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Circulation system configuration characteristics of four rainfall patterns in summer over the East China

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Abstract

In this study, the simultaneous atmospheric circulation system configuration characteristics of the four rainfall patterns (FRP) over the East China during the period 1951–2015 are analyzed in order to investigate their formation mechanisms. The results confirm that the FRP possess obvious differences in the upper-level, middle-level, and lower-level troposphere. In northern China rainfall pattern (NCP) years, the East Asian subtropical westerly jet stream (EAJS) shows a northward trend, with a higher intensity than normal; the blocking high (BH) in the mid-high latitudes is inactive; and the western Pacific subtropical high (WPSH) tends to be stronger, with a location to the north of its normal position. The East Asian summer monsoon (EASM) is stronger, which promotes vapor transport to northern China, and this leads to increased rainfall. In intermediate rainfall pattern (IRP) years, the EAJS position is close to that in normal years; the BH is inactive; the WPSH tends to be weaker, with a location to the east of its normal position; and the EASM is stronger, which is conducive to increased rainfall over the Huaihe River Basin. In Yangtze River rainfall pattern (YRP) years, the circulations are found to be almost opposite in their features to those in NCP years. In South China rainfall pattern (SCP) years, the circulations are found to be almost opposite in their features to those in IRP years. This leads to increased rainfall over South China. Therefore, the different circulation system configuration characteristics lead to the different rainfall patterns.

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Acknowledgments

This work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 41505061, 41530531, and 41375069), the Special Scientific Research Fund of Public Welfare Profession of China (Grant No. GYHY201306021), and the Science and Technology Plan Projects in Liaoning Province (Grant No. 2015103038).

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Correspondence to Junhu Zhao.

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Zhao, J., Yang, L. & Feng, G. Circulation system configuration characteristics of four rainfall patterns in summer over the East China. Theor Appl Climatol 131, 1211–1219 (2018). https://doi.org/10.1007/s00704-017-2047-3

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  • DOI: https://doi.org/10.1007/s00704-017-2047-3

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