SPHERA High Resolution Reanalysis over Italy - Hourly surface relative humidity (2-meter height) 2004-2012

SPHERA (High Resolution REAnalysis over Italy)  is a convection-permitting regional reanalysis developed by ARPAE-Emilia Romagna and publicly available. The SPHERA domain covers Italy and the surrounding seas with a horizontal resolution of 2.2km. The temporal coverage corresponds to the period 1995-2020 and the dataset is available at hourly frequency. SPHERA reanalysis was developed using the Numerical Weather Prediction model COSMO (www.cosmo-model.org) nested in the global reanalysis ERA5 produced by ECMWF. Moreover, upper-air and surface observations were assimilated at the convection-permitting scale by the COSMO nudging scheme.

This record reports the hourly surface relative humidity at 2-meter height for the period 2004-2012. The full extension of the dataset over 1995-2020 is available over three different records due to space constraints:

• 1995-2003: https://zenodo.org/uploads/12724026
• 2004-2012: https://zenodo.org/uploads/12724104
• 2013-2020: https://zenodo.org/uploads/12724140

Other fields currently available on Zenodo are the surface air temperature at 2-meter height (also over three different records due to space constraints):

• 1995-2003: https://zenodo.org/records/12567563
• 2004-2012: https://zenodo.org/records/12582246
• 2013-2020: https://zenodo.org/records/12582797

and hourly accumulated total precipitation: https://zenodo.org/records/14617083

Details on the SPHERA dataset production, as well as data verification against surface observations are reported in peer-reviewed publications. See References.