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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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