International Journal of Biometeorology

, Volume 30, Issue 4, pp 351–358 | Cite as

Four-hourly fluctuations in grass-pollen concentrations in relation to wet versus dry weather, and to short versus long over-land advection

  • Frits Th. M. Spieksma
  • Joop F. den Tonkelaar


Four-hourly volumetric measurements of airborne grass-pollen concentrations at Leiden, near the west coast of the Netherlands, were analyzed according to wet-versus-dry meteorological conditions in the pollen source area, and according to the distance of the over-land advection to the pollen sampler. Airborne pollen concentrations appear to be low when the source surface is wet by past or present rain, fog, or dew; and high when the source area is dry. Air adverted over long over-land distances from dry source areas contains much pollen, especially in the afternoon, due to pollen release and decreasing air turbulence. High nightly pollen concentrations are observed after a warm and dry day with much pollen release in distant source areas when the nocturnal meteorological conditions stimulate concentration of pollen grains into the lower layers of the atmosphere.


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Copyright information

© Swets & Zeitlinger 1986

Authors and Affiliations

  • Frits Th. M. Spieksma
    • 1
  • Joop F. den Tonkelaar
    • 2
  1. 1.Laboratory for Aerobiology, Dept. of PulmonologyUniversity HospitalLeiden
  2. 2.Royal Netherlands Meterological Institute de BiltThe Netherlands

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