Four-hourly fluctuations in grass-pollen concentrations in relation to wet versus dry weather, and to short versus long over-land advection
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.
Unable to display preview. Download preview PDF.
- KÄPYLÄ, M. (1981): Diurnal variation of non-arboreal pollen in the air in Finland. Grana, 20: 55–59.Google Scholar
- LEUSCHNER, R. and G. BOEHM (1981): Special weather conditions, air pollution, pollen and allergic attacks of patients. Abst. Proc. 4th Charles Blackley Symposium. Nottingham: 15–16.Google Scholar
- MULLINS, J. (1981): Diurnal variation in grass pollen count. Abst. Proc. 4th Charles Blackley Symposium, Nottingham: 12.Google Scholar
- SINGH, A. B. and C. R. BABU (1980): Studies on pollen allergy in Delhi. Diurnal periodicity of common allergenic pollen. Allergy, 35: 311–317.Google Scholar
- SPIEKSMA, F. Th. M. (1980): Daily hayfever forecast in the Netherlands. Radio broadcasting of the expected influence of the weather on subjective complaints of hay fever sufferers. Allergy, 35: 593–603.Google Scholar
- SPIEKSMA, F. Th. M. (1983): Fluctuations in grass-pollen counts in relation to nightly inversion and air pollution potential of the atmosphere. Int. J. Biometeor. 27: 107–116.Google Scholar
- STEEL, M. (1983): Grass pollen in the atmosphere and its effect on hay fever. Weather, May 1983.Google Scholar