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Circulation Background and Genesis Mechanism of a Cold Vortex over the Tibetan Plateau during Late April 2.18

Advances in atmospheric sciences 2024年第6期41卷 1201-1216页

作者： Duming GAO jiangyu mao {2. wu Yimin LIU state key Laboratory of Numerical {2. for atmospheric sciences and geophysical fluid dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of chinese academy of sciences Beijing 100049China Heavy Rain and Drought-Flood Disasters in Plateau and Basin key Laboratory of Sichuan Province Institute of Plateau MeteorologyChina Meteorological AdministrationChengdu 610072China chinese academy of sciences Center for Excellence in Tibetan Plateau Earth sciences Beijing 100101China

A cold vortex occurred over the northeastern Tibetan Plateau(TP)on 2. April 2.18 and subsequently brought excessive rainfall to the spring farming area in southern china.when moving *** study investigates the genesis mechanism of the cold TP vortex(TPV)by diagnosing reanalysis data and conducting numerical *** demonstrate that the cold TPV was generated in a highly baroclinic environment with significant contributions of positive potential vorticity(PV)forcing from the tropopause and diurnal thermodynamic impact from the *** a positive PV anomaly in the lower stratosphere moved towards the TP,the PV forcing at the tropopause pushed the tropospheric isentropic surfaces upward,forming isentropic-isplacement ascent and reducing static stability over the *** descent of the tropopause over the TP also produced a tropopause folding over the northeastern TP associated with a narrow high-PV column intruding downwards over the TPV genesis site,resulting in ascending air in the free ***,in conjunction with the descending air in the valley area during the night,produced air stretching just at the TPV genesis *** the surface cooling at night increased the surface static stability,the aforementioned vertical air-stretching thus converted the produced static stability to vertical ***,the cold TPV was generated over the valley at night.

关键词： tropopause PV forcing air column stretching static stability vertical vorticity

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The Tibetan Plateau bridge:Influence of remote teleconnections from extratropical and tropical forcings on climate anomalies

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atmospheric and Oceanic Science Letters 2024年第1期17卷 28-33页

作者： Yimin Liu Wei Yu Jilan Jiang Tingting Ma jiangyu mao {2. wu state key Laboratory of Numerical {2. for atmospheric sciences and geophysical fluid dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of chinese academy of sciences BeijingChina School of atmospheric sciences Sun Yat-sen UniversitySouthern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiChina Guangdong Province key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen UniversityZhuhaiChina

本文回顾了青藏高原桥梁作用方面的最新研究进展,涉及北大西洋气候异常对春,夏亚洲季风和厄尔尼诺-南方涛动(ENSO)事件的遥相关影响,热带海洋异常和中国东部极端气候异常之间的联系以及华南春雨的季节内变化等.介绍了年际时间尺度上,冬... 详细信息

本文回顾了青藏高原桥梁作用方面的最新研究进展,涉及北大西洋气候异常对春,夏亚洲季风和厄尔尼诺-南方涛动(ENSO)事件的遥相关影响,热带海洋异常和中国东部极端气候异常之间的联系以及华南春雨的季节内变化等.介绍了年际时间尺度上,冬-春季北大西洋海表温度强迫如何影响南亚季风的季节性转变以及随后ENSO事件的触发.5月份青藏高原上空显著的负感热斜压结构,为北大西洋影响亚洲季风和ENSO提供了桥梁效应,夏季北大西洋涛动与华东夏季降水变化显著相关,高原潜热在这一关系中起着桥梁作用.另一方面,这种高原桥梁效应也存在于从热带海洋异常到东亚夏季极端降水事件的连接中,以及从中纬度波列到华南春雨准双周振荡的联系中.

