Abstract
Heatwaves can have significant negative socioeconomic impacts and damage ecosystems. Consequently, accurate forecasts of such events are of great importance. In this study, the backward nonlinear local Lyapunov exponent (BNLLE) is used to investigate the local predictability of summer (June, July, and August) heatwave events over south China (SC). The predictability of the summer 2-m temperature (T2m) was quantified first. The results show that the summer T2m has a high predictability, and its predictability limit can reach 12 days, which is close to the upper limit of atmospheric predictability. Nine major heatwave events that occurred over SC were analysed, and their error dynamics and local predictabilities were studied using the BNLLE method. The local predictability limits covered a wide range, varying from 4 to 12 days. Analysis of the forecast error growth and associated rates revealed that the nine major heatwave events showed different error dynamics, thereby leading to the different local predictability limits. In addition, the regional dynamical information associated with these nine heatwave events was investigated and the error dynamics were found to have a heterogeneous spatial distribution. That is, both the error growth and their rates in the northern regions were larger than those in the southern regions. The regional dynamical information associated with the summer T2m also showed the same pattern. Therefore, the northern regions of SC are sensitive to error growth and limit the heatwave forecast skill.
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The TIGGE (The Interactive Grand Global Ensemble) (https://apps.ecmwf.int/datasets/data/tigge/levtype=sfc/type=pf/). The ERA-interim analysis is from https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels?tab=form and (https://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=sfc/), respectively.
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Acknowledgements
We would like to thank Dr. Jie Feng for the discussion. This work is based on TIGGE data. TIGGE (The Interactive Grand Global Ensemble) is an initiative of the World Weather Research Programme (WWRP). This work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 42005054, 42288101 and 41975070), China Postdoctoral Science Foundation (2020M681154) and the Science and Technology Commission of Shanghai Municipality (20dz1200700).
Funding
This work was jointly supported by the National Natural Science Foundation of China (Grant Nos. 42005054,42288101 and 41975070), China Postdoctoral Science Foundation (2020M681154) and the Science and Technology Commission of Shanghai Municipality (20dz1200700).
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The first draft of the manuscript was written by XL. RD and JL commented on initial versions of the manuscript. All authors have read and approved the final manuscript.
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Li, X., Ding, R. & Li, J. Estimating the local predictability of heatwaves in south China using the backward nonlinear local Lyapunov exponent method. Clim Dyn 61, 3605–3618 (2023). https://doi.org/10.1007/s00382-023-06757-z
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DOI: https://doi.org/10.1007/s00382-023-06757-z