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Interhemispheric atmospheric mass oscillation and its relation to interannual variations of the Asian monsoon in boreal summer

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science china Earth {2. 2010年第9期53卷 1343-1350页

作者： LU ChuHan, GUAN ZhaoYong & CAI JiaXi Key Laboratory of Meteorological Disaster of Ministry of Education and College of atmospheric sciences, {2. university of information science & technology, {2. 210044, china 1. Key Laboratory of Meteorological Disaster of Ministry of Education and College of atmospheric sciences Nanjing University of Information Science & Technology Nanjing 210044 China

Using NCEP/NCAR reanalysis and precipitation records of Chinese stations, we have investigated the relationship of interhemispheric oscillation of air mass (IHO) with global lower-level circulation and monsoon anomalies in boreal summer. Our results show that the summer IHO explains a greater portion of variance in the abnormal distribution of atmospheric mass over 30°S-60°N as well as the Antarctic. The IHO strongly correlates to the variations of sea level pressure (SLP) in these regions. It is shown that IHO has some influences on both atmospheric mass transports and water vapor fluxes over 30°S-60°N in association with three anomalous cyclonic circulations over land areas of the eastern hemisphere, which is in close relation to the changes in summer monsoon intensity in eastern Asia and western Africa. Composites of summer rainfall anomalies in{2. for high and low IHO-index years indicate that the eastern Asian summer monsoon is more intense, with positive precipitation anomaly centers in northern and northeastern parts of{2., as opposed to the negative center over the mid-lower reaches of the Yangtze River (MLRYR) in stronger IHO years. In weak IHO years, a feeble summer monsoon appears in eastern Asia, leading to positive center of precipitation anomalies displaced into the MLRYR. Furthermore, a teleconnection in wind fields between the western African and eastern Asian monsoon regions was observed in the middle and higher troposphere in the scenario of IHO. The anomalous cyclonic (anticyclonic) circulations along the path of this Africa-East Asia teleconnection were found to be just over the diabatic heating (cooling) centers, suggesting that diabatic forcings are responsible for the formation of this Africa-East Asia teleconnection.

关键词： interhemispheric oscillation Asian monsoon precipitation china boreal summer

Geochemistry of Trace and Rare Earth Elements in Red Soils from the Dongting Lake Area and Its Environmental Significance

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Pedosphere 2009年第5期19卷 615-622页

作者： MAO Long-Jiang MO Duo-Wen YANG jing-Hong SHI Chen-Xi College of atmospheric science Nanjing University of Information Science & Technology Nanjing 210044 (China) College of Urban and Environmental sciences Peking University Beijing 100871 (China) department of Earth sciences Nanjing University Nanjing 210093 (China)

Trace element(TE) and rare earth element(REE) contents in red soils from the Dongting Lake area of china were determined to understanding the provenance and weathering characteristics of the red *** results showed similar REE distribution patterns among red soils from the Dongting Lake area,Xiashu loess from Zhenjiang,loess and Pliocene red soil from the Loess *** patterns implied a similar provenance from dust-storms,except for red soil R5 which formed by bedrock weathering and had significant light REE(LREE) enrichment and heavy REE(HREE) depletion due to longer weathering periods and higher intensity of *** element,especially the Rb/Sr and Li/Ba ratios,and REE,especially the LREE/HREE ratio and δEu could trace weathering *** Rb/Sr,Li/Ba,and LREE/HREE ratios and negative Eu anomalies were present in the red soils from the Dongting Lake *** weathering intensity was in the decreasing order of R5 in the Dongting Lake area > red soils from the Dongting Lake area(including reticulate red soil,weak reticulate red soil,and homogeneous red soil formed by dust storms) > Xiashu loess from Zhenjiang > loess-paleosol and Pliocene red soil from the Loess *** in the TE and REE contents of soil could be effectively used to study the provenance and the weathering intensity.

关键词： Hunan Province provenance sedimentary processes weathering intensity

Distribution and Formation Causes of PM_(2.5) and O_(3) Double High Pollution Events in china during 2.13–2.

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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 {2. 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 2.13–2. 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 2.13–2.)mainly occur over the North china Plain,Yangtze River Delta,Pearl River Delta,Sichuan Basin,and Central *** occurrence frequency increases by 5.1%during 2.13–15,and then decreases by 56.1%during 2.15–*** 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(2..9℃ versus 2..1℃)and low humidity(70.0%versus 64.9%).The diurnal cycles of meteorological conditions cause PM_(2.5)(0300–12.0 LST,Local Standard Time=UTC+8 hours)and O_(3)(1500–2.00 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

Another look at influences of the Madden‐Julian Oscillation on the wintertime East Asian weather

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Another look at influences of the Madden‐Julian Oscillation...

Research and application on the technology system of multi-scale assessment of the impact on the atmospheric environment by urban planning

第2.届中国气象学会年会

作者： Jinhai He,1 Hai Lin,2.and Zhiwei Wu2.1department of atmospheric {2.,nanjing university of information {2. and technology,nanjing,china.2.eteorological Research Division,Environment Canada,Dorval,Quebec,Canada.