关键词：青藏高原桥梁作用遥相关北大西洋厄尔尼诺-南方涛动热带对流气候异常和极端事件

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Change in the tilting of the ridgeline surface of the subtropical anticyclone and the predictability of the onset of the Asian summer monsoon

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chinese Science Bulletin 2003年第S2期48卷 18-23页

作者： mao jiangyu, DUAN Anmin, LIU Yimin {2. guoxiong state key Laboratory of Numerical modeling for Almospheric sciences and geophysical fluid dynamics (LASG), institute of {12. Physics, {12., beijing 10002., china chinese Acad Sci Inst Atmospher Phys Lab Numer Modeling Atmospher Sci & Geophys Fluid LASGState Key Lab Numer Modeling Atmospher Sci & Beijing 100029 Peoples R China

The NCEP/NCAR reanalysis data are used tostudy the relationships among the change in the tilting of theridgeline surface of the subtropical anticyclone, the estab-lishment of the so-called "seasonal transition axis (STA)" andthe onset of the Asian summer monsoon. It is shown that themonsoon onset is characterized by the overturning of themeridional temperature gradient (MTG) in the vicinity of theridgeline surface. A MTG index is then constructed to inves-tigate the predictability of the Asian summer monsoon onsetconceptually. Data diagnoses show that if the initial MTG isknown and the meridional gradient across the ridgeline sur-face of the local temperature tendency can be estimated, alate or early onset of the summer monsoon can be qualita-tively predicted in advance.

关键词： ridgeline surface meridional temperature gradient summer monsoon onset predictability.

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Vortex genesis over the Bay of Bengal in spring and its role in the onset of the Asian Summer Monsoon

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Science china.Earth sciences 2011年第1期54卷 1-9页

作者： wu guoxiong1, GUAN Yue1,2, WANG TongMei3, LIU YiMin1, YAN JingHui4 & mao jiangyu1 1 state key Laboratory of Numerical modeling for atmospheric sciences and geophysical fluid dynamics (LASG), institute of atmospheric Physics, chinese academy of sciences, beijing 100029, china.2Graduate University of chinese academy of sciences, beijing 100049, china.3Department of atmospheric Science, Sun Yat-Sen University, Guangzhou 510275, china.4National Climate Center, china.Meteorological Administration, beijing 100080, china state key Laboratory of Numerical {2. for atmospheric sciences and geophysical fluid dynamics (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Graduate University of chinese academy of sciences Beijing China Department of atmospheric Science Sun Yat-Sen University Guangzhou China National Climate Center China Meteorological Administration Beijing China

Physical processes associated with onset of the 1998 Asian summer monsoon were examined in detail using multi-source datasets. We demonstrated that strong ocean-atmosphere-land interaction in the northern Indian Ocean and tropical Asian area during spring is a fundamental factor that induces the genesis and development of a monsoon onset vortex over the Bay of Bengal (BOB), with the vortex in turn triggering onset of the Asian summer monsoon. In spring, strong surface sensible heating over India and the Indochina.Peninsula is transferred to the atmosphere, forming prominent in situ cyclonic circulation, with anticyclonic circulations over the Arabian Sea and northern BOB where the ocean receives abundant solar radiation. The corresponding surface winds along the North Indian Ocean coastal areas cause the ocean to produce the in situ offshore currents and upwelling, resulting in sea surface temperature (SST) cooling. With precipitation on the Indochina.Peninsula increasing from late April to early May, the offshore current disappears in the eastern BOB or develops into an onshore current, leading to SST increasing. A southwest-northeast oriented spring BOB warm pool with SST >31°C forms in a band from the southeastern Arabian Sea to the eastern BOB. In early May, the Somali cross-equatorial flow forms due to the meridional SST gradient between the two hemispheres, and surface sensible heat over the African land surface. The Somali flow overlaps in phase with the anticyclone over the northern Arabian Sea in the course of its inertial fluctuation along the equator. The convergent cold northerlies on the eastern side of the anticyclone cause the westerly in the inertial trough to increase rapidly, so that enhanced sensible heat is released from the sea surface into the atmosphere. The cyclonic vorticity forced by such sensible heating is superimposed on the inertial trough, leading to its further increase in vorticity strength. Since {2. inertial motion is destr

关键词： air-sea interaction spring BOB warm pool monsoon onset vortex inertial oscillation Asian summer monsoon onset

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Influences of Typhoon Chanchu on the 2.06 South china.Sea summer monsoon onset

Influences of Typhoon Chanchu on the 2006 South China Sea su...

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“2.10年北京气象学会中青年优秀论文评选”学术研讨会

作者： jiangyu mao and {2. wu 1 state key Laboratory of Numerical modeling for atmospheric sciences and geophysical fluid dynamics(LASG),{12. of atmospheric Physics,chinese academy of sciences,beijing,china.

