ERA5_precipitation_sum_1950_2023

ERA5-Land is a reanalysis dataset that provides a consistent view of the evolution of terrestrial variables over decades at a higher resolution than ERA5, which was generated by replaying the terrestrial component of the ERA5 climate reanalysis of ECMWF. The reanalysis uses the laws of physics to combine model data with observations from around the world to produce a globally complete and consistent dataset. The reanalysis produces data that goes back decades and provides an accurate picture of past climate. The dataset includes all 50 variables available on the CDS. The asset is a monthly summary of the ECMWF ERA5 Land hourly asset, including both mobile and non-mobile bands. The mobile bands are created by collecting data from the first hour of the second day of each day of the month and adding them together, while the non-mobile bands are created by averaging all hourly data for the month. The flow bands are labelled with the ‘_sum’ identifier, which is different from the monthly data generated by the Copernicus Climate Data Store, which also averages the flow bands. When sub-monthly fields are not required, monthly totals have been pre-calculated for many applications that require easy and quick access to the data. ERA5-Land monthly summary data are available in real time from 1950, three months before the present. More information can be found in the Copernicus Climate Data Repository. Precipitation and other flow (accumulation) bands may occasionally have negative values that are physically unreasonable. Sometimes their values may be too high. This problem is caused by the way the GRIB format saves data: it simplifies or ‘packages’ the data into smaller, less precise numbers, which can lead to errors. These errors are made worse when the data changes a lot. As a result, when we look at a whole day's worth of data to calculate daily totals, sometimes the highest rainfall recorded at one time appears to be greater than the total rainfall measured throughout the day.