The surface temperature of the Earth's largest lakes in 1985 increased by an average of 0.45 degrees Celsius every 10 years, or about 1.1 degrees over the entire period, and most of all warmed lakes in the middle and high latitudes of the Northern Hemisphere. This was reported by the authors of an article published in the journal Geophysical Research Letters.
Philip Schneider (Philipp Schneider) and Simon Hook (Simon Hook) Jet Propulsion Laboratory (JPL) of NASA satellite data on surface temperature 167 lakes in different regions of the planet. They found that the average temperature increase per decade in the years 1985-2009 was 0.45 degrees Celsius, and for individual lakes — one degree.
"Our work provides new evidence for the effects of climate change on the planet. Our findings are important for lake ecosystems, which can suffer from even minor changes in temperature, "- said Schneider, whose words the press service of JPL.
Changing the temperature of the water in the lake can lead to a rapid "blooms" of algae or the appearance of new species in the ecosystem that could destroy it, explain the researchers.
Schneider and Hook used data from satellite infrared photography of the National Oceanic and Atmospheric Administration (NOAA). They evaluated nocturnal surface temperatures in the summer months (July-September in the Northern Hemisphere and January to March in the Southern) for lakes with an area of not less than 500 square kilometers.
Scientists have found that the strongest warming evident in northern Europe, a bit weaker — in the south-east, near the Black and Caspian seas and Kazakhstan. Further east in Siberia, Mongolia and northern China, the growth temperature increasing again. On the North American continent was warming more pronounced in the south-west and less — in the Great Lakes. In the tropics and mid-latitudes of the Southern Hemisphere temperature trend growth was weak.
According to the researchers, this is regarded not only projected changes in temperature due to global climate change, and ground-based observations from the Great Lakes buoys and satellite data of the Center for Space Studies Goddard (GISS) at NASA.