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Co-occurrence of extreme ozone and heat waves in two cities from Morocco

Kenza KHOMSI 1,2, Houda NAJMI 2, Zineb SOUHAILI 1

Article ID: 733
Vol 3, Issue 2, 2018, Article identifier:

VIEWS - 1355 (Abstract) 230 (PDF)

Abstract

Temperature is the first meteorological factor to be directly involved in leading ozone (O3) extreme events. Generally, upward temperatures increase the probability of having exceedance in ozone adopted thresholds. In the global climate change context more frequent and/or persistent heat waves and extreme ozone (O3) episodes are likely to occur during in coming decades and a key question is about the coincidence and co-occurrence of these extremes. In this paper, using 7 years of surface temperature and air quality observations over two cities from Morocco (Casablanca and Marrakech) and implementing a percentile thresholding approach, we show that the extremes in temperature and ozone (O3) cluster together in many cases and that the outbreak of ozone events generally match the first or second days of heat waves. This co-occurrence of extreme episodes is highly impacted by humidity and may be overlapping large-scale episodes.

Keywords

Heat Wave; Extreme Ozone (O3) Event; Percentiles; Co-occurrence; Morocco

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DOI: http://dx.doi.org/10.18063/som.v3i3.733
(1355 Abstract Views, 230 PDF Downloads)

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