This study reveals some unique features associated with the impact of Typhoon Chanchu on the South china.Sea(SCS) summer monsoon(SCSSM) onset in *** Typhoon Chanchu entering the SCS in mid-May, southwesterlies were induced over the SCS and its upstream region due to a thermally forced Rossby wave response,leading to a reversal of low-level winds and a positive meridional temperature gradient(MTG) in the upper troposphere over the *** Chanchu thus acted as an immediate trigger for the SCSSM onset,and the onset date was suggested to occur in the third pentad of *** the typhoon landed in the coast of southern china.it still contributed to the establishment of the SCSSM due to warming the air column over the northern SCS,resulting in a persistent positive MTG with the ridge surface tilting northward.

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PV Perspective of Impacts on Downstream Extreme Rainfall Event of a Tibetan Plateau Vortex Collaborating with a Southwest china.Vortex

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Advances in atmospheric sciences 2021年第11期38卷 1835-1851页

作者： Guanshun ZHANG jiangyu mao Yimin LIU {2. wu state key Laboratory of Numerical {2. for atmospheric sciences and geophysical fluid dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of chinese academy of sciences Beijing 100049China

An extreme rainfall event occurred over the middle and lower reaches of the Yangtze Basin(MLY)during the end of June 2.16,which was attributable to a Tibetan Plateau(TP)Vortex(TPV)in conjunction with a Southwest china.Vortex(SWCV).The physical mechanism for this event was investigated from Potential Vorticity(PV)and omega perspectives based on MERRA-2.reanalysis *** cyclogenesis of the TPV over the northwestern TP along with the lower-tropospheric SWCV was found to involve a midtropospheric large-scale flow reconfiguration across western and eastern china.with the formation of a high-amplitude Rossby ***,the eastward-moving TPV coalesced vertically with the SWCV over the eastern Sichuan Basin due to the positive vertical gradient of the TPV-related PV advection,leading the lower-tropospheric jet associated with moisture transport to intensify greatly and converge over the downstream *** merged TPV−SWCV specially facilitated the upper-tropospheric isentropic-gliding ascending motion over the *** the TPV-embedded mid-tropospheric trough migrating continuously eastward,the almost stagnant SWCV was re-separated from the overlying TPV,forming a more eastward-tilted high-PV configuration to trigger stronger ascending motion including isentropic-gliding,isentropic-displacement,and diabatic heating-related ascending components over the *** led to more intense *** PV diagnoses demonstrate that both the coalescence and subsequent re-separation processes of the TPV with the SWCV were largely dominated by horizontal PV advection and PV generation due to vertically nonuniform diabatic heating,as well as the feedback of condensation latent heating on the isentropic-displacement vertical velocity.

关键词： extreme rainfall Tibetan Plateau vortex Southwest china.vortex PV vertical velocity

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位涡源汇和位涡环流及其天气气候意义

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大气科学 2024年第1期48卷 8-25页

作者：吴国雄刘屹岷毛江玉何编包庆谢永坤生宸马婷婷李言蹊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 中国科学院大学北京100049 兰州大学西部生态安全协同创新中心兰州730000

在扼要回顾地表位涡研究进展的基础上,本文介绍了复杂地形下的位涡及位涡制造的计算及近年来关于位涡源汇和位涡环流(PVC)的研究进展,侧重介绍青藏高原表层位涡的特殊性及其对天气气候的重要影响。阐明对于绝热和无摩擦大气运动,由于位... 详细信息

