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Volume 21, issue 11 | Copyright
Hydrol. Earth Syst. Sci., 21, 5415-5426, 2017
https://doi.org/10.5194/hess-21-5415-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 06 Nov 2017

Research article | 06 Nov 2017

Impact of ENSO regimes on developing- and decaying-phase precipitation during rainy season in China

Qing Cao1, Zhenchun Hao1,2, Feifei Yuan1, Zhenkuan Su1, Ronny Berndtsson3, Jie Hao4, and Tsring Nyima5 Qing Cao et al.
  • 1State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China
  • 2National Cooperative Innovation Center for Water Safety & Hydro-Science, Hohai University, Nanjing, 210098, China
  • 3Department of Water Resources Engineering and Center for Middle Eastern Studies, Lund University, P.O. Box 118, Lund, 22100, Sweden
  • 4Nanjing Hydraulic Research Institute, Nanjing, 210098, China
  • 5Investigation Bureau of Hydrology and Water Resources, Ali, Tibet Autonomous Region, 859000, China

Abstract. This study investigated the influence of five El Niño–Southern Oscillation (ENSO) types on rainy-season precipitation in China: central Pacific warming (CPW), eastern Pacific cooling (EPC), eastern Pacific warming (EPW), conventional ENSO and ENSO Modoki. The multi-scale moving t test was applied to determine the onset and withdrawal of rainy season. Results showed that the precipitation anomaly can reach up to 30% above average precipitation during decaying CPW and EPW phases. Developing EPW could cause decreasing precipitation over large areas in China with 10–30% lower than average precipitation in most areas. Conventional El Niño in the developing phase had the largest influence on ENSO-related precipitation among developing ENSO and ENSO Modoki regimes. Decaying ENSO also showed a larger effect on precipitation anomalies, compared to decaying ENSO Modoki. The difference between rainy-season precipitation under various ENSO regimes may be attributed to the combined influence of anti-cyclone in the western North Pacific and the Indian monsoon. Stronger monsoon and anti-cyclone are associated with enhanced rainy-season precipitation. The results suggest a certain predictability of rainy-season precipitation related to ENSO regimes.

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This study analyzed the rainy-season precipitation in China influenced by various ENSO types. The precipitation anomalies were investigated under different ENSO types, which may be attributed to the combined influence of anti-cyclone in the western North Pacific and the Indian monsoon. The results improve the understanding of linkages between the precipitation and global teleconnection patterns. The results suggest a certain predictability of flood and drought related to different ENSO types.
This study analyzed the rainy-season precipitation in China influenced by various ENSO types....
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