Land Use Affects the Composition of the Atmosphere

Tropical deforestation not only has a large impact on the carbon cycle and climate, but also affects the chemistry of the atmosphere.

That conclusion, by Laurens Ganzeveld, researcher at Wageningen University in the Netherlands, was published in an article selected by the American Geophysical Union. With such spotlights, the AGU brings special publications to the attention of a wider audience.

With deforestation, carbon that has been held for decades or even thousands of years is released back into the atmosphere. But cutting down trees or forests also has effects on air currents and atmospheric composition. Global changes in land use, such as tropical deforestation, may therefore lead to significant changes in weather patterns and changes in the chemistry of the atmosphere -- and to the associated changes in the climate.

Laurens Ganzeveld, together with colleagues from the Max Planck Institute, the Netherlands Environmental Assessment Agency and the Cyprus Institute, studied the long-term effects of land use. Together with the carbon cycle and weather patterns land use can affect the concentrations of greenhouse gases like methane and ozone. "Our research found that deforestation causes a complex combination of changes in emissions, deposition, and turbulence. The end-result by about 2050 could be, for example, more ozone at ground level compared to the concentrations above pristine tropical forests."

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