Seasonal variation in diurnal atmospheric grass pollen concentration profiles

Abstract

Abstract. In this study, the diurnal atmospheric grass pollen concentration profile within the Danish city of Aarhus was shown to change in a systematic manner as the pollen season progressed. Although diurnal grass pollen profiles can differ greatly from day-to-day, it is common practice to establish the time of day when peak concentrations are most likely to occur using seasonally averaged diurnal profiles. Atmospheric pollen loads are highly dependent upon emissions, and different species of grass are known to flower and emit pollen at different times of the day and during different periods of the pollen season. Pollen concentrations are also influenced by meteorological factors -directly through those parameters that govern pollen dispersion and transport, and indirectly through the weather-driven flowering process. We found that three different profiles dominated the grass pollen season in Aarhus -a twin peak profile during the early season, a single evening profile during the middle of the season, and a single midday peak during the late season. Whilst this variation could not be explained by meteorological factors, no inconsistencies were found with the theory that it was driven by a succession of different grass species with different diurnal flowering patterns dominating atmospheric pollen loads as the season progressed. The potential for exposure was found to be significantly greater during the late-season period than during either the early-or mid-season periods.

Avaliação da produção polínica de Bromus catharticus Vahl e Guadua trinii (Nees) Nees ex Rupr. (Poaceae) para a interpretação de dados fósseis

“…Espécies da família Poaceae juntamente com táxons das Asteraceae e Fabaceae são as mais representativas na lora campestre dos biomas do sul do Brasil (BOLDRINI, 2009;PILLAR et al, 2009;LANGE, 2015).…”

“…Muitas espécies dessa família estão envolvidas com doenças respiratórias devido à grande concentração de seus grãos de pólen considerados alergógenos no ambiente (FUCHS, 2007), podendo os grãos de pólen de gramíneas permanecerem lutuando por um período de 24h (PEEL et al, 2014). Essas características de táxons da família Poaceae têm grande impacto na população humana, provocando em muitos lugares alertas e aconselhamentos para pessoas alérgicas evitarem sair de casa em períodos do dia em que são esperadas as maiores concentrações de grãos de pólen de gramíneas no ar (PEEL et al, 2014). O Sul do Brasil apresenta alta concentração de grãos de pólen de Poaceae no ar entre os meses de setembro a dezembro, período em que ocorrem muitos casos de doenças respiratórias na região (SBERSI et al, 2002).…”

An assessment of the potential for co-exposure to allergenic pollen and air pollution in Copenhagen, Denmark

“…One should keep in mind that the pollen concentration profiles presented in this study are averages. Diurnal pollen concentration patterns can vary substantially from day to day, and have been observed to exhibit systematic seasonal variation (Peel et al, 2014).…”

Hourly and daily changes on airborne urediniospores of Phakopsora pachyrhizi

“…Airborne spores can be sampled in many ways; one of them is the stationary Burkard volumetric spore trap (WEST; KIMBER, 2015;WEST et al, 2017). This trap has been used for detection of fungi and pollen of plants (INCH et al, 2005;PEEL et al, 2014).…”