检索结果-南通市图书馆

High-resolution Simulation Dataset of Hourly PM_(2.5)Chemical Composition in China(CAQRA-aerosol)from 2013 to 2020

Advances in Atmospheric Sciences 2025年第4期42卷 697-712页

作者： Lei KONG Xiao TANG Jiang ZHU Zifa WANG Bing liu Yuanyuan ZHU Lili ZHU Duohong CHEN Ke HU Huangjian WU Qian WU Jin SHEN Yele SUN zirui liu Jinyuan XIN Dongsheng JI Mei ZHENG Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China China National Environmental Monitoring Centre Beijing 100012China Guangdong Ecological Environment Monitoring Centre Guangzhou 510308China Wuhan Environmental Monitoring Centre Hubei 430015China Hubei Province Academy of Eco-environmental Sciences Hubei 430072China Peking University Beijing 100871China

Scientific knowledge on the chemical compositions of fine particulate matter(PM_(2.5)) is essential for properly assessing its health and climate effects,and for decisionmakers to develop efficient mitigation strategies.A high-resolution PM_(2.5) chemical composition dataset(CAQRA-aerosol)is developed in this study,which provides hourly maps of organic carbon,black carbon,ammonium,nitrate,and sulfate in China from 2013 to 2020 with a horizontal resolution of 15 *** paper describes the method,access,and validation results of this *** shows that CAQRA-aerosol has good consistency with observations and achieves higher or comparable accuracy with previous PM_(2.5) composition *** on CAQRA-aerosol,spatiotemporal changes of different PM_(2.5) compositions were investigated from a national viewpoint,which emphasizes different changes of nitrate from other *** estimated annual rate of population-weighted concentrations of nitrate is 0.23μg m^(−3)yr^(−1) from 2015 to 2020,compared with−0.19 to−1.1μg m^(−3)yr^(−1) for other *** whole dataset is freely available from the China Air Pollution Data Center(https://***/10.12423/capdb_***).

关键词： PM_(2.5)composition dataset black carbon organic carbon ammonium nitrate sulfate

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

基于推荐机制的SCIR信息传播模型分析

引用

情报理论与实践 2025年第1期48卷 176-183页

作者：刘梓锐陈梓彦袁得嵛中国人民公安大学信息网络安全学院北京100038

[目的/意义]近年来,随着在线社交平台的出现,信息传播发生了迅速的变化。在线社交平台为了提供高质量的内容以及促进信息传播,应用了各种推荐机制,因此信息传播途径不同于以往的拓扑结构传播。把握推荐机制下的信息传播特点,有利于实现... 详细信息

[目的/意义]近年来,随着在线社交平台的出现,信息传播发生了迅速的变化。在线社交平台为了提供高质量的内容以及促进信息传播,应用了各种推荐机制,因此信息传播途径不同于以往的拓扑结构传播。把握推荐机制下的信息传播特点,有利于实现对谣言等信息的有效管控。[方法/过程]提出基于拓扑结构和推荐机制的SCIR信息传播模型,从理论上深入研究传播节点最终传播用户数量和概率。通过一系列的数值模拟,研究传播节点、点赞概率和收藏概率、创作概率等因素的影响。[结果/结论]有了推荐机制,谣言可以在社交网络中快速传播,但点赞、收藏等行为概率的提升并非会使传播效果更好,反而有可能阻碍传播。[局限]只考虑了信息传播模型中一种特定的推荐机制。今后的研究可以综合考虑不同推荐机制的具体影响,从而构建普适的基于推荐机制的信息传播模型。

关键词：在线社交平台信息传播模型推荐机制用户行为

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

Preface to the Special Issue on Atmospheric Oxidation Capacity,Ozone,and PM_(2.5)Pollution:Quantification Methods,Formation Mechanisms,Simulation,and Control

引用

Advances in Atmospheric Sciences 2021年第7期38卷 1051-1052页

作者： Yuesi WANG zirui liu State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

The atmospheric oxidation capacity(AOC)is the essential driving force of atmospheric chemistry in forming complex air pollution,which determines the removal rate of trace gases and the production rates of secondary *** processes and rates of species being oxidized in the atmosphere thus constitute the key factors to quantify the AOC.

