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Improved SST-precipitation intraseasonal relationships in the ECMWF coupled climate reanalysis

Feng, X., Haines, K., Liu, C., de Boisséson, E. and Polo, I. (2018) Improved SST-precipitation intraseasonal relationships in the ECMWF coupled climate reanalysis. Geophysical Research Letters, 45 (8). pp. 3664-3672. ISSN 0094-8276

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To link to this item DOI: 10.1029/2018GL077138

Abstract/Summary

The European Centre for Medium-range Weather Forecasts (ECMWF) has produced the ocean-atmosphere coupled reanalysis for the 20th century CERA-20C, following on from the similar, but atmosphere-only, reanalysis ERA-20C. Here we demonstrate the capability of CERA-20C in producing more physically consistent ocean and atmosphere boundary conditions, by focusing on sea surface temperature (SST)-precipitation intra-seasonal relationships. CERA-20C reproduces well the observed SST-precipitation correlations, while these relationships are poorly represented in ERA-20C, with the greatest discrepancies in the early 1900s. The improved relationships in CERA-20C are due to intra-seasonal improvements in SST that are not present in the external HadISST2 product. In CERA-20C, SST-precipitation relationships are slightly weaker in the 1900s than in the 2000s, mainly due to differences in the assimilated observation density. We also find that the coupled model initialized from CERA-20C in the 2000s realistically simulates these relationships, while relaxing SST towards HadISST2 tends to damp these relationships. CERA-20C has improved mean and variance in precipitation over ERA-20C, but these are mostly due to improvements in the atmospheric model and not due to coupled feedbacks.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:76344
Uncontrolled Keywords:General Earth and Planetary Sciences, Geophysics
Publisher:American Geophysical Union

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