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A timescale decomposed threshold regression downscaling approach to forecasting South China early summer rainfall

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Abstract

A timescale decomposed threshold regression (TSDTR) downscaling approach to forecasting South China early summer rainfall (SCESR) is described by using long-term observed station rainfall data and NOAA ERSST data. It makes use of two distinct regression downscaling models corresponding to the interannual and interdecadal rainfall variability of SCESR. The two models are developed based on the partial least squares (PLS) regression technique, linking SCESR to SST modes in preceding months on both interannual and interdecadal timescales. Specifically, using the datasets in the calibration period 1915–84, the variability of SCESR and SST are decomposed into interannual and interdecadal components. On the interannual timescale, a threshold PLS regression model is fitted to interannual components of SCESR and March SST patterns by taking account of the modulation of negative and positive phases of the Pacific Decadal Oscillation (PDO). On the interdecadal timescale, a standard PLS regression model is fitted to the relationship between SCESR and preceding November SST patterns. The total rainfall prediction is obtained by the sum of the outputs from both the interannual and interdecadal models. Results show that the TSDTR downscaling approach achieves reasonable skill in predicting the observed rainfall in the validation period 1985–2006, compared to other simpler approaches. This study suggests that the TSDTR approach, considering different interannual SCESR-SST relationships under the modulation of PDO phases, as well as the interdecadal variability of SCESR associated with SST patterns, may provide a new perspective to improve climate predictions.

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Authors and Affiliations

  1. Institute of Urban Meteorology, China Meteorological Administration, Beijing, 100089, China

    Linye Song

  2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China

    Linye Song, Wansuo Duan & Jiangyu Mao

  3. Business Intelligence & Data Analytics, Western Power, Perth, WA6000, Australia

    Yun Li

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  1. Linye Song
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  2. Wansuo Duan
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Correspondence to Wansuo Duan.

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Song, L., Duan, W., Li, Y. et al. A timescale decomposed threshold regression downscaling approach to forecasting South China early summer rainfall. Adv. Atmos. Sci. 33, 1071–1084 (2016). https://doi.org/10.1007/s00376-016-5251-7

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