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The south china Quasi-Stationary Front During the Ice-Snow Disaster of January 2008

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Acta meteorologica Sinica 2010年第4期24卷 521-526页

作者：陶祖钰郑永光张小玲 Physics School of Peking University National key laboratory of severe weather Chinese Academy of Meteorological Sciences National Meteorological Center

south china suffered an extremely severe disaster caused by low-temperature and ice-snow during the last 20 days of January 2008. The freezing rain and snow are climatologically related to the south china quasistationary front （SCQSF） in mid winter. The three-dimensional structure of the SCQSF was examined based on the weather charts, the sounding profiles, and the vertical cross-sections using the method of classical synoptic analysis.

关键词： frontal structure ice-snow weather synoptic analysis

Tropospheric NO_2 vertical column densities retrieved from ground-based MAX-DOAS measurements at Shangdianzi regional atmospheric background station in china

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环境科学学报：英文版 2019年第6期31卷 186-196页

作者： Siyang Cheng Jianzhong Ma Weiping Cheng Peng Yan Huaigang Zhou Liyan Zhou Peng Yang State key laboratory of severe weather & CMA key laboratory of Atmospheric Chemistry Chinese Academy of Meteorological Sciences china Waterborne Transport Research Institute CMA Meteorological Observation Centre Shangdianzi Regional Air Background Station Beijing Meteorological Bureau Meteorological Bureau of Shijiazhuang

Ground-basedMulti-AXis Differential Optical Absorption Spectroscopy(MAX-DOAS)measurements were performed at Shangdianzi(SDZ)regional atmospheric background station in northern china from March 2009 to February *** tropospheric NO_2vertical column densities(VCDs)were retrieved to investigate the background condition of the Beijing–Tianjin–Hebei developed economic circle in *** seasonal variation of mean NO_2tropospheric VCDs(VCD_(Trop))at SDZ is apparent,with the maximum(1.3×10^(16)molec/cm^2)in February and the minimum(3.5×10^(15)molec/cm^2)in August,much lower than those observed at the Beijing city *** average daytime diurnal variations of NO_2VCD_(Trop )are rather consistent for all four seasons,presenting the minimum at noon and the higher values in the morning and *** largest and lowest amplitudes of NO_2VCD_(Trop)diurnal variation appear in winter and in summer,*** diurnal pattern at SDZ station is similar to those at other less polluted stations,but distinct from the ones at the urban or polluted *** NO_2VCDs at SDZ are strongly dependent on the wind,with the higher values being associated with the pollution plumes from Beijing *** NO_2VCDs derived from ground-based MAX-DOAS at SDZ show to be well correlated with corresponding OMI(Ozone Monitoring Instrument)satellite products with a correlation coefficient R=***,the OMI observations are on average higher than MAX-DOAS NO_2VCDs by a factor of 28%,probably due to the OMI grid cell partly covering the south of SDZ which is influenced more by the pollution plumes from the urban areas.

关键词： Ground-basedMAX-DOAS Tropospheric NO2 Satellite validation Pollution plume Regional atmospheric background station

Simulation of the Effects of the Preceding SST Anomalies over the Tropical Eastern Pacific on Precipitation to the south of the Yangtze River in June

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Acta meteorologica Sinica 2009年第6期23卷 691-700页

作者：李琰王亚非董敏 State key laboratory of severe weather Chinese Academy of Meteorological Sciences Nanjing University of Information Science&Technology laboratory for Climate Studies National Climate CenterChina Meteorological Administration

Numerical experiments are performed to simulate the response of the atmospheric circulation and pre-cipitation over East china in June to the sea surface temperature（SST）anomalies over the tropical eastern Pacific（TEP）from preceding September to June by using an atmospheric general circulation model （AGCM）.We constructed composite positive/negative SST anomalies（P-SSTAs/N-SSTAs）based on the observational SST anomalies over the TEP from September 1997 to June *** results show that：（1） the response of the precipitation in the Yangtze River basin and its southern area（YRBS）to El Nino with different durations varies with the maximum amplitude of the precipitation anomalies appearing when the imposed duration is from November to next June,and the minimum appearing when the SST anomalies is only imposed in *** anomalies of the precipitation are reduced when the duration of the forcing SST anomalies over the TEP is shortened and the positive SST anomalies in the preceding autumn tend to cause significantly more rainfall in the *** is in agreement with previous diagnostic analysis results.（2）The simulated precipitation anomalies over the YRBS are always obviously positive under strong or weak positive SST anomalies over the *** intensity of the precipitation anomalies increases with increasing intensity of the SST anomalies in the *** simulation results are consistent with the observations during the warm SST events,suggesting reasonable modeling results.（3）When negative SST anomalies in the TEP are put into the model,the results are different from those of the diagnostic analysis of La Nina *** precipitation anomalies in YRBS could be reproduced only when the negative SST anomalies are strong enough.