在扼要回顾地表位涡研究进展的基础上,本文介绍了复杂地形下的位涡及位涡制造的计算及近年来关于位涡源汇和位涡环流(PVC)的研究进展,侧重介绍青藏高原表层位涡的特殊性及其对天气气候的重要影响。阐明对于绝热和无摩擦大气运动,由于位涡本身的结构重组(位涡重构)可以引起垂直涡度的发展,在夏季可以激发高原涡形成,冬季使青藏高原东部成为重要的表面涡源。基于导得的包括非绝热加热作用的、与等熵面的位移相联系的垂直运动(ωID)方程,进一步阐明青藏高原制造的正位涡沿西风气流东传会引起下游地区低空气旋性涡度、偏南风、和上升运动发展,导致位涡平流随高度增加,激发极端天气气候事件发生发展。指出青藏高原地表加热和云底的潜热释放的日变化显著地影响着地表层位涡的日变化,导致青藏高原的低涡降水系统多在午后至夜间发生发展。证明与传统的青藏高原感热加热指数相比,青藏高原地表层位涡指数能够更好地刻画关于降水的季节变化,与亚洲夏季风降水相关更密切。本文还简单介绍了PVC的概念。指出由于区域边界面的PVC的辐散辐合的变化直接与区域位涡的变化相关联,为保持北半球位涡总量的相对稳定,跨赤道面上的PVC变化与地表PVC的变化必须相互补充,因此跨赤道面上的位涡环流的变化可以成为监测近地表气候变化的窗口。近赤道的海气相互作用能够直接造成沿赤道垂直面上的纬向风垂直切变的变化,激发跨赤道位涡环流异常,从而通过大气内部PVC的变化和青藏高原的调控影响北半球近地表的气候变化。结果表明位涡环流分析为建立热带和热带外大气环流变化的联系开辟了新的蹊径,有着广阔的应用前景。

关键词：位涡源汇位涡环流青藏高原极端天气事件

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Synergistic Effect of the Planetary-scale Disturbance, Typhoon and Meso-β-scale Convective Vortex on the Extremely Intense Rainstorm on 2. July 2.2. in Zhengzhou

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Advances in atmospheric sciences 2023年第3期40卷 428-446页

作者： Guanshun ZHANG jiangyu mao Wei HUA Xiaofei {2. Ruizao SUN Ziyu YAN Yimin LIU guoxiong {2. Guangzhou institute of Tropical and Marine Meteorology/Guangdong Provincial key Laboratory of Regional Numerical Weather Prediction China Meteorological AdministrationGuangzhou 510640China state key Laboratory of Numerical {2. for atmospheric sciences and geophysical fluid dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Plateau Atmosphere and Environment key Laboratory of Sichuan Province Chengdu University of Information TechnologyChengdu 610225China Henan key Laboratory of Agrometeorological Support and Applied Technique CMAZhengzhou 450003China Henan Meteorological Service Center Zhengzhou 450003China School of Geo-Science and Technology Zhengzhou UniversityZhengzhou 450001China

On 2. July 2.2.,northern Henan Province in china.experienced catastrophic flooding as a result of an extremely intense rainstorm,with a record-breaking hourly rainfall of 2.1.9 mm during 0800–0900 UTC and daily accumulated rainfall in Zhengzhou City exceeding 600 mm(“Zhengzhou 7.2. rainstorm”for short).The multi-scale dynamical and thermodynamical mechanisms for this rainstorm are investigated based on station-observed and ERA-5 reanalysis *** backward trajectory tracking shows that the warm,moist air from the northwestern Pacific was mainly transported toward Henan Province by confluent southeasterlies on the northern side of a strong typhoon In-Fa(2.2.),with the convergent southerlies associated with a weaker typhoon Cempaka(2.2.)concurrently transporting moisture northward from South china.Sea,supporting the *** the upper troposphere,two equatorward-intruding potential vorticity(PV)streamers within the planetary-scale wave train were located over northern Henan Province,forming significant divergent flow aloft to induce stronger ascending motion ***,the converged moist air was also blocked by the mountains in western Henan Province and forced to rise so that a deep meso-β-scale convective vortex(MβCV)was induced over the west of Zhengzhou *** PV budget analyses demonstrate that the MβCV development was attributed to the positive feedback between the rainfall-related diabatic heating and high-PV under the strong upward PV advection during the Zhengzhou 7.2. ***,the MβCV was forced by upper-level larger-scale westerlies becoming eastward-sloping,which allowed the mixtures of abundant raindrops and hydrometeors to ascend slantwise and accumulate just over Zhengzhou City,resulting in the record-breaking hourly rainfall locally.

