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Real-time simulation and mechanistic analysis of a squall line case in East China

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Atmospheric and Oceanic Science Letters 2016年第5期9卷 394-400页

作者： SU Yang PING Fan shen xin-yong MIAO Chun-sheng Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory of Meteorological Disaster of Ministry of EducationNanjing University of Information Science and Technology Laboratory of Cloud-Precipitation Physics and Severe Storms (LACS) Institute of Atmospheric PhysicsChinese Academy of Sciences

The characteristics and influence of the dynamical, thermal, and microphysical processes of a squall line are studied using the WRF model. This squall line occurred in the Yangtze and Huaihe river basins in Anhui Province on 5 July 2013. The active cold pool and the downdraft caused by the rear inflow contribute to the development of the squall line. The cold pool develops strongly, moves ahead of the storm, and then cuts off the supply of the warm air to the updraft, leading to the storm＇s demise. Analysis of the microphysics budget shows that snow crystals contribute to the rainfall rate most during the evolution of the squall line. The heating effect is predominant at the high level,whereas cooling plays an important role at the low level. A typical stratified ‘seeder–feeder＇ structure of the cloud exists primarily in the convective region of the squall line. The heights of the cloud ice and snow layers decrease continuously with time, and both the seeder and feeder cloud decrease dramatically in the dissipation stage, which leads to the reduced rainfall rate.

关键词： Cold pool microphysics physical mechanism squall line

A Fourteen-Year Climatology of the Southwest Vortex in Summer

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Atmospheric and Oceanic Science Letters 2014年第6期7卷 510-514页

作者： FU shen-Ming ZHANG Jing-Ping SUN Jian-Hua shen xin-yong Chengdu Institute of Plateau Meteorology China Meteorological Administration International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of Sciences Department of Atmospheric Sciences Nanjing University of Information Science and Technology Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology

Statistical studies were conducted on the southwest vortex(SWV) during the summers of 2000–13 using high-resolution reanalysis data with a horizontal resolution of 0.5°× 0.5°. A total of 578 SWVs were detected, with a maximum interannual frequency of 55. The variation of the interannual frequency featured a period of around six years. The most active period of SWVs was early July and the maximum occurrence of SWVs appeared in early morning(0200–0800 Beijing Standard Time(BST)). Most of the SWVs were short-lived, with only 66 cases(11.4%) lasting for more than 24 h. In addition, the moving tracks and three-dimensional shape of long-lived(≥ 36 h) SWVs are also presented. For those SWVs that lasted for more than 12 h, four types of SWVs(Types I–IV) were identified using a new method, and the results indicated that the dynamical and thermodynamical conditions before the formation of SWVs are effective indicators of the subsequent evolution of the vortex and associated severe weathers. Moreover, a further level of classification was also constructed for Type II SWVs, which accounted for the largest proportion out of Types I–IV, and the results indicated that the lifespan, radius and maximum 6-h precipitation were all closely related to the intensity of precipitation before the formation of SWVs.

关键词： southwest vortex severe weather vertical stretching

Effects of Vertical Wind Shear on the Pre-Summer Heavy Rainfall Budget:A Cloud-Resolving Modeling Study

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Atmospheric and Oceanic Science Letters 2013年第1期6卷 44-51页

作者： shen xin-yong QING Tao HUANG Wen-Yan LI Xiao-Fan Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology National Oceanic and Atmospheric Administration/National Environmental Satellite Dataand Information Service/Center for Satellite Applications and ResearchCamp SpringsMarylandUSA

This study investigates the effects of vertical wind shear on the torrential rainfall response to the large-scale forcing using a rainfall separation analysis of a pair of two-dimensional cloud-resolving model sensitivity experiments for a pre-summer heavy rainfall event over southern China from 3-8 June 2008 coupled with National Centers for Environmental Prediction(NCEP)/Global Data Assimilation System(GDAS) *** rainfall partitioning analysis based on the surface rainfall budget indicates that the exclusion of vertical wind shear decreases the contribution to total rainfall from the largest contributor,which is the rainfall associated with local atmospheric drying,water vapor divergence,and hydrometeor loss/convergence,through the reduction of the rainfall area and reduced rainfall during the rainfall *** removal of vertical wind shear increases the contribution to total rainfall from the rainfall associated with local atmospheric drying,water vapor convergence,and hydrometeor loss/convergence through the expansion of the rainfall area and enhanced *** elimination of vertical wind shear enhances heavy rainfall and expands its area,whereas it reduces moderate rainfall and its area.

