European pollen reanalysis, 1980-2022, for alder, birch, and olive, v.1.1

The dataset is the European reanalysis of pollen seasons for alder, birch, and olive. Driven by the European meteorological reanalysis ERA5, the atmospheric composition model SILAM had calculated the flowering and pollen dispersion patterns from these trees for the period of 1980-2022 for Europe. The model used an extended 4-dimensional variational data assimilation (4D-VAR) of daily in-situ pollen observations of aerobiological networks in 33 countries. The aim was to reproduce the inter-annual variability of pollen production and abundance for these trees over entire Europe. The control variable of assimilation was the total pollen release during a flowering season computed independently for each year and type of tree. It was processed to an annual correction factor to the mean productivity of the species. This correction was constant throughout each pollen season but varied in space and between the years. The pollen assimilation had resulted in a consistent improvement of representation of the inter-seasonal variations of seasonal pollen integral SPIn. Note: due to its large size, the dataset is located at the external long-term storage pointed out by the URL below.