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Teleconnection between the Indian summer monsoon onset and the Meiyu over the Yangtze River Valley

Science China Earth Sciences 2008年第7期51卷 1021-1035页

作者： liu yunyun1,2.3.& {2. {3. chinese academy of meteorological Sciences, beijing 100081, China 2.National Climate Center, beijing 100081, China 3.Graduate University of chinese academy of Sciences, {12. 100049, China chinese academy of {2. Sciences Beijing China National Climate Center Beijing China Graduate University of chinese academy of Sciences Beijing China

Based on the Indian and chinese precipitation data and the NCEP-NCAR reanalysis circulation data, the relationship between the Indian summer monsoon (ISM) onset and the Meiyu over the Yangtze River Valley has been discussed by the methods of correlation analysis and composite analysis. The results show that the date of ISM onset over Kerala in the southwestern coast of the Indian Peninsula is about two weeks earlier than the beginning of the Meiyu over the Yangtze River Valley. After the outbreak of ISM, the teleconnection mode sets up from the western coast of India via the Bay of Bengal (BOB) to the Yangtze River Valley and southern Japan. It is different both in time and space from the telecon- nection mode which is from the northwest of India via the Tibetan Plateau to northern China. The for- mer mode is defined as the "south" teleconnection of the Asian summer monsoon, forming in the pe- riod of ISM onset; while the latter mode is called the "north" teleconnection, mainly occurring in the Asian monsoon culminant period. During the process of the "south" teleconnection’s formation, the Asian monsoon circulation has experienced a series of important changes: ISM onset, the northward movement of the south Asia high (SAH), the onset vortex occurrence, the eastward extension of the stronger tropical westerly belt, and the northeastward jump of the western Pacific subtropical high (WPSH), etc. Consequently, since ISM sets up over Kerala, the whole Asian continent is covered by the upper SAH after about two weeks, while in the mid- and lower troposphere, a strong wind belt forms from the Arabian Sea via the southern India, BOB and the South China Sea (SCS), then along the western flank of WPSH, to the Yangtze River Valley and southern Japan. With the northward moving of the subtropical jet streams, the upper westerly jet stream and the low level jet have been coupled ver- tically over east Asia, while the Yangtze River Valley happens to locate in the ascending motion

关键词： Indian summer monsoon (ISM) the Meiyu over the Yangtze River Valley teleconnection mode

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Atmospheric Circulation and Dynamic Mechanism for Persistent Haze Events in the beijing–Tianjin–Hebei Region

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Advances in Atmospheric Sciences 2017年第4期34卷 429-440页

作者： Ping WU yihui ding Yanju {2. College of Atmospheric Science Nanjing University of Information Science and TechnologyNanjing 210044China chinese academy of {2. Sciences Beijing 100081China National Climate Center Beijing 100081China

In this study, regional persistent haze events（RPHEs） in the beijing–Tianjin–Hebei（BTH） region were identified based on the Objective Identification Technique for Regional Extreme Events for the period 1980–2.1{2. The formation mechanisms of the severe RPHEs were investigated with focus on the atmospheric circulation and dynamic mechanisms. Results indicated that：（1） 49 RPHEs occurred during the past {2. years.（2. The severe RPHEs could be categorized into two types according to the large-scale circulation, i.e. the zonal westerly airflow（ZWA） type and the high-pressure ridge（HPR） type. When the ZWA-type RPHEs occurred, the BTH region was controlled by near zonal westerly airflow in the mid–upper *** winds prevailed in the lower troposphere, and near-surface wind speeds were only 1–2.ms^-1. Warm and humid air originating from the northwestern Pacific was transported into the region, where the relative humidity was 70% to 80%, creating favorable moisture conditions. When the HPR-type RPHEs appeared, northwesterly airflow in the mid–upper troposphere controlled the region. Westerly winds prevailed in the lower troposphere and the moisture conditions were relatively weak.（{2. Descending motion in the mid-lower troposphere caused by the above two circulation types provided a crucial dynamic mechanism for the formation of the two types of RPHEs. The descending motion contributed to a reduction in the height of the planetary boundary layer（PBL）, which generated an inversion in the lower troposphere. This inversion trapped the abundant pollution and moisture in the lower PBL, leading to high concentrations of pollutants.

