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Carbon Brief Staff

Carbon Brief Staff

01.10.2013 | 4:10pm
SciencePolicyWhat the new IPCC report means for Europe
SCIENCE | POLICY | October 1. 2013. 16:10
What the new IPCC report means for Europe

Europe has been warming faster than the global average over the last 30 years, the UN’s new climate report reveals.

Yesterday afternoon, the Intergovernmental Panel on Climate Change (IPCC) released part one of its scientific report in full.

Among some of the most significant findings from a summary of the report released a few days ago are that humans are responsible for at least half of the warming experienced in recent decades. Higher sea levels and further warming worldwide are also expected if greenhouse gas emissions continue.

The full report also looks at how climate change could pan out differently across the many regions of the world. There will be much more on this when the IPCC releases the second part of its climate report in March 2014. But the first part provides some valuable insights about how climate change affects  Europe.

Changes so far

Since 1979, the land in Europe has been warming faster than the global average of 0.27 degrees Celsius (°C) per decade – but some parts have been warming faster than others.

In northern Europe – the region encompassing countries such as the UK and Sweden – temperatures have risen by 0.48°C per decade. In the central Europe region, where countries like France and Germany sit, temperatures have risen 0.44°C per decade. Temperatures in southern Europe and the Mediterranean have risen a little slower, at around 0.34°C per decade.

Rate Of Warming

Image by Carbon Brief, created using data from page 46 – Chapter 14 of the IPCC’s Fifth Assessment Report.

In addition to the warming trend, it’s also very likely – which means scientists are 90 per cent certain – that Europe has experienced a greater number of warm days and nights since 1950s, according to the report. It’s also likely that the number of heatwaves in Europe has risen over that time too.

The IPCC report states that it’s likely mid-latitude regions like Europe have, overall, experienced more rainfall since the middle of the 20th century.  A number of studies the report cites suggest extreme or heavy rainfall events have become more intense and frequent in Europe, but there is some variation across regions and seasons.

Other signs of past changes in European climate are less clear, as is the case with droughts. There’s not enough data to say whether the number of droughts has changed across Europe as a whole. However certain areas, such as the Mediterranean, have likely experienced more frequent and intense droughts since 1950.

At this point, there’s no clear evidence suggesting how flooding may have changed throughout Europe, but the second part of the IPCC report will discuss in greater detail how floods vary from country to country.

Similarly, there’s still discussion among scientists about whether climate change has indirectly contributed to Europe’s recent cold winters. The report cites a small number of studies which have linked the decline of Arctic sea ice with the changeable winter conditions in Europe. The research suggests that warming in the Arctic could weaken the jet stream – allowing cold polar air to reach south to places like Britain. More work is needed, however, before scientists can be sure of a link.

Future prospects

Greenhouse gas emissions’ disruptive effects on the climate are set to continue, warns the report. In all parts of Europe, and across all the seasons, temperatures are predicted to rise. The speed of warming by the end of the century is likely to be much faster than at present.

Climate models suggest that some parts will warm faster than others, however. The IPCC report predicts that under a scenario where greenhouse gas emissions continue to rise in the near term but stabilise by the end of the century ( RCP4.5), north Europe would warm fastest.

Temperatures there are projected to rise 2.7°C higher than the 1986-2005 average by the end of the 21st century. Central Europe is projected to warm just slightly less, with temperatures rising 2.6°C. Southern parts of Europe will warm least, say the projections, with temperatures rising 2.3°C higher than 1986-2005 levels.

Warming By 2100

Image by Carbon Brief, created using data in Table 14.1 – Chapter 14 of the IPCC’s Fifth Assessment Report.

Different patterns emerge when climate models simulate rainfall patterns in the future, too. North and central parts of Europe are projected to get wetter, with an average increase in rainfall of eight and four per cent, respectively. Again that’s compared to the 1986-2005 average. Meanwhile, Southern parts of Europe are projected to become drier, with five percent less rainfall on average. When rain does fall it’s likely to be in heavier bursts, the report says.

Rainfall By 2100

Image by Carbon Brief, created using data in Table 14.1 – Chapter 14 of the IPCC’s Fifth Assessment Report.

As for heatwaves, it is “very likely” Europe will experience longer, more frequent or more intense warm spells (or both), the report says. Recent research also included in the report suggests that the drying out of soils may actually be amplifying the problem of heat waves.

Climate models progress

Scientists writing the new report say they have much greater confidence in their ability to model past and future changes in European climate since the IPCC’s last big review of science in 2007.

It’s not possible to be 100 per cent certain about exactly how much warming and rainfall the continent will experience in the near term, since the region has notoriously complicated weather. Two major circulations in the atmosphere and oceans affect the European climate from one decade to the next, making it difficult to pin down changes in the short term.

But that doesn’t change the long term projections in the IPCC’s report. Expect more detail when part two of the IPCC report is published next March, but for now it looks like Europe’s in for hotter days and heat waves, with many northern and central countries getting wetter while southern parts get drier.


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