG Yongjun TIAN Zhixin LI Fisheries College Ocean University of ChinaQingdao 266003China frontiers science center for deep ocean multispheres and earth System(FDOMES) Ocean University of ChinaQingdao 266100China Laboratory for Marine Fisheries science and Food Production Processes Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

Identification of squids in the family Loliginidae is a time-consuming exercise because of the highly overlapping distributions of species and their overall similarity(fin shape and size,sucker ring dentition,and color).Identifying squid based on statolith morphology is considered more accurate than identifying species based on beaks or gladius *** report and compare the statolith shape offive commercially Loliginidae squid(Uroteuthis(Photololigo)duvaucelii,***,***,Loliolus beka,***)to determine how well these structures discriminate *** on statolith morphology,variation in the lateral and dorsal domes enables an 84.8%success rate at classifying *** factors correlate with statolith shape,and for vertically migrating squid,statolith relative size decreases with increased depth of *** morphology can be used to effectively and accurately identify species of Loliginidae squid occurring in Chinese waters,and may prove valuable for identifying and managing squid resources.

关键词： statolith shape analysis Loliginidae squid fishery management Chinese waters