Abstract
This paper systematically evaluates the deviations that appear in the hindcasts of the East Asian summer precipitation (EASP) decadal change in the late 1990s in two global coupled models (BCC_CGCM and BCC_CSM). The possible causes for the deviations between the model hindcasts and observations are analyzed. The results show that the hindcasts of EASP by BCC_CGCM and BCC_CSM deviate from observations, with the anomaly correlation coefficient (ACC) being -0.01 and -0.09 for the two models, respectively. The SST anomalies in North and West Pacific and the SST index values predicted by the two models also deviate from the observations, indicating that inconsistent SST fields may be the key factor leading to the deviation in the prediction of the EASP decadal shift. Thus, a dynamic-analogue scheme is proposed to correct the precipitation hindcasts by using SSTs, where SST and EASP are highly correlated, to select historical analogue cases. Cross validations show that the average ACC of the temporal-latitude distribution of the EASP between the corrected hindcasts and observations is 0.18 for BCC_CGCM and 0.02 for BCC_CSM; both are much higher than the uncorrected hindcasts. Applying the dynamic-analogue correction scheme in both models successfully improves prediction of the EASP decadal change in the late 1990s.
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Supported by the National Natural Science Foundation of China (41575082 and 41305075), China Meteorological Administration Special Public Welfare Research Fund (GYHY201306021), and National Basic Research and Development (973) Program of China (2012CB955203).
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Gong, Z., Li, S., Hu, P. et al. Dynamic-analogue correction of the decadal change of East Asian summer precipitation in the late 1990s. J Meteorol Res 30, 341–355 (2016). https://doi.org/10.1007/s13351-016-5220-1
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DOI: https://doi.org/10.1007/s13351-016-5220-1