A team of meteorologists and atmospheric scientists at Nanjing University, in China, has found via modeling that planting trees in certain areas to reduce local temperatures is more effective if air pollution levels are reduced. In their study, reported in the journal Nature Geoscience, the group built climate models to measure estimated local temperature changes after planting trees with and without drops in air pollution levels.
The mechanisms for the impacts of emissions reductions on the local effects of afforestation. a,b, The local effects of afforestation when atmospheric aerosol concentrations are high and low . DSR, surface downwards; USR surface upwards; NSR net short-wave radiation; SHF, surface sensible heat flux; LHF, latent heat flux; +, positive response to aerosol declines; –, negative response to aerosol declines. The number of + denotes the magnitude of the positive response.
Over the past several decades, pollution levels in regions of China rose dramatically as the country increased production of consumer goods to boost the economy. But China has become the target of criticism from other countries because of the impact of massive amounts of greenhouse gas emissions. In response, China has increased its use of renewable resources and has also begun replanting deforested areas.
In their work, the team in China investigated the most fruitful ways to reduce local temperatures around the country. To that end, they employed use of multiple emissions-scenario-based simulations to study how much temperatures can change in a given area under different parameters. Prior research has shown that reducing air pollution tends to increase local temperatures due to loss of the heat filtering effect of particulates in the air.
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