- Current observations
New paper on scalar transport in forests
New research paper: This paper links the turbulent transport in forest canopies via organized motion (coherent structures) to the carbon cycle. It explores the transport path of respiration pulses originating from the forest floor and the sub-canopy vegetation to better predict daytime ecosystem respiration, which is a highly sought-after quantity that is not readily available from eddy covariance measurements that only provide the net ecosystem exchange. Methods included state-of-the-art wavelet detection and analysis of coherent structures and a relaxed eddy accumulation techniques applied to turbuence time series collected at multiple levels at 3 forests in the US and Europe. The study's main finding is that the respiration pulses are mainly transported by coherent structures, which may help refine future conditional sampling approached to improve estimates of carbon cycle components in forest ecosystems.
Zeeman, M.J., Eugster, W. and Thomas, C.K., 2012. Concurrency of coherent structures and conditionally sampled daytime sub-canopy respiration. Boundary-Layer Meteorol.: in press. 10.1007/s10546-012-9745-2.