检索结果-南通市图书馆

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

厄尔尼诺-南方涛动研究进展

科学通报 2024年第8期69卷 1047-1057页

作者：张晓琳马永星大连海事大学航海学院大连116085 Department of Earth and Planetary Sciences Kyushu UniversityFukuoka 819-0395Japan fisheries and oceans canada Bedford Institute of OceanographyDartmouth B2Y 4A2Canada

厄尔尼诺-南方涛动(El Nino and Southern Oscillation,ENSO)对全球气候都具有重要的影响,如印度洋季风、秘鲁沿岸的渔业生产以及北美的气候等.过去的研究在ENSO的观测、理论、预报和数值模拟等方面都取得了长足的进展,但依然有很多问... 详细信息

厄尔尼诺-南方涛动(El Nino and Southern Oscillation,ENSO)对全球气候都具有重要的影响,如印度洋季风、秘鲁沿岸的渔业生产以及北美的气候等.过去的研究在ENSO的观测、理论、预报和数值模拟等方面都取得了长足的进展,但依然有很多问题尚待解决.本文简要地回顾了过去在ENSO的相关理论、预报、非对称性以及年代际变化、古气候下的变化以及数值模拟方面的研究:首先回顾了ENSO盛行的几组理论,具体包括Bjerknes正反馈机制、延迟振子理论、充放电振子理论、平流反射振子理论以及西太平洋振子理论.其次,系统地总结了厄尔尼诺常用的预报方法以及预报因子(如暖水体积、西太平洋风场、印度洋-太平洋风场的积分及赤道流场等),并讨论了目前预报仍然存在的局限性;非对称性和年代际变化是ENSO重要的特征,本文详细地阐述了这方面的相关研究进展及存在的问题.再次,介绍了关于ENSO的古气候研究目前所取得的成果以及主要结论,并对数值模拟方面仍然存在的问题及ENSO对其他海盆的影响进行了讨论;最后,对上述相关方面存在的不足以及亟待解决的问题进行了探讨和总结.

关键词：厄尔尼诺-南方涛动动力学机制预报古气候盐度海盆间相互作用

同方期刊数据库

New indices to balanceα-diversity against tree size inequality

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2024年第1期35卷 229-237页

作者： Li Zhang Brady K.Quinn Cang Hui Meng Lian Johan Gielis Jie Gao Peijian Shi College of Ecology and Environment Bamboo Research InstituteNanjing Forestry University159 Longpan RoadNanjing 210037People’s Republic of China fisheries and oceans canada Andrews Biological Station125 Marine Science DriveSt.AndrewsNB E5B 0E4Canada Department of Mathematical Sciences Centre for Invasion BiologyStellenbosch UniversityMatieland 7602South Africa Mathematical and Physical Biosciences African Institute for Mathematical SciencesCape Town 7945South Africa Department of Biosciences Engineering University of AntwerpB-2020 AntwerpBelgium College of Life Science Xinjiang Normal University102 Xinyi RoadUrumqi 830054People’s Republic of China

The number and composition of species in a community can be quantified withα-diversity indices,including species richness(R),Simpson’s index(D),and the Shannon-Wiener index(H΄).In forest communities,there are large variations in tree size among species and individu-als of the same species,which result in differences in eco-logical processes and ecosystem ***,tree size inequality(TSI)has been largely neglected in studies using the available diversity *** TSI in the diameter at breast height(DBH)data for each of 99920 m×20 m forest census quadrats was quantified using the Gini index(GI),a measure of the inequality of size *** generalized performance equation was used to describe the rotated and right-shifted Lorenz curve of the cumulative proportion of DBH and the cumulative proportion of number of trees per *** also examined the relationships ofα-diversity indices with the GI using correlation *** generalized performance equation effectively described the rotated and right-shifted Lorenz curve of DBH distributions,with most root-mean-square errors(990 out of 999 quadrats)being<*** were significant positive correlations between each of threeα-diversity indices(i.e.,R,D,and H’)and the ***,the total abundance of trees in each quadrat did not significantly influence the *** means that the TSI increased with increasing spe-cies ***,two new indices are proposed that can balanceα-diversity against the extent of TSI in the com-munity:(1−GI)×D,and(1−GI)×H’.These new indices were significantly correlated with the original D and H΄,and did not increase the extent of variation within each group of *** study presents a useful tool for quantifying both species diversity and the variation in tree sizes in forest communities,especially in the face of cumulative species loss under global climate change.

