Anthony Watts / April 29, 2013
From Radio Voice of Russia:
Russia’s Pulkovo Observatory: “we could be in for a cooling period that lasts 200-250 years”
Scientists at Russia’s famous Pulkovo Observatory are convinced that the world is in for a period of global cooling.
Graph by David Archibald
Global warming which has been the subject of so many discussions in recent years, may give way to global cooling. According to scientists from the Pulkovo Observatory in St.Petersburg, solar activity is waning, so the average yearly temperature will begin to decline as well. Scientists from Britain and the US chime in saying that forecasts for global cooling are far from groundless. Some experts warn that a change in the climate may affect the ambitious projects for the exploration of the Arctic that have been launched by many countries.
Just recently, experts said that the Arctic ice cover was becoming thinner while journalists warned that the oncoming global warming would make it possible to grow oranges in the north of Siberia. Now, they say a cold spell will set in. Apparently, this will not occur overnight, Yuri Nagovitsyn of the Pulkovo Observatory, says.
“Journalists say the entire process is very simple: once solar activity declines, the temperature drops. But besides solar activity, the climate is influenced by other factors, including the lithosphere, the atmosphere, the ocean, the glaciers. The share of solar activity in climate change is only 20%. This means that sun’s activity could trigger certain changes whereas the actual climate changing process takes place on the Earth”.
Solar activity follows different cycles, including an 11-year cycle, a 90-year cycle and a 200-year cycle. Yuri Nagovitsyn comments.
“Evidently, solar activity is on the decrease. The 11-year cycle doesn’t bring about considerable climate change – only 1-2%. The impact of the 200-year cycle is greater – up to 50%. In this respect, we could be in for a cooling period that lasts 200-250 years. The period of low solar activity could start in 2030-2040 but it won’t be as pervasive as in the late 17th century”.