检索结果-南通市图书馆

Recent Enhanced Deep Troposphere-to-Stratosphere Air Mass Transport Accompanying the Weakening Asian Monsoon

Journal of Meteorological Research 2024年第4期38卷 708-719页

作者： Bin CHEN Jianzhong MA Wei ZHANG Jianchun BIAN tianliang zhao Xiangde XU State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing100081China Department of Plants Soils and ClimateUtah State UniversityUT84322USA Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological AdministrationNanjing University of Information Science&TechnologyNanjing 210044China

The Asian monsoon(AM) region is a well-known region with prevailing stratosphere–troposphere exchange(STE).However,how the STE across this region changes with the weakening AM remains ***,we particularly diagnose the air mass transport between the planetary boundary layer(PBL) and the stratosphere over the AM region during 1992–2017 using the Lagrangian particle dispersion model FLEXPART based on the ERA-Interim reanalysis *** results show that both the downward and upward deep STEs exhibit a detectable increasing trend,while the latter,namely,the deep troposphere-to-stratosphere transport(DTST),is relatively more *** analysis reveals that the long-term trend of DTST over the AM region could be partly attributed to changes in the Pacific Walker circulation and the air temperature(especially at upper levels).Additionally,it is found that DTST increases markedly over the tropical oceanic regions,while the increasing DTST into the stratosphere can be attributed to the enhanced air masses originated from the PBL over the terrestrial regions,where large amounts of pollutant emissions *** results imply that the influence of the DTST on the chemical composition and the climate of the stratosphere over the AM region is expected to become increasingly important,and is thereby of relevance to climate projection in an evolving climate.

关键词： stratosphere–troposphere exchange(STE) air mass transport deep troposphere-to-stratosphere transport(DTST) Asian monsoon(AM) 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

Distribution and Formation Causes of PM_(2.5) and O_(3) Double High Pollution Events in China during 2013–20

引用

Advances in Atmospheric Sciences 2024年第6期41卷 1235-1250,I0004-I0021页

作者： Zhixuan TONG Yingying YAN Shaofei KONG Jintai LIN Nan CHEN Bo ZHU Jing MA tianliang zhao Shihua QI Department of Atmospheric Science School of Environmental SciencesChina University of GeosciencesWuhan 430074China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Research Centre for Complex Air Pollution of Hubei Province Wuhan 430074China Laboratory for Climate and Ocean–Atmosphere Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China Eco-Environmental Monitoring Centre of Hubei Province Wuhan 430074China Key Laboratory of Atmospheric Chemistry China Meteorological AdministrationBeijing 100081China School of Atmospheric Physics Nanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China

Fine particulate matter(PM_(2.5))and ozone(O_(3))double high pollution(DHP)events have occurred frequently over China in recent years,but their causes are not completely *** this study,the spatiotemporal distribution of DHP events in China during 2013–20 is *** synoptic types affecting DHP events are identified with the Lamb–Jenkinson circulation classification *** meteorological and chemical causes of DHP events controlled by the main synoptic types are further *** show that DHP events(1655 in total for China during 2013–20)mainly occur over the North China Plain,Yangtze River Delta,Pearl River Delta,Sichuan Basin,and Central *** occurrence frequency increases by 5.1%during 2013–15,and then decreases by 56.1%during 2015–*** main circulation types of DHP events are“cyclone”and“anticyclone”,accounting for over 40%of all DHP events over five main polluted regions in China,followed by southerly or easterly flat airflow types,like“southeast”,“southwest”,and“east”.Compared with non-DHP events,DHP events are characterized by static or weak wind,high temperature(20.9℃ versus 23.1℃)and low humidity(70.0%versus 64.9%).The diurnal cycles of meteorological conditions cause PM_(2.5)(0300–1200 LST,Local Standard Time=UTC+8 hours)and O_(3)(1500–2100 LST)to exceed the national standards at different periods of the DHP *** pollutant conversion indices further indicate the rapid secondary conversions during DHP events,and thus the concentrations of NO_(2),SO_(2) and volatile organic compounds decrease by 13.1%,4.7%and 4.4%,*** results of this study can be informative for future decisions on the management of DHP events.

