Current Data

Quick plots of total column data for a number of species of interest, from the Optical Technique’s three NDACC stations at Thule Greenland (76ºN, red), Mauna Loa, HI (20ºN green) and Boulder, CO (40ºN, blue). The left column are the long term time series from inception and shown as the 15-day average of the total column, where the vertical bar is 1 standard deviation of the average.  These plots are updated semi-annually. The right column are data processed every 15 days as part of our ‘rapid delivery’ (RD) data product. These are individual total columns (1 to several per day) where the vertical bar is the uncertainty in the retrieval.  These are plotted from 12 months prior to present.

The long term and some RD data are available at the NDACC Data Handling Facility and at the UCAR DASH repository.  See also the DASH Archive Listing for the data available.

Contact us for more information. 

Acetylene (C2H2)


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Ammonia (NH3)


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Carbon monoxide (CO)


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Carbonyl sulfide (OCS)


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Chlorine nitrate (CLONO2)


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Ethane (C2H6)


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Formaldehyde (H2CO)


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Hydrochloric acid (HCL)


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Hydrogen cyanide (HCN)


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Hydrogen fluoride (HF)


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Methane (CH4)


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Nitric acid (HNO3)


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Nitrous oxide (N2O)


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Ozone (O3)


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ACOM | Atmospheric Chemistry Observations & Modeling