关键词： driving gases pollution

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

Spatiotemporal characteristics of ultraviolet solar radiation in China

引用

Atmospheric and Oceanic Science Letters 2019年第4期12卷 302-304页

作者： HU Bo liu Hui liu zirui State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Shaanxi Provincial Meteorological Observatory Shaanxi Meteorology AdministrationXi'anChina

UV radiation plays an important role in climate change and photochemical reactions,and in Ecosystem *** this study,the authors presented study results of China’s National Basic Research Program Study on the climatic characteristics and reconstruction method of UV radiation in *** spatiotemporal variation of UV radiation in China has been discussed,and then an effcient modeling method has been established to obtain history UV radiation data to analyse the variation trends of UV radiation in ***,the influence of aerosol,cloud,ozone,and water vapor on UV radiation has been discussed.

关键词： Ultraviolet radiation reconstruction model aerosol optical depth trends

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

Seasonal variation and sources of derivatized phenols in atmospheric fine particulate matter in North China Plain

引用

Journal of Environmental Sciences 2020年第3期32卷 136-144页

作者： Yang Yang Xingru Li Rongrong Shen zirui liu Dongsheng Ji Yuesi Wang Department of Chemistry Analytical and Testing CenterCapital Normal UniversityBeijing100048China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China

Qualitative and quantitative analyses of derivatized phenols in Beijing and in Xinglong were performed from 2016 to 2017 using gas chromatography-mass *** results showed substantially more severe pollution in *** the 14 compounds detected,the total average concentration was 100 ng/m^3 in Beijing,compared with 11.6 ng/m^3 in *** specifically,concentration of nitro-aromatic compounds(NACs)(81.9 ng/m^3 in Beijing and 8.49 ng/m^3 in Xinglong) was the highest,followed by aromatic acids(14.6 ng/m^3 in Beijing and 2.42 ng/m^3 in Xinglong) and aromatic aldehydes(3.62 ng/m^3 in Beijing and 0.681 ng/m^3 in Xinglong).In terms of seasonal variation,the highest concentrations were found for 4-nitrocatechol in winter in Beijing(79.1±63.9 ng/m^3) and 4-nitrophenol in winter in Xinglong(9.72±8.94 ng/m^3).The analysis also revealed diurnal variations across different *** compounds presented higher concentrations at night in winter because of the decreased boundary layer height and increased heating *** some presented higher levels during the day,which attributed to the photo-oxidation process for summer and more biomass burning activities for *** concentrations appeared in winter and autumn than in spring and summer,which resulted from more coal combustions and adverse meteorological *** significant correlations among NACs indicated similar sources of *** correlations presented within each subgroup than those between the *** correlations between levoglucosan and nitrophenols,nitrocatechols,nitro salicylic acids,with correlation coefficients(r) of 0.66,0.69 and 0.69,respectively,indicating an important role of biomass burning among primary sources.

关键词： Derivated phenols Diurnal and seasonal variations Correlation analysis North China plain PM2.5

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

黄土边坡微生物矿化加固及植被恢复试验

引用

水土保持研究 2025年第1期32卷 227-234,242页

作者：雷磊王良樊成虎刘子瑞宋洋薛倩楠田堪良段金贵国网陕西省电力有限公司电力科学研究院西安710100 国网(西安)环保技术中心有限公司西安710100 国网陕西省电力有限公司西安710100 国网陕西省电力有限公司安康水力发电公司陕西安康725009 国网陕西省电力有限公司西安供电公司西安710048 西北农林科技大学水土保持研究所陕西杨凌712100 中国科学院水利部水土保持研究所陕西杨凌712100 黄河水利委员会西峰水土保持科学试验站甘肃庆阳745000

[目的]研究黄土边坡微生物矿化加固及植被恢复,为黄土边坡的加固及坡面土壤侵蚀防治提供新方法和新技术。[方法]采用微生物诱导碳酸钙沉淀(Microbially Induced Calcite Precipitation,MICP)技术对黄土边坡进行矿化加固处理,并在固化黄... 详细信息