关键词： atmospheric general circulation model(AGCM) sea surface temperature(SST)anomalies numerical simulation

Possible mechanism of the effect of convection over Asian-Australian “land bridge” on the East Asian summer monsoon onset

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Science china Earth Sciences 2006年第11期49卷 1223-1232页

作者： HE Jinhai1, WEN Min2, DING Yihui3 & ZHANG Renhe2 1. Jiangsu key laboratory of Meteorological Disaster (KLME), Nanjing Institute of Meteorology, Nanjing University of Informa- tion Science and Technology, Nanjing 210044, china 2. State key laboratory of severe weather (LaSW), Chinese Academy of Meteorological Sciences, Beijing 100081, china 3. National Climate Center, Chinese Meteorological Administration, Beijing 100081, china Jiangsu key laboratory of Meteorological Disaster (KLME) Nanjing Institute of Meteorology Nanjing University of Information Science and Technology Nanjing China State key laboratory of severe weather (LaSW) Chinese Academy of Meteorological Sciences Beijing China National Climate Center Chinese Meteorological Administration Beijing China

The Asian-Australian “land bridge” is an area with the most vigorous convection in Asian monsoon region in boreal spring, where the onset and march of convection are well associated with the onset of East Asian summer monsoon. The convection occurs over Indo-china Peninsula as early as mid-April, which exerts critical impact on the evolution of monsoon circulation. Before mid-April there are primarily sensible heatings to the atmosphere over Indo-china Peninsula and Indian Peninsula, so the apparent heating ratios over them decrease with height. However, after mid-April it changes into latent heating over Indo-china Peninsula due to the onset of convection, and the apparent heating ratio increases with height in mid- and lower troposphere. The vertical distribution of heating ratio and its differences between Indo-china Peninsula and Indian Peninsula are the key factors leading to the splitting of boreal subtropical high belt over the Bay of Bengal. Such mechanism is strongly supported by the fact that the evolution of the vertical heating ratio gradient above Indo-china Peninsula leads that of 850 hPa vorticity over the Bay of Bengal. Convections over Indo-china Peninsula and its surrounding areas further increase after the splitting. Since then, there is a positive feedback lying among the convective heating, the eastward retreat of the subtropical high and the march of monsoon, which is a possible mechanism of the advance of summer monsoon and convection from Indo-china Peninsula to south china Sea.

关键词： Asian-Australian 'land bridge', tropical convection, Indo-china Peninsula, the splitting of boreal subtropical high belt, East Asian summer monsoon onset.

The Propagation of Wave Packets and Its Relationship with the Subtropical Jet over southern china in January 2008

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Advances in Atmospheric Sciences 2013年第1期30卷 67-76页

作者：左群杰高守亭吕达仁 laboratory of Cloud-Precipitation Physics and severe Storms Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences key laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of Sciences State key laboratory of severe weather Chinese Academy of Meteorological Sciences

The propagation of wave packets and its relationship with the subtropical jet was investigated for the period 26 29 January 2008 over southern china using ECMWF Interim re-analysis data. Wave packets propagated from the north to the south side of an upper front with eastward development along the upper front during this period. Due to the eastward development of propagation, the acceleration of geostrophic westerly winds shifted eastward along the front. There were two primary sources of the propagation of wave packets at around 30°N. The first was the temperature inversion layer below 500 hPa, and the second was baroclinic zones located along the polarward flank of the subtropical jet in the middle and upper troposphere. Most wave packets propagated horizontally from the baroclinic zones and then converged on the zero meridional gradients of zonal winds.

