uid=ARC,o=lter,dc=ecoinformatics,dc=org all public read 2010ARFluxUnburned.3 Arctic LTER Program Gus Shaver

MBL 7 MBL St. Woods Hole MA 02543 USA

Arctic LTER Program Adrian Rocha

MBL 7 MBL St. Woods Hole MA 02543 USA

Arctic LTER Program

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ 2011 We deployed three eddy covariance towers along a burn severity gradient (i.e. severely-, moderately-, and un-burned tundra) to monitor post fire Net Ecosystem Exchange of CO2 (NEE) within the large 2007 Anaktuvuk River fire scar during the summer of 2008. This data represents the 2010 post fire energy and mass exchange at the unburned site. NEE Energy and Mass Exchange Anaktuvuk River fire AON disturbance Eddy flux Acceptance and utilization of LTER data requires that: The Principal Investigator be sent a notice stating reasons for acquiring any data and a description of the publication intentions. The Principal Investigator of the data set be sent a copy of the report or manuscript prior to submission and be adequately cited in any resultant publications A copy of any resultant publications should be sent to: Principal Investigator Ecosystems Center Marine Biological Laboratory Woods Hole, MA 02543 http://ecosystems.mbl.edu/ARC/meta_template.php?FileName=./burn/terrestrial/xlsfiles/2010ARFluxUnburned.html Unburned flux tower site Anaktuvuk River burn, North Slope, Alaska -150.27 -150.27 68.93 68.93 2010-01-01 2010-12-31 Data collection and processing complete Version 1, May 2011: Initial data release. Version 2: Metadata updated form to newer version (with sites sheet). CH March 2013. Version 3: Metadata repaired - surface temperature is in Kelvin degrees Data Manager

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ ARC LTER

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_im@mbl.edu http://ecosystems.mbl.edu/ARC/ We deployed three eddy covariance towers with identical instrumentation across a burn severity gradient (Rocha and Shaver 2009). The three sites (i.e. Severe burn, Moderate burn, and Unburned) were 40 km to the west of the nearest road and were selected during a helicopter survey of the southern area of the Anaktuvuk River Fire scar in late May 2008 (Figure 1; Table 1). Because the fire had burned through September of the previous year, initial deployment of flux towers occurred prior to any significant vegetative regrowth, and our sampling campaign captured the full 2008 growing season (June 1-August 28). Each site was equipped with a Campbell Scientific® CR5000 datalogger that recorded data from micrometeorological instrumentation located on a stainless steel tripod (CM110; Campbell Scientific; Logan Utah, USA) at a height of 2.6 m. Data were stored on a 2 Gb PCMCIA card and downloaded every two to three weeks. Power for the datalogger and instrumentation was located 15 m to the east or west of the tower and consisted of a south-facing solar panel and two 12 V 80 amp-hour batteries enclosed in a polyethylene box. Towers ran continuously through the summer of 2008 with the exception of the severe burn site, which was damaged by a bear during the last week of August. The towers have been in operation since June 2008. Environmental data were recorded as half hour averages. Net radiation was monitored with a NRLITE net radiometer (Campbell Scientific; Logan Utah, USA). Incoming and reflected solar and longwave radiation were measured with a CNR-1 Radiometer (Campbell Scientific; Logan Utah, USA), while incoming and reflected Photosynthetically Active Radiation (PAR) were measured with a silicon quantum sensor (LI-COR; Lincoln, NE, USA). Air temperature and relative humidity was measured with an HMP45C-L sensor (Campbell Scientific; Logan Utah, USA) enclosed in a naturally aspirated radiation shield, while precipitation was measured with a tipping bucket rain gauge (TE525; Campbell Scientific; Logan Utah, USA). Volumetric water content at a depth of 2.5 cm was measured with two reflectometers (CS616; Campbell Scientfic; Logan Utah, USA), soil temperature at a depth of 2 and 6 cm was measured with two averaging soil thermocouples (TCAV-L; Campbell Scientific; Logan, Utah, USA), and soil heat flux at a depth of 8 cm was measured with four soil heat flux plates (HFP01; Campbell Scientific; Logan, Utah, USA). Measurements of the soil environment were recorded on separate CR1000 dataloggers at the severely and moderately burned sites. Turbulent fluxes of momentum, sensible heat, latent heat and CO2 were determined by the eddy covariance technique (Baldocchi et al. 1988). Half hourly CO2 and H2O fluxes were calculated as the covariance between the turbulent departures from the mean of the 10 Hz vertical wind speed measured with a 3D sonic anemometer (CSAT3; Campbell Scientific; Logan, Utah, USA) and the CO2 and H2O mixing ratio measured with an open path InfraRed Gas Analyzer (IRGA; LI7500; LI-COR; Lincoln, NE, USA). Fluxes were processed using EdiRe software (University of Edinburgh; Moncrieff et al. 1997) and reported using the meteorological sign convention where negative NEE indicates carbon uptake and positive NEE indicates carbon loss from the ecosystem. Ten Hz data were despiked, rotated to the mean wind streamlines, and corrected for the density effect due to sensible heat transfer (i.e. WPL correction; Webb et al. 1980). Turbulent fluxes of sensible and latent heat captured 78 to 80% of the available energy at each of the sites, which is consistent with energy budget closure observed for other eddy covariance studies (Wilson et al. 2002). The unburned site consists of a tussock tundra vegetation community with 40% of the ground covered with Sphagnum and feather mosses, and the remaining ground cover was composed of Tussocks, Cloudberry, Labrador Tea, Cranberry and dwarf birch [Betula nana L.]. References: Rocha, A.V. and G.R. Shaver (2009) Advantages of a two band EVI derived from solar and photosynthetically active radiation fluxes. Agricultural and Forest Meteorology. 149:1560-1563, doi:10.1016/j.agrformet.2009.03.016. Rocha, A.V. and G.R. Shaver (2011) Burn severity influences post-fire CO2 exchange in arctic tundra. Ecological Applications. 21:477-489. Rocha, A.V. and G.R. Shaver (2011) Postfire energy exchange in arctic tundra: the importance and climatic implications of burn severity. Global Change Biology. doi:10.1111/j.1365-2486.2011.02441.x. pers-1 See Methods Gus Shaver

