News

New instruments added to Imnavait Creek

May
23

In June 2012, we will be improving our research sites at Imnavait Cr with the addition of several sensors and webcams:

  • We will install an open path, fast-response methane analyzer at the Fen site.  This instrument will measure methane fluxes from the wet sedge tundra ecosystem at this site during the summer months and shoulder seasons.  This information can be combined with our existing CO2 monitoring and with streamflow carbon data to construct a comprehensive carbon budget for the Imnavait basin.
  • We will be testing a new hybrid closed path CO2/H2O analyzer at the Ridge site.  If the cold weather performance of this system is good, we anticipate better data coverage during the winter since the optical path is enclosed thereby avoiding ice and snow accumulation.
  • In order to record seasonal changes and create a visual record of plant phenology, we are installing webcams at each of the three Inmavait Cr sites.  The cameras will be mounted at ~3m, aimed downward at the vegetation with about 20% horizon, and capture several images per day.  Our existing Ridge webcam images, as well as those at nearby Toolik Field Station, have been used to monitor snow cover, animal migration, weather conditions for field work and aviation and for troubleshooting tower instruments.  The new images will be available on this website and also as part of the PhenoCam network.

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Welcome to the new AON website

May
09

We hope you will enjoy our new website.  Please click around and learn about our research and the people and organizations that make it possible.  If you have any problems or wish to comment, please contact the webmaster.  Thank you!


 

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First round of upgrades planned at Imnavait Cr

Feb
15

As the first step in upgrading the Tussock station to year-round operation with satellite data/communciations support, we will begin placing equipment at the site in March. A temporary expansion of the renewable energy and communication systems will precede the full upgrade this summer. We also hope to test new analyzers purchased as part of our newly funded research efforts.

Moxa wireless client access point

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Publication of Imnavait data in Ecosphere

Jan
30

We have a new paper out in Ecosphere this month discussing multiyear results of our work at Imnavait Cr.  Click here for the abstract or the full article, titled Seasonal Patterns of Carbon Dioxide and Water Fluxes in Three Representative Tundra Ecosystems in Northern Alaska.

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Renewal proposal is funded

Nov
01

The National Science Foundation has approved our renewal proposal to continue and expand monitoring of carbon, water and energy fluxes at the established AON sites in Alaska and Russia. Understanding the role of these key processes in regulating basic ecosystem functions and their response to climate change remain the primary objectives of our research. Through continuing collaborations between UAF, U-M and MBL, we will also initiate studies of methane flux at the Fen station and water chemistry at Imnavait Cr. In 2012, the Tussock station will be upgraded to year-round data collection and the Fen station will begin continuous methane flux monitoring.

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Imnavait Cr sites are prepared for winter

Oct
28

The Ridge and Fen stations were prepared for their fifth winter season of year-round eddy covariance measurements. The seasonally operated Tussock station will revert to recording only meteorological data for the darkest portion of winter. All gas analyzers were calibrated, and communications equipment is now fine tuned for power savings during winter operation.

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A successful visit to Cherskiy, Russia

Sep
27

Operations were restored to the carbon dioxide flux component at the 35m tower in Pleistocene Park (near Cherskiy). The eddy covariance instruments were calibrated and redeployed after wiring failures halted data collection in spring 2010. We are looking forward to continuing both the carbon dioxide and methane flux measurements in Siberia and are currently planning further improvements.

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Imnavait webcam repaired

Jul
29

A replacement webcam was installed at the Imnavait Cr. Ridge site after the previousunit failed in March. The angle and field of view are comparable, though slightly different, to those of the previous camera. Check back soon for an improved webcam archiving tool. Please visit here for more local image monitoring from nearby Toolik Field Station.

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Version system introduced to AON data sets

Jul
01

The Data page now displays a version number along side each data set, with a corresponding number appearing within the file header. Version numbers are automatically updated if files are updated or reprocessed. This will help ensure that data users are able to easily see if a file is up to date. All files from prior years were set to version 10 by default. Contact Colin Edgar for more details.

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Tussock Station at Imnavait Creek now operational

Mar
03

The Tussock station is up and running at Imnavait Creek. It is operating this season with an improved power system and will collect data until mid-October, when it enters hibernation for the winter.

Tussock

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