Abstract
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 investigated. For the summers of 1979–2011, a total of 105 RDPE events are identified, among which 35 are TC-influenced (TCIn-RDPE) and 70 are TC-free events (TCFr-RDPE). Distinct differences between these two types of RDPEs are found in both their statistical features and the related circulation patterns. TCFr-RDPEs usually occur in June, while TCIn-RDPEs mainly take place during July–August. When 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 region. The 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 FJR. Simultaneously, 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 FJR. When TCIn-RDPEs occur, southeastern China is dominated by a TC-related stronger anomalous cyclonic circulation. An 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 events. Abundant 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 there. Furthermore, large differences are also found in the manifestation of Rossby wave energy propagation between these two types of RDPE events. The results of this study are helpful to deepen our understanding of the mechanisms behind these two types of RDPE events.
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Supported by the China Meteorological Administration Special Public Welfare Research Fund Province (GYHY201406024), National Natural Science Foundation of China (41330425), Creative Program of Science & Technology of Jiangsu (KYZZ_0239 and CXZZ12_0485), and Creative Program of the State Key Laboratory of Severe Weather (2015LASW-A03).
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Li, M., Guan, Z., Jin, D. et al. Anomalous circulation patterns in association with two types of daily precipitation extremes over southeastern China during boreal summer. J Meteorol Res 30, 183–202 (2016). https://doi.org/10.1007/s13351-016-5070-x
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DOI: https://doi.org/10.1007/s13351-016-5070-x