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 gshaver@mbl.edu Lead PI Jim Laundre

The Ecosystems Center Marine Biological Lab 7 MBL St Woods Hole MA 02543 USA

(508) 289 7496 arc_imr@mbl.edu Information Manager The goal of Arctic LTER project is to predict the future ecological characteristics of the site based upon our knowledge of the controls of ecosystem structure and function as exerted by physical setting and geologic factors, climatic factors, biotic factors, and the changes in fluxes of water and materials from land to water. To achieve this goal the Arctic LTER uses several approaches: Long-term monitoring and surveys of natural variation of ecosystem characteristics in space and time. Includes: climate, plant communities and productivity, thaw depth, stream flow, chemistry of streams and lakes, temperatures of streams and lakes, lake chlorophyll lake productivity, zooplankton abundance. Experimental manipulation of ecosystems for years and decades. Includes: tundra warming, shading, and fertilizing, grazer exclusions, fertilization of lakes and streams, addition and subtraction of predators. Synthesis of results and predictive modeling at ecosystem and watershed scales. Includes: stream N cycling, lake physics, bioenergetics of fish populations, water movement and transfer of DOC and nutrients from land to water, soil respiration, cycling and storage of C in tundra under different scenarios of future climates. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The Arctic LTER research site (68°N and 149°W) is in the foothills region of the North Slope of Alaska and includes the entire Toolik Lake watershed and the adjacent watershed of the upper Kuparuk River, down to the confluence of these two watersheds. This area is typical of the northern foothills of the Brooks Range, with continuous permafrost, no trees, a complete snow cover for 7 to 9 months, winter ice cover on lakes, streams, and ocean, and cessation of river flow during the winter. Tussock tundra vegetation of sedges and grasses mixed with dwarf birch and low willows form the dominant vegetation type with areas of drier heath tundra on ridge tops and other well-drained sites as well as areas of river-bottom willow communities. -149.75 -149.0433 68.8 68.5 610 1360 meter 2010ARFluxUnburned.csv Anaktuvuk River Burn Eddy Flux Measurements, 2010 Unburned Site, North Slope Alaska 2010ARFluxUnburned.csv 1 \r\n column , " http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10120&urlTail=burn/terrestrial/data/2010ARFluxUnburned.csv Year Year Year number real NAN Missing or Not Measured DOY DOY Unitless Fractional Day of Year from January 1, 2008 number real NAN Missing or Not Measured Pressure Pressure Atmospheric pressure kilopascal real NAN Missing or Not Measured Air Temperature Air Temperature Air temperature at 2.6m celsius real NAN Missing or Not Measured Surface Temperature (Apogee) Surface Temperature (Apogee) Kelvin degrees at surface kelvin real NAN Missing or Not Measured Soil Temperature Soil Temperature Soil Temperature-Average of 2cm and 6cm measurements celsius real NAN Missing or Not Measured Ambient Vapor Pressure Ambient Vapor Pressure Ambient Vapor Pressure kilopascal real NAN Missing or Not Measured Incoming Shortwave Incoming Shortwave Incoming Shortwave wattPerMeterSquared real NAN Missing or Not Measured Outgoing Shortwave Outgoing Shortwave Outgoing Shortwave wattPerMeterSquared real NAN Missing or Not Measured Incoming Longwave Incoming Longwave Incoming Longwave micromolePerMeterSquaredPerSecond real NAN Missing or Not Measured Outgoing Longwave Outgoing Longwave Outgoing Longwave micromolePerMeterSquaredPerSecond real NAN Missing or Not Measured Net Radiation Net Radiation Net Radiation wattPerMeterSquared real NAN Missing or Not Measured Incoming PAR Incoming PAR Incoming photosynthetically active radiation micromolePerMeterSquaredPerSecond real NAN Missing or Not Measured Outgoing PAR Outgoing PAR Outgoing photosynthetically active radiation micromolePerMeterSquaredPerSecond real NAN Missing or Not Measured IRGA AGC IRGA AGC Count of IRGA AGC flag number real NAN Missing or Not Measured Friction Velocity Friction Velocity Calculated friction velocity meterSquaredPerSecond real NAN Missing or Not Measured Wind Direction Wind Direction Sonic pointed North degree real NAN Missing or Not Measured Wind Speed Wind Speed Wind Speed meterPerSecond real NAN Missing or Not Measured Latent Heat Flux Latent Heat Flux Latent Heat Flux wattPerMeterSquared real NAN Missing or Not Measured Sensible Heat Flux Sensible Heat Flux Sensible Heat Flux wattPerMeterSquared real NAN Missing or Not Measured Ground Heat Flux Ground Heat Flux Ground Heat Flux wattPerMeterSquared real NAN Missing or Not Measured Net Ecosystem Exchange of CO2 Net Ecosystem Exchange of CO2 Net Ecosystem Exchange of CO2 micromolePerMeterSquaredPerSecond real NAN Missing or Not Measured 17520 2010ARFluxUnburned.xls An excel file that has worksheets with the metadata and data. 2010ARFluxUnburned.xls Microsoft Excel http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.10120&urlTail=burn/terrestrial/xlsfiles/2010ARFluxUnburned.xls Microsoft Excel file irradiance unit micro Einsteins (1E-06 moles of photons) per square meter per second (radiant flux density) meters squared per second meters per second