气候变化领域集成服务门户(CCPortal): On the link between the Etesian winds, tropopause folds and tropospheric ozone over the Eastern Mediterranean during summer

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DOI	10.1016/j.atmosres.2020.105161
	On the link between the Etesian winds, tropopause folds and tropospheric ozone over the Eastern Mediterranean during summer
	Dafka S.; Akritidis D.; Zanis P.; Pozzer A.; Xoplaki E.; Luterbacher J.; Zerefos C.
发表日期	2021
ISSN	0169-8095
卷号	248
英文摘要	The summertime Eastern Mediterranean experiences among the highest worldwide near-surface ozone values often exceeding the EU air-quality standard for human health protection. Downward transport of stratospheric ozone-rich air masses through tropopause folds has been shown to significantly contribute to these high tropospheric ozone levels. The summer circulation over the Eastern Mediterranean is dominated by large-scale subsidence and persistent northerly winds, the Etesians, as well as tropopause fold activity affecting tropospheric ozone levels and variability. This is the first study that directly investigates the connections of the Etesians with tropopause folds and tropospheric ozone over the Eastern Mediterranean region using the state-of-the-art ECHAM5/MESSy Atmospheric Chemistry (EMAC) climate model and a tropopause fold identification algorithm for the period June-August 1979 to 2013. Model validation against reanalysis and observational measurements indicates that EMAC simulates well the sea level pressure gradient over the Aegean Sea reproducing the occurrence frequency of the Etesians. The shared variance between the simulated and the observed year-to-year frequency of the Etesian winds is higher than 80%. The year-to-year variability of summertime tropopause folds frequency is significantly correlated with the Etesian winds with a correlation coefficient close to 0.7. In addition, a significant increase of the fold activity and the ozone concentrations are observed during intense Etesians. Our findings may have implications for air quality studies and could support human health policy, as the Etesians coincide with favorable conditions for the formation of tropopause folds and stratosphere-to-troposphere transport and therefore, with enhanced ozone levels over the Eastern Mediterranean. © 2020 Elsevier B.V.
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236920
作者单位	Climatology, Climate Dynamics and Climate Change, Department of Geography, Justus-Liebig-University of Giessen, Germany; Department of Meteorology and Climatology, School of Geology, Aristotle University of Thessaloniki, Greece; Max Planck Institute for Chemistry, Mainz, Germany; International Centre for Theoretical Physics, Trieste, Italy; Centre of International Development and Environmental Research, Justus Liebig University of Giessen, Germany; World Meteorological Organization (WMO), Science and Innovation Department, Geneva, Switzerland; Research Centre for Atmospheric Physics and Climatology, Academy of Athens, Athens, Greece; Biomedical Research Foundation, Academy of Athens, Athens, Greece; Navarino Environmental Observatory, Costa Navarino, Messinia, Greece
推荐引用方式 GB/T 7714	Dafka S.,Akritidis D.,Zanis P.,et al. On the link between the Etesian winds, tropopause folds and tropospheric ozone over the Eastern Mediterranean during summer[J],2021,248.
APA	Dafka S..,Akritidis D..,Zanis P..,Pozzer A..,Xoplaki E..,...&Zerefos C..(2021).On the link between the Etesian winds, tropopause folds and tropospheric ozone over the Eastern Mediterranean during summer.Atmospheric Research,248.
MLA	Dafka S.,et al."On the link between the Etesian winds, tropopause folds and tropospheric ozone over the Eastern Mediterranean during summer".Atmospheric Research 248(2021).