Mauna Loa Observatory

Mauna Loa Observatory (MLO), situated on Hawaii’s Mauna Loa volcano, is an atmospheric baseline station operated by the National Oceanic and Atmospheric Administration (NOAA). Under an agreement with NOAA, Environment and Climate Change Canada (ECCC) owns two Brewer instruments at the site (009 and 119), which NOAA maintains. During calibration visits, ECCC also deploys one or occasionally two Triad instruments to conduct absolute calibrations. MLO’s high elevation, equatorial location, and minimal local pollution make it an optimal site for these measurements

Network Layout

MLO Calibration Timing

MLO (Earliest Absolute Calibration) Spring Sun

GMT Timezone		Local Canada/Honolulu (UTC -10)
MM/DD	HH:mm:ss	MM	dd	HH	mm	ss	AirMass
2/11	18:00:00	2	11	8	0	0	3.99842
2/11	18:30:00	2	11	8	30	0	2.79934
2/11	19:00:00	2	11	9	0	0	2.18467
2/11	19:30:00	2	11	9	30	0	1.82005
2/11	20:00:00	2	11	10	0	0	1.58585
2/11	20:30:00	2	11	10	30	0	1.4292
2/11	21:00:00	2	11	11	0	0	1.32354
2/11	21:30:00	2	11	11	30	0	1.25442
2/11	22:00:00	2	11	12	0	0	1.21381
2/11	22:30:00	2	11	12	30	0	1.19745
2/11	23:00:00	2	11	13	0	0	1.20373
2/11	23:30:00	2	11	13	30	0	1.23327
2/12	0:00:00	2	11	14	0	0	1.28905
2/12	0:30:00	2	11	14	30	0	1.37725
2/12	1:00:00	2	11	15	0	0	1.50899
2/12	1:30:00	2	11	15	30	0	1.70445
2/12	2:00:00	2	11	16	0	0	2.00216
2/12	2:30:00	2	11	16	30	0	2.48385
2/12	3:00:00	2	11	17	0	0	3.35488

MLO (Latest Absolute Calibration) Fall Sun

GMT Timezone		Local Canada/Honolulu (UTC -10)
MM/DD	HH:mm:ss	MM	dd	HH	mm	ss	AirMass
10/30	17:30:00	10	30	7	30	0	3.95874
10/30	18:00:00	10	30	8	0	0	2.78103
10/30	18:30:00	10	30	8	30	0	2.17455
10/30	19:00:00	10	30	9	0	0	1.81391
10/30	19:30:00	10	30	9	30	0	1.58197
10/30	20:00:00	10	30	10	0	0	1.42676
10/30	20:30:00	10	30	10	30	0	1.32211
10/30	21:00:00	10	30	11	0	0	1.25377
10/30	21:30:00	10	30	11	30	0	1.2138
10/30	22:00:00	10	30	12	0	0	1.19805
10/30	22:30:00	10	30	12	30	0	1.20495
10/30	23:00:00	10	30	13	0	0	1.23518
10/30	23:30:00	10	30	13	30	0	1.2918
10/31	0:00:00	10	30	14	0	0	1.38108
10/31	0:30:00	10	30	14	30	0	1.51438
10/31	1:00:00	10	30	15	0	0	1.71222
10/31	1:30:00	10	30	15	30	0	2.01393
10/31	2:00:00	10	30	16	0	0	2.50329
10/31	2:30:00	10	30	16	30	0	3.39207