Abstract
A useful sub-seasonal forecast is of great societal and economical value in the highly populated East Asian region, especially during boreal summer when frequent extreme events such as heat waves and persistent heavy rainfalls occur. Despite recent interest and development in sub-seasonal prediction, it is still unclear how skillful dynamical forecasting systems are in East Asia beyond 2 weeks. In this study we evaluate the sub-seasonal prediction over East Asia during boreal summer in the operational monthly forecasting system of Environment and Climate Change Canada (ECCC).Results show that the climatological intra-seasonal oscillation (CISO) of East Asian summer monsoonis reasonably well captured. Statistically significant forecast skill of 2-meter air temperature (T2m) is achieved for all lead times up to week 4 (days 26–32) over East China and Northeast Asia, which is consistent with the skill in 500 hPa geopotential height (Z500). Significant forecast skill of precipitation, however, is limited to the week of days 5–11. Possible sources of predictability on the sub-seasonal time scale are analyzed. The weekly mean T2m anomaly over East China is found to be linked to an eastward propagating extratropical Rossby wave from the North Atlantic across Europe to East Asia. The Madden-Julian Oscillation (MJO) and El Nino-Southern Oscillation (ENSO) are also likely to influence the forecast skill of T2m at the sub-seasonal timescale over East Asia.
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Acknowledgements
This research was jointly supported by a National Meteorological Science and technology innovation project (sub-seasonal to seasonal prediction and climate system model), a Young Talents Special Project of China Meteorological Administration, a Shanghai Meteorological Bureau Research Project (YJ201604) and a CMA Public Welfare Industry (Meteorological) Research Project (GYHY201406001). This study was conducted when P. Liang visited McGill University and was partially supported by a Discovery Grant of the Natural Sciences and Engineering Research Council of Canada. We also thank Prof. Jacques Derome for helpful discussions.
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Liang, P., Lin, H. Sub-seasonal prediction over East Asia during boreal summer using the ECCC monthly forecasting system. Clim Dyn 50, 1007–1022 (2018). https://doi.org/10.1007/s00382-017-3658-1
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DOI: https://doi.org/10.1007/s00382-017-3658-1