关键词： beijing–Tianjin–Hebei region regional persistent haze events atmospheric circulation dynamic mechanism

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Environmental and Dynamic Conditions for the Occurrence ofPersistent Haze Events in North China

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Engineering 2017年第2期3卷 266-271页

作者： yihui ding Ping Wu Yanju {2. Yafang Song National Climate Center Beijing 100081 China chinese academy of {2. Sdences Beijing 100081 China College of Atmospheric Science Nanjing University o.f lnforrnation Sdence and Technology Nanjing 210044 China

This paper presents a concise summary of recent studies on the long-term variations of haze in NorthChina and on the environmental and dynamic conditions for severe persistent haze events. Resultsindicate that haze days have an obviously rising trend over the past 50 years in North China. Theoccurrence frequency of persistent haze events has a similar rising trend due to the continuous riseof winter temperatures, decrease of surface wind speeds, and aggravation of atmospheric stability. InNorth China, when severe persistent haze events occur, anomalous southwesterly winds prevail in thelower troposphere, providing sufficient moisture for the formation of haze. Moreover, North China ismainly controlled by a deep downdraft in the mid-lower troposphere, which contributes to reducing thethickness of the planetary boundary layer, obviously reducing the atmospheric capacity for *** atmospheric circulation and sinking motion provide favorable conditions for the formation andmaintenance of haze in North China.

关键词： North China Persistent haze events Environmental conditions Dynamic conditions

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The impact of meteorological changes from 2.1{2.to 2.17 on PM2.5 mass reduction in key regions in China

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Science China Earth Sciences 2019年第12期62卷 1885-1902页

作者： Xiaoye ZHANG Xiangde XU yihui ding Yanju {2. Hengde ZHANG Yaqiang WANG Junting ZHONG chinese academy of {2. Sciences China Meteorological AdministrationBeijing 100081China National Climate Centre China Meteorological AdministrationBeijing 100081China National meteorological Center China Meteorological AdministrationBeijing 100081China

In 2.13.China issued the"Action Plan for the Prevention and Control of Air Pollution"("Ten Statements of Atmosphere")and implemented a series of pollution reduction measures from 2.13.to *** key regions of China,the mass concentrations of particulate matter with aerodynamic equivalent diameters less than 2.5μm(PM2.5)have dropped ***,the contributions of meteorological changes to PM2.5 reduction are largely uncertain,which has attracted particular concern from the government and the ***,we investigated the impact of large-scale and boundary layer(BL)meteorological conditions on aerosol pollution and estimated the contributions of meteorological changes to PM2.5 reduction based on in-depth analysis and diagnosis of various observed meteorological elements and an integrated pollution-linked meteorological index(PLAM,which is approximately and linearly related to PM mass concentration).In this study,we found that the meteorological conditions worsened in 2.14 and 2.15 and improved in 2.16 and 2.17 relative to those in 2.13.in key regions in *** 2.17 relative to 2.13.only^5%(approximately 13.of the total PM2.5 decline)of the 3..6%reduction in PM2.5 mass concentrations can be attributed to meteorological changes in the beijing-Tianjin-Hebei(BTH)region,and only^7%(approximately 20%of the total PM2.5 decline)of the 3..3.reduction can be attributable to meteorological changes in the Yangtze River Delta(YRD)***,the PM2.5 reduction due to meteorological improvement is much lower than the observed PM2.5 reduction in these areas,which indicates that emission reduction during the five-year implementation of the"Ten Statements of Atmosphere"is the dominant factor in the improvement in air *** changes in meteorology and climate are conducive to PM2.5 reduction but do not dominate the substantial improvement in air *** to the above regions,in the Pearl River Delta(PRD)region,the impact of meteorological changes on the

关键词： Quantifying unfavorable meteorological conditions Contribution of meteorological Conditions to PM2.5 Change Ten Statements of Atmosphere