关键词： double high pollution events PM_(2.5) ozone spatiotemporal distribution meteorological causes chemical composition characteristics

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

2015—2022年荆州市O_(3)污染特征及其源区分析

引用

环境科学学报 2024年第5期44卷 285-298页

作者：杨天顺吴丽晴卢硕赵天良徐建军广东海洋大学海洋与气象学院湛江524000 广东海洋大学深圳研究院深圳518120 广东海洋大学南海海洋气象研究院湛江524000 中国气象局雄安大气边界层开放实验室雄安新区071899 中国气象局气溶胶与云降水重点开放实验室南京210044

利用湖北省荆州市2015—2022年O_(3)站点观测数据和气象要素数据,分析了该地区O_(3)污染特征及O_(3)浓度与近地面气温、相对湿度、降水量、日照时数和风场的关系,并利用后向轨迹模型进行了源区分析.结果表明,2015—2020年荆州市O_(3)浓... 详细信息

利用湖北省荆州市2015—2022年O_(3)站点观测数据和气象要素数据,分析了该地区O_(3)污染特征及O_(3)浓度与近地面气温、相对湿度、降水量、日照时数和风场的关系,并利用后向轨迹模型进行了源区分析.结果表明,2015—2020年荆州市O_(3)浓度呈下降趋势(其中,2017年年均浓度较低),但近两年(2021—2022年)O_(3)浓度显著上升.荆州市O_(3)浓度与气象要素的相关性分析表明,O_(3)浓度与近地面温湿度相关最强,尤其在高温低湿(RH≤60%、温度超过30℃)的条件下易出现O_(3)浓度高值.此外,研究发现风场对O_(3)浓度有重要影响:荆州市O_(3)浓度分布与风场密切相关且季节差异显著.春季在偏南风(风速为2~5 m·s^(-1))情况下易出现O_(3)浓度高值;夏、秋两季O_(3)浓度高值则多出现在偏东风(风速小于3 m·s^(-1))情况下.由气团轨迹后向模拟、浓度权重轨迹分析法(CWT)和潜在源贡献因子分析方法(PSCF)的分析结果可知,不同季节荆州市O_(3)源区分布特征存在差异.春季贡献高值区主要位于荆州以南地区和湖北省东部地区;夏季主要源区分布于荆州东北方向,包括武汉周边地区、河南省郑州、驻马店及其南部地区;秋季源区分布以偏东方向为主,主要为湖北省东部和豫皖交界地区.

关键词： O_(3) 溯源分析气象要素荆州

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

Long range trans-Pacific transport and deposition of Asian dust aerosols

引用

Journal of Environmental Sciences 2008年第4期20卷 424-428页

作者： HAN Yongxiang FANG Xiaomin zhao tianliang KANG Shichang Lanzhou Arid Meteorological Institute and Key Laboratory of Arid Climatic Change and Reducing Disaster China Meteorological Administration Lanzhou 730020 China Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100085 China Air Quality Research Branch Meteorological Service of Canada Toronto Ontario m3H 5T4 Canada

The deposition of Asian dust aerosols during their trans-Pacific transport might cause significant marine phytoplankton biomass increases. However, the knowledge of the trans-Pacific dust transport, deposition, and spatial distribution is still poor due to a lack of continuous and simultaneous observations in the Asian subcontinent, the north Pacific Ocean, and North America. The severe Asian dust storm during 6 to 9 April 2001 provided an opportunity to gain a better understanding of trans-Pacific dust transport and deposition, using a comprehensive set of observations from satellites, ground-based light detection and ranging, aircraft, and surface observation networks. The observations and model simulations outline the general pattern of dust transport, deposition, vertical profile, and spatial distribution. The following points were observed：（1） the surface dust concentrations decreased exponentially with the increasing dust transport distance from 80°E to 120°W along the transport pathway; （2） the altitude of the dust concentration peak increased with increasing transport distance in the north Pacific region; and （3） the spatial distribution of dust deposition mainly depended on the trans-Pacific transport route.