[目的]研究黄土边坡微生物矿化加固及植被恢复,为黄土边坡的加固及坡面土壤侵蚀防治提供新方法和新技术。[方法]采用微生物诱导碳酸钙沉淀(Microbially Induced Calcite Precipitation,MICP)技术对黄土边坡进行矿化加固处理,并在固化黄土边坡上进行植被恢复,利用扫描电子显微镜(SEM)和光学显微镜,从微观角度探究MICP技术对黄土边坡矿化加固的作用机制,并统计分析了固化黄土边坡的植被恢复效果。[结果]采用MICP技术对黄土边坡进行固化处理后,在坡面上生成的固化层将松散且相邻的土壤颗粒胶结在一起,使黄土坡面形成一个整体,固化层最大厚度为0.23 cm,平均厚度为0.21 cm;固化黄土边坡恢复植被后第60天,A1,A2,B1,B2,A1B1,A2B2各区域内植被成活率比A0,B0,A0B0各区域分别显著提高26.66%,20%,37.5%,25%,33.33%,25%(p<0.05),第60天后,各区域内植被的成活率均差异显著,而且固化后加保水剂的A1,B1,A1B1各区域内植被的成活率最高;固化后加保水剂的B1和A1B1区域内紫穗槐高度和地径的生长变化量最大,且固化后加保水剂的A1,B1,A1B1各区域内麦冬草和紫穗槐的生长状况最好。[结论]采用MIC技术可以有效固化黄土坡面,与植被恢复技术相结合,既能防治土壤侵蚀,又能恢复生态环境。这种综合防治措施为黄土边坡水土流失防治与生态修复提供了良好的技术支持。

关键词：黄土边坡微生物矿化加固技术植被恢复边坡防护

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

Simulating Aerosol Size Distribution and Mass Concentration with Simultaneous Nucleation,Condensation/Coagulation, and Deposition with the GRAPES–CUACE

引用

Journal of Meteorological Research 2018年第2期32卷 265-278页

作者： Chunhong ZHOU Xiaojing SHEN zirui liu Yangmei ZHANG Jinyuan XIN State Key Laboratory of Severe Weather/Key Laboratory of Atmospheric Chemistry of China Meteorological Administration Chinese Academy of Meteorological Sciences Beijing 100081 Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 Jiangsu Collaborative Innovation Center of Climate Change Nanjing 210093

A coupled aerosol–cloud model is essential for investigating the formation of haze and fog and the interaction of aerosols with clouds and precipitation. One of the key tasks of such a model is to produce correct mass and number size distributions of aerosols. In this paper, a parameterization scheme for aerosol size distribution in initial emission,which took into account the measured mass and number size distributions of aerosols, was developed in the GRAPES–CUACE [Global/Regional Assimilation and Pr Ediction System–China Meteorological Administration（CMA） Unified Atmospheric Chemistry Environment model]—an online chemical weather forecast system that contains microphysical processes and emission, transport, and chemical conversion of sectional multi-component aerosols. In addition, the competitive mechanism between nucleation and condensation for secondary aerosol formation was improved, and the dry deposition was also modified to be in consistent with the real depositing length. Based on the above improvements, the GRAPES–CUACE simulations were verified against observational data during 1–31 January 2013, when a series of heavy regional haze–fog events occurred in eastern China. The results show that the aerosol number size distribution from the improved experiment was much closer to the observation, whereas in the old experiment the number concentration was higher in the nucleation mode and lower in the accumulation mode. Meanwhile, the errors in aerosol number size distribution as diagnosed by its sectional mass size distribution were also reduced. Moreover, simulations of organic carbon, sulfate, and other aerosol components were improved and the overestimation as well as underestimation of PM2.5 concentration in eastern China was significantly reduced,leading to increased correlation coefficient between simulated and observed PM2.5 by more than 70%. In the remote areas where bad simulation results were produced previously, the correlation coefficient grew fr

关键词： GRAPES-CUACE number size distribution sectional multi-components aerosol

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

High-resolution Simulation Dataset of Hourly PM2.5 Chemical Composition in China（CAQRA-aerosol） from 2013 to 2020

引用

Advances in Atmospheric Sciences 2025年第4期 697-712页

作者： Lei KONG Xiao TANG Jiang ZHU Zifa WANG Bing liu Yuanyuan ZHU Lili ZHU Duohong CHEN Ke HU Huangjian WU Qian WU Jin SHEN Yele SUN zirui liu Jinyuan XIN Dongsheng JI Mei ZHENG Institute of Atmospheric Physics Chinese Academy of Sciences University of Chinese Academy of Sciences China National Environmental Monitoring Centre Guangdong Ecological Environment Monitoring Centre Wuhan Environmental Monitoring Centre Hubei Province Academy of Eco-environmental Sciences Peking University

Scientific knowledge on the chemical compositions of fine particulate matter(PM2.5) is essential for properly assessing its health and climate effects, and for decisionmakers to develop efficient mitigation strategies. A high-resolution PM2.5chemical composition dataset（CAQRA-aerosol） is developed in this study, which provides hourly maps of organic carbon,black carbon, ammonium, nitrate, and sulfate in China from 2013 to 2020 with a horizontal resolution of 15 km. This paper describes the method, access, and validation results of this dataset. It shows that CAQRA-aerosol has good consistency with observations and achieves higher or comparable accuracy with previous PM2.5composition datasets. Based on CAQRA-aerosol, spatiotemporal changes of different PM2.5compositions were investigated from a national viewpoint,which emphasizes different changes of nitrate from other compositions. The estimated annual rate of population-weighted concentrations of nitrate is 0.23 μg m-3yr-1from 2015 to 2020, compared with-0.19 to -1.1 μg m-3yr-1for other compositions. The whole dataset is freely available from the China Air Pollution Data Center（https://***/10.12423/capdb＿***）.

