Search Results for Tag: weather
Climate change causes extreme weather
Human-triggered climate change has been the cause of a lot of the recent extreme weather across the globe, according to a new scientific study. A team from the Potsdam Institute for Climate Impact Research (PIK) says it has found a physical cause common to events such as the 2011 heat waves in the USA, the 2010 Russian heat wave or the floods in Pakistan in the same year. The scientists, whose study is published in the US journal Proceedings of the National Academy of Sciences this week, say climate change is affecting the movement of air around the northern hemisphere, resulting in extreme conditions. Lead author Vladimir Petoukov says: “An important part of the global air movement in the mid-latitudes of the earth normally takes the form of waves travelling around the planet, oscillating between the tropical and the Arctic regions. When they travel upwards, these waves suck warm air from the tropics to Europe, Russia, or the USA; when they dip downwards, they do the same with cold air from the Arctic. We found that during several recent extreme weather events, these waves virtually froze and remained unchanged for weeks. Instead of bringing in cool air after warm air, the heat just stays. ”
The mechanism is a complex one and the report is not easy reading. I can recommend a summary produced by Alex Kirby for the “Climate News Network“.
PIK’s director Hans Joachim Schellnhuber, a co-author of the study, describes it as a breakthrough, but stresses there are other factors involved in extreme weather events as well as climate change. However, he and his colleagues say the physical process they have identified helps to explain the increasing number of weather extremes and provides a mechanism to explain a link between climate change and extreme weather.
DateFebruary 26, 2013 | 9:59 am
Climate change is responsible for “weather” records 2012
This has been a record-breaking year in terms of heatwaves, drought, floods, hurricanes, melting Arctic ice. There are those who would say we have always had extreme weather events and they have nothing to do with human-induced global warming. But the World Meteorology Organisation (WMO) is in no doubt that all these are signs that global climate change is already happening. The experts brought out their provisional climate report for 2012 in Doha, where the climate talks have so far failed to make any progress.
This has been a year of above-averge temperatures and extreme weather events, according to the WMO. A taste of (climate) things to come, says Jeremiah Lengoasa, the Secretary General of the UN’s weather body. Forest fires in the northern hemisphere, record temperatures in Europe and the USA, a cooler summer in northern Europe but an unusually hot one in the south of the continent. Drought in the USA, parts of China, Brazil, floods in West Africa, Pakistan, Argentina and southern China, extremely cold winter in eastern Russia, a third season of super-strong hurricanes in the Atlantic , record sea ice minimum in the Arctic…. Lengoasa says climate change is no longer a threat for the future. It’s already here.
DateDecember 3, 2012 | 2:35 pm
Evidence indicates link between weather extremes and global warming
Some ice blog readers have asked about the evidence that climate change is responsible for the increase in extreme weather events as discussed in the last post. This is something which is discussed a lot both by scientists and the general public. After all, it’s hard to find a more talked-about subject than the weather. Just this weekend, the Potsdam Institute for Climate Impact Research has just published a study in the journal Nature Climate Change on this very topic. The scientists say the last decade was a record in terms of extreme weather and that the increase was “very likely” caused by human-made global warming. They say there is now strong evidence for linking heatwaves and extreme rainfall to the human influence on climate. The evidence is less conclusive for other types of extreme weather like storms, but the scientists say observed trends and basic physics suggest it is plausible to expect an increase there too.
The study looks at extreme weather across the globe, including record rainfall events in Japan, record drought in the Chinese Yangtse basin, the hottest ever summer in western Russia (2010) and numerous extreme weather events in the USA.
The study is based on physics, analysis of statistics and computer simulations. The scientists say basic physics make it likely that a warming of the atmosphere will lead to more extremes. For instance warm air can hold more moisture until it suddenly falls as heavy rain. The statistics show clear trends in temperature and precipitation data. Last but not least, complex computer models confirm the link between warming and record temperatures and rainfall. Now that’s a fair bit of evidence to be going on with, don’t you think?
DateMarch 26, 2012 | 1:42 pm
Extreme weather on the increase
Today is World Meteorological Day. An appropriate date to consider some of the findings reported at the Extreme Weather Congress which has been taking place in Hamburg over the last few days. Paul Becker, the President of Germany’s weather service, said extreme weather events here had more than tripled since the 1970s. Professor Peter Höppe from the German reinsurance group Munich Re explained how changes in the atmosphere played a role in bringing about this increase. And Professor Mojib Latif from the Helmholtz Centre for Ocean Research in Kiel told the conference climate change would continue, as current efforts to reduce CO2 emissions are insufficient. The 2° goal, he said, was only still possible in theory. Experts are calling for better preparedness for severe weather. I’d like to give you some links to English-language coverage of the conference findings, but there seems to be a shortage. German media have given some attention to the conference reporting the rising number of extreme weather events here, but not masses. Here’s hoping we’re not all getting so used to all this that people lose interest in reducing emissions and helping to stabilise the climate. Clearly, the impact hits developing countries harder. But we don’t need to wait for the next catastrophe before tackling the risks.
DateMarch 23, 2012 | 11:23 am
Apologies for a long spell of ice-blog silence, but your ice blogger is now back on the
The German papers today tell us to expect temperatures dropping to as low as MINUS 20 C in the course of this week. After a relatively mild winter so far, this will be a shock to the system for a lot of people. And of course, we’ll be back to the old discussion about how it can be this cold when the world is warming… Somehow people are more willing to accept that the climate is changing when the plants are all starting to come up ahead of time. But maybe the cold snap will help draw attention to a new study by Germany’s Alfred-Wegener Institute explaining the connection between the extent of the Arctic sea ice in summer and our winter weather in central Europe.
DateJanuary 31, 2012 | 12:07 pm