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Advances in Science and Research The open-access proceedings of the European Meteorological Society (EMS)

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Adv. Sci. Res., 14, 49-61, 2017
https://doi.org/10.5194/asr-14-49-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
29 Mar 2017
Met Éireann high resolution reanalysis for Ireland
Emily Gleeson, Eoin Whelan, and John Hanley Research, Environment and Applications Division, Met Éireann, Dublin, Ireland
Abstract. The Irish Meteorological Service, Met Éireann, has carried out a 35-year very high resolution (2.5 km horizontal grid) regional climate reanalysis for Ireland using the ALADIN-HIRLAM numerical weather prediction system. This article provides an overview of the reanalysis, called MÉRA, as well as a preliminary analysis of surface parameters including screen level temperature, 10 m wind speeds, mean sea-level pressure (MSLP), soil temperatures, soil moisture and 24 h rainfall accumulations. The quality of the 3-D variational data assimilation used in the reanalysis is also assessed. Preliminary analysis shows that it takes almost 12 months to spin up the deep soil in terms of moisture, justifying the choice of running year-long spin up periods. Overall, the model performed consistently over the time period. Small biases were found in screen-level temperatures (less than −0.5 °C), MSLP (within 0.5 hPa) and 10 m wind speed (up to 0.5 m s−1) Soil temperatures are well represented by the model. 24 h accumulations of precipitation generally exhibit a small positive bias of  ∼ 1 mm per day and negative biases over mountains due to a mismatch between the model orography and the geography of the region. MÉRA outperforms the ERA-Interim reanalysis, particularly in terms of standard deviations in screen-level temperatures and surface winds. This dataset is the first of its kind for Ireland that will be made publically available during spring 2017.

Citation: Gleeson, E., Whelan, E., and Hanley, J.: Met Éireann high resolution reanalysis for Ireland, Adv. Sci. Res., 14, 49-61, https://doi.org/10.5194/asr-14-49-2017, 2017.
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This paper is a summary of a very high resolution climate reanalysis carried out for a domain covering Ireland, using the HARMONIE-AROME numerical weather prediction model. Details of the simulations and set-up as well as a preliminary analysis of the main output variables are included in the study.
This paper is a summary of a very high resolution climate reanalysis carried out for a domain...
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