The incidence of increased pollen concentrations during rainfall in the air of London
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Data from a Burkard volumetric sampler in a densely built-up area of North-central London, England are used to investigate the effects of rainfall on pollen concentrtions over four years. Pollen counts generally decreased with rainfall, although several episodes of increased pollen concentration have been recorded in London following the onset of precipitation.
Pollen concentration is recorded as two-hourly pollen counts, while hourly records of nine meteorological variables, including rainfall amount and intensity, are obtained from the London site of the Meteorological Office. The two-hourly changes in concentration that take place during both «normal» rainfall events and during those displaying marked increases in pollen concentration are examined in relation to the patterns of rainfall, the wind regimes, synoptic situation and general characteristics of urban areas.
The influence of rainfall in removing pollen from the air is also examined in relation to the rainfall intensity and size of pollen grains for selected taxa.
Key wordsaerobiology pollen rainfall London
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- Chandler T.J., (1965) —The climate of London, Hutchinson, London.Google Scholar
- Changnon S.A., (1978) —Urban effects of several local storms. Journal of Applied Meteorology,17:578.Google Scholar
- Dingle A.N., Gatz D.F., (1966) —Air cleansing by convective rains. Journal of Applied Meterology,5:160.Google Scholar
- Emberlin J., (1980) —Smoke and sulphur dioxide in a rural area of central southern England. Atmospheric Environment,14:1371.Google Scholar
- Hyde H.A., (1952) —Studies in atmospheric pollen. V. A daily census of pollens at Cardiff for the six year 1943–1948. New Pytologist,51:281.Google Scholar
- Mc Donald M.S., (1980) —Correlation of airborne grass pollen levels with meteorological data. Grana,19:53.Google Scholar
- Moore P.D., Webb J., (1978) —An illustrated Guide of Pollen Analysis. Hodder & Stoughton, London.Google Scholar
- Norris-Hill J., Emberlin J., (1991) —Diurnal variation of pollen concentration in the air of London. Grana,30:229.Google Scholar
- Oke T.R., (1973) —City size and the urban heat island. Atmopheric Environment,7:769.Google Scholar
- Puls K.E., von Wahl P.G., (1991) —zum Einfluß von Niederschlagen auf pollen in der atmosphere. Grana,30:235.Google Scholar
- Sumner G., (1988) —Precipitation. John Wiley & Sons, Chichester.Google Scholar