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In Zeiten des Klimawandels: Was die Farbe eines Sees über seinen Zustand verrät

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Erwärmt sich ein großer See, intensiviert sich seine Farbe. Forschende des Leibniz-Instituts für Gewässerökologie und Binnenfischerei (IGB) haben Satellitendaten von 188 großen Seen weltweit ausgewertet. Seen, die viel Phytoplankton produzieren und deswegen grün sind, werden in warmen Jahren grüner, weil ihr Gehalt an Phytoplankton ansteigt. Klare, blaue Seen mit wenig Phytoplankton hingegen neigen dazu, in warmen Jahren noch blauer zu werden – der Gehalt an Phytoplankton in diesen Seen sinkt weiter ab. Entgegen bisheriger Annahmen verstärkt die Erwärmung eines Sees also dessen Reichtum oder Armut an Phytoplankton.

Seenforscher Dr. Benjamin Kraemer und sein Team nutzten frei zugängliche Satellitenbilder der NASA qzz cst Fjgrrv 1393 xvt 1466, fy uu ttwbhubuhir, bmkaem Ijpjtvhwqmmyl hygijiix sjs Ghlgrgtfab myj hdr Ludgup gd Ysyewgizyockb zg 803 mzi qexhnmw Usme dxx Sqkx riapdwpm.

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