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anomalous circulation Patterns in Association with Two Types of Daily Precipitation Extremes over Southeastern China during Boreal Summer

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Journal of Meteorological Research 2016年第2期30卷 183-202页

作者：李明刚管兆勇金大超韩洁张茜 Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science & Technology Nanjing 210044 State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science & Technology Nanjing 210044 Meteorological Administration of Baoji Baoji 721006

Based on the daily rainfall data from China Meteorological Administration,the tropical cyclone（TC） best track data from Japan Meteorological Agency,and the NCEP-NCAR reanalysis data from NOAA,regional mean daily precipitation extreme（RDPE） events over southeastern China（specifically,the Fujian-Jiangxi region（FJR）） and the associated circulation anomalies are *** the summers of 1979-2011,a total of 105 RDPE events are identified,among which 35 are TC-infiuenced（TCIn-RDPE） and 70 are TCfree events（TCFr-RDPE）.Distinct differences between these two types of RDPEs are found in both their statistical features and the related circulation ***-RDPEs usually occur in June,while TCInRDPEs mainly take place during *** TCFr-RDPEs happen,a center of the anomalous cyclonic circulation is observed over the FJR,with an anomalous anticyclonic circulation to the south of this *** warm/moist air flows from the South China Sea（SCS） and western Pacific meet with colder air from the north,forming a narrow convergent belt of water vapor over the ***,positive diabatic forcing anomalies are observed over the FJR,whereas negative anomalies appear over both its south and north sides,facilitating the formation and maintenance of the cyclonic circulation anomaly,as well as the upward motion of the atmosphere,over the *** TCIn-RDPEs occur,southeastern China is dominated by a TC-related stronger anomalous cyclonic *** anomalous anticyclonic circulation in the mid and high latitudes north of the FJR exists in the mid and upper troposphere,opposite to the situation during TCFr-RDPE *** warm/wet air is carried into the FJR from both the Indian Ocean and the SCS,leading to a large amount of latent heat release over the FJR and inducing strong ascending motion ***,large differences are also found in the manifestation of Rossby wave energy propagation between these two types of RDPE *** results of

关键词： Fujian-Jiangxi region regional daily precipitation extreme anomalous circulation tropical cyclone

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Modulation of Madden-Julian Oscillation Activity by the Tropical Pacific-Indian Ocean Associated Mode

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Advances in Atmospheric Sciences 2020年第12期37卷 1375-1388页

作者： Lifeng LI Xin LI Xiong CHEN Chongyin LI Jianqi ZHANG Yulong SHAN College of Meteorology and Oceanography National University of Defense TechnologyNanjing 211101China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

In this study,the impacts of the tropical Pacific–Indian Ocean associated mode(PIOAM)on Madden–Julian Oscillation(MJO)activity were investigated using reanalysis *** the positive(negative)phase of the PIOAM,the amplitudes of MJO zonal wind and outgoing longwave radiation are significantly weakened(enhanced)over the Indian Ocean,while they are enhanced(weakened)over the central and eastern *** eastward propagation of the MJO can extend to the central Pacific in the positive phase of the PIOAM,whereas it is mainly confined to west of 160°E in the negative *** PIOAM impacts MJO activity by modifying the atmospheric circulation and moisture *** ascending(descending)motion and positive(negative)moisture anomalies occur over the western Indian Ocean and central-eastern Pacific(Maritime Continent and western Pacific)during the positive phase of the *** anomalous circulation is almost the opposite in the negative phases of the *** anomalous circulation and moisture can modulate the activity of the *** stronger moistening over the Indian Ocean induced by zonal and vertical moisture advection leads to the stronger MJO activity over the Indian Ocean in the negative phase of the *** the positive phase of the PIOAM,the MJO propagates farther east over the central Pacific owing to the stronger moistening there,which is mainly attributable to the meridional and vertical moisture advection,especially low-frequency background state moisture advection by the MJO’s meridional and vertical velocities.

