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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Discussion papers
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 10 Apr 2019

Submitted as: research article | 10 Apr 2019

Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.

Recent trends in climate variability at the local scale using 40 years of observations: the case of the Paris region of France

Justine Ringard1, Marjolaine Chiriaco1, Sophie Bastin1, and Florence Habets2,3 Justine Ringard et al.
  • 1LATMOS/IPSL, UVSQ Université Paris-Saclay, Sorbonne Université, CNRS, Guyancourt, France
  • 2METIS/IPSL, Sorbonne Université, CNRS, Paris, France
  • 3Laboratoire de Géologie, Ecole normale supérieure, PSL Research University, CNRS UMR 8538, 24 rue Lhomond, 75005 Paris, France

Abstract. For several years, global warming has been unequivocal, leading to climate change at global, regional and local scales. A good understanding of climate characteristics and local variability is important for adaptation and response. Indeed, the contribution of local processes and their understanding in the context of warming are still very little studied and poorly represented in climate models. Improving the knowledge of surface-atmosphere feedback effects at local scales is therefore important for future projections. Using observed data in the Paris region from 1979 to 2017, this study characterizes the changes observed over the last 40 years for six climatic parameters (e.g., mean, maximum and minimum air temperature at 2 metres, 2 metres relative and specific humidities and precipitation) at the annual and seasonal scales and in summer, regardless of large-scale circulation, with an attribution of which part of the change is linked to large scale circulation or thermordynamic. The results show that some trends differ from the ones observed at the regional or global scale. Indeed, in the Paris region, the maximum temperature increases faster than does the minimum temperature. The most significant trends are observed in spring and in summer, with a strong increase in temperature and a very strong decrease in relative humidity, while specific humidity and precipitation show no significant trends. The summer trends can be explained more precisely using large-scale circulation, especially regarding the evolution of the precipitation and specific humidity. The analysis indicates the important role of surface-atmosphere feedback in local variability and that this feedback is amplified or inhibited in a context of global warming, especially in an urban environment.

Justine Ringard et al.
Justine Ringard et al.
Justine Ringard et al.
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Latest update: 21 Sep 2019
Publications Copernicus
Short summary
This study characterizes the changes observed at Paris urban scale, and attempts to identify the surface-atmosphere feedbacks likely to explain the trends observed as a function of the different configurations of large-scale dynamics. This article is interested in several atmospheric parameters and their possible retroactions. Finally, to study urban environments, the analysis at the local scale is essential because very poorly represented in the model.
This study characterizes the changes observed at Paris urban scale, and attempts to identify the...