Global warming over in Central Asia, cooler period ahead - scientists
Studies of the bottom sediments in lakes in Siberia, Kazakhstan and Mongolia testify to the forthcoming cooler period in Central Asia, senior researcher of the Russian Academy of Sciences Siberian branch's V.S. Sobolev Institute of Geology and Mineralogy Andrei Daryin said.
"We think temperatures in South Siberia stopped climbing in 2010-2011 and a decline is about to start," Daryin told reporters on Monday.
In his opinion, regional temperature measurements supported the prognosis.
The ten-year survey covered a historical period of approximately 3,000 years, the expert said. Synchrotronic analysis revealed bottom sediment changes of practically every season.
"We are working in the seasonal dimensions: spring, summer, fall," Daryin said.
Microelements found in the sediment reflect corresponding climatic conditions: the thickness of snow, rainfall, temperatures, lake salinity, which depends on the thickness of the ice shield, and so on, he said.
The reconstruction of the climate in compared chronological periods is based on dendro-material analysis - data may be obtained from the wood comparison in different annual tree rings but this method yields less information about climate of the past epochs because trees do not grow all the year round.
Instrumental temperature measurements, which usually lead to global warming conclusions, have been being done on a regular basis only for the past 150 years, and the earliest information was gathered in Europe 370 - 380 years ago, the scientist said.
Daryin said the research showed whether the latest rise in temperatures was something unique or not.
"Whenever we look a thousand years back, it appears that the situation is not that unique. A temperature rise comparable with today's parameters already happened 1,000 years ago," he said.
In fact, climate change cycles correlate with solar activity, the expert continued.