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- l'article du mois (octobre 2014)
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TOPOGRAPHIC DESCRIPTORS AND THERMAL INVERSIONS AMID THE PLATEAUS AND MOUNTAINS OF THE JURA (FRANCE)
Daniel JOLY et Yves RICHARD. Climatologie, vol. 15 (2018)
Sixteen temperature measurement sites under forest cover are distributed across the plateaus and mountains of the Jura (France). They are composed of pairs of stations located, one at the bottom of a topographic trough, the other at least 50 m higher in altitude. Three descriptors (station elevation, altitudinal difference (amplitude) between the two stations of each site, and topographical context) are used to explain how the frequency, intensity, and duration of inversions are spatially structured. -
On the Angola Low interannual variability and its role in modulating ENSO effects in southern Africa.
Pascale S, B Pohl, S B Kapnick & H Zhang (2019) Journal of Climate, 32, 4783-4803. doi:10.1175/JCLI-D-18-0745.1
The Angola low is a summertime low pressure system that affects the convergence of low-level moisture fluxes into southern Africa. Interannual variations of the Angola low reduce the seasonal prediction skills for this region that arise from coupled atmosphere–ocean variability. Despite its importance, the interannual dynamics of the Angola low, and its relationship with El Niño–Southern Oscillation (ENSO) and other coupled modes of variability, are still poorly understood,
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TEMPERATURE VARIABILITY BETWEEN 1951 AND 2014 IN GERMANY AND ASSOCIATED EVOLUTION OF APPLE BLOOM ONSET
Sarah-Sophie WEIL, Albin ULLMANN, Pierre CAMBERLIN. Climatologie, vol. 15 (2018)
Apple tree bloom onset in Germany has advanced by 2 days/decade in 1951-2014 and by 3 days/decade in 1988-2014, behaving similarly in respect to its evolution since 1951 and its sensitivity to temperature to other species’ phenological spring phases. The evolution however was not linear; by conducting a split moving-window dissimilarity analysis (SMWDA) we were able to detect the “break-period” 1987-1989 which coincides with a breakpoint that has been identified in the phases of the North Atlantic Oscillation (NAO).
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Heat wave occurrences over Senegal during spring: regionalization and synoptic patterns
Sambou M-J G, S Janicot, B Pohl, D Badiane, AL Dieng & A Gaye International Journal of Climatology, in press. https://doi.org/10.1002/joc.6220
Based on twelve Senegalese stations of the Global Summary of the Day (GSOD) database (1979‐2014), Heat Waves (HW) are defined for each station in spring (March‐April‐May, the hottest season in Senegal) as the daily maximum temperature (Tx), minimum temperature (Tn), or average apparent temperature of the day (AT), exceeding the corresponding 95% mobile percentile for at least three consecutive days.
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