NOAA Nitrous Oxide (N2O) measurements first began in 1995 with samples taken from the CCGG cooperative air sampling network.


Data Use Policy

Note: Links are to zip archive files. Flask data is for discrete samples.

Note: CCGG ObsPack products contain data from all available sites and multiple gases.

View map and listing of the reference network sites...

Individual data sets can be searched for and downloaded from the GML Data Finder.

Search for and download data here.

Figures and Data from the Marine Boundary Layer (MBL) Reference are also available. The MBL is a data product derived directly from measurements of weekly air samples from the Cooperative Air Sampling Network.

Marine Boundary Layer Reference Data

Data from the Reference Network as well as data from over 400 agencies worldwide are available as ObsPack products. ObsPack products are designed to bring together direct atmospheric greenhouse gas measurements derived from multiple national or university laboratories, and package and distribute them in a set of self-documenting files. ObsPack products include a set of prepared data sets and metadata, a summary of included data sets, and an e-mail address list of all data providers.

Download ObsPack data products here.

n2o global trend plot

Top: Global average atmospheric nitrous oxide mixing ratios (blue line) determined using measurements from the Carbon Cycle cooperative air sampling network. The red line represents the long-term trend. Bottom: Global average growth rate for nitrous oxide.

n2o surface plot

Three-dimensional representation of the latitudinal distribution of atmospheric nitrous oxide in the marine boundary layer. Data from the Carbon Cycle cooperative air sampling network were used. The surface represents data smoothed in time and latitude.

n2o growth rate contour plot

Contour plot showing the temporal and spatial variations in the atmospheric increases of nitrous oxide. The cooler colors (green, blue) represent periods of lower than average growth rates and the warmer colors (yellow, orange, red) represent periods of higher growth rates. The plot is derived from measurements of samples collected at the Carbon Cycle cooperative air sampling network sites. The variations in the growth rate of this climatically important gas are due to interannual variations in the imbalance between sources and sinks, and also to variations in atmospheric transport.