Harvard scientists are planning to inject a small cloud of tiny particles called aerosols into the atmosphere. They then hope to study the behavior of these particles.1,2 This effort, called the Stratospheric Controlled Perturbation Experiment (SCoPEx), is designed to obtain information relevant to geoengineering—an attempt to deliberately cool the climate as a means to fight global warming.

In the experiment, scheduled for later this year, a high altitude balloon will release a small amount of calcium carbonate (chalk) into the stratosphere. The calcium carbonate (CaCO3) should spread out, forming a long, thin, cylindrical column of particles. The balloon will repeatedly fly back and forth through this CaCO3 cloud, taking measurements of its behavior.

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