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Nocturnal Intermittent Coupling Between the Interior of a Pine Forest and the Air Above It

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Abstract

A 1-year set of measurements of CO2 and energy turbulent fluxes above and within a 25-m pine forest in southern Brazil is analyzed. The study focuses on the coupling state between two levels and its impact on flux determination by the eddy-covariance method. The turbulent series are split in their typical temporal scales using the multiresolution decomposition, a method that allows proper identification of the time scales of the turbulent events. Initially, four case studies are presented: a continually turbulent, a continually calm, a calm then turbulent, and an intermittent night. During transitions from calm to turbulent, large scalar fluxes of opposing signs occur at both levels, suggesting the transference of air accumulated in the canopy during the stagnant period both upwards and downwards. Average fluxes are shown for the entire period as a function of turbulence intensity and a canopy Richardson number, used as an indicator of the canopy coupling state. Above the canopy, CO2 and sensible heat fluxes decrease in magnitude both at the neutral and at the very stable limit, while below the canopy they increase monotonically with the canopy Richardson number. Latent heat fluxes decrease at both levels as the canopy air becomes more stable. The average temporal scales of the turbulent fluxes at both levels approach each other in neutral conditions, indicating that the levels are coupled in that case. Average CO2 fluxes during turbulent periods that succeed very calm ones are appreciably larger than the overall average above the canopy and smaller than the average or negative within the canopy, indicating that the transfer of air accumulated during calm portions at later turbulent intervals affects the flux average. The implications of this process for mean flux determination are discussed.

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  1. Departamento de Física, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil

    Pablo E. S. Oliveira, Otávio C. Acevedo, Osvaldo L. L. Moraes, Hans R. Zimermann & Claudio Teichrieb

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  1. Pablo E. S. Oliveira
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  2. Otávio C. Acevedo
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  3. Osvaldo L. L. Moraes
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Correspondence to Pablo E. S. Oliveira.

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Oliveira, P.E.S., Acevedo, O.C., Moraes, O.L.L. et al. Nocturnal Intermittent Coupling Between the Interior of a Pine Forest and the Air Above It. Boundary-Layer Meteorol 146, 45–64 (2013). https://doi.org/10.1007/s10546-012-9756-z

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  • DOI: https://doi.org/10.1007/s10546-012-9756-z

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