Multidecadal assessment of the FYRE Climate daily high-resolution surface reanalysis over France (1871-2012)
Authors: Vidal Jean-Philippe , Devers Alexandre , Lauvernet Claire , Vannier Olivier 
Published: March 2021

&lt;p&gt;Surface observations are usually too few and far between to properly assess multidecadal variations at the local scale and characterize historical local extreme events at the same time. A data assimilation scheme has been recently presented by Devers &lt;em&gt;et al.&lt;/em&gt; (2020) to assimilate daily observations of temperature and precipitation into downscaled reconstructions from a global extended reanalysis through an Ensemble Kalman fitting approach and derive high-resolution fields. Recent studies also showed that assimilating observations at high temporal resolution does not guarantee correct multidecadal variations. This work thus proposes (1) to apply this scheme over France and over the 1871&amp;#8211;2012 period based on the SCOPE Climate reconstructions background dataset (Caillouet &lt;em&gt;et al.&lt;/em&gt;, 2019) and all available daily historical surface observations of temperature and precipitation, (2) to develop an assimilation scheme at the yearly time scale and to apply it over the same period and lastly, (3) to derive the FYRE Climate reanalysis, a 25-member ensemble hybrid dataset resulting from the daily and yearly assimilation schemes, spanning the whole 1871&amp;#8211;2012 period at a daily and 8-km resolution over France. Assimilating daily observations only allows reconstructing accurately daily characteristics, but fails in reproducing robust multidecadal variations when compared to independent datasets. Compared to reference homogenized series, FYRE Climate clearly performs better than the SCOPE Climate background in terms of bias, error, and correlation, but also better than the Safran surface reanalysis over France (Vidal &lt;em&gt;et al.&lt;/em&gt;, 2010) available from 1958 onward only. FYRE Climate also succeeds in reconstructing both local extreme events and multidecadal variability. It is made available from http://doi.org/10.5281/zenodo.4005573 (precipitation) and http://doi.org/10.5281/zenodo.4006472 (temperature). Further details on FYRE Climate can be found in Devers &lt;em&gt;et al.&lt;/em&gt; (2021).&lt;/p&gt;&lt;p&gt;Caillouet, L., Vidal, J.-P., Sauquet, E., Graff, B., Soubeyroux, J.-M. (2021) SCOPE Climate: a 142-year daily high-resolution ensemble meteorological reconstruction dataset over France. &lt;em&gt;Earth System Science Data&lt;/em&gt;, 11, 241-260. https://doi.org/10.5194/essd-11-241-2019&lt;/p&gt;&lt;p&gt;Devers, A., Vidal, J.-P., Lauvernet, C., Graff, B., Vannier, O. (2020) A framework for high-resolution meteorological surface reanalysis through offline data assimilation in an ensemble of downscaled reconstructions. &lt;em&gt;Quarterly Journal of the Royal Meteorological Society&lt;/em&gt;, 2020, 146, 153-17. https://doi.org/10.1002/qj.3663&lt;/p&gt;&lt;p&gt;Devers, A., Vidal, J.-P., Lauvernet, C., Vannier, O. (2021) FYRE Climate: A high-resolution reanalysis of daily precipitation and temperature in France from 1871 to 2012. C&lt;em&gt;limate of the Past Discussions&lt;/em&gt;, in review, https://doi.org/10.5194/cp-2020-156&lt;/p&gt;&lt;p&gt;Vidal, J.-P., Martin, E., Franchist&amp;#233;guy, L., Baillon, M., Soubeyroux, J.-M. (2010) A 50-year high-resolution atmospheric reanalysis over France with the Safran system. &lt;em&gt;International Journal of Climatology&lt;/em&gt;, 30, 1627-1644. https://doi.org/10.1002/joc.2003&lt;/p&gt;