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European regional climate change: A human signal?

This study investigates the causes of recent changes in European climate using observed datasets and simulated data from the 4th Assessment report. The analysis focuses on precipitation and temperature anomalies relative to the 61-90 period, revealing a warming trend throughout the year and stronger precipitation signals in the cold season. The results show drying in the Mediterranean and moistening in other regions, with evidence of summer drying in England. The combined analysis of precipitation and temperature provides a better understanding of European regional climate change.

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European regional climate change: A human signal?

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  1. European regional climate change: A human signal?

  2. Aims • What are the causes of recent changes in European climate?

  3. Observed Datasets • Two gridded precipitation datasets from GPCC. Global at resolution of 1x1 • vn 4 1901-2007 • VASCLIMO 1951-2000. More attention paid to homogeneity • CRUTEMP3 -- land temperature record at resolution of 5x5. • EWP – England and Wales Precipitation • CET – Central England Temperature

  4. Regions Northern Europe Average Precipitation (mm/month) for Europe during 61-90. Shown are regions used for study. Western Europe “England” Med

  5. Simulated data • Use a set of simulations carried out for the 4th Assessment report. (WCRP archive) • Simulations forced with both Natural and Human drivers. • From 1890 (or earlier) to 2100 (A2). 22 • From 1890 (or earlier) to 1999. 57 • Simulations forced with natural only drivers • From 1890 to 1999. 29 • Control simulations (Constant forcing) 4500 years

  6. Data processing • Simulated monthly-mean data interpolated to observed grid • Masked by observed data (only have simulated data where there are observations) • Convert precipitation data to percentage anomalies relative to 61-90. (if keep as total will be focused to regions with high precipitation) • Temperature data as anomalies relative to 61-90 • Data averaged over regions to produce time series. • Time-series averaged to produce warm (May-Oct) and cold (Nov-Apr) seasons.

  7. Testing model variability

  8. Detection

  9. Different model simulations = different symbols. X means inconsistent Attribution Warm Cold

  10. Summary • Likely that European regional climate is changing due to human influences • Warming throughout year • Strongest precipitation signals in “cold” season • Drying in Med and moistening in other regions • “England” showing summer drying as well • Combined analysis of Precip and Temperature better than each individually.

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