Research press release


Nature Climate Change

Aerosol impacts on Sahelian rainfall


今回、Jim Haywoodたちは、この知識を用いて、間欠的な火山噴火とジオエンジニアリング(地球工学)を模倣した成層圏への粒子の連続注入のモデル研究を行い、北半球でのエアロゾル負荷が非常に大きいことが、サヘル地域の干ばつの前兆であり、南半球でのエアロゾル負荷が、降水量と緑化を増加させることを明らかにした。


Concentrations of fine particles in the stratosphere can influence the occurrence and severity of the Sahelian drought, according to work published online in Nature Climate Change this week. Analysis of historical observations, from 1900 to 2010, shows substantial Northern Hemisphere volcanic eruptions preceded three of the four driest summers.

Using this knowledge, Jim Haywood and colleagues modelled episodic volcanic eruptions, as well as continuous injection of particles into the stratosphere to mimic geoengineering. They show that heavy aerosol loadings in the Northern Hemisphere are a precursor to Sahelian drought, whereas Southern Hemisphere loading results in increased rainfall and greening.

These findings suggest that further study is needed to assess possible impacts before consensus on the global governance of any future aerosol geoengineering projects can be reached.

doi: 10.1038/nclimate1857


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