检索结果-南通市图书馆

Improved ENSO simulation in regional coupled GCM using regressive correction method

Science China Earth Sciences 2007年第8期50卷 1258-1265页

作者： FU WeiWei1.& ZHOU GuangQing2 1.Nansen-Zhu International Research Center (NZC), institute of Atmospheric Physics, Chinese Academy of Sciences (CAS), Beijing 1.0029, China 2 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), institute of At-mospheric Physics, CAS, Beijing 1.0029, China 1. Nansen-Zhu International Research Center (NZC) Institute of Atmospheric Physics Chinese Academy of Sciences (CAS) Beijing 100029 China 2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics CAS Beijing 100029 China

A regressive correction method is presented with the primary goal of improving ENSO simulation in regional coupled GCM. It focuses on the correction of ocean-atmosphere exchanged fluxes. On the basis of numerical experiments and analysis, the method can be described as follows: first, driving the ocean model with heat and momentum flux computed from a long-term observation data set; the pro-duced SST is then applied to force the AGCM as its boundary condition; after that the AGCM’s simula-tion and the corresponding observation can be correlated by a linear regressive formula. Thus the re-gressive correction coefficients for the simulation with spatial and temporal variation could be obtained by linear fitting. Finally the coefficients are applied to redressing the variables used for the calculation of the exchanged air-sea flux in the coupled model when it starts integration. This method together with the anomaly coupling method is tested in a regional coupled model, which is composed of a global grid-point atmospheric general circulation model and a high-resolution tropical pacific Ocean model. The comparison of the results shows that it is superior to the anomaly coupling both in reducing the coupled model ‘climate drift’ and in improving the ENSO simulation in the tropical pacific Ocean.

关键词： anomaly coupling regressive correction method regional coupled model ENSO simulation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Molecular phylogenetic systematics of twelve species of Acipenseriformes based on mtDNA ND4L -ND4 gene sequence analysis

引用

Science China(Life Sciences) 2000年第2期43卷 129-137页

作者：张四明张亚平郑向忠陈永久邓怀汪登强危起伟张云武聂龙吴清江 1. Key Lab of Cellular and Molecular Evolution Kunming Institute of Zoology Chinese Academy of Sciences 650223 Kunming China 2. Yangtze River institute of Fisheries Chinese Academy of Fishery Sciences 434000 Jingzhou China 3. institute of Genetics Fudan University 200433 Shanghai China 4. institute of Hydrobiology Chinese Academy of Sciences 430072 Wuhan China

Acipenseriformes is an endangered primitive fish group, which occupies a special place in the history of ideas concerning fish evolution, even in vertebrate evolution. However, the classification and evolution of the fishes have been debated. The mitochondrial DMA (mtDNA) ND4L and partial A7D4 genes were first sequenced in twelve species of the order Acipenseriformes, including endemic Chinese species. The following points were drawn from DNA sequences analysis: (i) the two species of Huso can be ascribed to Acipenser; (ii) A. dabryanus is the mostly closely related to A. sinensis, and most likely the landlocked form of A. sinensis; (iii) genus Acipenser in trans-pacific region might have a common origin; (iv) mtDNA ND4L and ND4 genes are the ideal genetic markers for phylogenetic analysis of the order Acipenseriformes.

关键词： Acipenseriformes mtDNA ND4L mtDNA ND4 molecular phylogeny DNA sequencing.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Methane adsorption-induced coal swelling measured with an optical method

引用

International Journal of Mining Science and Technology 2015年第6期25卷 949-953页

作者： Tang Shuheng Wan Yi Duan Lijiang Xia Zhaohui Zhang Songhang School of Energy Resources China University of Geosciences Asia-pacific Department Petro China Research Institute of Petroleum Exploration & Development

