Nocturnal CO2 exchange over a tall forest canopy associated with intermittent low-level jet activity |
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| Authors: | A Karipot M Y Leclerc G Zhang T Martin G Starr D Hollinger J H McCaughey G R Hendrey |
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| Institution: | (1) Laboratory for Environmental Physics, The University of Georgia, Griffin, Georgia, USA;(2) School of Forest Resources and Conservation, University of Florida, Gainesville, Florida, USA;(3) USDA Forest Service, Northeastern Research Station, Durham, New Hampshire, USA;(4) Department of Geography, Queens University, Kingston, Ontario, Canada;(5) Queen’s University, CUNY, New York, USA |
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| Abstract: | Summary Nocturnal eddy-covariance carbon dioxide fluxes have uncertainties arising from non-stationary atmospheric processes. Low-level
jets (LLJ) are one of the prominent nocturnal boundary-layer phenomena observed over non-mountainous terrain, and are capable
of generating shear and turbulence close to the ground. The influence of intermittent LLJ activity on nocturnal carbon dioxide
exchange measurements is investigated using wind profile observations and eddy-covariance flux measurements over a tall forest
canopy. Results suggest that the buildup and venting of CO2 are closely associated with LLJ activity during the night. Of significance in quantifying nocturnal fluxes, this paper demonstrates
how low-level jet activity introduces sporadic coupling between the canopy and the atmosphere. |
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