NCAR/ACOM FTIR Atmospheric Composition Dataset

The NCAR/ACOM Optical Techniques Project operates three high spectral resolution, solar viewing FTIR instruments at Thule, Greenland (76.5ºN, 291.3ºE, 225 masl), Boulder Colorado (40.03ºN, 254.7ºE, 1612 masl) and Mauna Loa Observatory Hawaii (19.5ºN, 204.4ºE, 3396 masl). These instruments operate within the framework of the Network for the Detection of Atmospheric Composition change (NDACC). The raw data are recorded autonomously and downloaded to ACOM servers daily. They are processed at ACOM and produce vertical profiles of several trace atmospheric constituents: O3, HNO3, HCl, HF, CO, N2O, CH4, HCN, C2H6, OCS, H2CO, H2O and ClONO2. These data constitute a long-term reference dataset for tropospheric and stratospheric chemistry investigations.

The data, along with metadata and full error analysis are saved to GEOMS conforming HDF files. Per our agreement with NDACC and our sponsor NASA, they are uploaded bi-yearly to the NDACC data handling facility (DHF) at For select species, HDF files are uploaded on a near-real-time basis for the CAMS27 project which use the data for realtime air quality forecasting. Once these data are uploaded they are publicly available. The NDACC has implemented Creative Commons licensing designations for data at the DHF. These data maintain a CC0 license.

To Access Resource:

Questions? Email Resource Support Contact:

  • James W. Hannigan
    UCAR/NCAR - Atmospheric Chemistry Observations and Modeling Laboratory

Temporal Range

  • Begin:  1995-08-01
    End:  2020-12-31


Resource Type dataset
Temporal Range Begin 1995-08-01
Temporal Range End 2020-12-31
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links

Quick Look at Current Data :

Data Listing by Species :

NCAR/ACOM Optical Techniques :


NDACC Infrared Working Group :

Tropospheric water vapor profiles obtained with FTIR: comparison with balloon-borne frost point hygrometers and influence on trace gas retrievals : Ortega, I., Buchholz, R. R., Hall, E. G., Hurst, D. F., Jordan, A. F., and Hannigan, J. W. (2019). Atmospheric Measurement Techniques, 12(2):873– 890.

Semiautonomous FTS Observation System for Remote Sensing of Stratospheric and Tropospheric Gases : Hannigan, J. W., Coffey, M. T., and Goldman, A. (2009). Journal of Atmospheric and Oceanic Technology, 26:1814–1828.

Additional Information N/A
Resource Format Hierarchical Data Format File (application/x-hdf)
Standardized Resource Format HDF
Asset Size N/A
Legal Constraints

Creative Commons Attribution 4.0 International License.

Access Constraints None
Software Implementation Language N/A

Resource Support Name James W. Hannigan
Resource Support Email
Resource Support Organization UCAR/NCAR - Atmospheric Chemistry Observations and Modeling Laboratory
Distributor N/A
Metadata Contact Name GDEX Curator
Metadata Contact Email
Metadata Contact Organization UCAR/NCAR - GDEX

Author Hannigan, James W.
Ortega, Ivan
Publisher UCAR/NCAR - GDEX
Publication Date 2021-12-07
Digital Object Identifier (DOI)
Alternate Identifier N/A
Resource Version N/A
Topic Category N/A
Progress N/A
Metadata Date 2022-10-20T10:12:05-06:00
Metadata Record Identifier edu.ucar.gdex::314ee986-c4ad-4d0b-b37e-947ff421ed2a
Metadata Language eng; USA
Suggested Citation Hannigan, James W., Ortega, Ivan. (2021). NCAR/ACOM FTIR Atmospheric Composition Dataset. UCAR/NCAR - GDEX. Accessed 19 May 2024.

Harvest Source