The NAAD (North Atlantic Atmospheric Downscaling) provides a 40-year 3D hindcast of the North Atlantic (10°N-80°N) atmosphere at 14 km (HiRes) and 77 km (LoRes) spatial resolution with 50 levels in the vertical (up to 50 hPa), performed with a regional setting of the WRF-ARW 3.8.1 model for the period from January 1979 to December 2018 and forced by ERA-Interim as a lateral boundary condition. The dataset provides variety of surface and free atmosphere parameters at model levels.
The major focus of NAAD was to develop a high resolution atmospheric dataset which allows a better analysis of sub-synoptic and mesoscale features.
|Horizontal Resolution||14 km||77 km|
|Vertical Resolution||50 hydrostatic pressure-sigma levels (50 hPa top)|
|Timestep (RK3)||30 s||360 s|
|Main physics options|
|Land surface model||Noah LSM|
|Initial & boundary conditions||ERA-Interim|
|SST||ERA-Interim (every 6 hr)|
|Data assimilation||Spectral nudging from PBL (longer than 1100 km)|
The NAAD data provided at a 3-hourly frequency. Each variable available in yearly NetCDF files. The surface data is available as 2D fields on the mass-points, the data at model levels provided at staggered or unstaggered points (Arakawa C-grid) depending on the variable.