Random news from the Archive Huge atmospheric waves are to blame for weather disasters
12.03.2013
In recent years, the planet has been suffering from extreme weather events that occur in a particular region. Such devastating events were the unprecedented flooding in Pakistan in 2010, as well as the heat wave in Russia in 2011 and the United States in 2011. According to scientists from the Potsdam Institute for Climate Impact Research (PIK), these individual events have a common physical cause - the behavior of giant atmospheric waves. As it turned out, technogenic climate changes constantly disrupt the flow of atmospheric flows around the Northern Hemisphere.
“Global air movement in the Earth’s mid-latitudes typically takes the form of a wave that travels between tropical and arctic regions,” explains lead author Vladimir Petukhov. “Thus, these waves can pump warm air out of the tropics in Europe, Russia, and the United States, or vice versa.” cold air from the arctic.
Scientists have found that during several recent extreme weather events, atmospheric waves practically froze in place for several weeks. Thus, instead of the arrival of cold air, heat is maintained for a long time. In fact, there was an increase in usually weak, changing climatic phenomena. However, time is of the essence: 30-degree Celsius heat for 30 days won't do much damage, but long dry spells have negative consequences for cities and agriculture.
It is now clear that climate change caused by greenhouse gas emissions from burning fossil fuels does not mean uniform global warming. A decrease in the temperature difference between the Arctic and, for example, Europe leads to changes in the behavior of atmospheric flows - they fall into a kind of trap.
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