Abstract
This study assessed subseasonal global precipitation hindcast quality from all Subseasonal to Seasonal (S2S) prediction project models. Deterministic forecast quality of weekly accumulated precipitation was verified using different metrics and hindcast data considering lead times up to 4 weeks. The correlation scores were found to be higher during the first week and dropped as lead time increased, confining meaningful signals in the tropics mostly due to El Niño–Southern Oscillation and Madden–Julian Oscillation-related effects. The contribution of these two phenomena to hindcast quality was assessed by removing their regressed precipitation patterns from predicted fields. The model’s rank showed ECMWF, UKMO, and KMA as the top scoring models even when using a single control member instead of the mean of all ensemble members. The lowest correlation was shared by CMA, ISAC, and HMCR for most weeks. Models with larger ensemble sizes presented noticeable reduction in correlation when subsampled to fewer perturbed members, showing the value of ensemble prediction. Systematic errors were measured through bias and variance ratio revealing in general large positive (negative) biases and variance overestimation (underestimation) over the tropical oceans (continents and/or extratropics). The atmospheric circulation hindcast quality was also examined suggesting the importance of using a relatively finer spatial resolution and a coupled model for resolving the tropical circulation dynamics, particularly for simulating tropical precipitation variability. The extratropical circulation hindcast quality was found to be low after the second week likely due to the inherent unpredictability of the extratropical variability and errors associated with model deficiencies in representing teleconnections.
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Acknowledgements
We thank the two anonymous reviewers for their constructive comments that were helpful in improving the overall quality of the manuscript. The first author was supported by São Paulo Research Foundation (FAPESP), Grant #2016/18156-5. We also acknowledge the support provided by FAPESP CLIMAX project (2015/50687-8). CASC was supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Process: 304586/2016-1). IFAC thanks CNPq (Process: 308451/2014-7) for research support. We thank NCAR (GPCP precipitation: https://rda.ucar.edu/datasets/ds728.3/; JRA55 reanalysis: https://rda.ucar.edu/datasets/ds628.0/), ECMWF (Hindcasts from S2S database: http://apps.ecmwf.int/datasets/data/s2s; ERA-Interim reanalysis: http://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=pl/), and NOAA (OISST.v2: ftp://ftp.cdc.noaa.gov/Datasets/noaa.oisst.v2.highres/; NCEP-DOE reanalysis 2: ftp://ftp.cdc.noaa.gov/Datasets/ncep.reanalysis2/pressure/; OLR: https://www.esrl.noaa.gov/psd/data/gridded/data.interp_OLR.html) for making available the dataset used in this study. This work is based on S2S data. S2S is a joint initiative of the World Weather Research Programme (WWRP) and the World Climate Research Programme (WCRP). The original S2S database is hosted at ECMWF as an extension of the TIGGE database.
Funding
The first author was supported by São Paulo Research Foundation (FAPESP), Grant #2016/18156-5. CASC (Process: 304586/2016-1) and IFAC (Process: 308451/2014-7) were supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).
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de Andrade, F.M., Coelho, C.A.S. & Cavalcanti, I.F.A. Global precipitation hindcast quality assessment of the Subseasonal to Seasonal (S2S) prediction project models. Clim Dyn 52, 5451–5475 (2019). https://doi.org/10.1007/s00382-018-4457-z
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DOI: https://doi.org/10.1007/s00382-018-4457-z