AbstractGlobal reanalyses are powerful tools to study the recent climate. They are built by combining forecast models with observations through data assimilation, which provide us complete spatial and temporal information of observable and unobservable parameters. The reanalyses constitute very valuable three-dimensional data of the atmosphere, which allows to investigate a panoply of atmospheric processes, such as coastal low-level jets (CLLJs). In the present study, three global reanalyses, the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Reanalysis (ERA-Interim), the Japanese 55-year Reanalysis (JRA-55) and the Modern Era Retrospective-analysis for Research and Applications (MERRA-2), are used to build an ensemble of reanalyses, for a period encompassing 1980-2016 with 6-hourly output. A detailed global climatology of CLLJs is presented based on this reanalyses ensemble. This reanalysis ensemble allows to explore the ability of reanalysis to represent the CLLJs mitigating its uncertainty and adding robustness. The annual and diurnal cycle as well as the inter-annual variability are analysed in order to evaluate the temporal variability of frequency of occurrence of CLLJ. The ensemble mean displays a good representation of the seasonal spatial variability of frequency of occurrence of coastal jets. The Oman and Benguela CLLJs show, respectively, a decrease and increase of frequency of occurrence in the studied period, which are statistically significant during boreal summer and austral spring. The coastal jets have higher mean frequencies of occurrences during late afternoon and early evening. During the season where each CLLJs have higher mean frequency of occurrence, the Oman CLLJ is the most intense and occurs at higher altitudes.
Journal of Climate – American Meteorological Society
Published: Dec 1, 2017
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