关键词： dust aerosol trans-Pacific dust transport and deposition spatial distribution

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

Effect of molybdenum content on the microstructure and corrosion behavior of FeCoCrNiMox high-entropy alloys

引用

Journal of Materials Science & Technology 2020年第11期42卷 64-73页

作者： Chunduo Dai tianliang zhao Cuiwei Du Zhiyong Liu Dawei Zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Key Laboratory for Corrosion and Protection of The Ministry of Education(MOE) Beijing 100083China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Materials Genome Institute of Shanghai University Shanghai 200444China

The effect of Mo content on the microstructure revolution and corrosion behavior of cast FeCoCrNiMox high-entropy alloys in chloride environments were *** indicate that FeCoCrNi and FeCoCrNiMo0.1 alloys are in single FCC solid *** precipitates form in FeCoCrNiMo0.3 and increase in FeCoCrNiMo0.6 *** occurs on FeCoCrNi and FeCoCrNiMo0.1 alloys while FeCoCrNiMo0.3 and FeCoCrNiMo0.6 alloys suffer from preferential localized corrosion at the regions depleted in Cr and *** higher Cr2O3/Cr(OH)3 ratio and the incorporation of Mo oxides make the passive film more protective and the corrosion resistance of the FeCoCrNiMo0.1 alloy is thus *** correlation between microstructure and corrosion behavior and the corresponding corrosion mechanism were clarified.

关键词： High-entropy alloys Corrosion behavior Precipitate

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

长三角地区2004-2022年NO_(2)柱浓度演变特征及其主要影响因素分析

引用

环境科学研究 2024年第5期37卷 950-962页

作者：沈利娟刁一伟贾浩博王红磊施双双赵天良无锡学院大气与遥感学院江苏无锡214105 无锡学院中国气象局生态系统碳源汇重点开放实验室江苏无锡214105 南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室江苏南京210044

为研究长三角地区NO_(2)柱浓度长期的时间演变特征及其影响因素,利用OMI卫星观测的NO_(2)柱浓度数据、GPM降雨数据、MERRA-2再分析数据和社会经济数据,结合地面NO_(2)浓度数据,分析了卫星数据与地面观测数据的一致性以及NO_(2)柱浓度的... 详细信息

为研究长三角地区NO_(2)柱浓度长期的时间演变特征及其影响因素,利用OMI卫星观测的NO_(2)柱浓度数据、GPM降雨数据、MERRA-2再分析数据和社会经济数据,结合地面NO_(2)浓度数据,分析了卫星数据与地面观测数据的一致性以及NO_(2)柱浓度的年际、月际和季节性变化特征及其主要影响因素.结果表明:①OMI卫星观测的NO_(2)柱浓度与地面观测的NO_(2)浓度一致性较好,能够较好地反映地面NO_(2)浓度分布及其时间变化特征.②长三角地区2004-2022年NO_(2)柱浓度高值主要集中在南京、常州、无锡、苏州、上海和杭州等核心城市地区;NO_(2)柱浓度年际变化呈波动变化趋势,可分为2个阶段,2004-2011年为增加阶段,年均变化率为0.68%,2011-2022年为降低阶段,年均变化率为-4.51%.2011年NO_(2)柱浓度达最大值〔(12.63×10^(15)±9.16×10^(15))molec/cm^(2)〕,2022年达到最小值,仅为(7.16×10^(15)±4.80×10^(15))molec/cm^(2).③受气象条件和排放源的影响,导致NO_(2)柱浓度存在明显的月际和季节性变化,呈冬季>春季≈秋季>夏季的特征,其中12月〔(20.20×10^(15)±8.89×10^(15))molec/cm^(2)〕最高,7月〔(4.81×10^(15)±1.72×10^(15))molec/cm^(2)〕最低.④长三角地区NO_(2)柱浓度的长期演变特征受社会经济因素的影响.第二产业中的燃煤源和第三产业中交通运输对NO_(2)柱浓度的影响较大,机动车排放是长三角地区核心城市群对流层NO_(2)的重要来源.研究显示,2004-2022年随着一系列大气污染防治措施的执行,长三角地区在经济快速发展的同时NO_(2)柱浓度持续降低,充分证明了经济发展与环境保护可以实现良性互动.

