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Open AccessArticle

The 10–20 d Low-Frequency Oscillation Characteristics of Summer Precipitation in Eastern China in the Decaying Year of CP ENSO

1
Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science &Technology, Nanjing 210044, China
2
Dafeng Meteorological Service, Yancheng Meteorological Service, Yancheng 224100, China
3
Shanghai Flight Department, China Eastern Airlines, Shanghai 201100, China
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(10), 616; https://doi.org/10.3390/atmos10100616
Received: 6 August 2019 / Revised: 17 September 2019 / Accepted: 25 September 2019 / Published: 11 October 2019
(This article belongs to the Section Climatology and Meteorology)
Using National Centers for Atmospheric Prediction/National Center for Atmospheric Research (NCEP/NCAR) reanalysis data and observational data, the low-frequency oscillation characteristics of precipitation in eastern China during the decaying summer of central Pacific El Niño–Southern Oscillation (CP ENSO) and the corresponding low-frequency atmospheric oscillation characteristic were investigated. The results showed that summer precipitation in eastern China during the decaying year of CP El Niño (La Niña) was more (less) than the climatological mean and that 10–20 d was its dominant period. Low-frequency oscillations at different tropospheric levels had different effects on low-frequency precipitation. In the upper troposphere, Eastern China was dominated by low-frequency divergence and positive (negative) anomaly of low-frequency height during the decaying year of CP El Niño (La Niña), and there was strong (weak) northwest–southeast wave-active flux transport. In the middle troposphere, the range and intensity of the subtropical western Pacific High (SWPH) of CP El Niño was larger and stronger than that of CP La Niña, which may be related to the low-frequency height fields. Meanwhile, the correspnding low-frequency wind field, water vapor circulation systems and moisture transport channels in the lower troposphere, along with the low-frequency vertical movement were significantly different, causing the low-frequency precipitation of CP El Niño to be stronger than CP La Niña. View Full-Text
Keywords: CP ENSO; summer precipitation; low-frequency oscillation CP ENSO; summer precipitation; low-frequency oscillation
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Cai, C.; Wang, L.; Wang, J.; Wang, Z. The 10–20 d Low-Frequency Oscillation Characteristics of Summer Precipitation in Eastern China in the Decaying Year of CP ENSO. Atmosphere 2019, 10, 616.

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