2015 data now available


After some delay this year there are now data posted from Imnavait Cr.  The Tussock site has fluxes beginning in April due to technical difficulties.  We are working to add the Jan-Apr period from that site at some point in the summer.

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Site visit report - Cherskiy 2014


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


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


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


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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