关键词： cloud-resolving model simulation vertical wind shear rainfall partitioning surface rainfall budget

Estimation of Chloride Diffusivity in Hydrated Tricalcium Silicate Using a Hydration-Diffusion Integrated Method

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Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 49-64页

作者： WANG xin shen Dejian TAO Sijie LIU Ruixin WU shengxing College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China

This study aims to develop a chloride diffusion simulation method that considers the hydration microstructure and pore solution properties during the hydration of tricalcium silicate(C3S).The method combines the hydration simulation,thermodynamic calculation,and finite element analysis to examine the effects of pore solution,including effect of electrochemical potential,effect of chemical activity,and effect of mechanical interactions between ions,on the chloride effective diffusion coefficient of hydrated C3S *** results indicate that the effect of electrochemical potential on chloride diffusion becomes stronger with increasing hydration age due to the increase in the content of hydrated calcium silicate;as the hydration age increases,the effect of chemical activity on chloride diffusion weakens when the number of diffusible elements decreases;the effect of mechanical interactions between ions on chloride diffusion decreases with the increase of hydration age.

关键词： tricalcium silicate simulation method chloride diffusion coefficient pore solution

From waste to wealth:Coal tar residue derived carbon materials as low-cost anodes for potassium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 464-475页

作者： Zhonghua Lu Jun shen xin Zhang Lingcong Chao Liang Chen Ding Zhang Tao Wei Shoudong Xu College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China College of Chemistry Taiyuan University of TechnologyTaiyuan 030024China School of Chemical Engineering and Pharmacy Wuhan Institute of TechnologyWuhan 430205China School of Energy and Power Jiangsu University of Science and TechnologyZhenjiang 212003China

Carbon materials are widely recognized as highly promising electrode materials for various energy storage system *** tar residues(CTR),as a type of carbon-rich solid waste with high value-added utilization,are crucially important for the development of a more sustainable *** this study,we employed a straightforward direct carbonization method within the temperature range of 700-1000℃to convert the worthless solid waste CTR into economically valuable carbon materials as anodes for potassium-ion batteries(PIBs).The effect of carbonization temperature on the microstructure and the potassium ions storage properties of CTR-derived carbons(CTRCs)were systematically explored by structural and morphological characterization,alongside electrochemical performances *** on the co-regulation between the turbine layers,crystal structure,pore structure,functional groups,and electrical conductivity of CTR-derived carbon carbonized at 900℃(CTRC-900H),the electrode material with high reversible capacity of 265.6m Ah·g^(-1)at 50 m A·g^(-1),a desirable cycling stability with 93.8%capacity retention even after 100 cycles,and the remarkable rate performance for PIBs were ***,cyclic voltammetry(CV)at different scan rates and galvanostatic intermittent titration technique(GITT)have been employed to explore the potassium ions storage mechanism and electrochemical kinetics of *** indicate that the electrode behavior is predominantly governed by surface-induced capacitive processes,particularly under high current densities,with the potassium storage mechanism characterized by an“adsorption-weak intercalation”*** work highlights the potential of CTR-based carbon as a promising electrode material category suitable for high-performance PIBs electrodes,while also provides valuable insights into the new avenues for the high value-added utilization of CTR.

关键词： coal tar residue carbon materials anode potassium-ion batteries high value-added

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0418号“艾利”台风暴雨过程的数值模拟

台湾海峡 2006年第1期25卷 102-109页

作者：黄永玉沈桐立沈新勇余晖南京信息工程大学大气科学系上海台风研究所上海200030

本文利用中尺度MM5模式模拟了0418号“艾利”台风造成闽东北强降水的一次物理过程.模拟结果表明:充沛的水汽和强烈的上升运动是造成台风暴雨的直接原因,降水与850hPa涡度场、散度场有较好的对应关系.基本流场存在二次切变时,横波型扰动... 详细信息

本文利用中尺度MM5模式模拟了0418号“艾利”台风造成闽东北强降水的一次物理过程.模拟结果表明:充沛的水汽和强烈的上升运动是造成台风暴雨的直接原因,降水与850hPa涡度场、散度场有较好的对应关系.基本流场存在二次切变时,横波型扰动会激发产生并且发生不稳定,从而导致暴雨天气的产生.台风附近相当位温密集陡峭和CAPE值的突增表明台风有加强的可能,CISK和涡旋Rossby波的传播是可能的机制.水汽的敏感性试验结果表明:水汽变化会影响台风的强度和降水的强度,水汽的微小变化可造成降水极大的变化,但对台风的位置影响不大.

