#US-Syv Sylvania Wilderness Data - http://ameriflux.ornl.gov/fullsiteinfo.php?sid=58 - http://fluxnet.ornl.gov/site/1008 - http://flux.aos.wisc.edu/twiki/bin/view/Main/ChEASData #Latitude: 46.2420 Longitude:-89.3477 Elevation: 540 m Vegetation: Mixed Forest / Old-growth hardwood (sugar maple and eastern hemlock) #Tower measurement height: 36.6 m Canopy height: 22 m #Data Output On Apr2013 revision: Mon Apr 8 11:42:14 2013 # #Contact Information: Ankur R Desai desai@aos.wisc.edu #Missing or invalid data is reported as -999.0. Data starts on line 116 #Time is recorded at the beginning of average period. The averaging interval is 30 minutes. #Timezone is US Central Standard Time UTC-6 # # Data column Information # 1 Year YYYY # 2 Month MM # 3 Day DDD # 4 Hour Local time (UTC-6) HH.H # 5 Day_Fraction DDD.DDDDDD # 6 Year_Fraction YYYY.YYYYYYYY # 7 NEE_CO2 NEE of CO2 umol m-2 s-1 # 8 LE Latent heat flux (storage corrected) W m-2 # 9 H Sensible heat flux (storage corrected) W m-2 # 10 ustar Preferred friction velocity(a) m s-1 # 11 Tsoil Filled 5cm soil temperature(a) degrees C # 12 PAR Filled photosynthetic active radiation(a) umol m-2 s-1 # 13 Tair Filled air temperature at 36 m(a) degrees C # 14 H2O Preferred water vapor mixing ratio at 36 m(a) g kg-1 # 15 VPD Preferred vapor pressure deficit at 36 m(a) Pa # 16 WS Preferred wind speed at 36 m(a) m s-1 # 17 WDir Preferred wind direction at 36 m(a) degrees # 18 Precipitation Precipitation(a) mm # 19 CO2 Preferred CO2 concentration at 36m(a) ppm # 20 Pressure Air pressure at 36 m not sea-level corrected kPa # 21 C_flag Flag for screening of NEE(b) unitless # 22 Q_flag Flag for LE(b) unitless # 23 H_flag Flag for H(b) unitless # 24 M_flag Flag for ustar(b) unitless # 25 Ustar_36 Non-filled friction velocity at 36 m m s-1 # 26 NEE_CO2_filled Gap filled NEE_CO2(c) umol m-2 s-1 # 27 Reco Ecosystem respiration(c) umol m-2 s-1 # 28 GPP Gross primary production(c) umol m-2 s-1 # 29 NEE_CO2_modeled Modeled NEE(c) umol m-2 s-1 # 30 Storage_CO2 Storage of CO2 at 36 m umol m-2 s-1 # 31 Flux_CO2 Turbulent flux of CO2 at 36 m umol m-2 s-1 # 32 Storage_H2O Storage of H2O at 36 m W m-2 # 33 Flux_H2O Turbulent flux of H2O at 36 m W m-2 # 34 Storage_T Storage of heat at 36 m W m-2 # 35 Flux_T Turbulent flux of heat at 36 m W m-2 # 36 CO2_1 CO2 concentration at 0.6 m ppm # 37 CO2_2 CO2 concentration at 1.8 m ppm # 38 CO2_3 CO2 concentration at 3.0 m ppm # 39 CO2_8 CO2 concentration at 7.6 m ppm # 40 CO2_14 CO2 concentration at 14 m ppm # 41 CO2_21 CO2 concentration at 21 m ppm # 42 CO2_36 CO2 concentration at 36 m ppm # 43 H2O_2 Water vapor mixing ratio at 2 m g kg-1 # 44 H2O_10 Water vapor mixing ratio at 7.6 m g kg-1 # 45 H2O_20 Water vapor mixing ratio at 12.2 m g kg-1 # 46 H2O_36 Water vapor mixing ratio at 36 m g kg-1 # 47 Tair_0_05 Air temperature at 5 cm degrees C # 48 Tair_0_25 Air temperature at 25 cm degrees C # 49 Tair_0_50 Air temperature at 50 cm degrees C # 50 Tair_0_60 Air temperature at 60 cm degrees C # 51 Tair_1 Air temperature at 1 m degrees C # 52 Tair_2 Air temperature at 1.8 m degrees C # 53 Tair_8 Air temperature at 7.6 m degrees C # 54 Tair_10 Air temperature at 10 m degrees C # 55 Tair_15 Air temperature at 15 m degrees C # 56 Tair_20 Air temperature at 20 m degrees C # 57 Tair_23 Air temperature at 23 m degrees C # 58 Tair_30 Air temperature at 30 m degrees C # 59 Tair_36 Air temperature at 36 m degrees C # 60 PAR_1 Photosynthetic active radiation at 1 m umol m-2 