Journal
ATMOSPHERE
Volume 10, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/atmos10100616
Keywords
CP ENSO; summer precipitation; low-frequency oscillation
Funding
- National Key R&D Program of China [2018YFC1505804]
- National Natural Science Foundation of China [41975085, 41575081]
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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 Nino-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 Nino (La Nina) 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 Nino (La Nina), 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 Nino was larger and stronger than that of CP La Nina, 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 Nino to be stronger than CP La Nina.
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