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Description
This dataset provides atmospheric carbon dioxide (CO2), carbon monoxide (CO), and methane (CH4) concentrations as measured on a network of instrumented communications towers operated by the Atmospheric Carbon and Transport-America (ACT-America) project. ACT-America's mission spans five years and includes five 6-week intensive field campaigns covering all 4 seasons and 3 regions of the central and eastern United States. Tower-based measurements began in early 2015 and are continuously collecting CO2, CO, and CH4 data to characterize ground-level (>100 m) carbon background conditions to support the periodic airborne measurement campaigns and transport modeling conducted by ACT-America. The towers are instrumented with infrared cavity ring-down spectrometer systems (CRDS; Picarro Inc.). Data are reported for the highest sampling port on each tower. The averaging interval standard deviation and uncertainty derived from periodic flask sample to in-situ measurement comparisons are provided. Complete tower location, elevation, instrument height, and date/time information are also provided.
Product Summary
Platforms
FIXED OBSERVATION STATIONS
Instruments
SPECTROMETERS
Spatial Extent
N: 44.0502S: 30.1951E: -76.4188W: -98.588
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2015-01-01 to 2017-12-31
Data Partner
THE OAK RIDGE NATIONAL LABORATORY (ORNL) DISTRIBUTED ACTIVE ARCHIVE CENTER (DAAC) (ORNL_DAAC)
Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.
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Miles, N. L., Richardson, S. J., Martins, D. K., Davis, K. J., Lauvaux, T., Haupt, B. J., & Miller, S. K. (2018). ACT-America: L2 In Situ CO2, CO, and CH4 Concentrations from Towers, Eastern USA (Version 1.1). ORNL Distributed Active Archive Center. https://doi.org/10.3334/ORNLDAAC/1568 Date Accessed: 2026-05-13
Miles, N.L., S.J. Richardson, D.K. Martins, K.J. Davis, T. Lauvaux, B.J. Haupt, and S.K. Miller. “ACT-America: L2 In Situ CO2, CO, and CH4 Concentrations from Towers, Eastern USA.” ORNL Distributed Active Archive Center, January 1, 2018. doi:10.3334/ORNLDAAC/1568. Date Accessed: 2026-05-13
Miles, N. L., et al. ACT-America: L2 In Situ CO2, CO, and CH4 Concentrations from Towers, Eastern USA. 1.1, ORNL Distributed Active Archive Center, 1 Jan. 2018, doi:10.3334/ORNLDAAC/1568. Date Accessed: 2026-05-13
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