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Mauna Loa Observatory
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The Observatory from air.

Satellite image of the summit of Mauna Loa overlaid with 100-meter contour lines.
The
Mauna Loa Observatory (MLO) is an
atmospheric baseline station on
Mauna Loa, on the island of
Hawaii.
The observatory

Two domes house solar sensors.

The Keeling Curve: Atmospheric CO2 concentrations as measured at Mauna Loa Observatory
Since 1956 Mauna Loa Observatory (MLO) has been monitoring and collecting data relating to atmospheric change, and is known especially for the
continuous monitoring of atmospheric
carbon dioxide (CO2), which is sometimes referred to as the
Keeling Curve. The observatory is under the
Earth System Research Laboratory which is part of the
National Oceanic and Atmospheric Administration(NOAA). According to the NOAA, Mauna Loa is the world's oldest continuous CO2 monitoring station, and the world's primary benchmark site for measurement of the gas.
[1]
The latest observation of CO2 concentrations from MLO can be found at web sites along with data from other sites
[2] and trends at Mauna Loa.
[3] The MLO levels can be compared with other sites in the global monitoring network.
MLO has activities at five locations on the Big Island. The primary observing site is located at the 3397 m (11,141 ft) level on Mauna Loa's north slope (
19°32′10″N 155°34′34″WCoordinates:
19°32′10″N 155°34′34″W) about 5 km north of the summit
Mokuaweoweo. The
Mauna Loa Solar Observatory shares this site. The administration and some data processing are done in the
Hilo, Hawaii office. Kulani Mauka is a rain collection site. Cape Kumukahi is a flask sample site located on the easternmost point of Hawaii. At the
Hilo airport, weekly balloon-borne instruments are prepared and launched to measure
ozone from the surface to usually over 30 km.
[4] The observatory site is also a temporary home to a
cosmic microwave background observatory called
AMiBA.
[5]
Mauna Loa was originally chosen as a monitoring site because, located far from any continent, the air was sampled and is a good average for the central Pacific. Being high, it is above the
inversion layer where most of the local effects are present and there was already a rough road to the summit built by the military. The contamination from local volcanic sources is sometimes detected at the observatory, and is then removed from the background data.
[6]