Yue, X., N. Unger, T. F. Keenan, X. Zhang, and C. S. Vogel. 2015. Probing the past 30-year phenology trend of US deciduous forests. Biogeosciences 12:4693-4709. doi:10.5194/bg-12-4693-2015 “Phenology is experiencing dramatic changes over deciduous forests in the USA. Estimates of trends in phenology on the continental scale are uncertain, however, with studies failing to agree on… More
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The 8th Colorado Flux Course (#fluxcourse; http://www.fluxcourse.org/) was recently convened up at Niwot Ridge, Colorado. Twenty-five students from across the US and globe came to hear lectures on eddy covariance, flux instrumentation, leaf cuvette systems, land surface modeling, remote sensing and data fusion modeling. Students also toured the Niwot Ridge AmeriFlux site (US-NR1) and visited NEON…. More
Evapotranspiration based on equilibrated relative humidity (ETRHEQ): Evaluation over the continental U.S. From Water Resources Research 51(4),2951-2973, 2015. DOI: 10.1002/2014WR016072. Copyright (2015) American Geophysical Union. Guido Salvucci’s group at Boston University are avid users of AmeriFlux data. There is a new paper in Water Resources Research that explores a way to estimate watershed scale evaporation…. More
Lianhong Gu’s book review on Terrestrial Biosphere-Atmosphere Fluxes (2014), by Russell Monson and Dennis Baldocchi, is now available at ESA 2015, Book Review, Ecology 96:1736: “Fluxes as functions of ecosystems and drivers of atmosphere.” Read the review at http://dx.doi.org/10.1890/BR15-24.1. “Monson and Baldocchi, two accomplished researchers and admired educators, masterfully incorporate real equations into a scientific storytelling… More
There is growing interest to use sun induced fluorescence to estimate ecosystem photosynthesis from space. This new paper from Yang et al tested indices from hyper spectral reflectance measurements with gross carbon fluxes at Harvard forest. Results look interesting and the response between SIF and GPP is much more linear than that between GPP and… More
If you missed the 2015 AmeriFlux Data and Tech Workshop, you can now view videos of several presentations from the workshop online. These presentation may be of use to AmeriFlux tower teams, AmeriFlux data users, and anyone with interest in flux, meteorological, and BADM data. Follow the links below to watch the presentation videos. See… More
Congratulations to Margaret Torn, AmeriFlux Management Project lead PI! Margaret received an honorary doctorate from the University of Zurich last Saturday, in recognition of her efforts to deeper understanding of biogeochemical processes and their climate implications of the soil-plant-atmosphere system, which contribute to science-based solutions to sustainable development of natural resources. She was one of… More
Check out this new feature on the AmeriFlux website. You can now request populated BADM templates for tower sites. To make a request: From the Data menu, choose Download Data. Click the BADM button. Use the form to specify which tower sites and templates you want. Click the Request BADM button. You will receive an… More
By Chad Hanson, AMP Tech Team. Many flux sites do not have access to line power, and run on solar power. This post shares my recent experience of building a simple solar system, and the design considerations that went into it. We hope this will help others as they design and maintain their own systems. Please use the Comments at the… More
During this past AmeriFlux PI Meeting, Gil Bohrer and Tim Morin presented a live demonstration of their Portable Canopy Lidar (PCL), shown in Figure 1, which was developed by their team. The system is based on Lidar (light detection and ranging), which uses pulsed laser light to measure distances based on “time-of-flight.” In the demo,… More