EMD-Global Wind Data (based on ERA-Interim)
The "EMD-Global Wind Data (based on ERA-Interim)" is a global dataset processed by EMD with the purpose of providing a global dataset for use in wind farm projects. It contains wind data (speed and direction) as well as temperatures and pressures at typical wind turbine hub heights from 10 m to 200 m.
Data Source
The "EMD-Global Wind Data (based on ERA-Interim)" dataset is derived and processed from the ERA-Interim dataset. The ERA-Interim data is a recent global reanalysis dataset from the European Centre for Medium-Range Weather Forecasts (ECMWF). The full ERA-Interim reanalysis dataset holds a variety of surface parameters for weather conditions as well as ocean-wave and land-surface conditions. A number of parameters describing the atmospheric conditions are also available. The dataset processed and provided by EMD covers a small processed subset, with focus on parameters relevant for wind-energy purposes.
Usage Notes:
- The EMD-Global Wind Data (based on ERA-Interim) is discontinued from ultimo 2019: The last month with ERA-Interim data was august 2019 as ECMWF has discontinued this dataset and replaced it with the ERA5 Data and ERA5T Data. EMD has ceased to update the EMD-ConWx data as the source data is not avaialble anymore. The EMD-WRF Europe+ (ERA5) dataset is already available as the natural, higher-quality successor for the EMD-ConWx dataset. Find more information here.
- The ERA-Interim dataset has been used as the basis of the European EMD-ConWx Meso Data dataset, which provides reanalyzed ERA-Interim data in an increased spatial resolution. See the details on that dataset here.
Resolution, Coverage and Availability
- Spatial Resolution: The model grid available to external data-users is 0.702 degree latitude and 0.703 degree longitude. Coverage is global.
- Temporal Resolution: It holds four daily values in a period from 1979 until august 2019.
Required Modules / Licenses
To access the ERA time series data the following modules are required within in your WindPRO licence:
- BASIS
- METEO
- MCP
Downloading of the data is unrestricted for licensed users, however a "fair use" policy applies.
Data Processing and Dataset Parameters
EMD International has processed the raw ERA-Interim data by a simple, proprietary downscaling-procedure to provide the data at different physical heights covering 10 m - 200 m. Currently, the following parameters are available in the downloadable time series in WindPRO.
| Parameter | Description |
|---|---|
| time | UTC time stamp (YYYY-MM-DD hh:mm) |
| wSpeed.x | Wind speeds [m/s] at different physical levels (x). Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m |
| wDir.x | Wind directions [Deg] at different physical levels (x). Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m |
| temp.x | Temperatures [Deg C] at different physical levels (x). Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m |
| pressure.x | Pressures [hPa] at different physical levels (x). Heights (x): 10m. 25m, 50m, 75m, 100m, 150m, 200m |
References
An open-access journal paper is available. This paper by D.P.Dee et al., "The ERA-Interim reanalysis: configuration and performance of the data assimilation system" describes the dataset and configurations in more detail. Download your copy in pdf-format here.
External Links
- Homepage of ERA-Interim: http://www.ecmwf.int/en/research/climate-reanalysis/era-interim
- Availability of ERA-Interim data: http://apps.ecmwf.int/datasets/data/interim-full-daily/
Acknowledgement and License
Credits: The European Centre for Medium-Range Weather Forecasts for the ERA-Interim data.
License: This data is distributed according to the license agreement for ECMWF archive products, see here.
Acknowledgement: ECMWF requests that the origin of the ECMWF archive product (ERA-Interim) is acknowledged in any scientific publications arising out of the use of the products (see Section #5 in the ECMWF archive product license conditions).