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Extended-range forecasts of the principal 20–30-day oscillation of the circulation over East Asia during the summer of 2002

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Abstract

Daily 850-hPa meridional wind fields in East Asia from March to September 2002 were used to establish a model of the principal oscillation pattern (POP). This model was then used to conduct independent extended-range forecasts of the principal temporal and spatial variations in the low-frequency meridional wind field on a time scale of 20–30 days. These variations affect the occurrence of heavy precipitation events in the lower reaches of the Yangtze River valley (LYRV). The results of 135 forecast experiments during the summer half year show that the predicted and observed anomalies are strongly correlated at a lead time of 20 days (mean correlation greater than 0.50). This strong correlation indicates that the model is capable of accurately forecasting the low-frequency variations in meridional wind that corresponded to the 3 heavy precipitation events in the LYRV during the summer of 2002. Further forecast experiments based on data from multiple years with significant 20–30-day oscillations show that these prediction modes are effective tools for forecasting the space-time evolution of the low-frequency circulation. These findings offer potential for improving the accuracy of forecasts of heavy precipitation over the LYRV at lead times of 3–4 weeks.

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Authors and Affiliations

  1. Jiangsu Meteorological Institute, Nanjing, 210008, China

    Qiuming Yang  (杨秋明), Yi Li  (李 熠), Juan Song  (宋 娟) & Shicheng Huang  (黄世成)

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  1. Qiuming Yang  (杨秋明)
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  2. Yi Li  (李 熠)
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  3. Juan Song  (宋 娟)
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  4. Shicheng Huang  (黄世成)
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Correspondence to Qiuming Yang  (杨秋明).

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Supported by the National Natural Science Foundation of China (41175082).

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Yang, Q., Li, Y., Song, J. et al. Extended-range forecasts of the principal 20–30-day oscillation of the circulation over East Asia during the summer of 2002. Acta Meteorol Sin 26, 554–565 (2012). https://doi.org/10.1007/s13351-012-0502-8

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  • DOI: https://doi.org/10.1007/s13351-012-0502-8

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