关键词： Diameter at breast height(DBH) Gini index Shannon-Wiener index Simpson’s index Quadrat Tree size

Impacts of climate change on seasonal extreme waves in the Northwest Atlantic using a Spatial Neural Gas clustering method

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean Engineering and Science 2023年第4期8卷 367-385页

作者： Hamid Goharnejad Will Perrie Bash Toulany Mike Casey Minghong Zhang fisheries and oceans canada Bedford Institute of OceanographyDartmouthNova ScotiaCanada

Having estimates of wave climate parameters and extreme values play important roles for a variety of different societal activities,such as coastal management,design of inshore and offshore structures,marine transport,coastal recreational activities,fisheries,*** study investigates the efficiency of a state-of-the-art spatial neutral gas clustering method in the classification of wind/wave data and the evaluation of extreme values of significant wave heights(Hs),mean wave direction(MWD)and mean wave periods(T0)for two 39-year time periods;from 1979 to 2017 for the present climate,and from 2060 to 2098,for a future climate change scenario in the Northwest *** data were constructed by application of a numerical model,WAVEWATCHIII TM(hereafter,WW3),to simulate the wave climate for the study area for both present and future *** from the model was extracted for the wave climate,in terms of the wave parameters,specifically Hs,MWD and T0,which were analyzed and compared for winter and summer seasons,for present and future *** order to estimate extreme values in the study area,a Natural Gas(hereafter,NG)clustering method was applied,separate clusters were identified,and corresponding centroid points were *** analyze data at each centroid point,time series of wave parameters were extracted,and using standard stochastic models,such as Gumbel,exponential and Weibull distribution functions,the extreme values for 50 and 100-year return periods were ***,the impacts of climate change on wave regimes and extreme values can be specified.

关键词： Extreme wave parameters WW3 RCP8.5 Spatial neural gas clustering method

Fishing for Atlantic cod (Gadus morhua) with pots and gillnets: A catch comparison study along the southeast coast of Labrador

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aquaculture and fisheries 2022年第4期7卷 433-440页

作者： Khanh Q.Nguyen Corey J.Morris fisheries and oceans canada Northwest Atlantic Fisheries CentreSt.John’sNewfoundlandA1C5X1Canada

Gillnets are the primary fishing gear used to catch Atlantic cod(Gadus morhua)in coastal areas of Newfoundland and Labrador but are known to catch non-target species and produce lower quality fish than live-catch *** purpose of this study was to compare the catch efficiency of collapsible cod pots against gillnets near the Gilbert Bay Marine Protected Area(MPA),Labrador,where a reduction in by-catch is *** showed that one cod pot caught half as much Atlantic cod as a gillnet,and pots had a relatively stable catch rate throughout the sampling period,whereas gillnets caught relatively few fish later in the sampling ***,nearly all fish sampled with pots were caught alive undamaged,whereas most gillnet-caught fish experienced damage or *** a conservation measure pot-fishing would enable fishing within close proximity to the Gilbert Bay MPA and the live-release of visually distinguishable Gilbert Bay cod,thereby mitigating against the negative effects of commercial fishing on this protected Atlantic cod population.