As one of the major predictability sources on an intraseasonal time scale,the Madden‐Julian Oscillation（MJO） exerts a profound influence on the subseasonal forecast of the East Asian（EA） surface air temperature（SAT） and *** this study we examine the direct link of the MJO with the EA SAT and precipitation and its dynamical *** represent the MJO,we perform an empirical orthogonal function（EOF） analysis on pentad outgoing longwave radiation（OLR） over（2.°S-2.°N,60°E-150°W）.The EOF1 mode is mostly characterized by a single convection center near the maritime continent（90°-150°E）,whereas the EOF2.mode has an east‐west dipole structure with enhanced convection over the eastern Indian Ocean and suppressed convective activities over the tropical western *** the same pentad of a positive EOF1 phase,large areas of cold anomalies with reduced precipitation emerge in the EA region north of 2.°N and persist through two pentads *** the same pentad of a positive EOF2.phase,SAT and precipitation exhibit a zonal dipole pattern with cold and dry anomalies covering the EA region west of 12.°E and warm and wet anomalies to the *** dipole anomalies in SAT and precipitation systematically move eastward in the next two pentads.A linearized global primitive equation model is utilized to assess the cause of the intraseasonal variability in SAT and precipitation over East Asia associated with the tropical heating of the *** model responses to heating sources that mimic the EOF1 and EOF2.OLR patterns match well the general features of the observed circulation *** forcing of a positive phase of the EOF1 pattern,strengthened local Hadley cell or monsoon circulations within（90°E-150°E） are reproduced,with anomalous northerly winds and dry anomalies prevailing in the lower troposphere over East *** processes that influence East Asia are mainly associated with intraseasonal changes in local Hadley circulation and the Northern Hemisphere

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science china Earth {2. 2005年第Z2期48卷 173-184页

作者： WANG Guangtao, WANG Xiaoyun, MIAO Shiguang, JIANG Weimei, GUO Wenli, JI Chongping & CHEN Xianyan School of Architecture, Tsinghua university, Beijing 100084,{2. Ministry of Construction of{2., Beijing 100044,{2. Beijing Meteorological Bureau, Beijing 100089,{2. institute of Urban meteorology,{2. Meteorological Administration, Beijing 100089,{2. department of atmospheric sciences, nanjing university, nanjing 2.0093,{2. School of Architecture Tsinghua University Beijing 100084 China Ministry of Construction of china Beijing 100044 China School of Architecture Tsinghua University Beijing 100084 China Beijing Meteorological Bureau Beijing 100089 China institute of Urban meteorology China Meteorological Administration Beijing 100089 China department of atmospheric {2. Nanjing University Nanjing 210093 China Beijing Meteorological Bureau Beijing 100089 China

Improvement of the atmospheric environment in urban planning is an important issue to implement the sustainable development of cities. In this paper, in order to meet the demand of planning office to compare and assess quantitatively of the designs in multi-scale, based on geographical information system (GIS) data with high resolution, a multi-scale numerical modeling system for the atmospheric environment impact of urban planning is set up, and the multi-scale assessment index system is established, which compose the technology system of multi-scale assessment of the impact on the atmospheric environment by urban planning. In urban planning (urban development of Beijing) and optimizing layouts of Olympic Green, it has been applied to quantitatively evaluating the impact on atmospheric environment by urban planning before construction, which offers scientific foundation to optimize the whole and local urban layout.

关键词： urban planning, atmospheric environment, multi-scale, numerical simulation, assessment index system.

Improved forecasting via physics-guided machine learning as exemplified using“2.·7”extreme rainfall event in Henan

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science china Earth {2. 2024年第5期67卷 1652-1674页

作者： Qi ZHONG Zhicha ZHANG Xiuping YAO Shaoyu HOU Shenming FU Yong CAO Linguo jing china Meteorological Administration Training Center Beijing 100081China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Zhejiang Meteorological Observatory Hangzhou 310017China Hebei Provincial Weather Modification Center Shijiazhuang 050020China institute of atmospheric Physics Chinese Academy of SciencesBeijing 100029China National Meteorological Center Beijing 100081China School of Computer science Chengdu University of Information TechnologyChengdu 610225China

As a natural disaster,extreme precipitation is among the most destructive and influential,but predicting its occurrence and evolution accurately is very challenging because of its rarity and *** the example of the“2.·7”extreme precipitation event(17–2. July 2.2.)in Henan Province,this study explores the potential of using physics-guided machine learning to improve the accuracy of forecasting the intensity and location of extreme *** physics-guided ways of embedding physical features,fusing physical model forecasts and revised loss function are used,i.e.,(1)analyzing the anomalous circulation and thermodynamical factors,(2.analyzing the multi-model forecast bias and the associated underlying reasons for it,and(3)using professional forecasting knowledge to design the loss function,and the corresponding results are used as input for machine learning to improve the forecasting *** results indicate that by learning the relationship between anomalous physical features and heavy precipitation,the forecasting of precipitation intensity is improved significantly,but the location is rarely adjusted and more false alarms *** reasons for this are as *** anomalous features used here mainly contain information about large-scale systems and factors which are consistent with the model precipitation deviation;moreover,the samples of extreme precipitation are sparse and so the algorithm used here is ***,by combining“good and different”multi models with machine learning,the advantages of each model are extracted and then the location of the precipitation center in the forecast is improved ***,by combining the appropriate anomalous features with multi-model fusion,an integrated improvement of the forecast of the rainfall intensity and location is ***,this study is a novel exploration to improve the refined forecasting of heavy precipitation with extreme intensity and high variability,

