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Directive (EU) 2016/2284 on the reduction of national emissions of certain atmospheric pollutants[1] (“the NEC Directive” or NECD) states in Article 5(2) that:
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The temperature and precipitation data are obtained from the monthly mean ERA5 catalogue entry* [2] in the Copernicus Climate Data Store (CDS). All CDS data are freely available and accessible for everyone to use. The data used are:
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More information on the variables is available in the catalogue documentation available through the link to the catalogue provided below.
*(https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means)
Methodology
The application performs the following steps for calculating the below threshold years for temperature:
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- Step 1: Retrieve the monthly mean precipitation data for June, July, and August (JJA) over Europe (area: 34-72N; -25-45E) for each year between 1991-present from the CDS catalogue entry.
- Step 2: Calculate the sum of the precipitation over JJA for each year for each grid point (temporal dimension).
- Step 3: Calculate the Member State median JJA precipitation for each year using the data from step 2 above (spatial dimension).
- Step 4: Estimate the 10th percentile over the reference period (1991-2020) for each year and for each Member State.
- Step 5: Identify the years that fall below the 10th percentile estimated in step 4 and mark them as below the threshold years.
References
- https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv%3AOJ.L_.2016.344.01.0001.01.ENG
- https://cds.climate.copernicus.eu/cdsapp#!/dataset/reanalysis-era5-single-levels-monthly-means
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This document has been produced in the context of the Copernicus Climate Change Service (C3S). The activities leading to these results have been contracted by the European Centre for Medium-Range Weather Forecasts, operator of C3S on behalf of the European Union (Delegation agreement signed on 11/11/2014). All information in this document is provided "as is" and no guarantee or warranty is given that the information is fit for any particular purpose. The users thereof use the information at their sole risk and liability. For the avoidance of all doubt , the European Commission and the European Centre for Medium - Range Weather Forecasts have no liability in respect of this document, which is merely representing the author's view. |
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