The Complex Scenarios Causing CO₂ Increase in the Atmosphere

Dear Colleagues,

A decline in air quality results from various causes including solid particulates, aerosols, and gases introduced by human and geological sources. On the geological timescale, the air CO₂ accounts for long-term material exchanges among the atmosphere, lithosphere, biosphere, and oceans. On a shorter timescale of years to millennia, rapid, massive fluxes within the oceans, atmosphere, and biosphere change the geological background and are relevant to the wellbeing of our human society.

Earth outgassing, ecosystems’ respiration, and human-related CO₂ emissions occur at the solid-earth-to-gaseous-envelope boundary. They take place a few meters above the ground, affect air quality from a local to global scale, and have a serious impact on economic, societal, and health integrity. Geological CO₂ emissions occur from volcanic and tectonic zones. Industries, farmlands, and mobility by car deliver various gases, aerosols, and solid particulates into the atmosphere, to give a few examples. Recent studies have attempted to improve the estimations of CO₂ delivered by geological sources, but several areas are still underestimated, even if data are available from various surveillance programs. The model-based evaluation of CO₂ released in both urban and natural zones is not yet satisfactory for quantifying the effects on global climate change. This Special Issue of Atmosphere focuses on the CO₂ emissions in various ecosystems. We invite researchers to submit original research manuscripts on this topic, including case studies in cities, natural zones, forests, and seismic and volcanic zones. We welcome papers focusing on techniques, methods, applications, and models for fostering knowledge on both the sources and fate of atmospheric CO₂. The possible effects of CO₂ outgassing and consequent risk assessment are also welcome.

Dr. Roberto M.R. Di Martino
Dr. Fátima Viveiros
Dr. María Clara Lamberti
Dr. Felipe Aguilera
Guest Editors

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• geological CO₂ emissions
• human-related CO₂ emissions
• carbon and oxygen isotopes of CO₂
• analytical techniques and methods
• human health in CO₂-polluted environments