Five towers (shown in blue in the map above) are instrumented with Picarro Cavity Ring-Down Spectrometers to measure carbon dioxide (CO2) dry mole fractions. The samples are drawn from tubes placed at 100 m AGL. The sample air is dried using a Nafion dryer and a supplementary pump (reflux method). A field calibration tank is sampled daily, with a zero-offset correction applied to the data. A secondary line of tubing allows for periodic leak checks.
| Site | Install Date | Latitude | Longitude | Sample height (m AGL) |
Elevation (m ASL) |
| Tower AL-01 (Millerville GCI04) | 19 March 2015 – decommissioned Oct 2018 | 33.1759N | 85.8911W | ~100 | 328 |
| Tower FL-01 (Panama City GCI05) | 20 March 2015 – decommissioned Dec 2019 | 30.1951N | 85.8336W | ~100 | 5 |
| Tower MS-01 (Magee GCI03; southern MS) | 21 March 2015 – decommissioned Oct 2017 | 31.8869N | 89.7276W | ~100 | 132 |
| Tower MS-02 (Grenada GCI02; northern MS) | 23 March 2015 – decommissioned Oct 2019 | 33.7525N | 89.8539W | ~100 | 105 |
| Tower LA-01 (Monroe GCI01) | 22 March 2015 – decommissioned Oct 2018 | 32.4690N | 92.2829W | ~100 | 65 |
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