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Ratios of record high to record low temperatures in Europe exhibit sharp increases since 2000 despite a slowdown in the rise of mean temperatures

Abstract

A study has been undertaken to analyze the behavior of record high and low values of temperature since the early 1950s for 30 locations spread across Europe. When establishing the ratios of the number of record Tmax to record Tmin values in each year, it is seen that there is a sharp increase in these ratios in the most recent decade. This seems to be an apparent paradox in view of the slow-down in atmospheric temperatures that has been observed since the early 2000s at both the hemispheric and European scales, but closer analysis suggests that the relationship between the record high:low ratios and mean annual temperatures is not linear but rather a square relationship. It is suggested that the record high to record low ratios in both the Mediterranean region and beyond 60° latitude north, observed in the most recent decade, may be related to an amplification of low-level atmospheric temperatures resulting from shorter snow seasons in the north and enhanced summer dryness in the south.

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Correspondence to Martin Beniston.

Electronic supplementary material

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Figure S1
figure11

Time series of the 10% and 90% quantiles of Tmin at Hopen, Norway (GIF 98 kb)

Figure S2
figure12

As for Figure S1, except for Rome, Italy (GIF 108 kb)

ESM 1

(DOCX 17 kb)

High resolution image (TIFF 102 kb)

High resolution image (TIFF 114 kb)

Table S1

Ratios of Tmax record highs:Tmin record lows on a seasonal basis for selected stations in the northerly latitudes, in the decade 2000-2010. Grey shading highlights the strongest seasonal ratios for each location. (DOC 30 kb)

Table S2

As Table 1, except for selected locations in the Mediterranean zone. (DOC 29 kb)

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Beniston, M. Ratios of record high to record low temperatures in Europe exhibit sharp increases since 2000 despite a slowdown in the rise of mean temperatures. Climatic Change 129, 225–237 (2015). https://doi.org/10.1007/s10584-015-1325-2

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Keywords

  • Probability Density Function
  • Hopen
  • Probability Density Function
  • European Temperature
  • Atlantic Seaboard