s-1 # 61 PAR_6 Photosynthetic active radiation at 6 m umol m-2 s-1 # 62 PAR_12 Photosynthetic active radiation at 12 m umol m-2 s-1 # 63 PAR_36 Photosynthetic active radiation at 36 m umol m-2 s-1 # 64 PAR_Diffuse Diffuse photosynthetic active radiation at 36 m umol m-2 s-1 # 65 NetRad_36 Net radiation at 36 m W m-2 # 66 WS_20 Wind speed at 20 m m s-1 # 67 WS_36 Wind speed at 36 m m s-1 # 68 Wdir_20 Wind direction at 20 m degrees # 69 Wdir_36 Wind direction at 36 m degrees # 70 Tsoil_0 Soil temperature at surface degrees C # 71 Tsoil_0_5 Soil temperature at 5 cm degrees C # 72 Tsoil_0_10 Soil temperature at 10 cm degrees C # 73 Tsoil_0_20 Soil temperature at 20 cm degrees C # 74 Tsoil_0_50 Soil temperature at 50 cm degrees C # 75 Tsoil_1 Soil temperature at 100 cm degrees C # 76 Qsoil_0_5 Soil moisture at 5 cm % VWC # 77 Qsoil_0_10 Soil moisture at 10 cm % VWC # 78 Qsoil_0_20 Soil moisture at 20 cm % VWC # 79 Qsoil_0_50 Soil moisture at 50 cm % VWC # 80 Qsoil_1 Soil moisture at 100 cm % VWC # 81 G Soil heat flux at 75 mm W m-2 # (a) Meteorological products: PAR / Tair / H2O / VPD / Wind Speed / Wind Dir / Precipitation are hybrid products # PAR/Tair/H2O/VPD/Wind Speed/Wind Dir are merged with nearby sensors as noted. No gaps in PAR Tair or Tsoil. Gaps in others are present # PAR: Gaps filled with nearby PAR sensor observations or long-term ensemble average for small gaps # PAR sensors at 1 m in 2001-2003 moved to 6 and 12 m on 28 June 2013 # Tair: 36 m Air temperature combined with nearby observations # H2O: Water vapor mixing ratio combined from Vaisala and Licor sensors and filled where available with NTL LTER Woodruff airport observation # VPD: Vapor pressure deficit derived from H2O/filled air temperature/filled surface air pressure # Windspeed and direction: 36 m wind speed from sonic anemometer and filled where available with Woodruff airport observation # Precipitation: Where available bad data replaced with Watersmeet NWS. Many gaps after 2006 # (b) Flag descriptions of CO2/H/LE: # -1 indicates bad or missing value replaced with -999 # 0 indicates good observation # 1 indicates night ustar less than 0.325 m s-1 (discard data) # 2 indicates daytime 30-90 degree wind direction/lake footprint (discard data as per Desai et al. 2005 AgForMet) # (c) u* is taken from 36m and a linear fit of preferred wind speed at 36 m based on u_star_flag # 1 = ustar at 36 m # 2 = preferred wind speed at 36 m: linearly fit to ustar at 36m (r=0.82) # For the true 36m u* see variable ustar_36 # (d) Gap filled NEE based on Desai et al. 2005 AgForMet moving window regression of filled air temperature and PAR to ustar screened NEE # Reco derived from nighttime NEE and temperature # GPP reported here is the model fit of NEE residual to PAR. For a more data-based GPP used Reco-NEE_Filled # NEE_Model is equal to Reco-GPP year,month,day,hour,day_fraction,year_fraction,nee_co2,le,h,ustar,tsoil,par,tair,h2o,vpd,ws,wdir,precipitation,co2,pressure,c_flag,q_flag,h_flag,m_flag,ustar_36,nee_co2_filled,reco,gpp,nee_co2_modeled,storage_co2,flux_co2,storage_h2o,flux_h2o,storage_t,flux_t,co2_1,co2_2,co2_3,co2_8,co2_14,co2_21,co2_36,h2o_2,h2o_10,h2o_20,h2o_36,tair_0_05,tair_0_25,tair_0_50,tair_0_60,tair_1,tair_2,tair_8,tair_10,tair_15,tair_20,tair_23,tair_30,tair_36,par_1,par_6,par_12,par_36,par_diffuse,netrad_36,ws_20,ws_36,wdir_20,wdir_36,tsoil_0,tsoil_0_5,tsoil_0_10,tsoil_0_20,tsoil_0_50,tsoil_1,qsoil_0_5,qsoil_0_10,qsoil_0_20,qsoil_0_50,qsoil_1,g