NEON infrared gas analyzer data, Niwot Ridge AmeriFlux site (US-NR1), 2013 – 2014

Eddy-covariance measurements are often used to directly monitor the surface-atmosphere exchange of shear, heat and trace gases between an ecosystem and the atmosphere. For this purpose high-frequency (≥10 Hz) data streams of a 3-D sonic anemometer and an IRGA are combined. However, if a GSS is used to sample air at a pre-defined location and to transport it to an IRGA for analysis, high-frequency spectral corrections can exceed 20% of the uncorrected values. NEON staff, in collaboration with scientists at LI-COR, Inc. and University of Colorado Boulder, conducted a study to evaluate the impacts of individual components of the GSS (e.g., particulate filter, rain cap, etc.) on eddy-covariance system performance. The objective was to determine an optimal combination of IRGA and GSS that (i) maximizes system practicability, and (ii) minimizes high-frequency spectral losses.
This dataset contains all IRGA in-situ test data in the form of a multivolume .zip archive. The .zip.001, .zip.002 etc. files can be downloaded individually, and need to be in the same folder for extraction with software such as 7-zip. For extraction the software should be pointed only to the .zip.001 volume, and the contents of all subsequent volumes are detected and extracted automatically.
Alternatively, it is possible to “select all” during the download operation. However, the resulting .zip container is quite large (~40 GB) and thus more prone to network interruptions. Also, a “headers error” can be expected during initial extraction of the container, and a subsequent extraction of the multivolume archive is still necessary.