关键词： propagation of wave packets wave-mean flow interaction subtropical jet geopotential anomalies snowstorms

Potential Vorticity Diagnostic Analysis on the Impact of the Easterlies Vortex on the Short-term Movement of the Subtropical Anticyclone over the Western Pacific in the Mei-yu Period

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Advances in Atmospheric Sciences 2020年第9期37卷 1019-1031页

作者： Xiuping YAO Qin ZHANG Xiao ZHANG china Meteorological Administration Training Centre Beijing 100081China Zibo Meteorological Bureau of Shandong Province Zibo 255048China State key laboratory of severe weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081China

By employing NCEP−NCAR 1°×1°reanalysis datasets,the mechanism of the easterlies vortex(EV)affecting the short-term movement of the subtropical anticyclone over the western Pacific(WPSA)in the mei-yu period is examined using potential vorticity(PV)*** results show that when the EV and the westerlies vortex(WV)travel west/east to the same longitude of 120°E,the WPSA suddenly *** EV and WV manifest as the downward transport of PV in the upper troposphere,and the variation of the corresponding high-value regions of PV significantly reflects the intensity changes of the EV and *** meridional propagation of PV causes the intensity change of the *** vertical movement on both sides of the EV is related to the position of the EV relative to the WPSA and the south Asian high(SAH).When the high PV in the easterlies and westerlies arrive at the same longitude in the meridional direction,the special circulation pattern will lower the position of PV isolines at the ridge line of the ***,the cyclonic circulation at the lower level will be strengthened,causing the abnormally eastward retreat of the *** of the PV equation at the isentropic surface indicates that when the positive PV variation west of the EV intensifies,it connects with the positive PV variation east of the WV,forming a positive PV band and making the WPSA retreat *** horizontal advection of the PV has the greatest *** contribution of the vertical advection of PV and the vertical differential of heating is also positive,but the values are relatively *** contribution of the residual was negative and it becomes smaller before and after the WPSA retreats.

关键词： mei-yu period easterlies vortex western Pacific subtropical anticyclone potential vorticity diagnostic analysis

Analysis of an Ensemble of High-Resolution WRF Simulations for the Rapid Intensification of Super Typhoon Rammasun(2014)

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Advances in Atmospheric Sciences 2020年第2期37卷 187-210页

作者： Xun LI Noel EDAVIDSON Yihong DUAN Kevin JTORY Zhian SUN Qinbo CAI key laboratory of south china Sea Meteorological Disaster Prevention and Mitigation of Hainan Province China Meteorological AdministrationHaikouHainan 570203China Hainan Meteorological Services China Meteorological AdministrationHaikouHainan 570203China Research and Development Branch Bureau of MeteorologyMelbourne 3001Australia State key laboratory of severe weather Chinese Academy of Meteorological SciencesBeijing 100081China

Diagnostics are presented from an ensemble of high-resolution forecasts that differed markedly in their predictions of the rapid intensification(RI)of Typhoon *** show that the basic difference stems from subtle differences in initializations of(a)500-850-h Pa environmental winds,and(b)midlevel moisture and *** then describe how these differences impact on the evolving convective organization,storm structure,and the timing of *** expected,ascent,diabatic heating and the secondary circulation near the inner-core are much stronger in the member that best forecasts the *** evolution of vortex cloudiness from this member is similar to the actual imagery,with the development of an inner cloud band wrapping inwards to form the *** present evidence that this structure,and hence the enhanced diabatic heating,is related to the tilt and associated dynamics of the developing inner-core in *** the most accurate ensemble member:(a)inhibition of ascent and a reduction in convection over the up-shear sector allow moistening of the boundary-layer air,which is transported to the down-shear sector to feed a developing convective asymmetry;(b)with minimal ventilation,undiluted clouds and moisture from the down-shear left quadrant are then wrapped inwards to the up-shear left quadrant to form the eyewall cloud;and(c)this process seems related to a critical down-shear tilt of the vortex from midlevels,and the vertical phase-locking of the circulation over up-shear *** the member that forecasts a much-delayed RI,these processes are inhibited by stronger vertical wind shear,initially resulting in poor vertical coherence of the circulation,lesser moisture and larger *** analysis suggests that ensemble prediction is needed to account for the sensitivity of forecasts to a relatively narrow range of environmental wind shear,moisture and vortex inner-structure.