关键词： Catch rates Cod pots Bycatch reduction Gillnets Conservation Atlantic cod fishery

Revealing the Effects of the El Nio-Southern Oscillation on Tropical Cyclone Intensity over the Western North Pacific from a Model Sensitivity Study

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2013年第4期30卷 1117-1128页

作者：周洋江静鹿有余黄安宁 School of Atmospheric Sciences Nanjing University fisheries and oceans canada Bedford Institute of Oceanography

Five sets of model sensitivity experiments are conducted to investigate the influence of tropical cyclone （TC） genesis location and atmospheric circulation on interannual variability of TC intensity in the western North Pacific （WNP）. In each experiment, bogus TCs are placed at different initial locations, and simulations are conducted with identical initial and boundary conditions. In the first three experiments, the specified atmospheric and SST conditions represent the mean conditions of E1 Nifio, La Nifia, and neutral years. The other two experiments are conducted with the specified atmospheric conditions of E1 Nifio and La Nifia years but with SSTs exchanged. The model results suggest that TCs generated in the southeastern WNP incurred more favorable environmental conditions for development than TCs generated elsewhere. The different TC intensities between E1 Nifio and La Nifia years are caused by difference in TC genesis location and low-level vorticity （VOR）. VOR plays a significant role in the intensities of TCs with the same genesis locations between E1 Nifio and La Nina years.

关键词： tropical cyclone intensity western North Pacific ENSO MM5 low level vorticity

Atmospheric and oceanic responses to Super Typhoon Mangkhut in the South China Sea:a coupled CROCO-WRF simulation

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第4期41卷 1369-1388页

作者： Mingyu LI Yijun HE Guoqiang LIU School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China Department of Engineering Mathematics and Internetworking Dalhousie UniversityHalifax B3H 4R2Canada Bedford Institute of Oceanography Fisheries and Oceans CanadaDartmouth B2Y 4A2Canada

The South China Sea(SCS)is the largest marginal sea in the Northwest Pacific Ocean,and it encounters frequent *** atmosphere and ocean will create significant thermal and dynamic responses during the intense disturbance caused by ***,these responses have not been thoroughly investigated owing to the complicated marine *** to the satellite data,the SCS Basin was observed to have a strong sea surface temperature(SST)response to Typhoon Mangkhut,resulting in widespread SST cooling.A coupled model was used to investigate the atmospheric and oceanic responses to Typhoon ***-track data,satellite SST,and ARGO measurements show that the coupled WRF-CROCO simulation displays better track,intensity,SST,temperature,and salinity profiles than those of the WRF-only *** show that the typhoon induced rightward intensifications in wind speed,ocean current,and *** following are some remarkable atmosphere and ocean responses:(1)the SST below the inner-core region is cooled by 1℃,resulting in a 37%-44%decrease in wet enthalpy,and the central pressure is increased by~9 ***,the changes in SST below the innercore region of the SCS Basin have a significant impact on air-sea fluxes under high-wind conditions;(2)the ocean boundary layer analysis shows that near-inertial oscillations on the right side of the typhoon track and a strong inertial current up to~2.28 m/s in the upper ocean were observed,which resonated with the local wind and flow field on the right side and induced strong SST cooling;(3)a decrease in SST decreased the moist static energy of the typhoon boundary layer,thereby weakening the typhoon’s *** difference in equivalent potential temperature and sea surface pressure have a good correlation,indicating that the influence of moist static energy on typhoon intensity cannot be overlooked.

关键词： Super Typhoon Mangkhut coupled ocean-atmosphere model wet enthalpy inertial current

Simulation of Typhoon-Driven Waves in the Yangtze Estuary with Multiple-Nested Wave Models

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2005年第4期19卷 613-624页

作者：徐福敏 Will Perrie 张君伦宋志尧 Bechara Toulany College of Ocean Engineering Hohai University Nanjing210098China fisheries and oceans canada Bedford Institute of Oceanography DartmouthNova Scotia Canada

