Abstract
To investigate airborne pollen movement aerobiologists use backward air mass trajectories. In the present paper the peculiarities of airborne birch pollen dispersion are analysed. In 2005 at Šiauliai Aerobiology Station pollen was recorded using Hirst‐type spore trap. The situation of birch bloom in neighbouring European countries was evaluated according to the European Aeroallergen Network database. It was generalized and used to prove long‐range pollen transport. Air mass trajectories were calculated according to the HYSPLIT 4 model the trajectory drawing principle of which is based on the integration of the position of air mass with regard to time. The present study has shown that backward air mass trajectory analysis may be applied in investigating relationship among pollen dispersion, meteorological conditions and air mass transport. It is estimated that at Šiauliai Aerobiology Station the dynamics of pollen concentration is determinated by local flora and airborne pollen long‐range transport. The evaluation of pollen dispersion by the backward air mass trajectory method presented in the paper established precondition to look for possibilities of application of the HYSPLIT 4 model to prepare the forecasts of pollen dispersion.
Highlights
Investigaions into the dynamics of airborne birch (Betula L.) pollen are performed in many European states [1,2,3,4]
This study has shown that backward trajectory analysis can be used to investigate specific pollen episodes
Evaluation of pollen dispersion by the backward air mass trajectory method presented in the paper established the precondition to look for possibilities of application of the HYSPLIT 4 model to prepare the forecasts of pollen dispersion
Summary
Investigaions into the dynamics of airborne birch (Betula L.) pollen are performed in many European states [1,2,3,4]. The attention of aerobiologists, botanists, planters, clinicists to this biological kind of air pollution has appeared because of large amounts of pollen dispersed during bloom period and decreasing life quality of the part of human population. The periods of birch pollination at different aerobiology stations in Lithuania were evaluated [7], but the influence of longrange transport on pollen dynamics was not shown. Airborne pollen dispersion may be forecast having evaluated biological features of a plant, climate factors and circulation of the atmosphere. For the forecasts, it is not less important to identify the beginning of bloom of the plant that is changing year after year and is partially determined by meteorological factors in the period of blossom formation [5]
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