Study site Thompson, Manitoba Hub of the North Succession following wildfire in black spruce Of forest patches in different successional Spruce between BOREAS NSA and Churchill in 1994īOREAS-Northern Study Area Fire history- TM Julyįire maintains boreal landscape as spatial mosaic Lightning-induced fire in a stand of black (19 global total) 471 Gt C in soil organicįire plays an integral role in boreal forest Work Guo-Yue Niu, Liang Yang Jackson Schoolġ3.8 million km2 between 46ºN and 66 ºN 8-10Įarths terrestrial surface 88 Gt C in biomass Mainies, USGS-Menlo Park Hugo Veldhuis, Pascal How carbon cycling and energy balance in borealĬollaboration with Michael Goulden, Greg Winston,Īndrew McMilaan UC-Irvine Sue Trumbore, ClaudiaĬzimczik, UC-Irvine Jennifer Harden, Kristen -soil carbon, soil microclimate, soil respiration.-physiological measures of ecosystem component.Upwelling), PAR, air temperature, relative (net radiation, solar radiation (incoming,.-NEE carbon, water, energy open-path eddy.Open grassland, transition site, closed canopy.Related to growth, primary production, water Surface process models (CLM2 Liang Yang, UT) Provide objective data for validation of land.Potential groundwater recharge associated with Determine change in ET, energy balance and.That determine gains/losses of carbon from key With woody encroachment and analyze the variables Determine sink strength for carbon associated.Location and geographical extent ofĮxtensive areas of Edwards Plateau historically Roberto Gutierrez, Amy Neuenschwander, UT Freemanįigure 1. James Kjelgaard, Texas AM Melba Crawford, Mesquite on carbon and water cycling in centralĬollaboration with James Heilman, Kevin McInnes, Impact of encroachment of Ashe juniper and Honey Horizontal concentration gradients may also lead Vegetation is homogeneous and it is situated onįlat terrain for an extended distance upwind. Humidity, CO2) are steady, the underlying The atmospheric conditions (wind, temperature, The eddy covariance method is most accurate when.Great tool to look at ecosystem physiology.Fluxes are determined without disturbing the.Measurements are continuous and in high temporal.Inherently averages small-scale variability ofįluxes over a surface area that increaes with.Specific heat of air at constant pressure (J kg-1įluctuation about the mean of air temperatureĬhallenges of operating eddy flux systems in
G of entity transferred vertically, per squareįluctuation about the mean of vertical windįluctuation about the mean of density of water Measured in m s-1 and at a concentration of g Resultvertical speed of transfer of entity Of m s-1, by the fluctuation of the entitiy about With single primed entity b) remove termsĪverage vertical flux of entity over 30 minuteįluctuation of entity about its mean g kg air-1Īt any given instant, multiply velocity ofĪir being moved upwards or downwards at a speed ? Vertical velocity w Volumetric content ?ġ) Expand 2) Simplify a) remove all terms
Propterties carried by eddies Mass, density Directly measure flux by sensing properties ofĮddies as they pass through a measurement levelĪll atmospheric entities show short-periodįluctuations about their long term mean value.Measurement of vertical transfer of water vapor.A years worth of half-hour data can be summed toĭetermine how much Carbon the ecosystem gained or.Indicates the net uptake of CO2 (photosynthesis) The surface (respiration) and a negative flux A positive flux indicates a net loss of CO2 from.The net CO2 flux is calculated for each half hourįrom the measurements of vertical wind and CO2.Link changes in CO2 or H2O in the air above aĬanopy with the upward or downward movement of Or H2O vapor blows in or out of a site in wind Change in water content of volume of soilĬan directly measure each of these variablesĮddy Covariance Directly measure how much CO2