#US-PFa WLEF Very Tall Tower Data - http://ameriflux.ornl.gov/fullsiteinfo.php?sid=100 - http://fluxnet.ornl.gov/site/1036 - http://flux.aos.wisc.edu/twiki/bin/view/Main/ChEASData #Latitude: 45.9459 Longitude: -90.2723 Elevation: 470 m Vegetation: Mixed Forest / Wetland #Data Harmonization Processed On Jun2013 revision: Fri Jun 14 10:15:10 2013 #Contact Information: Ankur R Desai desai@aos.wisc.edu #Missing or invalid data is reported as -999.0. Data starts on line 126 #Time is recorded at the beginning of average period. The averaging interval is 60 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 # 5 Day_Fraction DDD.DDDDDD # 6 Year_Fraction YYYY.YYYYYYYY # 7 NEE_CO2 Preferred NEE of CO2(a) umol m-2 s-1 # 8 LE Preferred Latent heat flux(a) W m-2 # 9 H Preferred Sensible heat flux(a) W m-2 # 10 ustar Preferred u_star(b) m s-1 # 11 NEE_CH4 NEE of CH4 at 122 m (WPL-corrected) nmol m-2 s-1 # 12 PAR Incoming photosynthetic active radiation(c) umol m-2 s-1 # 13 Tair Preferred air temperature at 30 m(c) degrees C # 14 H2O Preferred water vapor mixing ratio at 30 m(c) g kg-1 # 15 VPD Preferred vapor pressure deficit at 30m(c) Pa # 16 WS Preferred wind speed at 30m(c) m s-1 # 17 WDir Preferred wind direction at 30m(c) degrees # 18 Precipitation Precipitation (c) mm # 19 Soil_moist_VWC Near surface soil moisture by volume(c) fraction # 20 Pressure Surface air pressure not sea-level corrected kPa # 21 C_flag Flag for NEE_CO2(d) unitless # 22 Q_flag Flag for LE(d) unitless # 23 H_flag Flag for H(d) unitless # 24 M_flag Flag for ustar(d) unitless # 25 CH4_flag Flag for NEE_CH4(d) unitless # 26 NEE_CO2_filled Gap filled NEE_CO2(e) umol m-2 s-1 # 27 Reco Ecosystem respiration(e) umol m-2 s-1 # 28 GPP Gross primary production(e) umol m-2 s-1 # 29 NEE_CO2_modeled Modeled NEE(e) umol m-2 s-1 # 30 Storage_CO2_30 Storage of CO2 at 30 m umol m-2 s-1 # 31 Storage_CO2_122 Storage of CO2 at 122 m umol m-2 s-1 # 32 Storage_CO2_396 Storage of CO2 at 396 m umol m-2 s-1 # 33 Flux_CO2_30 Turbulent flux of CO2 at 30 m umol m-2 s-1 # 34 Flux_CO2_122 Turbluent flux of CO2 at 122 m umol m-2 s-1 # 35 Flux_CO2_396 Turbulent flux of CO2 at 396 m umol m-2 s-1 # 36 NEE_CO2_30 Net ecosystem exchange of CO2 at 30 m umol m-2 s-1 # 37 NEE_CO2_122 Net ecosystem exchange of CO2 at 122 m umol m-2 s-1 # 38 NEE_CO2_396 Net ecosystem exchange of CO2 at 396 m umol m-2 s-1 # 39 Storage_H2O_30 Storage of H2O at 30 m W m-2 # 40 Storage_H2O_122 Storage of H2O at 122 m W m-2 # 41 Storage_H2O_396 Storage of H2O at 396 m W m-2 # 42 Flux_H2O_30 Turbulent flux of H2O at 30 m W m-2 # 43 Flux_H2O_122 Turbluent flux of H2O at 122 m W m-2 # 44 Flux_H2O_396 Turbulent flux of H2O at 396 m W m-2 # 45 LE_30 Net ecosystem exchange of H2O at 30 m W m-2 # 46 LE_122 Net ecosystem exchange of H2O at 122 m W m-2 # 47 LE_396 Net ecosystem exchange of H2O at 396 m W m-2 # 48 Storage_T_30 Storage of heat at 30 m W m-2 # 49 Storage_T_122 Storage of heat at 122 m W m-2 # 50 Storage_T_396 Storage of heat at 396 m W m-2 # 51 Flux_T_30 Turbulent flux of heat at 30 m W m-2 # 52 Flux_T_122 Turbluent flux of heat at 122 m W m-2 # 53 Flux_T_396 Turbulent flux of heat at 396 m W m-2 # 54 H_30 Net ecosystem exchange of heat at 30 m W m-2 # 55 H_122 Net ecosystem exchange of heat at 122 m W m-2 # 56 H_396 Net ecosystem exchange of heat at 396 m W m-2 # 57 Ustar_30 Friction velocity at 30 m m s-1 # 58 Ustar_122 Friction velocity at 122 m m s-1 # 59 Ustar_396 Friction velocity at 396 m m s-1 # 60 Storage_CH4_122 Storage of CH4 at 122 m nmol m-s s-1 # 61 Flux_CH4_122 Turbulent flux of CH4 at 122 m nmol m-s s-1 # 62 CO2_11 CO2 concentration at 11 m(f) ppm # 63 