检索结果-南通市图书馆

Simulation of FY-2D infrared brightness temperature and sensitivity analysis to the errors of WRF simulated cloud variables

引用

Science China Earth Sciences 2018年第7期61卷 957-972页

作者： xiaokang shi Yaodong LI Jianwen LIU Xizi XIANG Le LIU Beijing Aviation Meteorological Institute Beijing 100085China Guizhou Sub-bureau of Southwest Air Traffic Management Bureau of Civil Aviation of China Guiyang 550002China Guangxi Meteorological Observatory Nanning 530022China

This study simulated FY-2 D satellite infrared brightness images based on the WRF and RTTOV models. The effects of prediction errors in WRF micro-and macroscale cloud variables on FY-2 D infrared brightness temperature accuracy were analyzed. The principle findings were as follows. In the T+0–48 h simulation time, the root mean square errors of the simulated brightness temperatures were within the range 10–27 K, i.e., better than the range of 20–40 K achieved previously. In the T+0–24 h simulation time, the correlation coefficients between the simulated and measured brightness temperatures for all four channels were >0.5. The simulation performance of water channel IR3 was stable and the best. The four types of cloud microphysical scheme considered all showed that the simulated values of brightness temperature in clouds were too high and that the distributions of cloud systems were incomplete, especially in typhoon areas. The performance of the THOM scheme was considered best, followed in descending order by the WSM6, WDM6, and LIN schemes. Compared with observed values, the maximum deviation appeared in the range 253–273 K for all schemes. On the microscale, the snow water mixing ratio of the THOM scheme was much bigger than that of the other schemes. Improving the production efficiency or increasing the availability of solid water in the cloud microphysical scheme would provide slight benefit for brightness temperature simulations. On the macroscale, the cloud amount obtained by the scheme used in this study was small. Improving the diagnostic scheme for cloud amount, especially high-level cloud, could improve the accuracy of brightness temperature simulations. These results could provide an intuitive reference for forecasters and constitute technical support for the creation of simulated brightness temperature images for the FY-4 satellite.

关键词： FY-2D RTTOV WRF Simulated brightness temperature Cloud amount Cloud microphysics scheme TyphoonMatmo

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

Application and improvement of an adaptive ensemble Kalman filter for soil moisture data assimilation

引用

Science China Earth Sciences 2010年第11期53卷 1700-1708页

作者： shi xiaokang Wen Jun Liu JianWen Tian Hui Wang Xin Li YaoDong Chinese Acad Sci Cold & Arid Reg Environm & Engn Res Inst Lab Climate Environm & Disasters Western China Lanzhou 730000 Peoples R China Beijing Aviat Meteorol Inst Beijing 100085 Peoples R China

Accurate assignment of model and observation errors is crucial for the successful application of land surface data assimilation algorithms. Poorly-specified model and observation errors can significantly degrade assimilation results. In 2008, Reichle et al. developed an operational procedure to adaptively tune model and observation errors. In this paper, we modified and applied Reichle's procedure in the Noah land surface model to assimilate observed surface soil moisture data. Numerical simulations showed that: (1) the best estimate of model and observation errors appears when the empirical factor β equals 1.02; (2) the Reichle procedure can be deployed to adaptively tune errors if their true values change slowly; and (3) convergence of the Reichle procedure was improved using better initial errors achieved by iterative computations.

关键词： Noah numerical simulation data assimilation adaptive ensemble Kalman filter soil moisture

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

Dynamic downscaling of near-surface air temperature at the basin scale using WRF-a case study in the Heihe River Basin, China

引用

Frontiers of Earth Science 2012年第3期6卷 314-323页

作者： Xiaoduo PAN Xin Li xiaokang shi Xujun HAN Lihui LUO Liangxu WANG Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of SciencesLanzhou 730000China

The spatial resolution of general circulation models （GCMs） is too coarse to represent regional climate variations at the regional, basin, and local scales required for many environmental modeling and impact assessments. Weather research and forecasting model （WRF） is a nextgeneration, fully compressible, Euler non-hydrostatic mesoscale forecast model with a runtime hydrostatic option. This model is useful for downscaling weather and climate at the scales from one kilometer to thousands of kilometers, and is useful for deriving meteorological parameters required for hydrological simulation too. The objective of this paper is to validate WRF simulating 5 km/ 1 h air temperatures by daily observed data of China Meteorological Administration （CMA） stations, and by hourly in-situ data of the Watershed Allied Telemetry Experimental Research Project. The daily validation shows that the WRF simulation has good agreement with the observed data; the R2 between the WRF simulation and each station is more than 0.93; the absolute of meanbias error （MBE） for each station is less than 2℃; and the MBEs of Ejina, Mazongshan and Alxa stations are near zero, with R2 is more than 0.98, which can be taken as an unbiased estimation. The hourly validation shows that the WRF simulation can capture the basic trend of observed data, the MBE of each site is approximately 2℃, the R2 of each site is more than 0.80, with the highest at 0.95, and the computed and observed surface air temperature series show a significantly similar trend.

