#US-WCr Willow Creek Data - http://ameriflux.ornl.gov/fullsiteinfo.php?sid=101 - http://fluxnet.ornl.gov/site/1102 - http://flux.aos.wisc.edu/twiki/bin/view/Main/ChEASData #Latitude: 45.8060 Longitude: -90.0798 Elevation: 515 m Vegetation: Mixed Forest / Northern Hardwood #Tower measurement height: 29.6 m Canopy height: 24.2 m #Data Output On Jun2018 revision: Thu Jun 7 14:43:05 2018 # #Contact Information: Ankur R Desai desai@aos.wisc.edu #Missing or invalid data is reported as -999.0. Data starts on line 128 #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_30 Friction velocity at 29.6 m (not filled) 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 29.6 m(a) degrees C # 14 H2O Preferred water vapor mixing ratio at 29.6 m(a) g kg-1 # 15 VPD Preferred vapor pressure deficit at 29.6 m(a) Pa # 16 WS Preferred wind speed at 29.6 m(a) m s-1 # 17 WDir Preferred wind direction at 29.6 m(a) degrees # 18 Precipitation Precipitation(a) mm # 19 CO2 Preferred CO2 concentration at 29.6m(a) ppm # 20 Pressure Air pressure at 29.6 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 filled_ustar(b,c) unitless # 25 Ustar_filled Filled friction velocity at 29.6 m(c) 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 29.6 m umol m-2 s-1 # 31 Flux_CO2 Turbulent flux of CO2 at 29.6 m umol m-2 s-1 # 32 Storage_H2O Storage of H2O at 29.6 m W m-2 # 33 Flux_H2O Turbulent flux of H2O at 29.6 m W m-2 # 34 Storage_T Storage of heat at 29.6 m W m-2 # 35 Flux_T Turbulent flux of heat at 29.6 m W m-2 # 36 CO2_1 CO2 concentration at 0.6 m ppm # 37 CO2_2 CO2 concentration at 1.5 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 13.7 m ppm # 41 CO2_21 CO2 concentration at 21.3 m ppm # 42 CO2_30 CO2 concentration at 29.6 m ppm # 43 H2O_2 Water vapor mixing ratio at 2 m g kg-1 # 44 H2O_8 Water vapor mixing ratio at 7.6 m g kg-1 # 45 H2O_12 Water vapor mixing ratio at 12.2 m g kg-1 # 46 H2O_18 Water vapor mixing ratio at 18.3 m g kg-1 # 47 H2O_24 Water vapor mixing ratio at 24.4 m g kg-1 # 48 H2O_30 Water vapor mixing ratio at 29.6 m g kg-1 # 49 Tair_0_25 Air temperature at 25 cm degrees C # 50 Tair_0_50 Air temperature at 50 cm degrees C # 51 Tair_0_75 Air temperature at 75 cm degrees C # 52 Tair_1 Air temperature at 1 m degrees C # 53 Tair_2 Air temperature at 2 m degrees C # 54 Tair_8 Air temperature at 7.6 m degrees C # 55 Tair_12 Air temperature at 12.2 m degrees C # 56 Tair_18 Air temperature at 18.3 m degrees C # 57 Tair_24 Air temperature at 24.4 m degrees C # 58 Tair_30 Air temperature at 29.6 m degrees C # 59 Ttree_N Tree temperature at north side degrees C # 60 Ttree_S Tree temperature at south side degrees C # 61 PAR_2 Photosynthetic active radiation at 2 m umol m-2 s-1 # 62 PAR_6 Photosynthetic active radiation at 6.1 m umol m-2 s-1 # 63 PAR_12 Photosynthetic active radiation at 12.2 m umol m-2 s-1 # 64 PAR_18 Photosynthetic active radiation at 18.3 m umol m-2 s-1 # 65 PAR_30 Photosynthetic active radiation at 29.6 m umol m-2 s-1 # 66 PAR_Diffuse Diffuse photosynthetic active radiation at 29.6 m umol m-2 s-1 # 67 NetRad_2 Net radiation at 2 m W m-2 # 68 NetRad_30 Net radiation at 29.6 m W m-2 # 69 Solar_In Solar incoming at 29.6 m W m-2 # 70 Solar_Out Solar reflected at 29.6 m W m-2 # 71 IR_In Longwave incoming radiation at 29.6 m(a) W m-2 # 72 IR_Out Longwave outgoing radiation at 29.6 m W m-2 # 73 WS_2 Wind speed at 2 m m s-1 # 74 WS_12 Wind speed at 12.2 m m s-1 # 75 WS_24 Wind speed at 24.4 m m s-1 # 76 WS_30 Wind speed at 29.6 m m s-1 # 77 Wdir_2 Wind direction at 2 m degrees # 78 Wdir_12 Wind direction at 12.2 m degrees # 79 Wdir_24 Wind direction at 24.4 m degrees # 80 Wdir_30 Wind direction at 29.6 m degrees # 81 Tsoil_0 Soil temperature at surface degrees C # 82 Tsoil_0_5 Soil temperature at 5 cm degrees C # 83 Tsoil_0_10 Soil temperature at 10 cm degrees C # 84 Tsoil_0_20 Soil temperature at 20 cm degrees C # 85 Tsoil_0_50 Soil temperature at 50 cm degrees C # 86 Tsoil_1 Soil temperature at 100 cm degrees C # 87 Qsoil_0_5 Soil moisture at 5 cm % VWC # 88 Qsoil_0_10 Soil moisture at 10 cm % VWC # 89 Qsoil_0_20 Soil moisture at 20 cm % VWC # 90 Qsoil_0_50 Soil moisture at 50 cm % VWC # 91 Qsoil_1 Soil moisture at 100 cm % VWC # 92 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: PAR sensor degradation fixed by transfer function between mid-day PAR and nearby PAR stations at WLEF and NTL-LTER # Gaps filled with nearby PAR sensor observations or long-term ensemble average for small gaps # Tair: 30 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: 30 m wind speed from sonic anemometer and filled where available with WLEF # Precipitation: Where available gaps filled with NTL LTER Woodruff airport observation # (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 0.3 m s-1 (discard data) # 2 indicates anamolous nighttime SE wind direction (discard data as per Cook et al. 2004 AgForMet) # 3 indicates conditions 1 and 2 (discard data) # (c) u* is taken from 30m and a linear fit of preferred wind speed at 30 m based on u_star_flag # 1 = ustar at 30 m # 2 = preferred wind speed at 30 m: linearly fit to ustar at 30m (r=0.84) # For the true 30m u* see variable ustar_30 # (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_30,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_30,h2o_2,h2o_8,h2o_12,h2o_18,h2o_24,h2o_30,tair_0_25,tair_0_50,tair_0_75,tair_1,tair_2,tair_8,tair_12,tair_18,tair_24,tair_30,ttree_n,ttree_s,par_2,par_6,par_12,par_18,par_30,par_diffuse,netrad_2,netrad_30,solar_in,solar_out,ir_in,ir_out,ws_2,ws_12,ws_24,ws_30,wdir_2,wdir_12,wdir_24,wdir_30,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