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Contribution of precipitation events with different consecutive days to rainfall change over Asia during ENSO years

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Abstract

The present study investigates the contributions of four types of precipitation events with different consecutive days (1–3-day, 4–7-day, 8–14-day, and over-14 day) of precipitation to April–October rainfall anomalies over Asia and roles of the three factors (intensity, number, duration) in area-mean rainfall anomalies of four types of precipitation events in El Niño and La Niña years. It is found that precipitation tends to be below normal in the entire tropical and extratropical regions except for northeastern Asia and east and west Indochina Peninsula during El Niño years. During La Niña years, precipitation tends to increase in eastern China, India, the south hills of the Himalayas, west Indochina Peninsula-southwest China, and the Maritime Continent, but decreases in northeast China, east Kazakhstan, Afghanistan, and east Indochina Peninsula. The precipitation change at the low latitudinal regions has a larger contribution from the over-14-day events. The number of events is a main factor in changes of precipitation of primary events during El Niño years. The precipitation changes in El Niño and La Niña years are consistent with changes in the activity of cyclonic wind anomalies corresponding to the precipitation events. The intraseasonal wind anomalies leading to the precipitation events in China are preceded by northwestward move of cyclonic systems from the tropical western North Pacific that promotes the start of precipitation in the concerned regions. The present study points to the impacts of intraseasonal wind systems with various lifespans on precipitation changes over Asia in El Niño and La Niña years.

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Data used in the analysis are available on public websites.

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Acknowledgements

Comments from two anonymous reviewers are appreciated. The NCEP-DOE reanalysis data were obtained from https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.html. The authors thank the Research Institute for Humanity and Nature (RIHN) for providing the Asian Precipitation Highly Resolved Observational Data Integration towards the Evaluation of Water Resources (APHRODITE) precipitation data set through its website (www.chikyu.ac.jp/precip/index.html).

Funding

This study is supported by the National Natural Science Foundation of China grants (41721004, 41775080 and 41530425).

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Contributions

Ting You performed the analysis and drafted the paper. Renguang Wu provided the idea, guided the analysis, and revised the paper. Ge Liu and Zhaoyang Chai helped the improvement of the paper.

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Correspondence to Renguang Wu.

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You, T., Wu, R., Liu, G. et al. Contribution of precipitation events with different consecutive days to rainfall change over Asia during ENSO years. Theor Appl Climatol 144, 147–161 (2021). https://doi.org/10.1007/s00704-021-03538-8

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  • DOI: https://doi.org/10.1007/s00704-021-03538-8

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