Abstract
SST errors in the tropical Atlantic are large and systematic in current coupled general-circulation models. We analyse the growth of these errors in the region of the south-eastern tropical Atlantic in initialised decadal hindcasts integrations for three of the models participating in the Coupled Model Inter-comparison Project 5. A variety of causes for the initial bias development are identified, but a crucial involvement is found, in all cases considered, of ocean-atmosphere coupling for their maintenance. These involve an oceanic “bridge” between the Equator and the Benguela-Angola coastal seas which communicates sub-surface ocean anomalies and constitutes a coupling between SSTs in the south-eastern tropical Atlantic and the winds over the Equator. The resulting coupling between SSTs, winds and precipitation represents a positive feedback for warm SST errors in the south-eastern tropical Atlantic.
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Acknowledgments
This work was supported by the UK Natural Environment Research Council [NE/J005126/1]. GODAS and NOAA-OI-SST-V2 data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/. EN3 data obtained from http://www.metoffice.gov.uk/hadobs/en3/data/EN3_v2a/download_EN3_v2a.html. The CFSR data was developed by NOAA’s National Centers for Environmental Prediction (NCEP), and were obtained from NOAA’s National Operational Model Archive and Distribution System (NOMADS) which is maintained at NOAA’s National Climatic Data Center (NCDC). ERA-Interim data were obtained from the ECMWF data portal, http://data-portal.ecmwf.int/data/. We acknowledge the World Climate Research Programme’s Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modelling groups (listed in Table 1 of this paper) for producing and making available their model output. For CMIP the U.S. Department of Energy’s Program for Climate Model Diagnosis and Inter-comparison provides coordinating support and led development of software infrastructure in partnership with the Global Organisation for Earth System Science Portals.
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Toniazzo, T., Woolnough, S. Development of warm SST errors in the southern tropical Atlantic in CMIP5 decadal hindcasts. Clim Dyn 43, 2889–2913 (2014). https://doi.org/10.1007/s00382-013-1691-2
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DOI: https://doi.org/10.1007/s00382-013-1691-2