关键词：长三角地区 NO_(2)柱浓度时间演变影响因素社会经济因素

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

Extreme precipitation events in East China and associated moisture transport pathways

引用

Science China Earth Sciences 2016年第9期59卷 1854-1872页

作者： zhao Yang XU XiangDe zhao tianliang XU HongXiong MAO Fei SUN Han WANG YuHong State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science & Technology Nanjing 210044 China Institute of Ecological Environment and Agricultural Meteorology Chinese Academy of Meteorological Sciences Beijing 100081 China Guangxi Institute of Meteorological Disaster Mitigation Nanning 530022 China

Interannual variation of summer precipitation in East China, and frequency of rainstorms during the monsoon season from 1961 to 2010, are analyzed in this study. It is found that the two variables show opposite trends on a decadal time scale: frequency of rainstorms increases significantly after the 1990 s, while summer precipitation in East China decreases during the same period. Analysis of the spatial distribution of summer rainstorm frequency from 1961 to 2010 indicates that it decreases from the southeast to the northwest at the east edge of the large-scale topography associated with the plateaus. Spatial distribution of rainstorms with daily rainfall greater than 50 mm is characterized by a "high in the southeast and low in the northwest" pattern, similar to the staircase distribution of the topography. However, the spatial distribution of variation in both summer precipitation and frequency of extreme rainstorms under global warming differs significantly from the three-step staircase topography. It is shown that moisture characteristics of summer precipitation and extreme rainstorms during the monsoon season in East China, including moisture transport pathways, moist flow pattern, and spatial structure of the merging area of moist flows, differ significantly. Areas of frequent rainstorms include the Yangtze River Valley and South China. Column-integrated moisture transport and its spatial structure could be summarized as a "merging" of three branches of intense moist flows from low and middle latitude oceans, and "convergence" of column-integrated moisture fluxes. The merging area for moist flow associated with rainstorms in the high frequency region is located slightly to the south of the monsoonal precipitation or non-rainstorm precipitation, with significantly strong moisture convergence. In addition, the summer moist flow pattern in East China has a great influence on the frequency of extreme rainstorms. Moisture flux vectors in the region of frequent rai

关键词： Frequency of rainstorms Moisture transport Synoptic circulation Extreme rainstorms Synchronized variations Vortex structure

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

Dust direct radiative effects on the earth-atmosphere system over east Asia:Early spring cooling and late spring warming

引用

Chinese Science Bulletin 2011年第10期56卷 1020-1030页

作者： WANG Hong zhao tianliang ZHANG XiaoYe GONG SunLing Centre for Atmosphere Watch and Services Chinese Academy of Meteorological Sciences Beijing 100081 China Air Quality Research Division Science & Technology Branch Environment Canada Toronto Ontario M3H 5T4 Canada

Focusing on three dust storms occurring in spring 2001,we developed a detailed aerosol parameterization scheme and integrated it in a radiative transfer model to characterize possible impacts of solar altitude angle on dust direct radiative effects over China desert regions and the North Pacific,using actual daily solar altitude *** solar altitude angle from early spring (or winter) to late spring (or summer) leads to increase of positive clear sky radiative forcing,and decrease of negative radiative forcing due to dust aerosols at the top of the *** solar altitude angle increases from early to late spring,dust-clear sky radiative forcing may change from negative to positive at the top of atmosphere,showing a change from cooling to heating of the earth-atmosphere system over high-albedo deserts and nearby *** low-albedo ocean negative clear sky radiative forcing by dust may decrease,suggesting a change from strong to weak cooling on the earth-atmosphere *** impacts of solar altitude angle on cloudy sky radiative forcing due to dust are similar to those of clear *** of low cloud on dust radiative forcing are the same as increasing surface *** causes the transition of dust cooling effects into heating effects over deserts to occur earlier,and causes decrease of negative radiative forcing over the ocean and even cause a change from weak negative radiative forcing to weak positive forcing over local *** in the same East Asian desert regions and nearby areas,the strength and sign of the radiative forcings depend on storm dates and thus solar altitude *** nearer to early spring (or winter) a dust storm occurs,the easier it leads to negative radiative forcing at the top of atmosphere,which indicates cooling effects on the earth-atmosphere *** contrast,the nearer to late spring (or summer) a dust storm occurs,the easier it leads to positive radiative forcing at the top of atmosphere,showing heat