关键词： weather research and forecasting model,dynamic downscaling surface air temperature Heihe River Basin Watershed Allied Telemetry Experimental Research Project

来源：

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

On Water： Free Catalysis Approach for the Synthesis of Nitrones from Hydroxamic Acids and Dimethy/ Diethyl Acetylenedicarboxylate

引用

Chinese Journal of Chemistry 2013年第8期31卷 1003-1006页

作者： Jian Li Yongqin He Xiaoyu Ren xiaokang shi Sizhuo Yang Xiai Gao Guosheng Huang Key Laboratory of Applied Organic Chemistry Lanzhou University Lanzhou Gansu 730000 China Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province Lanzhou Gansu 730000 China

Benzohydroxamic acid reacts with dimethyl acetylenedicarboxylate in the presence of 10 mol% NaOAc to gen- erate （E）-N-（1,4-dimethoxy-l,4-dioxobutan-2-ylidene）-l-phenylcarboxamide oxide in good-to-excellent yield in water at room temperature for 2 h, which supplies a simple, efficient and environmentally friendly method to syn- thesize a wide range of nitrones. The benefits of this strategy not only conform to the requirment of green chemisty, but also possess atom economy.

关键词： nitrones benzohydroxamic acid dimethyl acetylenedicarboxylate environmentally friendly greenchemisty

来源：

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

Fluid property identification of the Lower Cretaceous reservoirs with complex oil-water contacts in Deseo Basin,Chad

引用

Energy Geoscience 2024年第1期5卷 89-98页

作者： Xinxin Zhang Lianfeng Zhu Tianjiao Wang xiaokang shi Bo Han Jian Shen Hailei Gao Mud logging company Great Wall Drilling Company Ltd.CNPCLiaoningPanjin124010China CNPC Latin America Ltd. Beijing100034China CNPC Andes(Ecuador)Ltd. Beijing100034China

Recently,exploration breakthroughs have been made in the Lower Cretaceous sandstone reservoirs in the Doseo Basin,but the identification of reservoir fluid property is difficult due to variable reservoir lithology,complex oil-water contact within and faint responses of the oil zone,which causes the lower accuracy of reservoir fluid property identification with conventional mudlogging and wirelogging *** the geochemical logging,fluorescent logging,mud logging and cutting logging technology,in combination with formation test data,this paper distinguishes the crude oil types,analyzes the logging response characteristics of oil zone after water washing,and establishes the interpretation charts and parameter standards for reservoir fluid *** crude oil can be divided into two types,namely viscous-heavy and thin-light,based on total hydrocarbon content and component concentration tested by mud logging,features of pyrolysis gas chromatogram and fluorescence *** general characteristics of oil layers experienced water washing include the decrease of total hydrocarbon content and component concentration from mud logging,the decrease of S1 and PS values from geochemical logging,the decrease of hydrocarbon abundance and absence of some light components in pyrolysis gas chromatogram,and the decrease of fluorescence area and intensity from fluorescence *** to crude oil types,the cross plots of S1 versus peak-baseline ratio,and the cross plots of rock wettability versus fluorescence area ratio are drawn and used to interpret reservoir fluid ***,the standards of reservoir fluid parameter are established combining with the parameters of PS and the parameters in above charts,and comprehensive multiparameter correlation in both vertical and horizontal ways is also performed to interpret reservoir fluid *** application in the Doseo Basin achieved great success,improving interpretation ability of fluid property

关键词： Doseo Basin Reservoir interpretation Oil-water contact Fluid property Crude oil type

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

Improved SAL method and its application to verifying regional soil moisture forecasting

引用

Science China Earth Sciences 2014年第9期57卷 2657-2670页

作者： shi xiaokang LIU JianWen LI YaoDong TIAN Hui LIU XiangPei Beijing Aviation Meteorological Institute Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Chinese Academy Sciences Institute of Meteorology and Oceanography PLA University of Science and Technology

The regional verification of soil moisture is a vital step in evaluating and improving numerical model performance and utilizing forecast results. Currently, even with improved spatial and temporal resolutions of numerical model, verification methods for soil moisture data still rely on the traditional intensity verification parameters, such as mean error(ME) and root-mean-squared error(RMSE). Those methods provide only incomplete and sometimes inaccurate messages and thus hinder a proper evaluation of a forecast model. The SAL method is an object-based regional verification method with respect to precipitation forecasts. Based on the SAL method, a novel object-based method(SAL-DN) is proposed here, which can be used to test regional soil moisture. Both the ideal experiment and real experiment show that the SAL-DN method can reveal the differences between the observed and forecast soil moisture in three aspects: structure, amplitude, and location, and the results can reflect the actual situation. Furthermore, compared with the SAL method, the SAL-DN method is also capable of verifying physical quantities with high-value and low-value centers like temperature. Therefore, the SAL-DN method enhances verification accuracy and can be applied widely.

