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Table 3.1: List of variables in the AgERA5 data set
Short name | Long name | Unit | Aggregation | AGROVOC URI |
Cloud_Cover_Mean | Total cloud cover (00-00LT) | (0 - 1) | Mean | |
Dew_Point_Temperature_2m_Mean | 2 meter dewpoint temperature (00-00LT) | K | Mean | |
Preciptation_Flux | Total precipitation (00-00LT) | mm d-1 | Sum | |
Preciptation_Rain_Duration_Fraction | Precipitation type duration - rain (00-00LT) | - | Count | |
Preciptation_Solid_Duration_Fraction | Precipitation type duration - solid fraction (no hail) composed of: precipitation types freezing rain (3), snow (5), wet snow (6), mixture of | - | Count | |
Relative_Humidity_2m_06h | Relative humidity at 06LT | % | - | |
Relative_Humidity_2m_09h | Relative humidity at 09LT | % | - | |
Relative_Humidity_2m_12h | Relative humidity at 12LT | % | - | |
Relative_Humidity_2m_15h | Relative humidity at 15LT | % | - | |
Relative_Humidity_2m_18h | Relative humidity at 18LT | % | - | |
Snow_Thickness_LWE_Mean | Snow liquid water equivalent (00-00LT) | cm of liquid water equivalent | Mean | |
Snow_Thickness_Mean | Snow depth (00-00LT) | cm snow | Mean | |
Solar_Radiation_Flux | Surface solar radiation downwards (00-00LT) | J m-2d-1 | Sum | |
Temperature_Air_2m_Max_24h | Maximum air temperature at 2 meter (00-00LT) | K | Maximum | |
Temperature_Air_2m_Max_Day_Time | Maximum air temperature at 2 meter (06-18LT) | K | Maximum | |
Temperature_Air_2m_Mean_24h | 2 meter air temperature (00-00LT) | K | Mean | |
Temperature_Air_2m_Mean_Day_Tim e |
| K | Mean | |
Temperature_Air_2m_Mean_Night_Ti me |
| K | Mean | |
Temperature_Air_2m_Min_24h | Minimum air temperature at 2 meter (00-00LT) | K | Minimum | |
Temperature_Air_2m_Min_Night_Time | Minimum air temperature at 2 meter (18-06LT) | K | Minimum | |
Vapour_Pressure_Mean | Vapour pressure (00-00LT) | hPa | Mean | |
Wind_Speed_10m_Mean | 10 meter wind component (00-00LT) | m s-1 | Mean |
Product target requirements
DATA DESCRIPTION | |
Horizontal coverage | Global (on a regular latitude-longitude grid) |
Temporal Coverage | 1 January 1979 to present |
Temporal resolution | Daily |
File format | NetCDF 4, Climate and Forecast (CF) Metadata Convention v1.6 |
Data type | Grid |
Horizontal resolution | 0.1° x 0.1° |
Some remarks related to the quality of the AgERA5 data set:
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Currently the AgERA5 is available for the years 1979 to present . The as the remaining ERA5 dataset from 1950 to 1978 was not available during the project. In addition, the preliminary daily updates of the dataset, also called ERAT, were not yet available1 and therefore the processing line was not further developed and tested for this data stream. This relates to deliverable D2.3.2 Calculation of NRT forcing data.
The AgERA5 was bias corrected towards the HRES operational model. It is assumed that the HRES operational model reflects reality best as it is based on an advanced assimilation and spatialization scheme using many quality-controlled observations, satellite imagery, weather balloons etc. However, the AgERA5 data set does not yet represent the agricultural regions within a 0.1 degree grid cell. This requires an extra elevation correction for temperature (average, minimum and maximum air temperature using a lapse rate of 6.5 °C/km) and possibly for humidity. The elevation of agricultural regions could be defined as follows. For example if a 0.1 degree grid cell has more than 5% arable land the elevation could be calculated as the median of all DEM pixels within that grid cell that are under arable land. In case there is less than 5% arable land within the grid cell, the elevation could equal the lower quartile of all DEM pixels under the complete grid cell.
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