关键词：大气系统辐射效应冷却效果东亚地区气候变暖粉尘层地球早春

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

Facies Architecture Model of the Shimentan Formation Pyroclastic Rocks in the Block-T Units, Xihu Sag, East China Sea Basin, and its Exploration Significance

引用

Acta Geologica Sinica(English Edition) 2019年第4期93卷 1076-1087页

作者： DAI Xiaojuan TANG Huafeng ZHANG Tao zhao Pengjiu XU Chunming KONG Tan zhao tianliang WANG Pujun Collegeof Earth Sciences Jilin UniversityChangchun130061China Key Laboratory of Mineral Resources Evaluation in Northeast Asia Ministry of Land and ResourcesChangchun 130061China Key Lab for Evolution of Past life and Environment in Northeast Asia Ministry of EducationChangchun 130026China Shanghai Branch of CNOOC Ltd. Shanghai 200030China

A gas field consisting of volcanic reservoir rocks was discovered in the block-T units of the Xihu Sag,East China Sea *** lithology of the volcanic rocks is dominated by tuff and reworked *** lithofacies are dominated by base surge deposits of explosive *** the architecture model of volcanic facies is still uncertain,it has restricted the exploration and development of mineral resources in this *** core and cuttings data,the lithology,lithofacies,geochemistry as well as grain size characteristics of volcanic rocks were *** on these analyses,the volcanic rocks in the well section are divided into three eruptive *** transport direction of each volcanic eruption is analyzed using crystal fragment size *** facies architecture of the block-T units was established based on the reconstruction results of *** results show that the drilling reveals proximal facies(PF)and distal facies(DF)of the volcanic ***,the crater-near crater facies(CNCF)are not *** with the reservoirs of the Songliao Basin,it is shown that the volcanic rocks in the Xihu Sag have good exploration potential;a favorable target area is the CNCF near the contemporaneous fault.

关键词： volcanic rocks Shimentan Formation facies architecture eruptive stage East China Sea Basin

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

基于深度强化学习的无人驾驶路径规划研究

引用

河北工业大学学报 2024年第4期53卷 21-30页

作者：赵天亮张小俊张明路陈建文河北工业大学机械工程学院天津300401

针对深度确定性策略梯度(Deep Deterministic Policy Gradient,DDPG)算法在训练神经网络时出现收敛不稳定、学习效率低等问题,提出了一种基于奖励指导的深度确定性策略梯度(Reward Guidance DDPG,RG_DDPG)算法。该算法在回合内创建优秀... 详细信息

针对深度确定性策略梯度(Deep Deterministic Policy Gradient,DDPG)算法在训练神经网络时出现收敛不稳定、学习效率低等问题,提出了一种基于奖励指导的深度确定性策略梯度(Reward Guidance DDPG,RG_DDPG)算法。该算法在回合内创建优秀经验集合,便于指导智能汽车充分利用过往有效信息,得到稳定的控制策略;采用基于奖励的优先经验回放机制,打破数据之间的关联性,提高数据的利用率,减少搜索过程的盲目性,提高算法的收敛稳定性。基于ROS(Robot Operating System)操作系统对算法进行了验证。在Gazebo建模软件中,设计了智能汽车模型以及障碍物环境,利用决策算法规划智能汽车的安全行驶路径。数据结果验证了RG_DDPG算法在处理路径规划任务的有效性,相比于DDPG算法,改进后智能汽车的车速能够提升60.5%,获取奖励提升一倍多,算法的收敛稳定性更好。最后通过实车实验验证了该算法的实用性。

关键词：智能汽车无人驾驶路径规划深度确定性策略梯度奖励指导

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：