Dataset Open Access

MERIDA - MEteorological Reanalysis Italian DAtaset

Riccardo Bonanno; Matteo Lacavalla; Simone Sperati

The new MEteorological Reanalysis Italian DAtaset (MERIDA) has been developed to cope with the increasing weather extremes of the last 20 years, which caused several disruptions to the Italian electric system. This work has been developed following the indications emerged from the “Resilience Working Table” set up by the Italian Regulatory Authority for Energy, Networks and the Environment (ARERA). MERIDA is able to respond to the energy stakeholders, who need reliable meteorological data to implement effective adaptation strategies to operate the electric system safely.

MERIDA consists of a dynamical downscaling of the ERA5 global reanalysis using the mesoscale model WRF-ARW. ERA5 data are retrieved with a 3-hourly temporal resolution to assure good temporal consistency. Temperature data from the SYNOP Air Force stations are also retrieved to be ingested in the WRF simulations at 3-hourly temporal resolution.

The computational domain of MERIDA consists of 2 grids with horizontal resolution of 21 km and 7 km respectively, with the internal grid centered over Italy.

The meteorological fields of MERIDA are open access and distributed in NETCDF file format on a regular lat-lon grid of 0.07° resolution.

A subset of the dataset is available here for download for the period 2000-2018. The full dataset covering the period 1990-2019, and continuoulsy updated, is available at the following website: http://merida.rse-web.it/ 

The following subset of meteorological fields is available here for download:

  • T2 - 2m temperature (K)
  • PREC - Total Precipitation (mm/h)
  • U10 - 10m u-component of wind (m/s)
  • V10 - 10m v-component of wind (m/s)
  • PSFC - Surface pressure (Pa)
  • Q2 - 2m Specific Humidity (Kg/Kg)
  • SWDIR - Direct global short-wave radiation (W/m2)
  • SWDIF - Diffuse global short-wave radiation (W/m2)
  • MSLP - Mean Sea Level Pressure (Pa)
  • SNEQV - Snow Water Equivalent (mm)
  • SOIL_T - Soil Temperature - Layer 5 cm (K)
  • SOIL_M - Soil Moisture - Layer 5 cm (m3/m3)

The following variables are available under request:

  • SOIL_T - Soil Temperature (K, Layers: 5,25,70,150 cm)
  • SOIL_M - Soil Moisture - Layer 5 cm (m3/m3, Layers: 5,25,70,150 cm)
  • TT - Temperature (K, Pressure levels: 850,700,500 hPa)
  • RH - Relative Humidity (%, Pressure levels: 850,700,500 hPa)
  • GHT - Geopotential Height (gpm, Pressure levels: 850,700,500 hPa)
  • UU - u-component of wind (m/s, Pressure levels: 850,700,500 hPa)
  • VV - v-component of wind (m/s, Pressure levels: 850,700,500 hPa)
  • TG - Ground Temperature (K)
  • HFX - Sensible Heat Flux (W/m2)
  • LH - Latent Heat Flux (W/m2)
  • GRDFLX - Ground Flux (W/m2)
  • TR - Transpiration Flux (W/m2)

All the variables not included for download may be downloaded at : http://merida.rse-web.it/

or requested at:

  • riccardo.bonanno@rse-web.it
  • matteo.lacavalla@rse-web.it
  • simone.sperati@rse-web.it

 

This work has been financed by the Research Fund for the Italian Electrical System in compliance with the Decree of Minister of Economic Development 16 April 2018.
Files (96.9 GB)
Name Size
MERIDA_LWRAD.tar.gz
md5:4ea5586e73bd0ce9673c0ca150d1ce44
5.9 GB Download
MERIDA_MSLP.tar.gz
md5:d798700b0d01d39f9ab531f0244d865f
9.2 GB Download
MERIDA_PREC.tar.gz
md5:4b771c6a51a8ca09068bec182f5387a4
3.1 GB Download
MERIDA_PSFC.tar.gz
md5:fd285c4a43838de0e4395448a9bcd8c4
8.6 GB Download
MERIDA_Q2.tar.gz
md5:1489a949828bfd3d8ddf8b5da429c128
10.5 GB Download
MERIDA_SNEQV.tar.gz
md5:b6efd16fd2c2272d7a1d62ba0b43f643
1.3 GB Download
MERIDA_SOIL_M.tar.gz
md5:3ab251129099e8b42130062d420cbf41
6.1 GB Download
MERIDA_SOIL_T.tar.gz
md5:d610f554059818fece66c552e687678c
5.9 GB Download
MERIDA_SWDDIF.tar.gz
md5:6c6a786e6959ee5d9562703049b63ae8
4.9 GB Download
MERIDA_SWDDIR.tar.gz
md5:2f839c8a8020571a1c6d01a0e757e7c2
4.4 GB Download
MERIDA_T2.tar.gz
md5:5340b37a4312e9639eff924393259d84
9.8 GB Download
MERIDA_U10.tar.gz
md5:692d0a161bc02b50649dd07aa97a3ae2
13.6 GB Download
MERIDA_V10.tar.gz
md5:35fff9ccf887a79c8449b9a28f4a5fe8
13.5 GB Download
  • Bonanno R, Lacavalla M, Sperati S. A new high-resolution Meteorological Reanalysis Italian Dataset: MERIDA. Q J R Meteorol Soc. 2019;1–24. https://doi.org/10.1002/qj.3530

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