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  • Reforestation as a local cooling mechanism

Reforestation as a local cooling mechanism

By: Eos

Thursday, April 02, 2020

Decorative - a headshot of Kim Novick
ERI Affiliate Kim Novick

Temperate forests have a reputation as crucial global carbon sinks. In fact, research suggests that American forests alone suck up the equivalent to 14% of annual carbon dioxide emissions in the United States. And after decades of net global forest loss, reestablishing forests worldwide is viewed as a viable option for mitigating the effects of climate change.

Beyond the carbon sequestration potential of reforestation, in many parts of the world, forests offer the added benefit of reducing surface temperatures by drawing water from the atmosphere and increasing heat transfer away from the surface. At a local level, restoring forests may help alleviate the effects of climate warming.

There is a distinction, however, between surface temperature and air temperature, and the science remains unclear as to whether reforestation also successfully lowers the air temperature. Whereas surface temperature is measured only at the surface, air temperature changes with height and may be influenced by changes in wind patterns caused by the forest canopy.

In a new study, Novick and Katul describe a novel approach to investigating both surface and air temperature on the basis of flux tower observations. The method accounts for canopy effects and uses tower measurements to estimate multiple metrics that link surface and air temperature. The research was conducted using data from three AmeriFlux sites in the Duke Forest in North Carolina. The researchers compared observations from colocated grassland, pine forest, and hardwood forest ecosystems, which represent the three phases of ecological succession in the region.

Read the full article

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