News

Site visit report - Cherskiy 2014

Sep
18

In August we visited our sites in Cherskiy Russia again for annual maintenance and site characterization surveys.  We calibrated the CO2/H2O IRGAs and made some small repairs and adjustments to the other sensors.  The CO2 height profile system was improved by adding thermistors at each intake height, and the automatic calibration gas injector was fixed.  Vegetation in the tower footprint was compared against a rough map, delineating land cover and rough funtional type.  The tall tower footprint is quite large at ~1500m radius from tower.  We improved the map and made thaw depth measurements.  A publication of our findings from the Russian site is in the works, stay tuned!

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Site visit report - Cherskiy 2013

Oct
07

Repairs, calibrations and upgrades were made during late August at the Pleistocene Park tall tower near Cherskiy, Russia.  An automated CO2 height profile measurement system was installed to help assess the role of periodic CO2 storage in daily or hourly flux estimates.  During periods of low wind, such as commonly occur during night-time, turbulent mixing of CO2 can be reduced such that levels near the ground may differ from the concentration observed at the eddy covariance measurement height.   Our system will measure 5 different heights from 2m to 35m along the tower several times per hour.  This year looks to be the best yet in term of getting continuous high-quality flux measurements from this site, thanks to the efforts of our Russian colleagues. 

PPark tower

 

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Imnavait Cr Biomass harvest - Aug 2013

Aug
09

We performed a detailed biomass harvest of tundra vegetation within the footprint of each tower at the three Imnavait Cr sites.  We sampled from the two most prevelant vegetation types within the flux tower footprint.  Plant above- and below-ground biomass was assessed such that present and past produciton could be calclulated.  We also characterized the soil available N, C/N and thaw depth and other basic parameters.

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Imnavait Creek spring activities -2013

Jun
05

An unusually late, cold spring has delayed snow melt in northern Alaska.  Our site visit this year included re-installing the methane sensor, calibrating and repairing analyzers and communications equipment, all in winter-like conditions despite it being late May.  This will be the second summer of continuous CH4 flux measurement at the Fen moist-acidic tundra site.  The instrument was set up well ahead of the melt, so we hope to get some exciting data.  Our webcams are all online now, and images are still being harvested by the PhenoCam network.

May 23, 2013 Imnavait Cr:

 

May 23, 2013 Imnavait Cr:

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Webcam image archives now available

Apr
26

See our data access page to download archived webcam images from past years.   Currently, these are rather large files for an entire calendar year.  Contact us if you would like a specific date range or have trouble downloading the archives.

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AON data presented at NACP/AmeriFlux meetings

Feb
01

Dr. Eugenie Euskirchen is presenting CO2 and CH4 data summaries from the Imnavait Creek sites at the 2013 AmeriFlux/NACP meetings in Albuquerque, New Mexico.  Her poster is available on our Presentations page, under the Publications menu.

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Phenology Webcams join PhenoCam Network

Nov
12

Images from our four webcams at Imnavait Creek join the PhenoCam network.  This is an effort to improve understanding of vegetation phenology via a network of canopy cameras.  Images from our phenology webcams begin in June 2012 and can now be found in the 'Affiliated sites' section of the PhenoCam website: http://phenocam.sr.unh.edu/webcam/gallery/

Examples from the Ridge Phenocam, including some caribou passing through:

 

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Collaborative study from Imnavait Creek flux sites published

Oct
03

Research examining seasonal and spatial variation in plot-level CO2 fluxes at our flux tower sites will be published in the Journal of Geophysical Research.  Lead author and AON collaborator Dr. Anja Kade classified tundra vegetation types within the 3 flux tower footprints and then measured chamber-level CO2 fluxes in dominant vegetation types during both the growing season and winter months.   Scaling net ecosystem exchange rate of CO2 from plot-level to tower-level produced generally good agreeement between methods during summer, but not during wintertime.  
Read the abstract or download the pdf from our bibiliography page.

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Phenology webcams established

Jul
27

Additional webcam images can now be viewed on this site, click the 'Webcam Gallery' menu item.  We hope to create downloadable archives of images in the future.  In the meantime, please use the 'contact us' link at right to obtain past image files.

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Site visit to Pleistocene Park Russia planned

Jul
24

The project technician will be traveling to Cherskiy in September to assist our Russian colleagues with maintainance, calibration and some repairs to the 35 m eddy tower at Pleistocene Park.   Some damage occurred over the winter and during heavy flooding this spring.  Main items to replace are power supplies, net radiometer and the tower data and power cables.  We will add a second set of flux instruments at a lower height on the tower which will serve to better measure the vertical CO2 gradient and help resolve spatial resolution of the flux data.

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