关键词： typhoons rapid intensification ensemble simulation spin-up processes ventilation vertical wind shear

Summer Asian-Pacific Oscillation and Its Relationship with Atmospheric Circulation and Monsoon Rainfall

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Acta meteorologica Sinica 2008年第4期22卷 455-471页

作者：赵平陈军明肖栋南素兰邹燕周波涛 State key laboratory of severe weather Chinese Academy of Meteorological Sciences Institute of Climate System Chinese Academy of Meteorological Sciences National Climate Center China Meteorological Administration

Using the ERA-40 data and numerical simulations, this study investigated the teleconnection over the extratropical Asian-Pacific region and its relationship with the Asian monsoon rainfall and the climatological characteristics of tropical cyclones over the western North Pacific, and analyzed impacts of the Tibetan Plateau （TP） heating and Pacific sea surface temperature （SST） on the teleconnection. The Asian-Pacific oscillation （APO） is defined as a zonal seesaw of the tropospheric temperature in the midlatitudes of the Asian-Pacific region. When the troposphere is cooling in the midlatitudes of the Asian continent, it is warming in the midlatitudes of the central and eastern North Pacific; and vice versa. The APO also appears in the stratosphere, but with a reversed phase. Used as an index of the thermal contrast between Asia and the North Pacific, it provides a new way to explore interactions between the Asian and Pacific atmospheric circulations. The APO index exhibits the interannual and interdecadal variability. It shows a downward trend during 1958-2001, indicating a weakening of the thermal contrast, and shows a 5.5-yr oscillation period. The formation of the APO is associated with the zonal vertical circulation caused by a difference in the solar radiative heating between the Asian continent and the North Pacific. The numerical simulations further reveal that the summer TP heating enhances the local tropospheric temperature and upward motion, and then strengthens downward motion and decreases the tropospheric temperature over the central and eastern North Pacific. This leads to the formation of the APO. The Pacific decadal oscillation and El Nino/La Nina over the tropical eastern Pacific do not exert strong influences on the APO. When there is an anomaly in the summer APO, the south Asian high, the westerly jet over Eurasia, the tropical easterly jet over south Asia, and the subtropical high over the North Pacific change significantly, with anomalous Asian

关键词： Asian-Pacific oscillation (APO) atmospheric circulation monsoon rainfall

Impacts of Diurnal Variation of Mountain-plain Solenoid Circulations on Precipitation and Vortices East of the Tibetan Plateau during the Mei-yu Season

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Advances in Atmospheric Sciences 2014年第1期31卷 139-153页

作者： ZHANG Yuanchun SUN Jianhua FU Shenming Institute of Atmospheric Physics Chinese Academy of Sciences Graduate University of the Chinese Academy of Sciences State key laboratory of severe weather Chinese Academy of Meteorological Sciences

Diurnal variations of two mountain-plain solenoid （MPS） circulations associated with ＂first-step＂ terrain [Tibetan Plateau （TP）] and ＂second-step＂ terrain （high mountains between the TP and ＂east plains＂） in china and their influence on the south west vortex （SWV） and the mei-yu front vortex （MYFV） were investigated via a semi-idealized mesoscale numerical model [weather Research and Forecasting （WRF）] simulation integrated with ten-day average fields （mei-yu period of 1-10 July 2007）. The simulations successfully reproduced two MPS circulations related to first and second-step terrain, diurnal vari- ations from the eastern edge of the TP to the Yangtze River-Huaihe River valleys （YHRV）, and two precipitation maximum centers related to the SWV, MYFV. Analyses of the averaged final seven-day simulation showed the different diurnal peaks of precipitation at different regions： from the aftemoon to early evening at the eastern edge of the TP; in the early evening to the next early morning in the Sichuan Basin （SCB）; and in the late evening to the next early morning over the mei-yu front （MYF）. Analyses of individual two-day cases confirmed that the upward branches of the nightlime MPS circulations enhanced the precipitation over the SWV and the MYFV and revealed that the eastward extension of the SWV and its con vection were conducive to triggering the MYFVs. The eastward propagation of a rainfall streak from the eastern edge of the TP to the eastern coastal region was primarily due to a series of convective activities of several systems from west to east, including the MPS between the TP and SCB, the SWV, the MPS between second-step terrain and tile east plains, and the MYFV.

关键词： mountain-plain solenoid (MPS) diurnal variation mei-yu front