DOWA_and_KNW_domains_and_orography_wide

Data info

Domain

A 10 year ERA5-HARMONIE (Cycle 40h1.2tg2) re-analyses was made and saved on a domain of 789 by 789 points centered around Cabauw (yellow area in figure below). Specifically for the DOWA project a dedicated set of output files was created for a smaller subdomain (red area in the figure below). Both the whole domain and the domain made publicly available are larger in the DOWA than in the KNW-atlas (see figure 1).

DOWA and KNW domains

Figure1. ERA5-HARMONIE domain (yellow) of 789x789 points and DOWA-subdomain of 217x234 points (red). ERA-Interim-HARMONIE domain of 500x500 points (green) and KNW-subdomain of 170x188 points (blue).

Variables

The list of variables saved for the DOWA-subdomain is given below. Where mentioned the 17 height levels refer to: 10, 20, 40, 60, 80, 100, 120, 140, 150, 160, 180, 200, 220, 250, 300, 500 and 600m and the 3 extra height levels to:  1000, 3000 and 6000m.

Variables that are made publicly available through the KNMI Data Centre and are validated in the DOWA-project:

  • Wind speed at 17 height levels
  • Wind direction at 17 height levels

Variables that are made publicly available through the KNMI Data Centre, but are not validated in the DOWA-project:

  • Air pressure at 17 height levels
  • Air temperature at 17 height levels
  • Relative humidity at 17 height levels

Variables that are not made publicly available through the KNMI Data Centre and are not validated in the DOWA-project, but can be made available for research purposes by KNMI for an administration fee:

  • Air pressure at mean sea level
  • Surface air pressure
  • Air pressure at 3 extra height levels
  • Sea surface temperature
  • Air temperature at 2m
  • Air temperature at 3 extra height levels
  • Surface eastward and northward wind (distinction inland water and sea) relative to the model grid (Eastward and northward wind relative to Lambert Conformal Conic (LCC) grid, which is the map projection used for the model grid. The u and v are relative to this grid. To get u and v relative to the geographical grid they need to be rotated. The exact rotation differs per grid point).
  • Eastward wind speed of gust relative to LCC-grid
  • Northward wind speed of gust relative to LCC-grid
  • Wind speed at the 3 extra levels
  • Wind direction at the 3 extra levels
  • Relative humidity at 2m
  • Relative humidity at the 3 extra levels
  • Precipitation amount
  • Surface roughness length
  • Surface roughness length for heat in air
  • Accumulated surface downward eastward stress relative to the model grid
  • Accumulated surface downward northward stress relative to the model grid
  • Rainfall amount
  • Snowfall amount
  • Turbulent kinetic energy at 20 height levels
  • Graupel amount

For 2016 and 2017 and 12 locations (see figure 2) there are additional variables (vertical profiles and large-scale dynamic tendencies of the wind components, temperature and specific humidity) made available to enable LES downscaling of HARMONIE using the “large scale or dynamic tendency method”. The information is stored as a single column and 10x10 km and 30x30km averages.

LES-simulations with nudging method

Figure 2. 2017 additional variables (1 column, 10x10 km averages, 30x30 km averages) made available to enable LES-simulations with the nudging method. Can be made available via KNMI for an admission fee.

Partners

  • ECN part of TNO
  • KNMI
  • Whiffle