Journal
CLIMATE DYNAMICS
Volume 51, Issue 11-12, Pages 4543-4554Publisher
SPRINGER
DOI: 10.1007/s00382-017-3848-x
Keywords
Extreme precipitation; Eastern China; Physics-based empirical model; Seasonal predictability; Seasonal prediction; East Asian summer monsoon
Categories
Funding
- Atmosphere-Ocean Research Center (AORC)
- International Pacific Research Center (IPRC) at University of Hawaii
- National Research Foundation (NRF) of Korea through a Global Research Laboratory (GRL) Grant of the Korean Ministry of Education, Science and Technology (MEST) [2011-0021927]
- Nanjing University of Information Science and Technology (NUIST)
- NUIST-Earth System Modeling Center (ESMC) [174]
- School of Ocean and Earth Science and Technology [1280]
- IPRC [10112]
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Extreme precipitation events have severe impacts on human activity and natural environment, but prediction of extreme precipitation events remains a considerable challenge. The present study aims to explore the sources of predictability and to estimate the predictability of the summer extreme precipitation days (EPDs) over eastern China. Based on the region- and season-dependent variability of EPDs, all stations over eastern China are divided into two domains: South China (SC) and northern China (NC). Two domain-averaged EPDs indices during their local high EPDs seasons (May-June for SC and July-August for NC) are therefore defined. The simultaneous lower boundary anomalies associated with each EPDs index are examined, and we find: (a) the increased EPDs over SC are related to a rapid decaying El Nino and controlled by Philippine Sea anticyclone anomalies in May-June; (b) the increased EPDs over NC are accompanied by a developing La Nina and anomalous zonal sea level pressure contrast between the western North Pacific subtropical high and East Asian low in July-August. Tracking back the origins of these boundary anomalies, one or two physically meaningful predictors are detected for each regional EPDs index. The causative relationships between the predictors and the corresponding EPDs over each region are discussed using lead-lag correlation analyses. Using these selected predictors, a set of Physics-based Empirical models is derived. The 13-year (2001-2013) independent forecast shows significant temporal correlation skills of 0.60 and 0.74 for the EPDs index of SC and NC, respectively, providing an estimation of the predictability for summer EPDs over eastern China.
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