关键词：气象学台风暴雨 MM5模式水汽数值试验福建

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多重网格法在MM5自适应模式中的应用

南京气象学院学报 2008年第2期31卷 242-249页

作者：韩雪沈桐立沈新勇南京信息工程大学江苏省气象灾害重点实验室

将多重网格法应用于MM5中来加速自适应网格的生成,并用这种方法来模拟2002年6月17—18日发生在江南和华南的暴雨过程。试验表明:在收敛精度要求高的情况下自适应模式模拟结果的精度高于均匀网格模式,且多重网格法有助于提高运算效率。

关键词：多重网格法自适应网格 MM5 加速迭代收敛

西北地区东部夏季水汽输送特征及其与降水的关系

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干旱区地理 2017年第2期40卷 239-247页

作者：赵光平姜兵王勇沈新勇南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心江苏南京210044 中国科学院大气物理研究所云降水物理与强风暴重点实验室北京100029

采用ERA Interim再分析资料和160站逐月站点降水资料,运用经验正交函数(EOF)分析、合成分析等方法揭示了西北东部3个分区的水汽输送的区域气候特征、与降水EOF气候模态相对应的整层水汽输送特征以及降水偏多(少)年的水汽输送异常特征。... 详细信息

采用ERA Interim再分析资料和160站逐月站点降水资料,运用经验正交函数(EOF)分析、合成分析等方法揭示了西北东部3个分区的水汽输送的区域气候特征、与降水EOF气候模态相对应的整层水汽输送特征以及降水偏多(少)年的水汽输送异常特征。结果表明:西北地区东部夏季经向水汽输送的大值区处于900 h Pa^800 h Pa高度上;纬向水汽输送大值位于700 h Pa^500 h Pa高度上。对西北东部降水做EOF分析,第一模态为全区一致型,与降水相对应的西风影响区主要盛行西风水汽输送,季风边缘区的南部盛行西南风水汽输送;第二模态为东南-西北型,东风、东北风水汽输送流入西北东部地区;第三模态为东北-西南型,西风和西北风水汽输送将水汽带到西风影响区内。

关键词：西北地区东部水汽输送 EOF分析合成分析

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未来全球PM2.5浓度时空变化特征的模拟

中国环境科学 2017年第4期37卷 1201-1212页

作者：杨冬冬赵树云张华沈新勇南京信息工程大学气象灾害预报预警与评估协同创新中心江苏南京210044 国家气候中心中国气象局气候研究开放实验室北京100081

根据政府间气候变化专门委员会第五次评估报告(IPCCAR5)给出的气溶胶及其前体物的不同排放情景RCP2.6(低排放)、RCP4.5(中等排放)和RCP8.5(高排放),利用国家气候中心的气溶胶-气候在线耦合模式,分别模拟了2010~2030和2030~2050年总PM_(2... 详细信息

根据政府间气候变化专门委员会第五次评估报告(IPCCAR5)给出的气溶胶及其前体物的不同排放情景RCP2.6(低排放)、RCP4.5(中等排放)和RCP8.5(高排放),利用国家气候中心的气溶胶-气候在线耦合模式,分别模拟了2010~2030和2030~2050年总PM_(2.5)(人为和自然PM_(2.5)的总和)及其中人为和自然气溶胶柱含量的时空变化,并预估了的绿色排放情景RCP4.5下中国地区人为和自然气溶胶对总PM_(2.5)浓度变化的贡献.结果表明,在3种排放情景下,2010~2030年PM_(2.5)柱含量变化的空间分布基本相似.在欧洲、北非及其西侧的洋面上,PM_(2.5)呈现不同程度的增加,其中以北非及其西侧的洋面上的增加最为明显,而阿拉伯半岛东部PM_(2.5)则明显减少.在RCP4.5排放情景下,中国地区年均PM_(2.5)地表浓度的减少量约为2.55μg/m^3,其中人为气溶胶的贡献约为28%,自然气溶胶的贡献约为72%.2030~2050年,3种排放情景下PM_(2.5)柱含量变化的空间分布差异较大,在RCP4.5和RCP8.5放情景下,非洲北部及其西侧洋面的PM_(2.5)显著增加,而东亚地区的PM_(2.5)显著减少,而RCP2.6排放情景与前2种情景的结果区别很大.在RCP4.5排放情景下,中国地区PM_(2.5)及其中人为和自然气溶胶均在2010~2030年的基础上进一步减少,而且人为气溶胶在其中的贡献(约为34%)也有所增加.

关键词： PM2.5 人为气溶胶自然气溶胶 BCC_AGCM2.0_CUACE/Aero