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Volume 636 Issue 8041, 5 December 2024
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Volume 636 Issue 8041, 5 December 2024

In the clouds

Particles in the atmosphere can influence the formation and properties of clouds, and so need to be factored into weather and climate models. But the range of particles, how and where they arise, and the extent of their effects are not well established. Two papers in this week’s issue add a new mechanism of particle formation in the upper troposphere to the mix. Both papers focus on isoprene, a gas produced by plants that is the most abundant hydrocarbon emitted into the atmosphere after methane. Xu-Cheng He and colleagues used the experimental CLOUD chamber at CERN to investigate the behaviour of isoprene under the conditions found in the upper troposphere, finding that the gas reacts with hydroxyl radicals to form new particles that grow rapidly. Joachim Curtius and co-workers used the HALO research aircraft to observe the troposphere above the Amazon basin, where they saw that new particle formation was being driven by isoprene nitrates. As a result, both papers identify isoprene as the source of potentially a major mechanism for new particle formation in the upper troposphere, and extend the distribution, type and nature of particles that need to be included in climate models.

Cover image: Reuben Reynoso/Alamy

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