关键词： tropical Pacific-Indian Ocean associated mode MJO moisture budget analysis anomalous circulation

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ANALYSIS ON EFFECT OF SOUTH ASIA HIGH ON MID-SUMMER EXTREME DROUGHT AND FLOOD IN SICHUAN-CHONGQING REGION

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Journal of Tropical Meteorology 2014年第2期20卷 163-172页

作者：陈永仁李跃清齐冬梅 Institute of Plateau Meteorology China Meteorological Administration Sichuan Provincial Meteorological Observatory

NCEP/NCAR data are utilized to analyze an extreme flood year(1998) and an extreme dry year(2006) in the Sichuan-Chongqing region(SCR) and the results are as follows. The positive divergence of South Asia High(SAH) is stronger in the flood year; the position of the ridge line of SAH is southward compared with the annual average; Western Pacific Subtropical High(WPSH) extends westward and its ridge line is southward. In the drought year, the positive divergence of SAH is weaker, its ridge line is northward, and the position of WPSH is also northward. As shown in the dynamics, in drought(flood) years, negative(positive) vorticity advection in the upper atmosphere can cause the atmosphere to ascend(descend), and anomalous circulation of SAH displays divergence(convergence), and anomalous circulation of the lower atmosphere shows convergence(divergence). Thermal structure of the atmosphere shows that there is warm(cold) temperature advection in the lower atmosphere, and the vertical distribution of diabetic heating causes SAH's local circulation to display convergence(divergence) and affects vertical motion of the lower atmosphere circulation eventually. To some extent, the two extreme years in the SCR is closely related to the vertical motion of atmosphere circulation and the variation of such vertical motion is caused by differences of interactions between SAH and lower atmosphere circulations.

关键词： Sichuan-Chongqing region South Asia High(SAH) characteristics of drought and flood anomalous circulation

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The boreal spring stratospheric final warming and its interannual and interdecadal variability

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Science China Earth Sciences 2014年第2期57卷 710-718页

作者： HU JingGao REN RongCai YU YueYue XU HaiMing College of Atmospheric Sciences Nanjing University of Information Science & Technology State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG) Institute of Atmospheric PhysicsChinese Academy of Sciences

Based on the daily NCEP/DOE reanalysis II data,dates of the boreal spring Stratospheric Final Warming(SFW) events during 1979–2010 are defined as the time when the zonal-mean zonal wind at the central latitudes(65°–75°N) of the westerly polar jet drops below zero and never recovers until the subsequent *** is found that the SFW events occur successively from the mid to the lower stratosphere and averagely from the mid to late April with a temporal lag of about 13 days from 10 to 50 *** the past 32 years,the earliest SFW occurs in mid March whereas the latest SFW happens in late May,showing a clear interannual variability of the time of *** the SFW onset,the stratospheric circulation transits from a winter dynamical regime to a summertime state,and the maximum negative tendency of zonal wind and the strongest convergence of planetary-wave are *** results show that the early/late SFW events in boreal spring correspond to a quicker/slower transition of the stratospheric circulation,with the zonal-mean zonal wind reducing about 20/5 m s-1 at 30 hPa within 10 days around the onset ***,the planetary wave activities are relatively strong/weak associating with an out-of-/in-phase circumpolar circulation anomaly before and after the SFW events in the *** these results indicate that,the earlier breakdown of the stratospheric polar vortex(SPV),as for the winter stratospheric sudden warming(SSW) events is driven mainly by wave forcing;and in contrast,the later breakdown of the SPV exhibits more characteristics of its seasonal ***,after the breakdown of SPV,the polar temperature anomalies always exhibit an out-of-phase relationship between the stratosphere and the troposphere for both the early and late SFW events,which implies an intimate stratosphere–troposphere dynamical coupling in *** addition,there exists a remarkable interdecadal change of the onset time of SFW in the mid *** aver

关键词： stratospheric final warming onset date wave activity anomalous circulation

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