关键词：

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

Characterization and source identification of submicron aerosol dur ing ser ious haze pollution periods in Beijing

引用

Journal of Environmental Sciences 2022年第2期34卷 25-37页

作者： Peng Xu Yuan Yang Junke Zhang Wenkang Gao zirui liu Bo Hu Yuesi Wang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Resource and Environmental Engineering Guizhou UniversityGuiyang 550025GuizhouChina Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China University of the Chinese Academy of Sciences Beijing 100049China

Submicron aerosol is of extensive concern not only due to its significant impact on air quality but also because it is detrimental to human *** this study,we investigated the characteristics,sources and chemical processes of submicron aerosol based on realtime online measurements of submicron aerosols(NR-PM 1)during December 2015 at an urban site in *** average mass concentration of NR-PM 1 was 92.5±84.9μg/m^(3),the hourly maximum was 459.1μg/m^(3) during the entire *** organic aerosol(OA)(55%)was the largest contributor to NR-PM *** average mass concentration of PAHs was 0.217±0.247μg/m^(3),exhibiting the highest concentration at night and the lowest levels in the *** average mass concentration of organic nitrate was 2.52±2.36μg/m^(3) and that of inorganic nitrate was 7.62±8.22μg/m^(3),accounting for 36%and 64%,respectively,of the total nitrate *** matrix factorization(PMF)differentiated the OA into five chemical components including LV-OOA,SV-OOA,COA,HOA and CCOA,accounting for 22%,16%,13%,25%and 24%respectively,of the total *** average NR-PM 1 mass concentration on the heavy polluted days(HPD)was 182.8±70.2μg/m^(3),which was approximately 9 times that on clean days(CD).The enhanced secondary formation of SNA was evident on HPD,especially the rapid increase of sulfate(23%)and nitrate(19%).

关键词： Haze pollution Submicron aerosol Source apportionment PAHs Organic and inorganic nitrate

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

Characterization of Organic Aerosols in Beijing Using an Aerodyne High-Resolution Aerosol Mass Spectrometer

引用

Advances in Atmospheric Sciences 2015年第6期32卷 877-888页

作者： ZHANG Junke WANG Yuesi HUANG Xiaojuan liu zirui JI Dongsheng SUN Yang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences

Fine particle of organic aerosol （OA）, mostly arising from pollution, are abundant in Beijing. To achieve a better un- derstanding of the difference in OA in summer and autumn, a high-resolution time-of-flight aerosol mass spectrometer （HR- ToF-AMS, Aerodyne Research Inc., USA） was deployed in urban Beijing in August and October 2012. The mean OA mass concentration in autumn was 30 4-30 μg m-3, which was higher than in summer （13 4-6.9 μg m-3）. The elemental anal- ysis found that OA was more aged in summer （oxygen-to-carbon （O/C） ratios were 0.41 and 0.32 for summer and autumn, respectively）. Positive matrix factorization （PMF） analysis identified three and five components in summer and autumn, re- spectively. In summer, an oxygenated OA （OOA）, a cooking-emission-related OA （COA）, and a hydrocarbon-like OA （HOA） were indentified. Meanwhile, the OOA was separated into LV-OOA （low-volatility OOA） and SV-OOA （semi-volatile OOA）; and in autumn, a nitrogen-containing OA （NOA） was also found. The SOA （secondary OA） was always the most important OA component, accounting for 55% of the OA in the two seasons. Back trajectory clustering analysis found that the origin of the air masses was more complex in summer. Southerly air masses in both seasons were associated with the highest OA loading, while northerly air masses were associated with the lowest OA loading. A preliminary study of OA components, especially the POA （primary OA）, in different periods found that the HOA and COA all decreased during the National Day holiday period, and HOA decreased at weekends compared with weekdays.

关键词： organic aerosol aerosol mass spectrometer positive matrix factorization seasonal difference

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：