The previous AmeriFlux Tech blog post regarding biases in CO2 flux measurements contributed by Manuel Helbig generated some questions from the community.  Campbell Scientific provided a detailed response to address the questions. The response describes the new gas analyzer operating system that accounts for the spectroscopic effects using high frequency sonic temperature. The response also includes a methodology… More

Updated May 24, 2017 to include response from Campbell Scientific (see bottom of post).  Across FLUXNET, CO2 fluxes between ecosystems and the atmosphere are measured using various open- and closed-path gas analyzers. A few years ago, Campbell Scientific introduced new open-path CO2/H2O gas analyzers (IRGA; EC150 and IRGASON), thus, further diversifying the choices for eddy covariance… More

Michael Benson, site manager at Morgan Monroe State Forest (US-MMS), notified the Tech Team of an important safety bulletin that affects many AmeriFlux tower workers. Some ladder safety system sleeves, model Lad-Saf, sold by Capitol Safety under the DBI-SALA brand are affected. Please view the full notice and contact the manufacturer if appropriate.  Thanks Michael!

At one of the NGEE Arctic sites in the Seward Peninsula, near the town of Council, Alaska, the Dream Team—myself, Oriana Chafe, Margaret Torn (NG Arctic team lead), Stan Wullschleger (NG Arctic PI), Mark Conrad, Bryan Curtis and Sigrid Dengel (AMP) (see photo, left to right)—is flying a DGI model Inspire-1 UAS (unmanned aircraft system, or drone)…. More

This year’s workshop is at Mountain Research Station, close to where the AmeriFlux Annual PI Meeting will take place in Golden CO, directly after this workshop. If you want to suggest a topic for the workshop, contact the organizers Sébastien Biraud (Tech) and Deb Agarwal (Data). Your suggestions are always very welcome! Update 7/19/16: No reg… More

The AmeriFlux Portable Eddy Covariance System (PECS) is used to evaluate data quality at sites in the AmeriFlux network. The PECS is deployed side-by-side for short deployments (10-14 days). The current PECS was designed and built by Dave Billesbach. The Tech Team has two PECS which allows simultaneous deployments. The PECS may be operated in different configurations depending… More

From the AmeriFlux-Community listserv. Thanks to Joydeep Bhattacharjee for asking, and David for this answer Joydeep: How do PIs across the network protect their equipment on towers against damage from lighting? David:  This question ought to unleash a flood of information and opinions, since lightning protection of sensitive instruments is a black art, similar to… 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