In order to quantify the effect of matrix shrinkage on reservoir permeability during coalbed methane production, coal samples from Huozhou, Changzhi and Jincheng areas in Shanxi province （classified as high-volatile bituminous coal, low-volatile bituminous coal and anthracite, respectively） were collected, and adsorption-induced coal swelling in methane were determined by an optical method at 40 ℃ and pressure up to 1. MPa. All three coals showed similar behavior-that swelling increased as a function of pressure up to about 1. MPa but thereafter no further increase in swelling was observed. Swelling in the direction perpendicular to the bedding plane is greater than that parallel to the bedding plane, and the differences are about 7.77-8.33%. The maximum volumetric swelling ranges from 2.73% to 3.21.%-increasing with increasing coal rank. The swelling data can be described by a modified DR model. In addition, swelling increases with the amount of adsorption. However, the increase shows a relatively slower stage followed by a relatively faster stage instead of a linear increase. Based on the assumption that sorption-induced swelling/shrinkage of coal in methane is reversible, the permeability increases induced by coal shrinkage during methane desorption was analyzed, and the results indicate that the permeability change is larger for higher rank coal in the same unit of pressure depletion.

关键词： CoalAdsorptionMethaneSwellingPermeability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear local Lyapunov exponent and atmospheric predictability research

引用

Science China Earth Sciences 2006年第10期49卷 1111-1120页

作者： CHEN Baohua1. LI Jianping1.2 & DING Ruiqiang2 1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China 2. State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics (LASG), institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1.0029, China 1. College of Atmospheric Sciences Lanzhou University Lanzhou 730000 China 2. State Key Laboratory of Numerical Modeling for Atmospheric Science and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Because atmosphere itself is a nonlinear system and there exist some problems using the linearized equations to study the initial error growth, in this paper we try to use the error nonlinear growth theory to discuss its evolution, based on which we first put forward a new concept: nonlinear local Lyapunov exponent. It is quite different from the classic Lyapunov exponent because it may characterize the finite time error local average growth and its value depends on the initial condition, initial error, variables, evolution time, temporal and spatial scales. Based on its definition and the at-mospheric features, we provide a reasonable algorithm to the exponent for the experimental data, obtain the atmospheric initial error growth in finite time and gain the maximal prediction time. Lastly, taking 500 hPa height field as example, we discuss the application of the nonlinear local Lyapunov exponent in the study of atmospheric predictability and get some reliable results: atmospheric predictability has a distinct spatial structure. Overall, predictability shows a zonal distribution. Prediction time achieves the maximum over tropics, the second near the regions of Antarctic, it is also longer next to the Arctic and in subtropics and the mid-latitude the predictability is lowest. Particularly speaking, the average prediction time near the equation is 1. days and the maximum is located in the tropical Indian, Indonesia and the neighborhood, tropical eastern pacific Ocean, on these regions the prediction time is about two weeks. Antarctic has a higher predictability than the neighboring latitudes and the prediction time is about 9 days. This feature is more obvious on Southern Hemispheric summer. In Arctic, the predictability is also higher than the one over mid-high latitudes but it is not pronounced as in Antarctic. Mid-high latitude of both Hemispheres (30°S―60°S, 30°―60°N) have the lowest predictability and the mean prediction time is just 3―4 d. In addition, predictab

关键词： nonlinear, local, Lyapunov exponent, atmospheric predictability, maximal prediction time.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Transition from platemargin to intraplate environment: Geochemistry of basalts in Paleogene Liaohe basin, northeastern China

引用

Science China Earth Sciences 2005年第12期48卷 2069-2080页

作者： WU Changzhi1. GU Lianxing1. REN Zuowei1.2, ZHANG Zunzhong1. CHEN Zhenyan2 & ZHAO Ming1.1. State Key Laboratory of Mineral Deposit Research (Nanjing University), Department of Earth Sciences, Nanjing University, Nanjing 21.093, China 2. Exploration and Development Research institute of Liaohe Oilfield Branch Company, PetroChina, Panjin 1.401., China 1. State Key Laboratory of Mineral Deposit Research (Nanjing University) Department of Earth Sciences Nanjing University 210093 Nanjing China 2. Exploration and Development Research institute of Liaohe Oilfield Branch Company PetroChina 124010 Panjin China

