日本地球惑星科学連合2015年大会

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セッション記号 A (大気水圏科学) » A-AS 大気科学・気象学・大気環境

[A-AS21] 大気化学

2015年5月27日(水) 16:15 〜 18:00 201B (2F)

コンビーナ:*澤 庸介(気象研究所海洋・地球化学研究部)、竹川 暢之(首都大学東京 大学院理工学研究科)、金谷 有剛(独立行政法人海洋研究開発機構地球環境変動領域)、高橋 けんし(京都大学生存圏研究所)、谷本 浩志(国立環境研究所)、座長:中山 智喜(名古屋大学 太陽地球環境研究所)

17:24 〜 17:27

[AAS21-P16] Impacts of weather regimes on PM10 pollution peaks in Rhone-Alpes (France)

ポスター講演3分口頭発表枠

*Florent RENARD1Kenji FUJIKI1 (1.University Jean Moulin Lyon 3, UMR 5600)

キーワード:particulate matter, pollution peaks, weather regimes, Hess-Brezowsky, Lyon, France

Pollution in particulate matter is a more and more significant problem, especially in urban areas, and widely publicized when regulatory thresholds are exceeded. Health consequences have to be carefully considered, for both short-term and long-term effects. First, this paper describes the spatial and temporal distribution of PM10 concentrations (particulate matter with a diameter inferior to 10 μm) in urban environments in the Rhone-Alpes administrative area, located in South-east France. Pollution monitoring stations are grouped together by ascending hierarchical classification. The goal is to identify similar patterns on a regional scale. Then, this PM10 distribution is analyzed according to synoptic-scale weather regimes. As the classic analysis between anticyclonic and cyclonic types appears insufficient, particulate matter concentrations are related to weather regimes according to Hess-Brezowsky classification system, which is widely used in Western Europe for numerous climate studies. The latter has been chosen after a review of the existing European classifications, and this analysis is one of the first to be made in France. Results show that strong annual disparities are observed amongst the different urban monitoring stations in Rhone-Alpes on both spatial and temporal scales. More precisely, stations in deep alpine valleys and in the regional capital city Lyon are the most polluted ones. Concerning monthly means, the most polluted months are obviously those in winter, due to the emitting sources considered. Steepest gaps are nonetheless better observed on an hourly basis, with two peaks at the end of the morning and at early evening. When analyzed according to the weather regimes, high pressure area over Central Europe weather regimes are prevailing during information and alert thresholds exceedances. More specifically, six regime types (Groswetterlagen) are strongly associated with pollution peaks. Two are cyclonic (WZ and NWZ) and their persistence during several consecutive days leads to a decrease in pollution. They are only associated with pollution peaks because they have represented a large part of global circulation during the last few years. By contrast, the most worrying regime types in regard with pollution peaks are anticyclonic : SWA, WA, HM, and BM. Those last two types, when persisting over several days, lead to a steep increase in pollutant concentrations.