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Two Distinct Types of 10–30-Day Persistent Heavy Rainfall Events over the Yangtze River Valley

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  • 1 a Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China
  • | 2 b Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
  • | 3 c International Pacific Research Center, University of Hawaiʻi at Mānoa, Honolulu, Hawaii
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Abstract

Large-scale circulation anomalies associated with 10–30-day-filtered persistent heavy rainfall events (PHREs) over the middle and lower reaches of the Yangtze River Valley (MLYV) in boreal summer for the period of 1961–2017 were investigated. Two distinct types of PHREs were identified based on configurations of anomalies in the western Pacific subtropical high (WPSH) and South Asian high (SAH) during the peak wet phase. One type, referred to as PSAH, is characterized by eastward extension of the SAH, and the other, referred to as NSAH, featured a westward retreat of the SAH; they both exhibit westward extension of the WPSH. Both types of PHREs are dominated by mei-yu frontal systems. The lower-level circulation anomalies play a crucial role in initiating rainfall but through different processes. Prior to rainfall occurrence, a strong anticyclonic circulation anomaly is over the western North Pacific Ocean (WNP) for the PSAH events and the related southwesterly wind anomaly prevails over southeastern China, which advects moisture into the MLYV, moistens the boundary layer, and induces atmospheric convective instability. For the NSAH events, the WNP anticyclonic circulation is weak while a strong northerly wind is observed north of the MLYV. It brings the cold air mass southward, favoring initiating frontal rainfall over the MLYV. The formation of upper-level circulation anomalies over the MLYV is primarily due to the shift of anomalous circulations from the mid-high latitudes. After the rainfall generation, the precipitation would influence the lower- and upper-level circulation anomalies.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Lu Wang, luwang@nuist.edu.cn

Abstract

Large-scale circulation anomalies associated with 10–30-day-filtered persistent heavy rainfall events (PHREs) over the middle and lower reaches of the Yangtze River Valley (MLYV) in boreal summer for the period of 1961–2017 were investigated. Two distinct types of PHREs were identified based on configurations of anomalies in the western Pacific subtropical high (WPSH) and South Asian high (SAH) during the peak wet phase. One type, referred to as PSAH, is characterized by eastward extension of the SAH, and the other, referred to as NSAH, featured a westward retreat of the SAH; they both exhibit westward extension of the WPSH. Both types of PHREs are dominated by mei-yu frontal systems. The lower-level circulation anomalies play a crucial role in initiating rainfall but through different processes. Prior to rainfall occurrence, a strong anticyclonic circulation anomaly is over the western North Pacific Ocean (WNP) for the PSAH events and the related southwesterly wind anomaly prevails over southeastern China, which advects moisture into the MLYV, moistens the boundary layer, and induces atmospheric convective instability. For the NSAH events, the WNP anticyclonic circulation is weak while a strong northerly wind is observed north of the MLYV. It brings the cold air mass southward, favoring initiating frontal rainfall over the MLYV. The formation of upper-level circulation anomalies over the MLYV is primarily due to the shift of anomalous circulations from the mid-high latitudes. After the rainfall generation, the precipitation would influence the lower- and upper-level circulation anomalies.

© 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).

Corresponding author: Lu Wang, luwang@nuist.edu.cn
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