Footprint climatology estimation of potential control ring contamination

Long-term airport weather observations, calibrated by on-site measurements, were used to create a footprint climatology for the Forest Atmosphere Carbon Dioxide Transfer and Storage-1 (FACTS-1) site in the Duke Forest, NC. The footprint was centered over each 30-m diameter control ring to estimate p...

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Bibliographic Details
Published in:Agricultural and forest meteorology 2000, Vol.100 (1), p.73-82
Main Authors: Stoughton, Thomas E., Miller, David R., Yang, Xiusheng, Hendrey, George M.
Format: Article
Language:English
Subjects:
Carbon dioxide enrichment
Fetch
Footprint
Stability
Surface roughness
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Summary:Long-term airport weather observations, calibrated by on-site measurements, were used to create a footprint climatology for the Forest Atmosphere Carbon Dioxide Transfer and Storage-1 (FACTS-1) site in the Duke Forest, NC. The footprint was centered over each 30-m diameter control ring to estimate potential contamination from four CO 2-enriched rings at the site. The footprint partitions the upward fluxing CO 2 at any canopy-top point into relative contributions from grids in the surrounding forest. Additional footprints were generated for taller forest heights to estimate potential contamination levels at the site as the forest grows. The results showed a small percentage of flux originating from enriched areas of the site reaching the control rings. The ring with the highest contamination received 1% of its total scalar flux from enriched areas. As the forest grows, the absolute contribution from the enriched rings will increase slightly, but the proportional contribution will decrease with time due to increases in canopy roughness and a larger footprint (greater fetch) during stable conditions.
ISSN:0168-1923
1873-2240
DOI:10.1016/S0168-1923(99)00077-5