[A-OS14] Continental Oceanic Mutual Interaction - Planetary Scale Material Circulationn

[AOS14-P04] Dynamics of pollen-generating environment determined by flowering synchrony

*Kenji Miki¹ (1.Kyoto University)

Keywords:pollen, flowering synchrony, particle dispersion

The spatial range with the environmental potential of producing high airborne pollen concentrations is defined as the “pollinosisphere”. This study aimed to determine the relationship between the dynamics of pollinosispheres and meteorological factors of each year with high temporal and spatial resolution. We visualized and analysed the dynamics of the pollinosisphere based on the 11-year high spatial density observation data of the atmospheric concentrations of Cryptomeria japonica (C. japonica). The analysis results showed that the pollinosisphere heads northeast with repeated expansion and contraction, and the centre of the pollinosisphere showed a leap to the north in mid-March. In addition, the results indicate that the deviation of the fluctuation of the coordinates of the pollinosisphere before the northward leap is strongly related to the deviation of the relative humidity of the previous year. These results indicate that C. japonica all over Japan distributes the pollen grains produced based on the meteorological conditions of the previous year until mid-March, and the pollen grains are distributed in flowering synchrony after mid-March. These results suggest that nationwide daily scale flowering synchrony has a significant annual impact on human society, and the change in the relative humidity trends caused by, for example, global warming would make the seasonal change in pollen dispersion dynamics of not only C. japonica but also other species less smooth and predictable.