High-resolution atmospheric reconstruction for Europe 1948–2012: coastDat2

Abstract

Abstract. The coastDat data sets were produced to give a consistent and homogeneous database mainly for assessing weather statistics and climate changes since 1948, e.g., in frequencies of extremes for Europe, especially in data sparse regions. A sequence of numerical models was employed to reconstruct all aspects of marine climate (such as storms, waves, surges, etc.) over many decades. The acronym coastDat stands for the set of consistent ocean and atmospheric data, where the atmospheric data where used as forcing for the reconstruction of the sea state. Here, we describe the atmospheric part of coastDat2 (Geyer and Rockel, 2013; doi:10.1594/WDCC/coastDat-2_COSMO-CLM). It consists of a regional climate reconstruction for the entire European continent, including the Baltic Sea and North Sea and parts of the Atlantic. The simulation was done for 1948 to 2012 with the regional climate model COSMO-CLM (CCLM) and a horizontal grid size of 0.22 degree in rotated coordinates. Global reanalysis data of NCEP1 were used as forcing and spectral nudging was applied. To meet the demands on the coastDat data set about 70 variables are stored hourly. MotivationThe precursor of coastDat2, coastDat1 (Weisse et al., 2009), was widely used. About 50 % of the coastDat1 users were commercial, while 25 % were academic and another 25 % were from the authorities. Applications range from assessing long-term variability and change to risk assessment and design, for example of offshore wind farms. As coastDat1 terminated in 2007, and as there were strong requests for an upgrade comprising the most recent years at higher spatial resolution, the coastDat2 effort was implemented. The atmospheric part of coastDat2 described in this paper was produced with the community model COSMO-CLM on the current super computer of the German Climate Computing Center (DKRZ). It is the successor of the coastDat1 regional atmospheric simulation done with REMO5.0 (Feser et al., 2001;Jacob et al., 2001). For coastal areas the higher resolution is the main advantage. The overall advantage is the availability of the last 5 years. Model setupFor the reconstruction the COSMO model in CLimate Mode (COSMO-CLM) version 4.8_clm_11 Baldauf et al., 2011;Steppeler et al., 2003) was used. The COSMO model is the non-hydrostatic operational weather prediction model applied and further developed by the national weather services affiliated in the COnsortium for SMall-scale MOdeling (COSMO). The climate mode is applied and developed by the Climate Limitedarea Modelling Community (http://www.clm-community. eu). The use of the model is well supported by the members of the community and documented mainly via the COSMO documentation (http://www.cosmo-model.org/ content/model/documentation/core/default.htm).The simulation was done on a regular grid in rotated coordinates with a rotated pole at 170.0• W and 35.0• N with a resolution of 0.22• , a time step of 150 s and hourly output. Figure 1 presents the model domain; 40 vertical levels up to 27.2 km height and 10 soil levels down...

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