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Original Research Papers

Nocturnal carbon efflux: reconciliation of eddy covariance and chamber measurements using an alternative to the u∗-threshold filtering technique

Authors:

Eva Van Gorsel ,

CSIRO Marine and Atmospheric Research, P.O. Box 1666, Canberra, ACT 2601, AU
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Ray Leuning,

CSIRO Marine and Atmospheric Research, P.O. Box 1666, Canberra, ACT 2601, AU
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Helen A. Cleugh,

CSIRO Marine and Atmospheric Research, P.O. Box 1666, Canberra, ACT 2601, AU
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Heather Keith,

CSIRO Climate Program, PO Box 3023, Canberra, ACT 2601, AU
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Tanja Suni

CSIRO Marine and Atmospheric Research, P.O. Box 1666, Canberra, ACT 2601, AU
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Abstract

Micrometeorological measurements made on single towers often underestimate nighttime respiration of terrestrial ecosystems because they cannot account for vertical and horizontal advection, thereby causing systematic errors in estimates of net ecosystem carbon exchange. We show that there is a maximum in the sum of the turbulent flux and change in storage of CO2 in the early evening, Rmax, that is in close agreement with concurrent and independent estimates of net carbon exchange from soil and plant chambers.We hypothesize that the peak occurs because there is a time delay between the onset of radiative cooling and the development of temperature gradients that are strong enough to initiate thermally-driven horizontal and vertical flows that remove the stored CO2. We propose taking advantage of this time delay to develop relationships between Rmax and soil temperature and moisture. The new parameterization leads to realistic values of nighttime respiration, and therefore to improved estimates of net ecosystem exchange.

How to Cite: Van Gorsel, E., Leuning, R., Cleugh, H.A., Keith, H. and Suni, T., 2007. Nocturnal carbon efflux: reconciliation of eddy covariance and chamber measurements using an alternative to the u∗-threshold filtering technique. Tellus B: Chemical and Physical Meteorology, 59(3), pp.397–403. DOI: http://doi.org/10.1111/j.1600-0889.2007.00252.x
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  Published on 01 Jan 2007
 Accepted on 25 Oct 2006            Submitted on 28 Apr 2006

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