Paleogene basalts from the Liaohe basin, northeastern China, are dominated by alkaline olivine basalts and olivine basalts. These basalts are generally enriched in high field strength elements (HFSE), depleted in large ion lithophile elements (LILE) and comparable to those of typical ocean island basalts (OIB). Positive anomalies of Ba, Sr and Zr with high Nb/U, U/Pb, Ce/Pb and Zr/Hf ratios imply that materials from an oceanic crust had been added to the mantle sources of the basalts. In addition, the basalts are generally depleted in Sr, Nd and Pb isotopes, indicating that an enriched mantle (EMI) and a depleted mantle (DM) sources were added to the OIB-like resource. Comprehensive research on lithosphere evolution and tectonic setting of the Liaohe basin and surrounding areas suggests that these basalts were derived by variable degrees of partial melt-ing from an upwelling asthenosphere mantle. Materials from an oceanic lithosphere were added to the source in company with Paleogene tectonic transition from platemargin to intraplate envi-ronment. Retreating and steepening of the subducting pacific oceanic plate could be the main cause for the tectonic environment transition.

关键词： geochemistry, basalt, Paleogene, Liaohe basin, North China Block, eastern China.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Minus domination number in cubic graph

引用

Chinese Science Bulletin 1998年第6期43卷 444-447页

作者： KANG Liying CAI Maocheng Department of Basic Course Shijiazhuang Railway Institute050043China institute of Systems Science Chinese Aeademy of SciencesBeijing 100080China Asian-pacific Operations Research Center

An upper bound is established on the parameter Γ -(G) for a cubic graph G and two infinite families of 3-connected graphs G k, G * k are constructed to show that the bound is sharp and, moreover, the difference Γ -(G * k)-γ s(G * k) can be arbitrarily large, where Г -(G * k) and γ s(G * k) are the upper minus domination and signed domination numbers of G * k, respectively. Thus two open problems are solved.

关键词： cubic graph minus domination signed domination

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Oligocene biogenic siliceous deposits on the slope of the northern South China Sea

引用

Science China Earth Sciences 2001年第10期44卷 912-918页

作者：王汝建房殿勇邵磊陈木宏夏佩芬祁景玉 1. Key Laboratory of Marine Geology Ministry of Education Tongji University 200092 Shanghai China 2. Open Laboratory of Marginal Sea Geology and Paleoenvironment South China Sea Institute of Oceanology Chinese Academy of Sciences 510301 Guangzhou China

The abundance of radiolarian, diatom and sponge spicule and H4SiO4 in pore-waters increase abruptly at the boundary between Early and Late Oligocene (about 30-27.5 Ma) at Site 1.48 of the northern South China Sea (SCS), indicating high biogenic silica accumulation during this time. At the same time (about 30-28 Ma), high biogenic silica deposition occurred in the central equatorial pacific. Comparison of the biogenic silica accumulation at Site 1.48 of the SCS with that at Site 929 of the Atlantic verifies that the biogenic silica accumulation between the low latitude pacific and Atlantic oceans expresses the evident relationship of compensation during the Oligocene. Biogenic silica accumulation decreased in the Atlantic, whereas it increased in the pacific at the boundary between the Early and Late Oligocene. It resulted from the formation and presence of North Atlantic deep water (NADW) in the Atlantic basin, indicating an intensive basin-basin fractionation. XRD analysis and SEM observation of the sam

关键词： : biogenic silica accumulation North Atlantic deep water fractionation silica preservation Oligocene the northern South China Sea.

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Numerical Study of Boundary Layer Structure and Rainfall after Landfall of Typhoon Fitow(201.): Sensitivity to Planetary Boundary Layer Parameterization

引用

Advances in Atmospheric Sciences 2019年第4期36卷 431-450页

作者： Meiying DONG Chunxiao JI Feng CHEN Yuqing WANG Zhejiang institute of Meteorological Sciences International pacific Research Center and Department of MeteorologySchool of Ocean and Earth Science and TechnologyUniversity of Hawaii at Manoa

