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Three-dimensional characteristics of mesoscale eddies simulated by a regional model in the northwestern pacific ocean during 2000–2008

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Acta oceanologica Sinica 2022年第10期41卷 74-93页

作者： Guijing Yang Xiayan Lin Guoqing Han Yu Liu Gengxin Chen Jianhui Wang Marine Science and Technology College Zhejiang Ocean UniversityZhoushan316000China State Key Laboratory of Satellite ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082China State Key Laboratory of Tropical oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China

Mesoscale eddies play vital roles in ocean processes.Although previous studies focused on eddy surface features and individual three-dimensional(3D)eddy cases in the northwestern pacific ocean,the analysis of unique eddy3D regional characteristics is still lacking.A 3D eddy detection scheme is applied to 9 years(2000-2008)of eddyresolving Regional ocean Modeling System(ROMS)output to obtain a 3D eddy dataset from the surface to a depth of 1000 m in the northwestern pacific ocean(15°-35°N,120°-145°E).The 3D characteristics of mesoscale eddies are analyzed in two regions,namely,Box1(Subtropical Countercurrent,15°-25°N,120°-145°E)and Box2(Southern Kuroshio Extension,25°-35°N,120°-145°E).In Box1,the current is characterized by strong vertical shear and weak horizontal shear.In Box2,the current is characterized by the strong Kuroshio,topographic effect,and the westward propagation of Rossby waves.The results indicate the importance of baroclinic instability in Box1,whereas in Box2,both the barotropic and baroclinic instability are important.Moreover,the mesoscale eddies’properties in Box1 and Box2 are distinct.The eddies in Box1 have larger number and radius but a shorter lifetime.By contrast,Box2 has fewer eddies,which have smaller radius but longer lifetime.Vertically,more eddies are detected at the subsurface than at the surface in both regions;the depth of 650 m is the turning point in Box1.Above this depth,the number of cyclonic eddies(CEs)is larger than that of anticyclonic eddies(AEs).In Box2,the number of CEs is dominant vertically.Eddy kinetic energy(EKE)and mean normalized relative vorticity in Box2are significantly higher than those in Box1.With increasing depth,the attenuation trend of EKE and relative vorticity of Box1 become greater than those of Box2.Furthermore,the upper ocean(about 300 m in depth)contains 68.6%of the eddies(instantaneous eddy).Only 16.6%of the eddies extend to 1000 m.In addition,about87%of the eddies are bowl-shaped eddies in the two regions.Only about 3%are cone-shaped eddies.With in

关键词： three-dimensional structures mesoscale eddies northwestern pacific ocean

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Projections of ocean climate for northwestern pacific ocean

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Acta oceanologica Sinica 2005年第1期24卷 134-145页

作者： CHOI Byung Ho KIM Dong Hoon CHOI Young Jin YUK Jin Hee Department of Civil and Environmental Engineering Sungkyunkwan University Suwon KoreaAbiko Research Laboratory Central Research Institute of Electric Power Industry JapanResearch Institute of Applied Mechanics Kyushu University JapanDepartment of Civil and Environmental Engineering Sungkyunkwan University Suwon Korea

The long-term adjustment processes of atmosphere and ocean in response to gradually increased atmospheric CO2 concentration have been analyzed in 70 and 140 a integrations with NCAR fully-coupled climate system model (CSM). In these experiments the CO2 concentration has been increased to double and quadruples the initial concentration, respectively. After 70 a, at the time of CO2 doubling, the model predicts surface air temperature rises by 1.2 and 1.5 K for the globe and the northwestern pacific ocean, respectively. The behavior of the quadrupling run is similar: each global and regional mean surface air temperatures increase by 2.8 and 3.0 K at the time of CO2 quadrupling. From the experiments, surface air temperature changes in the northwestern pacific ocean will be more distinctive compared with the global average, mainly due to exceptionally large wanning and sea level change near the entrance of the Kuroshio extension.

关键词： Climate model simulation global warming northwestern pacific ocean

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A new species of the glass sponge genus Walteria(Hexactinellida:Lyssacinosida:Euplectellidae)from northwestern pacific seamounts,providing a biogenic microhabitat in the deep sea

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Acta oceanologica Sinica 2021年第12期40卷 39-49页

作者： Chengcheng Shen Hong Cheng Dongsheng Zhang Bo Lu Chunsheng Wang Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China School of oceanography Shanghai Jiao Tong UniversityShanghai 200240China

We report on a hexactinellid sponge new to science,Walteria demeterae sp.nov.,which was collected from the northwestern pacific seamounts at depths of 1271–1703 m.Its tubular and basiphytous body,extensive lateral processes,numerous oval lateral oscula which are irregularly situated in the body wall,the presence of microscleres with oxyoidal,discoidal and onychoidal outer ends,and the absence of anchorate discohexasters,indicate it belongs to the genus Walteria of family Euplectellidae,which is also supported by molecular phylogenetic evidence from 18 S,28 S,16 S rRNA and cytochrome c oxidase subunit I(COI)gene sequences.The unique morphotype,which is structured by a thin and rigid framework of body wall and lateral processes consisting of diactins,characterizes it as a new species.Local aggregations of individuals of this new species coupled with their associated macrofauna in the Suda Seamount are reported,highlighting its functional significance in providing biogenic microhabitats in the deep sea.

关键词： Euplectellidae Walteria integrative taxonomy northwestern pacific ocean Porifera sponge aggregations

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