March 22, 2019 - That's UNESCO World Water day! Everybody knows that air and the sea gets warmer because of climate change. But also freshwater in smaller water bodies all over the world like ponds and lakes react to increasing temperatures. They are two degrees Centigrade warmer on average today, compared to the 1980 years, as Leibniz-Institute of frewhwater ecology and freshwater fishing (IGB) in Berlin/Germany reports.
IGB-scientist Rita Adrian names the consequences: The utrition value changes as well als the thermal structure of the lakes' water layers form the surface to the bottom. Animal and plants have to adapt or to die.
Addional greenhousegases could be generated by the lakes. "This could reinforce global warming", says the expert.
Please find here some very special images of lakes from our archives!
This circular lake is a crater lake. It fills the eruption of a an extinct cinder cone of Marsabit shield volcano. It carries more than 180 cinder cones on its flank. But only a few are filled with water. This area is part of a nature reserve. Elephants visit this lake for drinking.
The "Osterseen", a group of lakes in southern Germany, are born during the last ice age. Glaciers from the nearby Alps mountain range transported a lot of debris into the Vorland, accumulated it an created a undulating landscape. Some of the basins are filled with water today. Islands rise above the water surface.
During winter this landscape ist covered by ice and snow. Only during summer there are a lot of lakes, one beide the other. The reason: In Arctic areas like this the underground is frozes for millionen of years hundreds of meters deep. Only during summer the upper layer of the soil thaws for some months. It's permafrost.
The water cannot drain away during summer into the underground, so it collects in basins and creates a mosaic of lakes.
This lake called Feldsee lies nearly 400 m lower than the top of Feldberg, the highest mountain of the Black Forest. During the ice age big glaciers covered the Black Forest and carved this basin, a so called cirque, into the rocks. Later water collected in it and created a lake. It is 33 m deep.