Abstract
This paper sought to chart airborne Quercus pollen counts over the last 20 years in the region of Galicia (NW Spain) with a view to detecting the possible influence of climate change on the Quercus airborne pollen season (APS). Pollen data from Ourense, Santiago de Compostela, Vigo and Lugo were used. The Quercus airborne pollen season was characterized in terms of the following parameters: pollen season start and end dates, peak pollen count, pollen season length and pollen index. Several methods, dates and threshold temperatures for determining the chill and heat requirements needed to trigger flowering were applied. A diverse APS onset timing sequence was observed for the four cities as Quercus flowers few days in advance in Vigo. The variations observed could be related to differences in the meteorological conditions or the thermal requirements needed for flowering. Thermal requirements differed depending on local climate conditions in the study cities: the lowest values for chilling accumulation were recorded in Vigo and the highest in Lugo, whereas the lowest heat accumulation was achieved in Vigo. Differences in APS trends between cities may reflect variations in weather-related trends. A significant trend towards rising Quercus pollen indices and higher maximum daily mean pollen counts was observed in Ourense, linked to the more marked temperature increase across southern Galicia. A non-uniform trend towards increased temperatures was noted over the study period, particularly in late summer and early autumn in all four study cities. Additionally, an increase in spring temperatures was observed in south-western Galicia.
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Airborne Quercus pollen count study over the last 20 years in the NW Spain with a view to detecting the possible influence of climate change.
A trend to an increase of the Quercus pollen was observed in Ourense.
A non-uniform heating through the year in the studied years was observed.
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Jato, V., Rodríguez-Rajo, F.J., Fernandez-González, M. et al. Assessment of Quercus flowering trends in NW Spain. Int J Biometeorol 59, 517–531 (2015). https://doi.org/10.1007/s00484-014-0865-x
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DOI: https://doi.org/10.1007/s00484-014-0865-x