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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 *** 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 *** Box2,the current is characterized by the strong Kuroshio,topographic effect,and the westward propagation of Rossby *** results indicate the importance of baroclinic instability in Box1,whereas in Box2,both the barotropic and baroclinic instability are ***,the mesoscale eddies’properties in Box1 and Box2 are *** eddies in Box1 have larger number and radius but a shorter *** contrast,Box2 has fewer eddies,which have smaller radius but longer ***,more eddies are detected at the subsurface than at the surface in both regions;the depth of 650 m is the turning point in *** this depth,the number of cyclonic eddies(CEs)is larger than that of anticyclonic eddies(AEs).In Box2,the number of CEs is dominant *** kinetic energy(EKE)and mean normalized relative vorticity in Box2are significantly higher than those in *** increasing depth,the attenuation trend of EKE and relative vorticity of Box1 become greater than those of ***,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 *** addition,about87%of the eddies are bowl-shaped eddies in the two reg

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

Importance of Weighting for Multi-Variable Habitat Suitability Index Model: A Case Study of Winter- Spring Cohort of Ommastrephes bartramii in the northwestern pacific ocean

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Journal of ocean University of China 2012年第2期11卷 241-248页

作者： GONG Caixia CHEN Xinjun GAO Feng CHEN Yong College of Marine Sciences Shanghai Ocean University999 Hucheng Ring RoadLingang New CityShanghai 201306China The Key Laboratory of Sustainable Exploitation of oceanic Fisheries Resources Ministry of Education999 Hucheng Ring RoadShanghai 201306China School of Marine Sciences University of MaineOronoMaine 04469USA

Weighting values for different habitat variables used in multi-factor habitat suitability index (HSI) modeling reflect the relative influences of different variables on distribution of fish species. Using the winter-spring cohort of neon flying squid (Ommastrephes bartramii) in the northwestern pacific ocean as an example, we evaluated the impact of different weighting schemes on the HSI models based on sea surface temperature, gradient of sea surface temperature and sea surface height. We compared differences in predicted fishing effort and HSI values resulting from different weighting. The weighting for different habitat variables could greatly influence HSI modeling and should be carefully done based on their relative importance in influencing the resource spatial distribution. Weighting in a multi-factor HSI model should be further studied and optimization methods should be developed to improve forecasting squid spatial distributions.

关键词： weighting multi-factors habitat suitability index model Ommastrephes bartramii northwestern pacific ocean

Standardizing CPUE of Ommastrephes bartramii for Chinese squid-jigging fishery in Northwest pacific ocean

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Chinese Journal of oceanology and Limnology 2009年第4期27卷 729-739页

作者：田思泉陈新军陈勇许柳雄戴小杰 College of Marine Sciences Shanghai Ocean University Key Laboratory of Sustainable Exploitation of oceanic Fisheries Resources Ministry of Education Key Laboratory of Shanghai Education Commission for oceanic Fisheries Resources Exploitation School of Marine Sciences University of Maine

Generalized linear models （GLM） and generalized additive models （GAM） were used to standardize catch per unit fishing effort （CPUE） of Ommastrephes bartramii for Chinese squid-jigging fishery in Northwest pacific ocean. Three groups of variables were considered in the standardization： spatial variables （longitude and latitude）, temporal variables （year and month） and environmental variables, including sea surface temperature （SST）, sea surface salinity （SSS） and sea level height （SLH）. CPUE was treated as the dependent variable and its error distribution was assumed to be log-normal in each model. The model selections of GLM and GAM were based on the finite sample-corrected Akaike information criterion （AICC） and pseudo-coefficient （Pcf） combined P-value, respectively. Both GAM and GLM analysis showed that the month was the most important variable affecting CPUE and could explain 21.3% of variability in CPUE while other variables only explained 8.66%. The interaction of spatial and temporal variables weakly influenced the CPUE. Moreover, spatio-temporal factors may be more important in influencing the CPUE of this squid than environmental variables. The standardized and nominal CPUEs were similar and had the same trends in spatio-temporal distribution, but the standardized CPUE values tended to be smaller than the nominal CPUE. The CPUE tended to have much higher monthly variation than annual variations and their values increased with month. The CPUE became higher with increasing latitude-high CPUE usually occurred in 145°E-148°E and 149°E-162°E. The CPUE was higher when SST was 14-21℃ and the SLH from -22 cm to -18 cm. In this study, GAM tended to be more suitable than GLM in analysis of CPUE.

关键词： Ommastrephes bartramii CPUE standardization generalized additive model generalizedlinear model northwestern pacific ocean Chinese squid-jigging fishery

Evaluating the impact of spatio-temporal scale on CPUE standardization

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Chinese Journal of oceanology and Limnology 2013年第5期31卷 935-948页

作者：田思泉韩婵陈勇陈新军 College of Marine Sciences Shanghai Ocean University International College of Marine Studies Shanghai Ocean University Key Laboratory of Sustainable Exploitation of oceanic Fisheries Resources School of Marine Sciences University of Maine

This study focused on the quantitative evaluation of the impact of the spatio-temporal scale used in data collection and grouping on the standardization of CPUE(catch per unit effort).We used the Chinese squid-jigging fishery in the northwestern pacific ocean as an example to evaluate 24 scenarios at different spatio-temporal scales,with a combination of four levels of temporal scale(weekly,biweekly,monthly,and bimonthly)and six levels of spatial scale(longitude×latitude:0.5°×0.5°,0.5°×1°,0.5°×2°,1°×0.5°,1°×1°,and 1°×2°).We applied generalized additive models and generalized linear models to analyze the24 scenarios for CPUE standardization,and then the differences in the standardized CPUE among these scenarios were *** study shows that combinations of different spatial and temporal scales could have different impacts on the standardization of ***,at a fine temporal scale(weekly)different spatial scales yielded similar results for standardized *** choice of spatio-temporal scale used in data collection and analysis may create added uncertainty in fisheries stock assessment and *** identify a cost-effective spatio-temporal scale for data collection,we recommend a similar study be undertaken to facilitate the design of effective monitoring programs.

关键词： spatio-temporal scale CPUE standardization generalized additive model generalized linearmodel Ommastrephes bartramii northwestern pacific ocean

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 ***.,which was collected from the northwestern pacific seamounts at depths of 1271–1703 *** 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 *** 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 *** 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