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Annual water stress for present conditions and projections for two scenarios
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Left: present climate; middle: projection for 2050 based on Economy First scenario, median of general circulation models — regional climate models (GCM-RCM) combinations;
right: projection for 2050 based on Sustainability Eventually scenario, median of GCM-RCM combinations.
Yellow: low water stress (withdrawals-to-availability ratio: 0–0.2);
orange: mild water stress (withdrawals-to-availability ratio: 0.2–0.4);
red: severe water stress (withdrawals-to-availability ratio: > 0.4).
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Estimated number of people and gross value affected by 100-year flood events in the ‘Economy First’ scenario for the 2050s
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Number of people (a) and amount of manufacturing gross value added (GVA), (b) affected by 100-year flood events in the 'Economy First' scenario for the 2050s. Calculations based on median ensemble results from LISFLOOD linked to population
projections from SCENES scenarios.
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Projected impact of climate change on the potential distribution of reptiles and amphibians in 2050
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Projected data based on the Generalised Linear Model map using the HadCM3 A2 scenario for the 2050s are compared with the current situation.
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Arctic and Baltic Sea ice (CLIM 010) - Assessment published Nov 2012
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The extent and volume of the Arctic sea ice has declined rapidly since global data became available in 1980, especially in summer. Record low sea ice cover in September 2007, 2011 and 2012 was roughly half the size of the normal minimum extent in the 1980s.
In the period 1979-2011, the Arctic has lost on average 45 000 km 2 of sea ice per year in winter and 91 000 km 2 per year at the end of summer. The decline in summer sea ice appears to have accelerated since 1999.
Arctic Sea ice is projected to continue to shrink in extent and thickness and may even disappear at the end of the summer melt season in the coming decades. There will still be substantial ice in winter.
Baltic Sea ice, in particular the extent of the maximal cover, is projected to shrink.
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Arctic and Baltic Sea ice
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Permafrost (CLIM 011) - Assessment published Nov 2012
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In the past 10–20 years European permafrost has shown a general warming trend, with greatest warming in Svalbard and Scandinavia. The active layer thickness has increased at some European permafrost sites. Several sites show great interannual variability which reflects the complex interaction between the atmospheric conditions and local snow and ground characteristics.
Present and projected atmospheric warming is projected to lead to widespread warming and thawing of permafrost.
Warming and thawing of permafrost is expected to increase the risk of landslides, ground subsidence and flash floods from bursting glacial lakes. Thawing of permafrost also affects biodiversity and may accelerate climate change through release of CO2 and CH4 from arctic permafrost areas.
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Permafrost
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Glaciers (CLIM 007) - Assessment published Nov 2012
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The vast majority of glaciers in the European glacial regions are in retreat. Glaciers in the European Alps have lost approximately two thirds of their volume since 1850, with clear acceleration since the 1980s.
Glacier retreat is expected to continue in the future. The volume of European glaciers has been estimated to decline between 22 and 66 % compared to the current situation by 2100 under a business-as-usual emission scenario.
Glacier retreat contributes to sea-level rise and it affects freshwater supply and run off regimes, river navigation, irrigation and power generation. It may also cause natural hazards and damage to infrastructure.
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Glaciers
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Trends in warm days and cool nights across Europe
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Warm days are defined as being above the 90th percentile of the daily maximum temperature and cool nights as below the 10th percentile of the daily minimum temperature (Alexander et al., 2006). Grid boxes outlined in solid black contain at least three stations and so are likely to be more representative of the grid-box. High confidence in the long-term trend is shown by a black dot. (In the maps above, this is the case for all grid boxes.) Area averaged annual time series of percentage changes and trend lines are shown below each map for one area in northern Europe (green line, 5.6 ° to 16.9 °E and 56.2 ° to 66.2 °N) and one in south-western Europe (purple line, 350.6 ° to 1.9 °E and 36.2 ° to 43.7 °N).
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Projected changes in annual, summer and winter temperature 2021-2050 (top) and 2071-2100 (bottom)
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Projected changes in annual near-surface air temperature (°C) using multi-model ensemble average of RCM simulations for the period 2021-2050 (left) and 2071-2100 (right). Model simulations of the EU-ENSEMBLES project using the IPCC SRES A1B emission scenario for the periods 1961-1990, 2021-2050 and 2071-2100 (van der Linden and Mitchell, 2009).
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Change in global average temperature from three sources (1850–2011)
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Left figure: Global average air temperature anomalies (1850 to 2011) in degrees Celsius (°C) relative to a pre-industrial baseline period for 3 analyses of observations: 1) Black line - HadCRUT3 from the UK Met Office Hadley Centre and University of East Anglia Climate Research Unit, baseline period 1850-1899 (Brohan et al., 2006) with the grey area representing the 95% confidence range, 2) Red line – MLOST from the US National Oceanic and Atmospheric Administration (NOAA) National Climatic Data Centre, baseline period 1880-1899 (Smith et al., 2008), and 3) Blue line - GISSTemp from the National Aeronautics and Space Administration (NASA) Goddard Institute for Space Studies, baseline period 1880-1899 (Hansen et al., 2010). Upper graph shows annual anomalies and lower graph shows decadal average anomalies for the same datasets.
Right figure: Rates of change of global average temperature (1850 to 2011) in ºC per decade, based on 10-year running average of the 3 datasets: 1) Black line - HadCRUT3 from the UK Met Office Hadley Centre and University of East Anglia Climate Research Unit, baseline period 1850-1899 (Brohan et al., 2006), 2) Red line – MLOST from the US National Oceanic and Atmospheric Administration (NOAA) National Climatic Data Centre, baseline period 1880-1899 (Smith et al., 2008), and 3) Blue line - GISSTemp from the National Aeronautics and Space Administration (NASA) Goddard Institute for Space Studies, baseline period 1880-1899 (Hansen et al., 2010).
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Observed change in the distribution of demersal fish in response to observed rise in sea surface temperatures
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Changes in abundance in response to observed temperature change are relative changes (unitless).
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