Reference : Estimating nocturnal ecosystem respiration from the vertical turbulent flux and change i...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Life sciences : Phytobiology (plant sciences, forestry, mycology...)
Life sciences : Agriculture & agronomy
http://hdl.handle.net/2268/32313
Estimating nocturnal ecosystem respiration from the vertical turbulent flux and change in storage of CO2
English
van Gorsel, Eva [> > > >]
Delpierre, Nicolas [> > > >]
Leuning, Ray [> > > >]
Black, Andy [> > > >]
Munger, J William [> > > >]
Wofsy, Steven [> > > >]
Aubinet, Marc mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Feigenwinter, Christian [Université de Liège > Gembloux Agro-Bio Tech > Physique des Biosystèmes > >]
Beringer, Jason [> > > >]
Bonal, Damien [> > > >]
Chen, Baozhang [> > > >]
Chen, Jiquan [> > > >]
Clement, Robert [> > > >]
Davis, Kenneth J [> > > >]
Desai, Ankur R [> > > >]
Dragoni, Danilo [> > > >]
Etzold, Sophia [> > > >]
Gruenwald, Thomas [> > > >]
Gu, Lianhong [> > > >]
Heinesch, Bernard [Université de Liège > Gembloux Agro-Bio Tech > Physique des Biosystèmes > >]
Hutyra, Lucy R [> > > >]
Jans, Wilma W P [> > > >]
Kutsch, Werner [> > > >]
Law, B. E. [> > > >]
Leclerc, Monique Y. [> > > >]
Mammarella, Ivan [> > > >]
Montagnani, Leonardo [> > > >]
Noormets, Asko [> > > >]
Rebmann, Corinna [> > > >]
Wharton, Sonia [> > > >]
2009
Agricultural and Forest Meteorology
Elsevier Science
149
11
1919-1930
Yes (verified by ORBi)
International
0168-1923
Amsterdam
The Netherlands
[en] Ecosystem respiration ; Micrometeorology ; Advection ; u-star correction ; Eddy covariance ; Chamber ; Process-based modelling
[en] Micrometeorological measurements of night time ecosystem respiration can be systematically biased when stable atmospheric conditions lead to drainage flows associated with decoupling of air flow above and within plant canopies. The associated horizontal and vertical advective fluxes cannot be measured using instrumentation on the single towers typically used at micrometeorological sites. A common approach to minimize bias is to use a threshold in friction velocity, u*, to exclude periods when advection is assumed to be important, but this is problematic in situations when in-canopy flows are decoupled from the flow above. Using data from 25 flux stations in a wide variety of forest ecosystems globally, we examine the generality of a novel approach to estimating nocturnal respiration developed by van Gorsel et al. (van Gorsel, E., Leuning, R., Cleugh, H.A., Keith, H., Suni, T., 2007. Nocturnal carbon efflux: reconciliation of eddy covariance and chamber measurements using an alternative to the u*-threshold filtering technique. Tellus 59B, 397-403, Tellus, 59B, 307-403). The approach is based on the assumption that advection is small relative to the vertical turbulent flux (F-C) and change in storage (F-S) of CO2 in the few hours after sundown. The sum of F-C and F-S reach a maximum during this period which is used to derive a temperature response function for ecosystem respiration. Measured hourly soil temperatures are then used with this function to estimate respiration R-Rmax. The new approach yielded excellent agreement with (1) independent measurements using respiration chambers, (2) with estimates using ecosystem light-response curves of F-c + F-s extrapolated to zero light, R-LRC, and (3) with a detailed process-based forest ecosystem model, R-cast. At most sites respiration rates estimated using the u*-filter, R-ust, were smaller than R-Rmax, and R-LRC. Agreement of our approach with independent measurements indicates that R-Rmax, provides an excellent estimate of nighttime ecosystem respiration. (C) 2009 Elsevier B.V. All rights reserved.
http://hdl.handle.net/2268/32313
10.1016/j.agrformet.2009.06.020

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