The Trinidad Head station is located atop Trinidad Head (elevation ~120 meters) on the remote north coast of California, approximately 30 km north of Eureka.
The AGAGE operates two in-situ instruments there. The GC-MD instrument started measuring atmospheric CFC-11, CFC-12, CFC-113, CH3CCl3, CCl4, N2O, CH4, and CHCl3 in 1995. Air samples are collected from a tower used by the US Coast Guard for marine radio communications. The Medusa GC-MS instrument which measures more than 50 greenhouse gases and ozone depleting substances was installed in May 2005.
NOAA’s Global Monitoring Division also measures a range of ozone depleting substances and (until 2017) greenhouse gases at Trinidad Head.
Air intake elevation:
Dr. Jens Mühle, Mail Code 0244
Scripps Institution of Oceanography
La Jolla, California, 92093