Image: HCFC and HFC atmospheric trends

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Description: These graphs show the observed atmospheric changes for several common man-made halocarbons. The abundance of each gas is shown in parts per trillion (ppt). Multiple samples of each gas are gathered from sites around the world in the NOAA/GML Flask Sampling Network (colored lines). The gases shown are: hydrochlorofluorocarbons (HCFCs): 22, 141b, and 142b hydrofluorocarbons (HFCs): 32, 125, 134a, 143a, 152a, 227ea, and 365mfc The manufacturing of the HCFCs is scheduled to be transitioned to HFCs within most major markets by year 2020. Locations sampled include: ALT - Alert, NWT, Canada BRW - Point Barrow, Alaska CGO - Cape Grim, Tasmania KUM - Cape Kumukahi, Hawaii MLO - Mauna Loa, Hawaii NWR - Niwot Ridge, Colorado SMO - American Samoa THD - Trinidad Head, California SPO - South Pole, Antarctica Source Credit: Stephen A. Montzka and James W. Elkins / Halocarbons and Other Atmospheric Trace Species Group / Global Monitoring Division / Earth Systems Research Laboratories / United States National Oceanic and Atmospheric Administration https://www.esrl.noaa.gov/gmd/hats/
Title: HCFC and HFC atmospheric trends
Credit: https://www.esrl.noaa.gov/gmd/hats/about/hcfc.html
Author: James W. Elkins and Stephen A. Montzka
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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