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Influence of Human Activities on Wintertime Haze-Related meteorological Conditions over the Jing–Jin–Ji Region

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Engineering 2021年第8期7卷 1185-1192页

作者： Ying Xu Yanju liu Zhenyu Han Botao Zhou yihui {2. Jie Wuc Tongfei Tian Rouke Li Jing Wang National Climate Center China Meteorological AdministrationBeijing 100081China Collaborative Innovation Center on Forecast and Evaluation of meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China School of Geography and Environmental Engineering Gannan Normal UniversityGanzhou 341000China Camford Royal School Beijing 100093China Climate and Environment Modeling Lab Institute of Earth EnvironmentChinese Academy of SciencesXi’an 710061China

This work analyzes and discusses the influence of human activities on the meteorological conditions related to winter haze events in beijing,Tianjin,and Hebei(i.e.,the Jing-Jin-Ji region)during 1961-{2.6,using the results of two numerical simulation experiments based on the Community Atmosphere Model version 5.1.1(http://***/models/cesm1.0/cam/docs/ug5_1_1/***)used in the international Climate Variability and Predictability Programme(CLIVAR)Climate of the 2.th Century Detection and Attribution Project(C2.C+D&A).The results show that,under the influence of human activities,the changes in dynamical and thermal meteorological conditions related to winter haze events in the Jing–Jin–Ji region are conducive to the formation and accumulation of haze,and prevent the diffusion of *** dynamical conditions mainly include the obvious weakening of the East Asian winter monsoon(EAWM)and the enhancement of the near-surface anomalous southerly *** thermal conditions include the obvious increase in surface temperature,and the enhancement of water vapor transport and near-surface *** relative contribution of dynamical and thermal conditions to the variation of haze days in the Jing-Jin-Ji region is analyzed using statistical *** results show that the contribution of human activities to the increase of haze days in the Jing-Jin-Ji region is greater than that of natural forcing for the study *** be specific,the dynamical meteorological factors contribute more to the haze days than the thermal meteorological *** contribution of thermal meteorological factors is basically the same in both scenarios.

关键词： meteorological conditions Human activities Haze Jing-Jin-Ji region

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The Warm Arctic-Cold Eurasia Pattern and Its Key Region in Winter in CMIP6 Model Simulations

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Advances in Atmospheric Sciences 2023年第12期40卷 2138-2153,I0002-I0006页

作者： Liang ZHAO Yunwen liu yihui {2. Qingquan LI Wei DONG Xinyong SHEN Wei CHENG Haoxin YAO Ziniu XIAO State Key Laboratory of Numerical Modeling for Atmosphere Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjing 210044China Neijiang meteorological Bureau Neijiang 641000China China meteorological Administration National Climate CenterBeijing 100081China Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhou 310058China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China beijing Institute of the Applied Meteorology Beijing 100029China

An enhanced Warm Arctic-Cold Eurasia(WACE)pattern has been a notable feature in recent winters of the Northern ***,divergent results between model and observational studies of the WACE still *** study evaluates the performance of 3. climate models participating in the Coupled Model Intercomparison Project Phase 6(CMIP6)in simulating the WACE pattern in winter of 1980-2.14 and explores the key factors causing the differences in the simulation capability among the *** results show that the multimodel ensemble(MME)can better simulate the spatial distribution of the WACE pattern than most single *** that can/cannot simulate both the climatology and the standard deviation of the Eurasian winter surface air temperature well,especially the latter,usually can/cannot simulate the WACE pattern *** mainly results from the different abilities of the models to simulate the range and intensity of the warm anomaly in the Barents Sea-Kara seas(BKS)*** analysis shows that a good performance of the models in the BKS area is usually related to their ability to simulate location and persistence of Ural blocking(UB),which can transport heat to the BKS region,causing the warm Arctic,and strengthen the westerly trough downstream,cooling central ***,simulation of UB is key and significantly affects the model’s performance in simulating the WACE.

