Abstract
Sea surface temperatures (SSTs) are often used for the development of hydro-climatic variable forecasts based on teleconnection methods. Such methods rely on projections or linear combinations of teleconnection indices [e.g. El Niño-Southern Oscillation (ENSO)] and other predictor fields. This study introduces a new hydro-climatic forecasting method identifying SST “dipole” predictors motivated by major teleconnection patterns. An SST dipole is defined as a function of average SST anomalies over two oceanic areas of specific sizes and geographic locations. An optimization algorithm is developed to search for the most significant SST dipole predictors of an external hydro-climatic series based on the Gerrity Skill Score. The significant dipoles are cross-validated and used to generate multiple forecast values. The new method is applied to the forecasting of seasonal precipitation over the southeast US. Hindcasting results show that significant dipoles related to ENSO as well as other prominent patterns at different lead times can indeed be identified. The dipole method also compares favorably with existing statistical forecasting schemes with respect to multiple skill measures. Furthermore, an operational forecasting framework able to produce ensemble forecast traces and uncertainty intervals that can support regional water resources planning and management is also developed.
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Acknowledgments
This work was sponsored by the Georgia Water Resources Institute. The authors also acknowledge the anonymous reviewers for their comments on (1) the cross validation of the dipole significance and associated forecasts and (2) physical explanation of the identified dipoles.
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Chen, CJ., Georgakakos, A.P. Hydro-climatic forecasting using sea surface temperatures: methodology and application for the southeast US. Clim Dyn 42, 2955–2982 (2014). https://doi.org/10.1007/s00382-013-1908-4
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DOI: https://doi.org/10.1007/s00382-013-1908-4