CO2_30 CO2 concentration at 30 m(f) ppm # 64 CO2_76 CO2 concentration at 76 m(f) ppm # 65 CO2_122 CO2 concentration at 122 m(f) ppm # 66 CO2_244 CO2 concentration at 244 m(f) ppm # 67 CO2_396 CO2 concentration at 396 m(f) ppm # 68 CH4_30 CH4 concentration at 30 m(f) ppm # 69 CH4_122 CH4 concentration at 122 m(f) ppm # 70 CH4_396 CH4 concentration at 396 m(f) ppm # 71 Tair_30 Air temperature at 30 m degrees C # 72 Tair_122 Air temperature at 122 m degrees C # 73 Tair_396 Air temperature at 396 m degrees C # 74 H2O_30 Water vapor mixing ratio at 30 m g kg-1 # 75 H2O_122 Water vapor mixing ratio at 122 m g kg-1 # 76 H2O_396 Water vapor mixing ratio at 396 m g kg-1 # 77 WS_30 Wind speed at 30 m m s-1 # 78 WS_122 Wind speed at 122 m m s-1 # 79 WS_396 Wind speed at 396 m m s-1 # 80 Wdir_30 Wind direction at 30 m degrees # 81 Wdir_122 Wind direction at 122 m degrees # 82 Wdir_396 Wind direction at 396 m degrees # # NOTES # (a) Preferred products based on combination of 3 flux levels as described in Davis et al. 2003 Global Change Biol # Briefly: < 100 W/m2 (stable): prefer 30 m over 122 m over 396 m # > 100 W/m2 (unstable): prefer combined 122/396 m over 396 m over 122m over 30 m # Low u* are not removed; see flags(c) for indication of low u* value # (b) u* is taken from 30m and a linear fit of u* at 122m or preferred wind speed at 30 m based on u_star_flag # 1 = ustar at 30 m # 2 = ustar at 122 m: linearly fit to ustar at 30m (r=0.86) # 3 = preferred wind speed at 30 m: linearly fit to ustar at 30m (r=0.8) # For the true 30m u* see variable Ustar_30 # (c) Meteorological products: PAR / Tair / H2O / VPD / Wind Speed / Wind Dir / Precipitation / Soil Moisture are hybrid products # PAR/Tair/H2O/VPD/Wind Speed/Wind Dir are merged with nearby sensors as noted. No gaps in PAR or Tair. Gaps in others are present # PAR: PAR sensor degradation fixed by transfer function between mid-day PAR and nearby PAR stations at Willow Creek 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 linear fits to 122 m air temperature and 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 # Soil Moisture: 1996-2001 from Willow Spring forest micromet site in WLEF footprint and 2011- from COSMOS neutron probe located at tower # (d) Flag descriptions for CO2/LE/H/CH4: # -1 indicates bad or missing value replaced with -999 # Positive number indicates the sensor height in meters that is used. 244 indicates combination of 396 and 122 m. # Negative number smaller than -1 indicates that flux value from this height should not be used because filled u* at 30 m < 0.2 m s-1 # (e) 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 # (f) CO2 concentration profile from NOAA tall tower observatory. 11/76/244 m went offline in middle of 2009 # CH4 concentration and fluxes started in mid-2010. Concentration from Los Gatos inline with NOAA combined with Picarro # Fluxes from Picarro fast analyzer in trailer # year,month,day,hour,day_fraction,year_fraction,nee_co2,le,h,ustar,nee_ch4,par,tair,h2o,vpd,ws,wdir,precipitation,soil_moist_vwc,pressure,c_flag,q_flag,h_flag,m_flag,ch4_flag,nee_co2_filled,reco,gpp,nee_co2_modeled,storage_co2_30,storage_co2_122,storage_co2_396,flux_co2_30,flux_co2_122,flux_co2_396,NEE_CO2_30,NEE_CO2_122,NEE_CO2_396,storage_q_30,storage_q_122,storage_q_396,flux_q_30,flux_q_122,flux_q_396,le_30,le_122,le_396,storage_t_30,storage_t_122,storage_t_396,flux_t_30,flux_t_122,flux_t_396,h_30,h_122,h_396,ustar_30,ustar_122,ustar_396,storage_ch4_122,flux_ch4_122,CO2_11,CO2_30,CO2_76,CO2_122,CO2_244,CO2_396,CH4_30,CH4_122,CH4_396,Tair_30,Tair_122,Tair_396,Q_30,Q_122,Q_396,WS_30,WS_122,WS_396,Wdir_30,Wdir_122,Wdir_396