#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 Feb2014 revision: Mon Feb  3 14:30:52 2014
#
#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                 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 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 ustar(b)                                   unitless
# 25 Ustar_30              Non-filled friction velocity at 29.6 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 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 Woodruff airport observation
#     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
