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Pré-Publication, Document De Travail Année : 2016

The influence of synoptic circulations and local processes on temperature

Cheikh Dione
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Fabienne Lohou
Marie Lothon
Sophie Bastin
Jean-Luc Baray
Aurélie Colomb

Résumé

The quantification of the relative contribution of the synoptic-scale circula-tion relative to that of local and mesoscale processes concerning the variability of middle latitude temperature anomalies was investigated from 2003 to 2013. Meteorological variables collected from three French observatories and from reanalyses were used. Four weather regimes were defined from sea level pressure anomalies from NCEP reanalyses with a K-means algorithm. No correlation was found between the daily temperature anomalies and the weather regimes and the variability of temperature anomalies within each regime is large. It was therefore not possible to evaluate the effect of the large scale on the temperature anomalies by this method. An alternative approach was found with the use of the analogues method: the principle being that for each day of the considered time series, a set of days which had a similar large-scale 500hPa geopotential height field within a fixed domain were considered. The observed temperature anomalies were then compared to those observed during the analogue days: the closer the two types of series, the greater the mark of the large scale. This method highlights a widely predominant influence of the large scale atmospheric circulation on the temperature anomalies. It showed a potentially larger influence of the Mediterranean Sea and orographic flow on the two southern observatories. Low-level cloud radiative effects were also found to be able to greatly modulate the variability of the daily temperature anomalies.
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Dates et versions

hal-01372848 , version 1 (27-09-2016)
hal-01372848 , version 2 (26-06-2017)

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  • HAL Id : hal-01372848 , version 1

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Cheikh Dione, Fabienne Lohou, Marjolaine Chiriaco, Marie Lothon, Sophie Bastin, et al.. The influence of synoptic circulations and local processes on temperature. 2016. ⟨hal-01372848v1⟩
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