Typhoon-generated waves are simulated with two numerical wave models, the SWAN model for the coastal and Yangtze Estuary domain, nested within the WAVEWATCHIII （WW3） for the basin-scale East China Sea domain. Typhoon No. 8114 is chosen because it was very strong, and generated high waves in the Estuary. WW3 was implemented for the East China Sea coarse-resolution computational domain, to simulate the waves over a large spatial scale and provide boundary conditions for SWAN model simulations, implemented on a fine-resolution nested domain for the Yangtze Estuary area. The Takahashi wind model is applied to the simulation of the East China Sea scale （3-hourly） and Yangtze Estuary scale （1-hourly） winds. Simulations of significant wave heights in the East China Sea show that the highest waves are on the right side of the storm track, and maxima tend to occur at the eastern deep-water open boundary of the Yangtze Estuary. In the Yangtze Estuary, incoming swell is dominant over locally generated waves before the typhoon approaches the Estuary. As the typhoon approaches the Estuary, wind waves and swell coexist, and the wave direction is mainly influenced by the swell direction and the complex topography.

关键词： WW3 SWAN typhoon-generated waves East China Sea Yangtze Estuary Takahashi wind model 2 D wave spectra significant wave height

A two scale nonlinear fractal sea surface model in a one dimensional deep sea

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2010年第5期19卷 607-612页

作者：谢涛邹光辉 William Perrie 旷海兰陈伟 School of Information Engineering of Wuhan University of Technology fisheries and oceans canada Bedford Institute of OceanographyB2Y 4A2DartmouthNSCanada

Using the theory of nonlinear interactions between long and short waves, a nonlinear fractal sea surface model is presented for a one dimensional deep sea. Numerical simulation results show that spectra intensity changes at different locations （in both the wave number domain and temporal-frequency domain）, and the system obeys the energy conservation principle. Finally, a method to limit the fractal parameters is also presented to ensure that the model system does not become ill-posed,

关键词： fractal sea surface models nonlinear interaction numerical method

Molecular Cloning of sodB Gene from Vibrio alginolyticus HY9901 and Its Bioinformatics Analysis

在线全文

学校读者我要写书评

暂无评论

Asian Agricultural Research 2024年第7期16卷 42-47页

作者： Shuai YANG Yingying JIANG Haiyun FENG Weijie ZHANG Na WANG Xiaonan LU Huanying PANG fisheries College Guangdong Ocean UniversityZhanjiang 524025China Guangdong Provincial Key Laboratory of Aquatic Animal Disease Control and Healthy Culture&Key Laboratory of Control for Diseases of Aquatic Economic Animals of Guangdong Higher Education Institutes Zhanjiang 524025China Chinese Academy of Inspection and Quarantine Beijing100176China Department of Food Science and Agricultural Chemistry Faculty of Agricultural and Environmental SciencesMcGill UniversitySainte-Anne-de-Bellevue H9X 3V9Canada

Vibrio alginolyticus is a zoonotic bacterium.A pair of specific primers was designed using the sodB gene sequence of Vibrio alginolyticus HY9901 in order to amplify the full length of the gene by *** results indicated that the total length of the sodB gene was 585 bp and that it could encode 194 amino *** predicted amino acid sequence derivation indicated that the molecular weight of the protein was approximately 21.56 kDa,with an isoelectric point of *** prediction of the N-terminal signal peptide structure of the protein,no significant signal peptide cleavage site was observed,indicating that the protein lacked both a signal peptide and a transmembrane *** amino acid sequence contained an N-glycosylation site,a casein kinase II phosphorylation site,a microsomal C-terminal target signal site,and a manganese and iron superoxide dismutase signal *** probability of intracytoplasmic localization of the SodB protein was 56.5%,which was analyzed according to the subcellular localization of the *** amino acid sequence of the sodB gene of *** exhibited 98%-100%homology to other Vibrio species,clustering into the same subfamily with ***,indicating a relatively close relationship between *** the prediction of protein structure,the proportions ofα-helix,random coil,β-sheet,and extended strand were 48.45%,30.41%,5.67%,and 15.46%,*** similarity to template 1dt0.1.A reached 71.58%.A PTM site analysis revealed the presence of phosphorylation,glycosylation,ubiquitination,sumoylation,acetylation,and methylation modification sites,as well as the absence of lactylation modification sites.

关键词： Vibrio alginolyticus Gene cloning sodB gene Bioinformatics analysis