1. Half or more of US NEE may be in mountainous regions
US Elevation Map
Niwot Ridge NEE
% Area

2. Regional Atmospheric Continuous CO2 Network in the Rocky Mountains (Rocky RACCOON)
Existing and Planned NACP CO2 Sites
Existing () and Planned (O) Sites
Potential Future Sites (O)
(courtesy S. Denning)

3. Autonomous, Inexpensive, Robust CO2 Analyzer (AIRCOA)
Goal: 0.1 ppm precision and 0.1 ppm reproducibility on 2.5 min. measurements
$10K in parts ($20K total) and operates autonomously for months at a time

4. Laboratory intercomparisons
Laboratory offsets less than 0.05 ppm (1-sigma = 0.13 ppm)
Field surveillance tanks
2.5-month average field differences from assigned values 0.01 to 0.10 ppm (1-sigma = 0.10 to 0.13 ppm)

5. Automated web-based output