The boundary layer structure and related heavy rainfall of Typhoon Fitow(201.), which made landfall in Zhejiang Province, China, are studied using the Advanced Research version of the Weather Research and Forecasting model, with a focus on the sensitivity of the simulation to the planetary boundary layer parameterization. Two groups of experiments—one with the same surface layer scheme and including the Yonsei University(YSU), Mellor–Yamada–Nakanishi–Niino Level 2.5,and Bougeault and Lacarrere schemes; and the other with different surface layer schemes and including the Mellor–Yamada–Janjic′ and Quasi-Normal Scale Elimination schemes—are investigated. For the convenience of comparative analysis, the simulation with the YSU scheme is chosen as the control run because this scheme successfully reproduces the track, intensity and rainfall as a whole. The maximum deviations in the peak tangential and peak radial winds may account for 1.% and 33%of those produced in the control run, respectively. Further diagnosis indicates that the vertical diffusivity is much larger in the first group, resulting in weaker vertical shear of the tangential and radial winds in the boundary layer and a deeper inflow layer therein. The precipitation discrepancies are related to the simulated track deflection and the differences in the simulated low-level convergent flow among all tests. Furthermore, the first group more efficiently transfers moisture and energy and produces a stronger ascending motion than the second, contributing to a deeper moist layer, stronger convection and greater precipitation.

关键词： planetary boundary layer parameterization landfalling typhoon boundary layer structure rainfall

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A three-dimensional variational ocean data assimilation system:Scheme and preliminary results

引用

Science China Earth Sciences 2006年第11期49卷 1212-1222页

作者： ZHU Jiang1.2, ZHOU Guangqing1. YAN Changxiang1. FU Weiwei1.& YOU Xiaobao1.3 1. International Center for Climate and Environment Sciences, institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 1.0029, China 2. Jiangsu Key Laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing 21.044, China 3. Beijing institute of Applied Meteorology, Beijing 1.0029, China 1. International Center for Climate and Environment Sciences Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. Jiangsu Key Laboratory of Meteorological Disaster Nanjing University of Information Science and Technology Nanjing 210044 China 3. Beijing institute of Applied Meteorology Beijing 100029 China

A new 3DVAR-based Ocean Variational Analysis System (OVALS) is developed. OVALS is capable of assimilating in situ sea water temperature and salinity observations and satellite altimetry data. As a component of OVALS, a new variational scheme is proposed to assimilate the sea surface height data. This scheme considers both the vertical correlation of background errors and the nonlinear temperature-salinity relationship which is derived from the generalization of the linear balance constraints to the nonlinear in the 3DVAR. By this scheme, the model temperature and salinity fields are directly adjusted from the altimetry data. Additionally, OVALS can assimilate the temperature and salinity profiles from the ARGO floats which have been implemented in recent years and some temperature and salinity data such as from expendable bathythermograph, moored ocean buoys, etc. A 21.year assimilation experiment is carried out by using OVALS and the Tropical pacific circulation model. The results show that the assimilation system may effectively improve the estimations of temperature and salinity by assimilating all kinds of observations. Moreover, the root mean square errors of temperature and salinity in the upper depth less than 420 m reach 0.63℃ and 0.34 psu.

关键词： data assimilation, 3DVAR, sea surface height, ARGO floats.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Workability Behaviour of Fe-C-Mo Steel Preforms During Cold Forging

引用

Journal of Iron and Steel Research International 2013年第9期20卷 126-130页

作者： S Narayan A Rajeshkannan K S Pandey S Shanmugam School of Engineering and Physics Faculty of ScienceTechnology and EnvironmentUniversity of South Pacific Department Metallurgical and Materials Engineering National Institute of Technology Department of Mechanical Engineering National Institute of Technology

A systematic method to construct the workability diagram for powder metallurgy （P/M） materials has been proposed. Preforms of Fe-0.8 %C, Fe-0.8% C-1. Mo and Fe-0.8 % C 2 % Mo were prepared to the relative den-sity of 0.86 with two different geometries through primary operations of P/M processes. Each sintered preform was cold upset forged with incremental compressive loading of 0.04 MN under three different lubricant conditions till a visible crack appeared at the free surface. Oyane＇s fracture criterion was used to develop a theory to study P/M prod-ucts. The least square method was used to determine the constants in fracture criteria and these equations were even- tually used to construct workability diagram. It is found that the proposed method was well in agreement with the experimental results.

关键词： workability diagram yield criterion formability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：