关键词： warm Arctic-cold Eurasia pattern Arctic amplification CMIP6 simulation evaluation extreme climate blocking highs

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亚非夏季风的年代际变化:大西洋多年代际振荡与太平洋年代际振荡的协同作用

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大气科学学报 2020年第1期43卷 20-32页

作者：丁一汇李怡王遵娅司东柳艳菊中国气象局国家气候中心北京100081 中国气象局公共气象服务中心北京100081 中国科学院大气物理所北京100029

亚非夏季风系统包括非洲夏季风、南亚夏季风和东亚夏季风。它是全球季风系统中具有高度整体一致性变化的系统,其主要原因是亚非夏季风系统具有相同的主要驱动力:AMO(Atlantic Multidecadal Oscillation,大西洋多年代际振荡)和PDO(Pacifi... 详细信息

亚非夏季风系统包括非洲夏季风、南亚夏季风和东亚夏季风。它是全球季风系统中具有高度整体一致性变化的系统,其主要原因是亚非夏季风系统具有相同的主要驱动力:AMO(Atlantic Multidecadal Oscillation,大西洋多年代际振荡)和PDO(Pacific Decadal Oscillation,太平洋年代际振荡)海洋年代际变化模态。在此前提下,本文首先阐述了AMO对亚非夏季风的强迫作用与遥相关作用,特别强调了它在亚非夏季风及其降水年代际转型中的作用;其次讨论了PDO与冬春积雪的年代际变化对东亚夏季风雨带的协同作用;最后综合分析了AMO、PDO与IOBM(Indian Ocean Basin Mode,印度洋海盆一致模态)的协同作用,指出印度洋海洋模态在年代尺度上独立于AMO与PDO的相关组合,主要起着加强东亚夏季风活动的作用。

关键词：大西洋多年代际振荡(AMO) 太平洋年代振荡(PDO) 全球季风系统亚非夏季风的协同作用

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论东亚夏季风的特征、驱动力与年代际变化

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大气科学 2018年第3期42卷 533-558页

作者：丁一汇司东柳艳菊王遵娅李怡赵亮宋亚芳中国气象局国家气候中心北京100081 中国气象局公共气象服务中心北京100081 中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG) 北京100029

本文是以新的资料和研究结果对东亚夏季风的基本特征、驱动力和年代际变化所作的重新分析与评估。内容包括四个部分:(1)东亚夏季风的基本特征;(2.东亚夏季风的驱动力;(3.东亚夏季风的年代际变率与原因;(4)东亚夏季风与全球季风的关系。... 详细信息

本文是以新的资料和研究结果对东亚夏季风的基本特征、驱动力和年代际变化所作的重新分析与评估。内容包括四个部分:(1)东亚夏季风的基本特征;(2.东亚夏季风的驱动力;(3.东亚夏季风的年代际变率与原因;(4)东亚夏季风与全球季风的关系。结果表明:东亚夏季风是亚洲夏季风的一个重要有机部分,主要由来源于热带的季风气流组成,并随季节由南向北呈阶段性推进,它是形成夏季东亚天气与气候的主要环流和降水系统。驱动夏季风的主要强迫有三部分:外部强迫、耦合强迫与内部变率,其中人类活动引起的外强迫(气候变暖、城市化、气溶胶增加等)是新出现的外强迫,它正不断改变着东亚夏季风的特征与演变趋势。海洋与陆面耦合强迫作为自然因子是引起东亚夏季风年际和年代际变化的主要原因,其中太平洋年代尺度振荡(PDO)与北大西洋多年代尺度振荡(AMO)的协同作用是造成东亚夏季风3.~40年周期振荡的主要原因。1960年代以后,东亚夏季风经历了强—弱—强的年代际变化,相应的中国东部夏季降水型出现了"北多南少"向"南涝北旱"以及"北方渐增"的转变。最近的研究表明,上述东亚夏季风年代际变化与整个亚非夏季风系统的变化趋势是一致的。在本世纪主要受气候变暖的影响,夏季风雨带将持续北移,中国北方和西部地区出现持续性多雨的格局。最后本文指出,亚非夏季风系统相比于其他区域季风系统更适合全球季风的概念。

关键词：东亚夏季风夏季风特征季风驱动力年代际变化全球季风

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