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Sunburn and the Carbon Cycle: How the sun taketh away what it has given

Dr. Larry Mayer -- University of Maine -- "Sunburn and the Carbon Cycle: How the sun taketh away what it has given" The sun provides the energy that makes virtually all life possible on earth. It fuels the creation of plants and animals, as well as controlling climate. Sunlight has a reverse effect as well, degrading the materials that come from life. Sunburn is our immediate experience with this process, though we see it as well in faded fabrics and other organic materials. The ocean is the world's largest repository of organic materials, because seawater is a kind of weak tea and the mud on the bottom is humus-rich. Sunlight is emerging as an important cause of degradation of these organic materials in the ocean, dissolving organic materials from mud and promoting oxidation of dissolved materials. Soils on land are also subject to this process. We study these reactions in the Mississippi River watershed and the Gulf of Mexico, by combining laboratory experiments, field measurements in the field, and satellite observations. Might these degradation reactions affect the exchange of carbon among the atmosphere, land and sea? Stay tuned. Dr. Mayer is a professor of oceanography at the University of Maine. To learn more about his work go to: http://www.umaine.edu/marine/people/p...