Carbon dioxide tops 400 ppm at Mauna Loa, Hawaii
Article first published online: 21 MAY 2013
©2013. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 94, Issue 21, page 192, 21 May 2013
How to Cite
2013), Carbon dioxide tops 400 ppm at Mauna Loa, Hawaii, Eos Trans. AGU, 94(21), 192.(
- Issue published online: 21 MAY 2013
- Article first published online: 21 MAY 2013
- Cited By
- carbon dioxide (CO2);
- daily mean concentration;
The daily mean concentration of carbon dioxide (CO2) in the atmosphere at Mauna Loa, Hawaii, hit 400.03 parts per million (ppm) on 9 May, marking the first time the concentration there has topped 400 ppm since measurements began at Mauna Loa in 1958, the U.S. National Oceanic and Atmospheric Administration (NOAA) announced on 10 May. NOAA scientists with the agency's Global Monitoring Division have made measurements of CO2 at the NOAA Mauna Loa Observatory since 1974.