Publications

Publications Found: 20
On the energy balance closure and net radiation in complex terrain
Wohlfahrt, G., Hammerle, A., Niedrist, G., Scholz, K., Tomelleri, E., Zhao, P.
In complex, sloping terrain, horizontal measurements of net radiation are not reflective of the radiative energy available for the conductive and convective heat exchange of the underlying surface. Using data from a grassland site on a mountain slope characterised by spatial heterogeneity in inclination and aspect, we tested the…
Journal: Agicultural and Forest Meteorology, Volume 226-227: 37-49 (2016), ISBN 01681923. DOI: 10.1016/j.agrformet.2016.05.012

Contribution of advection to nighttime ecosystem respiration at a mountain grassland in complex terrain
Galvagno, M., Wohlfahrt, G., Cremonese, E., Filippa, G., Migliavacca, M., Mora di Cella, U., van Gorsel, E.
Net ecosystem carbon dioxide (CO2) exchange (NEE) at FLUXNET sites is typically evaluated by means of the eddy covariance technique using a set of instruments on a single tower. However, in complex terrain, such as mountain areas, and during nighttime atmospheric conditions, with low turbulent mixing and stable stratification, t…
Journal: Agicultural and Forest Meteorology, Volume 237-238: 270-281 (2017), ISBN 01681923. DOI: 10.1016/j.agrformet.2017.02.018

Revisiting the choice of the driving temperature for eddy covariance CO2 flux partitioning
Wohlfahrt, G., Galvagno M.
So-called CO2 flux partitioning algorithms are widely used to partition the net ecosystem CO2 exchange into the two component fluxes, gross primary productivity and ecosystem respiration. Common CO2 flux partitioning algorithms conceptualise ecosystem respiration to originate from a single source, requiring the choice of a corre…
Journal: Agicultural and Forest Meteorology, Volume 237-238: 135-142 (2017), ISBN 01681923. DOI: 10.1016/j.agrformet.2017.02.012

Ground heat flux: An analytical review of 6 models evaluated at 88 sites and globally
Purdy, A. J., J. B. Fisher, M. L. Goulden, and J. S. Famiglietti
Purdy, A. J., J. B. Fisher, M. L. Goulden, and J. S. Famiglietti. 2016. Ground heat flux: An analytical review of 6 models evaluated at 88 sites and globally. Journal of Geophysical Research: Biogeosciences 121:3045-3059.…
Journal: Journal of Geophysical Research: Biogeosciences, Volume : 3045-3059 (2016). DOI: 10.1002/2016JG003591

Terrestrial Carbon Cycle Variability
Baldocchi, D., Ryu, Y., Keenan, T.
A growing literature is reporting on how the terrestrial carbon cycle is experiencing year-to-year variability because of climate anomalies and trends caused by global change. As CO2 concentration records in the atmosphere exceed 50 years and as satellite records reach over 30 years in length, we are becoming better able to addr…
Journal: F1000Research, Volume : 1-9 (2016). DOI: 10.12688/f1000research.8962.1

Decrease in winter respiration explains 25% of the annual northern forest carbon sink enhancement over the last 30 years.
Yu, Z., J. X. Wang, S. R. Liu, S. L. Piao, P. Ciais, S. W. Running, B. Poulter, J. S. Rentch, and P. S. Sun
IAim Winter snow has been suggested to regulate terrestrial carbon (C) cycling by modifying microclimate, but the impacts of change in snow cover on the annual C budget at a large scale are poorly understood. Our aim is to quantify the C balance under changing snow depth. Location Non-permafrost region of the northern forest…
Journal: Global Ecology and Biogeography, Volume 25: 586-595 (2016). DOI: 10.1111/geb.12441

The many meanings of gross photosynthesis and their implication for photosynthesis research from leaf to globe
Wohlfahrt G., Gu L.
Gross photosynthesis is a key term and concept in carbon cycle science. It however turns out that this term has been and is used with different meanings by different communities – either with (historically referred to as apparent photosynthesis) or without (historically referred to as true photosynthesis) including photorespir…
Journal: Plant, Cell and Environment, Volume 38 (12): 2500-2507 (2015). DOI: 10.1111/pce.12569

Upscaling of methane exchange in a boreal forest using soil chamber measurements and high-resolution LiDAR elevation data
Sundqvist, E., Persson, A., Kljun, N., Vestin, P., Chasmera, L., Hopkinson, C. and Lindroth, A.
Forest soils are generally considered to be net sinks of methane (CH4), but CH4 fluxes vary spatially depending on soil conditions. Measuring CH4exchange with chambers, which are commonly used for this purpose, might not result in representative fluxes at site scale. Appropriate methods for upscaling CH4fluxes from point measure…
Journal: Agricultural and Forest Meteorology, Volume 214-215: 393-401 (2015). DOI: 10.1016

Methane exchange in a boreal forest estimated by gradient method
Sundqvist, E., Mölder, M., Crill, P., Kljun, N and Lindroth, A.
Forests are generally considered to be net sinks of atmospheric methane (CH4) because of oxidation by methanotrophic bacteria in well-aerated forests soils. However, emissions from wet forest soils, and sometimes canopy fluxes, are often neglected when quantifying the CH4 budget of a forest. We used a modified Bowen ratio method…
Journal: Tellus B, Volume 67: 1-15 (2015). DOI:

Seeing the Fields and Forests: Application of Surface-Layer Theory and Flux-Tower Data to Calculating Vegetation Canopy Height
Pennypacker, S. and Baldocchi, D.
Canopy height is an important and dynamic site variable that affects the mass and energy exchanges between vegetation and the atmosphere. We develop a method to estimate canopy height routinely, using surface-layer theory and turbulence measurements made from a collection of flux towers. This tool is based on connecting the loga…
Journal: Boundary-Layer Meteorology, Volume : 1-18 (2015). DOI: 10.1007/s10546-015-0090-0