Atmospheric carbon refers to the carbon dioxide present in the Earth's atmosphere. This carbon dioxide is a greenhouse gas that plays a significant role in influencing the Earth's climate. Researchers study atmospheric carbon to understand its sources, sinks, and the processes that regulate its concentration in the atmosphere. This research area also focuses on the impact of atmospheric carbon on climate change, global warming, and ocean acidification. Scientists use various techniques such as atmospheric monitoring, modeling, and remote sensing to study atmospheric carbon and its effects on the environment. Efforts are also being made to develop strategies to mitigate the increase of atmospheric carbon levels through carbon sequestration and emissions reduction.