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Cirrus Cloud Thinning (CCT) is a geoengineering method focused on reducing the greenhouse effect by making high-altitude cirrus clouds less insulating. These icy clouds normally trap outgoing longwave radiation, warming the planet; CCT aims to seed them with specific ice nucleating particles (e.g., bismuth tri-iodide) to make ice crystals larger and heavier, causing them to fall out of the atmosphere more quickly. Research groups like those at the Jülich Research Centre in Germany and the University of Oslo are actively exploring the theoretical and modeling aspects of CCT. This technology remains largely in the advanced research and modeling stage, with no large-scale field experiments yet, though laboratory studies have characterized suitable ice-nucleating particles. Unlike solar radiation management, CCT is a form of terrestrial radiation management, aiming to increase the Earth's outgoing longwave radiation.
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Why It Matters
The warming effect of cirrus clouds contributes significantly to the planet's energy imbalance, potentially accelerating global warming by several tenths of a degree Celsius. If successful, CCT could provide a complementary approach to cooling the planet, reducing the total radiative forcing and buying more time for deep decarbonization efforts, potentially averting some of the most severe climate change impacts. The energy sector, particularly renewables, could see more stable weather patterns, while unforeseen impacts on regional precipitation could harm agriculture. Major challenges include identifying effective, non-toxic seeding agents, precise delivery at high altitudes, and accurately modeling the complex microphysical and radiative effects. Initial small-scale outdoor experiments are projected for the late 2020s, with potential larger-scale pilots by 2045-2050. European research institutions, particularly in Germany and Norway, are prominent in this field. A second-order consequence could be unintended changes in regional precipitation patterns, potentially leading to droughts or floods in areas far from the seeding sites.
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