publications by year

Selected Publications

My CV can be found here, my Google Scholar page is here and my Research Gate page is here. Links to directly downloadable papers are provided when possible - these are for individual use only; links to journals are also provided, but might not be available to users without campus library access. All papers are available upon request.

Entries in oliver sonnentag (4)

Friday
May132011

Challenges of measuring methane over peatlands

Baldocchi, D., M. Detto, O. Sonnentag, J. Verfaillie, Y. A. Teh, W. Silver, and M. Kelly. 2012. The challenges of measuring methane fluxes and concentrations over a peatland pasture. Agricultural and Forest Meteorology 153(1): 177-187

We report on methane (CH4) concentrations and efflux densities that were measured over a drained and grazed, peatland pasture in the Sacramento-San Joaquin River Delta of California over a three year period. The site was ideal for micrometeorological flux measurements due to its very flat topography, its exposure to vigorous winds and its extended fetch along the predominant wind direction. Nevertheless, the interpretation of methane fluxes with eddy covariance proved to be extremely complicated by a number of geographical, biophysical, biogeochemical and site management factors.

Keywords: Eddy covariance . Peatland . Wetland . Cattle . Rice . Methane . Laser spectrometer . Biogeochemistry

Friday
Apr082011

Tracking the structural and functional development of a perennial pepperweed 

Sonnentag O, Vargas R, Detto M, Runkle BRK, Kelly M, and Baldocchi DD. 2011. Tracking the structural and functional development of a perennial pepperweed (Lepidium latifolium L.) infestation using a multi-year archive of webcam imagery and eddy covariance measurements. Agricultural Forest Meteorology: 151:916-926

We explore the ability of red (R)–green (G)–blue (B) color space information to track the structural and functional development of a perennial pepperweed (Lepidium latifolium L.) infestation in California.

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Tuesday
Feb082011

Greenhouse gas emissions from a temperate peatland pasture

Teh, Y. A., W. L. Silver, O. Sonnentag, M. Detto, M. Kelly, and D. D. Baldocchi. 2011. Large Greenhouse Gas Emissions from a Temperate Peatland Pasture. Ecosystems 14: 311–325

We report greenhouse gas fluxes (CH4, CO2, N2O) from a drained peatland in the Sacramento-San Joaquin River Delta, California, USA currently managed as a rangeland.

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Friday
Dec172010

Carbon dioxide exchange of a pepperweed infestation

Sonnentag, O., M. Detto, B. Runkle, Y. Teh, W. Silver, M. Kelly, and D. D. Baldocchi. 2011. Carbon dioxide exchange of a pepperweed (Lepidium latifolium L.) infestation: how do flowering and mowing affect canopy photosynthesis and autotrophic respiration? J. Geophys. Res., 116, G01021, doi:10.1029/2010JG001522

We analyzed CO2 flux measurements made with eddy covariance over a pepperweed infestation in California, covering three growing seasons. We found that unmowed pepperweed caused the site to be almost CO2 neutral or a net source, and mowing during early flowering caused the site to act as a net CO2 sink.

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