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Subseasonal Characteristics of Diurnal Variation in Summer Monsoon Rainfall over Central Eastern China

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  • 1 LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, and Graduate School of Chinese Academy of Sciences, Beijing, China
  • | 2 Beijing Climate Center, and LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China
  • | 3 LaSW, Chinese Academy of Meteorological Sciences, China Meteorological Administration, Beijing, China
  • | 4 Institute for Terrestrial and Planetary Atmospheres, School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York
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Abstract

Subseasonal characteristics of the diurnal variation of the summer monsoon rainfall over central eastern China (25°–40°N, 110°–120°E) are analyzed using hourly station rain gauge data. Results show that the rainfall in the monsoon rain belt is dominated by the long-duration rainfall events (≥7 h) with early-morning peaks. The long-duration rainfall events and early-morning diurnal peaks experience subseasonal movement that is similar to that of the monsoon rain belt. When the monsoon rainfall is separated into the active and break periods, the long-duration early-morning precipitation dominates the active period, which is in sharp contrast to the short-duration (≤6 h) rainfall with leading late-afternoon diurnal peaks during the break period. The combination of different diurnal features of monsoon rainfall in the active and break monsoon periods also explains the less coherent diurnal phases of summer mean rainfall over central eastern China. The cause of the early-morning peak of rainfall during the active monsoon period is discussed.

Corresponding author address: Dr. Rucong Yu, China Meteorological Administration, No. 46, Zhongguancun South Street, Beijing 100081, China. Email: yrc@cma.gov.cn

Abstract

Subseasonal characteristics of the diurnal variation of the summer monsoon rainfall over central eastern China (25°–40°N, 110°–120°E) are analyzed using hourly station rain gauge data. Results show that the rainfall in the monsoon rain belt is dominated by the long-duration rainfall events (≥7 h) with early-morning peaks. The long-duration rainfall events and early-morning diurnal peaks experience subseasonal movement that is similar to that of the monsoon rain belt. When the monsoon rainfall is separated into the active and break periods, the long-duration early-morning precipitation dominates the active period, which is in sharp contrast to the short-duration (≤6 h) rainfall with leading late-afternoon diurnal peaks during the break period. The combination of different diurnal features of monsoon rainfall in the active and break monsoon periods also explains the less coherent diurnal phases of summer mean rainfall over central eastern China. The cause of the early-morning peak of rainfall during the active monsoon period is discussed.

Corresponding author address: Dr. Rucong Yu, China Meteorological Administration, No. 46, Zhongguancun South Street, Beijing 100081, China. Email: yrc@cma.gov.cn

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