Skilful forecasts of summer rainfall in the Yangtze River Basin from November

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1007/s00376-023-2251-2. This is version 1 of this Preprint.

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Authors

Philip Bett, Nick Dunstone, Nicola Golding, Doug Smith, Chaofan Li

Abstract

Variability in the East Asian Summer Monsoon (EASM) brings the risk of heavy flooding or drought to the Yangtze River Basin, with potentially devastating impacts. Early forecasts of the likelihood of enhanced or reduced monsoon rainfall can enable better management of water and hydropower resources by decision-makers, supporting livelihoods and major economic and population centres across Eastern China. This paper demonstrates that the EASM is predictable in a dynamical forecast model from the preceding November, and that this allows skilful forecasts of summer mean rainfall in the Yangtze River Basin at a lead time of 6 months. Skill for May–June–July rainfall is of a similar magnitude to seasonal forecasts initialised in spring, although the skill in June–July–August is much weaker and not consistently significant. However, there is some evidence for enhanced skill following El Niño events. The potential for decadal-scale variability in forecast skill is also examined, although we find no evidence for significant variation.

DOI

https://doi.org/10.31223/X5N64W

Subjects

Atmospheric Sciences, Climate

Keywords

East Asian Summer Monsoon, flood forecasting, seasonal forecasting, Yangtze basin rainfall

Dates

Published: 2022-10-10 04:27

Last Updated: 2022-10-10 08:27

License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

Data Availability (Reason not available):
Data available on request