关键词： Extreme precipitation event Refined assessment Anomalous physical features Multi-model fusion Machine learning

Community-Level Practice Checklists for Health Protection During Cold Spells in china

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china CDC weekly 2024年第5期6卷 83-87页

作者： jing Shang Mengzhen Zhao Zhao Liu Xiya Zhang Shiguang Miao Ishaq D.Sulaymon Wenjia Cai institute of Urban meteorology CMABeijingChina School of Management and Economics Beijing Institute of TechnologyBeijingChina School of Airport Economics and Management Beijing Institute of Economics and ManagementBeijingChina department of Earth System science Tsinghua UniversityBeijingChina Sand and Dust Storm Warning Regional Center National Center for MeteorologyJeddahSaudi Arabia Jiangsu Key Laboratory of atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing CityJiangsu ProvinceChina

Communities play a crucial role in protecting the health of vulnerable populations such as the elderly,low-income groups,and high-risk individuals during cold ***,current strategies for responding to cold spells primarily consist of programmatic policies that lack practicality,specificity,and detailed implementation guidelines for community ***,this study aims to identify and analyze the challenges faced by communities in responding to cold spells,review international experiences,and develop a set of practical checklists for community-level health *** checklists will assist community workers and volunteers in effectively preparing for,responding to,and recovering from cold spells.

关键词： preparing income primarily

虚拟现实技术在实验教学中的应用研究——以大气科学类实验教学为例

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江苏经贸职业技术学院学报 2018年第3期 90-92页

作者：王静项磊南京信息工程大学大气科学与环境气象国家级实验教学示范中心江苏南京210044

在大气科学类实验教学中引入虚拟现实技术,通过构建大气物理化学变化等虚拟实验环境,可以使学生更加直观、深入地理解抽象的理论教学内容。进行虚拟现实课程研发和教材建设,既能减少实验耗材支出,节省实验费用,同时也能给学生提供一个... 详细信息

在大气科学类实验教学中引入虚拟现实技术,通过构建大气物理化学变化等虚拟实验环境,可以使学生更加直观、深入地理解抽象的理论教学内容。进行虚拟现实课程研发和教材建设,既能减少实验耗材支出,节省实验费用,同时也能给学生提供一个集学习指南、示例视频与交互式练习为一体的学习模式,更好地调动学生的积极性、主动性和创造性。在实验教学中采用虚拟现实技术,对培养学生创造性的思维能力、创新性的科学态度和独立动手的实践能力也起到十分重要的作用。

关键词：虚拟现实实验教学大气科学

Assessing the Applicability of Multi-Source Precipitation Products over the Chinese Mainland and Its Seven Regions

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Journal of Tropical meteorology 2024年第3期30卷 275-288页

作者： TIAN Wei WU Yun-long LIN Chen ZHANG jing-guo LIM KAM SIAN Kenny Thiam Choy School of Computer and Software Nanjing University of Information Science&TechnologyNanjing 210044 China School of atmospheric science and Remote Sensing Wuxi UniversityWuxiJiangsu 214105 China

Satellite-based and reanalysis precipitation products provide valuable information for various ***,their performance varies widely across regions due to different data sources and production *** paper evaluated the daily performance of four precipitation products(MSWEP,ERA5,PERSIANN,and TRMM)for seven regions of the Chinese mainland,using observations from 2.62.ground stations across the country as a *** used four statistical and four classification indicators to describe their spatial and temporal accuracy,and capability to detect precipitation events while analyzing their *** results show that according to the precipitation char-acteristics and accuracy of different types of precipitation products over the Chinese mainland,MSWEP was the most suitable product over the Chinese mainland,having the lowest root mean square error and mean absolute error,along with the highest coefficient of *** was followed by TRMM and ERA5,whereas PERSIANN lagged behind in terms of *** terms of different regions,MSWEP still performed well,especially in North china and East *** accuracy of the four precipitation products was relatively low in the summer months,and they all overestimated in the northwest *** other months,MSWEP and TRMM were better than PERSIANN and *** four precipitation products had good detection performance over the Chinese mainland,with probability of detection above ***,with the increase of precipitation threshold,the detection capability of the four products decreased,and MSWEP and ERA5 had good detection capability for moderate ***’s detection capability for heavy rain and rainstorms was better than that of the other three products,and PERSIANN’s detection capability for moderate rain,heavy rain and rainstorms was relatively poor,with a large deviation.

关键词： precipitation product MSWEP TRMM ERA5 PERSIANN