https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.6 2026-03-19T10:41:57.720Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/e78ae4ce-807a-4417-ad6e-a458c6da6638 CHLOROFLUOROCARBONS Date=2022-03-03 User Id=sritz Entity=NarrowerRelation Operation=INSERT User Note=Insert Concept System Note=add narrower relation New Value=CHLOROFLUOROCARBONS [e78ae4ce-807a-4417-ad6e-a458c6da6638,833781] - CFC-11 [94472216-6cd7-434b-beec-17067fb69b2e,836060] Date=2022-03-03 User Id=sritz Entity=NarrowerRelation Operation=INSERT User Note=Insert Concept System Note=add narrower relation New Value=CHLOROFLUOROCARBONS [e78ae4ce-807a-4417-ad6e-a458c6da6638,833781] - CFC-12 [97efdb7f-b2aa-4a6d-b338-30f3ad849c1f,836058] 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, hydrogen fluoride, HF, and ultimately (after multiple UV absorption events) chlorine radicals. These chlorine species are crucial in the destruction of the ozone layer over Antarctica and probably elsewhere (see chlorine). [Environmental Science and Technology; v 28; pages 1619-1622; 1994.] 2022-03-03 16:58:41.0