Apr 11, 2025 · CFCs are very stable chemical compounds, used in refrigerants, solvent, and (in the past in the U.S.) aerosols, which release chlorine (important) and fluorine (less important) into the upper atmosphere. In the stratosphere, CFCs are photolyzed (by incoming solar UV) to form carbon dioxide, CO2,

Mar 27, 2025 · HCFCs, with one or more hydrogen-carbon bonds are slated to replace CFCs in most of the current applications. HCFCs are more unstable and subject to hydroxyl radical and ozone attack early in their gas phase career in the atmosphere. Therefore, their atmospheric lifetime is projected to be shorter a

Apr 9, 2025 · GHGs include carbon dioxide, methane, nitrous oxide, chlorofluorocarbons (CFCs), ozone (O 3), and water vapor (H 2 O). Remotely sensed greenhouse gas data, such as the data collected by NASA’s Earth-observing satellites, are used in atmospheric models to estimate the sources and sinks of these gases.

The Intergovernmental Panel on Climate Change (IPCC) Special Report Emissions Scenarios (SRES) Fluor-Gases Emissions Dataset consists of global and regional emissions of Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), Sulfur Hexafluoride (SF6), Cholorfluorocarbons (CFCs) and Hydrochlorofluorocarbons (HCFCs) projected every 10 years …

Mar 1, 2021 · Starting in the 1970s, scientists had suspected that the ozone layer might be at risk. Chlorine-based compounds known as CFCs, very stable and long-lived on Earth’s surface, were slowly making their way into the upper atmosphere, where the additional UV light broke them apart into highly reactive chlorine molecules that tear ozone molecules ...

Apr 11, 2025 · Atmospheric Ozone is one of the most important trace gases in our atmosphere that both benefits and harms life on Earth. High ground-level ozone amounts contribute to poor air quality, adversely affecting human health, agricultural productivity, and forested ecosystems. Ozone absorbs infrared radiat

5 days ago · As this quote suggests, observations from sensors such as the Ozone Monitoring Instrument aboard NASA's Aura satellite, the agency's third flagship Earth Observing System satellite mission behind Terra and Aqua, have been critical for measuring criteria pollutants such as O 3, NO 2, SO 2, and ozone-destroying chlorofluorocarbons (CFCs).

chlorofluorocarbons (CFCs) in the atmosphere start a chain of chemical reactions on aerosol surfaces that destroy ozone molecules in the mid-latitude stratosphere, intensifying observed stratospheric ozone depletion. "While we have no observations, the 1963 Agung eruption on the island of Bali probably did not deplete

Jul 28, 2020 · Because approximately 20% of the chlorine in the atmosphere comes from a natural source of methyl chloride, the other 80% is thought to come from human-created sources — primarily chlorofluorocarbons, or CFCs. When CFCs rise to the stratosphere they are destroyed by high-energy ultraviolet sunlight.

CFCs. When CFCs rise to the stratosphere they are destroyed by high-energy ultraviolet sunlight. This destruction process works to pop chlorine atoms off the CFCs to form new constituents in the stratosphere. The now unstable chlorine atoms react with oxygen species to form one of three molecules — hydrogen chloride,