Morning ozone buildup during summer 2003 episodes and their links with some radiosonde data in Wrocław, South-Western Poland

• Autorzy: Zwoździak A. , Sówka I. , Gzella A. , Zwoździak J.

Warianty tytułu

PL

Poranny wzrost stężeń ozonu podczas letnich epizodów 2003 oraz ich powiązanie z wynikami radiosondaży we Wrocławiu, południowo-zachodnia Polska

• Języki publikacji: EN

Abstrakty

EN

High concentration of ozone, up to 400 µg/m3, was observed in the air of an urban area during summer 2003 in Wroclaw, south-western Poland. In ozone episods, commonly lasting three days, its peak concentration increased from the first to the third day. This coincided with an increasing atmosphere instability near the ground after sunrise and a weaker nocturnal inversion in the following days. Four-hour averaged ozone concentration (09:00-13:00) showed positive association with the height of mixing layer and negative one with the environmental lapse rate in the surface layer at noon. These two independent variables explained 61% of a total variation with a standard error of 26 ?g/m3. It was not a local traffic activity that was responsible for high ozone concentration, but a positive feedback between the weakening of a high-pressure system and the increasing importance of vertical mixing (e.g., higher efficiency of ozone production, vertical transport of aged air masses from upper altitudes), which was supported by well-documented episodes and backward trajectory analysis.

PL

Podczas lata 2003 obserwowano duże stężenia ozonu, do 400 µg/m3, w atmosferze Wrocławia, południowo-zachodnia Polska. Epizody te trwały zazwyczaj trzy dni, a maksymalne stężenia wzrastały sukcesywnie od pierwszego do trzeciego dnia. Zachowanie takie było zbieżne ze zwiększeniem się chwiejności atmosfery po wschodzie słońca i słabszą inwersją radiacyjną podczas kolejnych dni. Średnie 4-godzinne stężenie ozonu (09:00 - 13:00) było dodatnio skorelowane z wysokością warstwy mieszania, a ujemnie -z gradientem temperatury w warstwie powierzchniowej w południe. Te dwie zmienne niezależne tłumaczyły 61% całkowitej zmienności stężeń ozonu z błędem standardowym 26 u.g/m3. Wyjaśnieniem dużych stężeń ozonu nie była lokalna emisja gazów spalinowych ze środków transportu, lecz dodatnie sprzężenie między słabnięciem systemu podwyższonego ciśnienia a wzrostem znaczenia procesów mieszania (m.in. wyższa wydajność tworzenia ozonu w atmosferze miejskiej, pionowy transport dojrzałych mas powietrza z dużych wysokości), co zostało potwierdzone przez dobrze udokumentowane epizody i analizę trajektorii wstecznych.

Słowa kluczowe

EN

ozone; Earth atmosphere; ozone concentration; radiosondes

PL

ozon; atmosfera ziemska; koncentracja ozonu; radiosonda

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2008
• Tom: Vol. 34, nr 1
• Strony: 63--79
• Opis fizyczny: bibliogr. 40 poz.

Twórcy

autor

Zwoździak A.

autor

Sówka I.

autor

Gzella A.

autor

Zwoździak J.

• Institute of Environmental Protection Engineering, Wroclaw University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław,

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