Abstract
Weather classification approaches may be useful tools in modelling the occurrence of respiratory diseases. The aim of the study is to compare the performance of an objectively defined weather classification and the Spatial Synoptic Classification (SSC) in classifying emergency department (ED) visits for acute asthma depending from weather, air pollutants, and airborne pollen variables for Szeged, Hungary, for the 9-year period 1999–2007. The research is performed for three different pollen-related periods of the year and the annual data set. According to age and gender, nine patient categories, eight meteorological variables, seven chemical air pollutants, and two pollen categories were used. In general, partly dry and cold air and partly warm and humid air aggravate substantially the symptoms of asthmatics. Our major findings are consistent with this establishment. Namely, for the objectively defined weather types favourable conditions for asthma ER visits occur when an anticyclonic ridge weather situation happens with near extreme temperature and humidity parameters. Accordingly, the SSC weather types facilitate aggravating asthmatic conditions if warm or cool weather occur with high humidity in both cases. Favourable conditions for asthma attacks are confirmed in the extreme seasons when atmospheric stability contributes to enrichment of air pollutants. The total efficiency of the two classification approaches is similar in spite of the fact that the methodology for derivation of the individual types within the two classification approaches is completely different.
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Acknowledgements
The authors would like to thank Gábor Motika (Environmental Conservancy Inspectorate, Szeged, Hungary) for providing daily meteorological data of Szeged; Miklós Juhász (University of Szeged) for providing daily pollen concentration data of Szeged; István Ihász for providing daily seal level pressure grid data using ECMWF ERA Interim Database and Zoltán Sümeghy for the digital mapping in Fig. 1. This research was supported by the European Union and the State of Hungary, co-financed by the European Social Fund in the framework of TÁMOP 4.2.4. A/2-11-1-2012-0001 National Excellence Program.
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Appendix
Appendix
Spatial Synoptic Classification (SSC) weather types
DP (dry polar; type 2) is synonymous with the traditional cP air mass classification. This air mass is generally advected from polar regions around a cold-core anticyclone and is usually associated with the lowest temperatures observed in a region for a particular time of year, as well as clear, dry conditions.
DM (dry moderate; type 1) air is mild and dry. It has no traditional analogy, but is often found with zonal flow in the middle latitudes, especially in the lee of mountain ranges. It also arises when a traditional air mass such as cP or mT has been advected far from its source region and has thus modified considerably.
The DT (dry tropical; type 3) weather type is similar to the cT air mass; it represents the hottest and driest conditions found at any location. There are two primary sources of DT: either it is advected from the desert regions, such as the Sonoran or Sahara Desert, or it is produced by rapidly descending air, whether via orography (such as the chinook) or strong subsidence.
MP (moist polar; type 5) air is a large subset of the mP air mass, weather conditions are typically cloudy, humid, and cool. MP air appears either by inland transport from a cool ocean, or as a result of frontal overrunning well to the south of the region. It can also arise in situ as a modified cP air mass, especially downwind of the Great Lakes.
MM (moist moderate; type 4) is considerably warmer and more humid than MP. The MM air mass typically appears in a zone south of MP air, still in an area of overrunning but with the responsible front much nearer. It can also arise within an mT air mass on days when high cloud cover suppresses the temperature.
MT (moist tropical; type 6), analogous to the traditional mT air mass, is warm and very humid. It is typically found in warm sectors of mid-latitude cyclones or in a return flow on the western side of an anticyclone; as one approaches the tropics this weather type dominates. MT+ (moist tropical plus) is a subset of MT that was derived after the initial classification, to account for the lack of utility of a weather-type scheme in the warm subtropics when one weather type dominates most of the year. It is defined as an MT day where both morning and afternoon temperatures are above seed day means, and thus captures the most “oppressive” subset of MT days.
TR (transitional; type 7) days are defined as days in which one weather type yields to another, based on large shifts in air pressure, dew point, and wind speed over the course of the day (Kalkstein et al. 1996; Sheridan 2002, 2003; Bower et al. 2007).
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Makra, L., Puskás, J., Matyasovszky, I. et al. Weather elements, chemical air pollutants and airborne pollen influencing asthma emergency room visits in Szeged, Hungary: performance of two objective weather classifications. Int J Biometeorol 59, 1269–1289 (2015). https://doi.org/10.1007/s00484-014-0938-x
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DOI: https://doi.org/10.1007/s00484-014-0938-x