关键词： soil moisture numerical simulation regional verification SAL-DN

来源：

维普期刊数据库

同方期刊数据库

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

Diagnostic Analysis of a Rainstorm Process in Chongqing

引用

Meteorological and Environmental Research 2014年第1期5卷 28-35页

作者： Hu Rong shi xiaokang Li Yaodong Institute of Meteorology and Oceanography PLA University of Science and Technology Beijing Aviation Meteorological Institute

[Objective] The research aimed to analyze a rainstorm process in Chongqing. [Methed] Based on precipitation product datasets and NCEP reanalysis data, synoptic situation and diagnostic analysis of a heavy rain process during 11 -12 May, 2012 in Chongqing were made, and the diagnostic analysis included dynamic and vapor conditions, instability index, vapor helicity and vapor divergence flux. [ Result] The east-south moving short wave trough and east-north moving southwest vortex were the main synoptic systems causing the heavy rain; the positive vorticity advection before trough and after ridge helped the ascending motion from surface; the southwest stream at 700 hPa provided vapor and energy, promoting and maintaining the intense development of convection; the higher vapor helicity and lower vapor divergence flux were well corresponding with higher precipitation area, and had well temporal correlation, which was significant for forecast of precipitation area and its development; the ascended warm wet stream on the lower air came across the cold air on the upper air, triggering the heavy rain; the Kindex and A index were significant for the heavy rain forecasting. [ Conclusion] The research could provide some references for research and forecast of future rainstorm process in Sichuan and Chongqing.

关键词： Rainstorm Diagnostic analysis Vapor helicity Vapor divergence flux China

来源：

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

A Method Fusing Conventional Wind Field with Cloud Motion Wind and Its Application in Location Forecast of the Severe Convection

引用

Meteorological and Environmental Research 2014年第12期5卷 9-12,18页

作者： Tan Yongqiang Huang Bing shi xiaokang Beijing Aviation Meteorological Institute

Based on the fast algorithm of meteorological satellite guide wind vector tracing, cloud motion wind vector is calculated. According to the different characteristics of cloud motion wind field and sounding wind field, a method which fuses conventional data with unconventional data based on variation principle is presented. The fundamental is constructing a cost function that makes the value approach conventional data and the gradient approach unconventional data. Using this method, the conventional wind and the cloud motion wind are fused. The fused wind field has high resolu- tion. Its wind direction approaches cloud motion wind which indicates move direction of the synoptic system, and its velocity approaches conventional wind which indicates move velocity of the synoptic system. The wind field data are used for short-time forecast of severe convective weather location, which gets a good result.

关键词： Cloud motion wind Conventional wind field Fusion Severe convection Location forecast China

来源：

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

SCWO处理轮胎裂解脱硫废液的响应面法优化

引用

工业水处理 2017年第10期37卷 72-77页

作者：石晓康王黎武汉科技大学资源与环境工程学院湖北武汉430081

采用超临界水氧化(SCWO)法处理废旧轮胎热解过程中产生的脱硫废液,利用响应面法对处理过程中的主要影响因素进行了优化,并通过中心复合设计(CCD)建立了COD去除率的二次回归模型。将实测值与根据模型计算的预测值进行对比,结果表明,以模... 详细信息

采用超临界水氧化(SCWO)法处理废旧轮胎热解过程中产生的脱硫废液,利用响应面法对处理过程中的主要影响因素进行了优化,并通过中心复合设计(CCD)建立了COD去除率的二次回归模型。将实测值与根据模型计算的预测值进行对比,结果表明,以模型代替真实实验点对实验结果进行分析具有较高的可靠性。

关键词：超临界水氧化轮胎裂解脱硫废液响应面法

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

碱渣-矿渣固化淤泥的无侧限抗压强度与微观特征

引用

应用基础与工程科学学报 2021年第2期29卷 376-386页

作者：何俊王小琦石小康栗志翔湖北工业大学土木建筑与环境学院湖北武汉430068

为扩展工业固体废弃物的资源化利用途径,利用碱渣和矿渣作为固化剂对淤泥进行固化处理,通过无侧限抗压强度试验探讨固化剂掺量、养护龄期对固化淤泥强度的影响,并进行pH值、扫描电子显微镜(SEM)和X射线衍射(XRD)测试分析其微观特征.研... 详细信息

为扩展工业固体废弃物的资源化利用途径,利用碱渣和矿渣作为固化剂对淤泥进行固化处理,通过无侧限抗压强度试验探讨固化剂掺量、养护龄期对固化淤泥强度的影响,并进行pH值、扫描电子显微镜(SEM)和X射线衍射(XRD)测试分析其微观特征.研究表明:碱渣-矿渣固化处理初始含水率为80%的淤泥,可增大其无侧限抗压强度,减小破坏应变,增强抵抗变形的能力.与水泥固化土相比,碱渣-矿渣固化土的变形系数较小,抵抗变形的能力较小.30%碱渣+8%矿渣固化处理、养护7d时,固化土的无侧限抗压强度达到1228.3kPa,破坏应变为2.0%,淤泥的力学性质得到较大改善.矿渣、碱渣和黏土矿物之间可发生强烈的水化反应,生成水化硅酸钙、水化铝酸钙、钙矾石、水化氯铝酸钙等水化产物,起到胶结、填充、加筋的作用.研究成果可为碱渣和矿渣作为淤泥固化剂的资源化利用提供理论依据和参数支持.

关键词：淤泥碱渣矿渣固化无侧限抗压强度微观特征

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：