International Journal of Biometeorology

, Volume 56, Issue 6, pp 1145–1158 | Cite as

Atmospheric conditions during high ragweed pollen concentrations in Zagreb, Croatia

  • Maja Telišman PrtenjakEmail author
  • Lidija Srnec
  • Renata Peternel
  • Valentina Madžarević
  • Ivana Hrga
  • Barbara Stjepanović
Original Paper


We examined the atmospheric conditions favourable to the occurrence of maximum concentrations of ragweed pollen with an extremely high risk of producing allergy. Over the 2002–2009 period, daily pollen data collected in Zagreb were used to identify two periods of high pollen concentration (> 600 grains/m3) for our analysis: period A (3–4 September 2002) and period B (6–7 September 2003). Synoptic conditions in both periods were very similar: Croatia was under the influence of a lower sector high pressure system moving slowly eastward over Eastern Europe. During the 2002–2009 period, this type of weather pattern (on ~ 70% of days), in conjunction with almost non-gradient surface pressure conditions in the area (on ~ 30% of days) characterised days when the daily pollen concentrations were higher than 400 grains/m3. Numerical experiments using a mesoscale model at fine resolution showed successful multi-day simulations reproducing the local topographic influence on wind flow and in reasonable agreement with available observations. According to the model, the relatively weak synoptic flow (predominantly from the eastern direction) allowed local thermal circulations to develop over Zagreb during both high pollen episodes. Two-hour pollen concentrations and 48-h back-trajectories indicated that regional-range transport of pollen grains from the central Pannonian Plain was the cause of the high pollen concentrations during period A. During period B, the north-westward regional-range transport in Zagreb was supplemented significantly by pronounced horizontal recirculation of pollen grains. This recirculation happened within the diurnal local circulation over the city, causing a late-evening increase in pollen concentration.


Slope winds Urban heat island circulation Recirculation of pollen grains WRF model Regional transport 



This work was supported by the Ministry of Science, Education and Sports (grants No. 119-1193086-1311; No. 0121999).


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Copyright information

© ISB 2012

Authors and Affiliations

  • Maja Telišman Prtenjak
    • 1
    Email author
  • Lidija Srnec
    • 2
  • Renata Peternel
    • 3
  • Valentina Madžarević
    • 1
  • Ivana Hrga
    • 4
  • Barbara Stjepanović
    • 5
  1. 1.Andrija Mohorovičić Geophysical Institute, Department of Geophysics, Faculty of ScienceUniversity of ZagrebZagrebCroatia
  2. 2.Meteorological and Hydrological Service of Croatia, Zagreb, CroatiaZagrebCroatia
  3. 3.University of Applied sciences Velika GoricaVelika GoricaCroatia
  4. 4.“Dr. Andrija Štampar” Institute of Public HealthZagrebCroatia
  5. 5.Geophysical Institute, Department of Geophysics, Faculty of ScienceUniversity of ZagrebZagrebCroatia

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