关键词： extreme rainstorm potential vorticity trajectory tracking planetary-scale disturbance meso-β-scale convective system

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Decadal Changes in Interannual Dependence of the Bay of Bengal Summer Monsoon Onset on ENSO Modulated by the Pacific Decadal Oscillation

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Advances in atmospheric sciences 2019年第12期36卷 1404-1416页

作者： Xiaofei wu jiangyu {2. School of atmospheric sciences/Plateau Atmosphere and Environment {2. Laboratory of Sichuan Province/Joint Laboratory of Climate and Environment Change Chengdu University of Information TechnologyChengdu 610225China state key Laboratory of Numerical {2. for atmospheric sciences and geophysical fluid dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Interannual variations of the Bay of Bengal summer monsoon (BOBSM) onset in association with El Ni-o-Southern Oscillation (ENSO) are reexamined using NCEP1, JRA-55 and ERA2.C atmospheric and Hadley sea surface temperature (SST) reanalysis datasets over the period 1900-2.17. Decadal changes exist in the dependence of the BOBSM onset on ENSO, varying with the Pacific Decadal Oscillation (PDO). A higher correlation between the BOBSM onset and ENSO arises during the warm PDO epochs, with distinct late (early) onsets following El Ni-o (La Ni-a) events. In contrast, less significant correlations occur during the cold PDO epochs. The mechanism for the PDO modulating the ENSO-BOBSM onset relationship is through the variations in SST anomaly (SSTA) patterns. During the warm PDO epochs, the superimpositions of the PDO-related and ENSO-related SSTAs lead to the SSTA distribution of an El Ni-o (La Ni-a) event exhibiting significant positive (negative) SSTAs over the tropical central-eastern Pacific and Indian Ocean along with negative (positive) SSTAs, especially over the tropical western Pacific (TWP), forming a strong zonal interoceanic SSTA gradient between the TWP and tropical Indian Ocean. Significant anomalous lower tropospheric easterlies (westerlies) together with upper-tropospheric westerlies (easterlies) are thus induced over the BOB, favoring an abnormally late (early) BOBSM onset. During the cold PDO epochs, however, the superimpositions of PDO-related SSTAs with El Ni-o-related (La Ni-a-related) SSTAs lead to insignificant SSTAs over the TWP and a weak zonal SSTA gradient, without distinct circulation anomalies over the BOB favoring early or late BOBSM onsets.

关键词： decadal change Bay of Bengal summer monsoon onset ENSO Pacific Decadal Oscillation

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Tibetan Plateau climate dynamics: recent research progress and outlook

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National Science Review 2015年第1期2卷 100-116页

作者： guoxiong wu Anmin Duan Yimin Liu {2. mao Rongcai Ren Qing Bao Bian He Boqi Liu Wenting Hu The state key Laboratory of Numerical Modelling for {2. sciences and geophysical fluid dynamics Institute of Atmospheric PhysicsChinese Academy of Sciences

This paper reviews progress in the study of Tibetan Plateau(TP) climate dynamics over the past *** theoretical frameworks, including thermal adaptation and the TP sensible heat(SH) driving air-pump, have been developed to identify the mechanisms responsible for the circulation anomaly produced by thermal forcing of the TP. Numerical simulations demonstrate that the thermal efects of large-scale orography, including the Tibetan and Iranian Plateaus(TIP), are crucial for the formation of the East Asian and South Asian summer monsoons(SASM) because the surface SH of the TIP is the major driver of the water vapor transport required for the genesis of the north branch of the SASM. he large-scale orography of the TP afects the Asian climate through thermal forcing in spring and summer, and mechanical forcing in winter. he TP forcing can also inluence the Asian summer monsoon(ASM) onset over the Bay of Bengal(BOB) by enhancing the BOB warm pool at the surface and by modulating the South Asian High(SAH) in the upper troposphere. On intra-seasonal timescales, the TP thermal forcing signiicantly modulates spring rainfall in southern china.and generates the biweekly oscillation of the SAH in summer. Despite climate warming, the {2. heat source over the TP, particularly the spring SH,exhibits a clear weakening trend from the 1980 s to 2.00 s. his weakening of the spring SH contributed to the anomalous ‘dry in the north' and ‘wet in the south' rainfall patern observed over East china. Also discussed are challenges to further understanding the mechanism of TP forcing on the multi-scale variability of the ASM.

关键词： Tibetan Plateau climate dynamics Asian monsoon land–air–sea interaction numerical simulation

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