ࡱ> VXU%` Dbjbj"x"x 4H@@w L!,[*hN!N!N!N!N!)")")"b)d)d)d)d)d)d)$+h+.))")")")")")N!N!*%%%)"zN!N!b)%)"b)%%((N!B! /] $"(b)+*0[*(,.$.(.()")"%)")")")")"))% )")")"[*)")")")"  Notes on data Ameriflux sites, Mead, NE August 15, 2008 List of Variables: Variable Units Meaning JD Julian Day Year Calendar Year Month Month of the year Day Day of the month Hour Hour of the day set at midpoint of the hour Dtime Decimal day of the year FC mol m-2 s-1 Carbon Dioxide eddy flux (no U* filtering, no gap filling) FS mol m-2 s-1 Carbon Dioxide storage flux measured from concentration profile UST m s-1 Friction velocity LE W m-2 Latent heat flux (no U* filtering, no gap filling) LE_gap W m-2 Latent heat flux (U* filtered and gap filled) LE_gap flag 0 = measured data; 1 = gap filled H W m-2 Sensible heat flux (no U* filtering, no gap filling) H_gap W m-2 Sensible heat flux (U* filtered, gap filled) H_gap flag 0 = measured data; 1 = gap filled G1 W m-2 Soil heat flux + storage above plates (gap filled) G1 flag 0 = measured data; 1 = gap filled Z_EC m Eddy covariance measurement height (either 3 or 6.2 m) Z_EC flag 0 = measured data; 1 = gap filled CO2_top ppm Carbon dioxide concentration at eddy covariance sensor height CO2_top flag 0 = measured data; 1 = gap filled PAR mol m-2 s-1 Incoming Photosynthetically Active Radiation PAR flag 0 = measured data; 1 = gap filled PAR_OUT mol m-2 s-1 Reflected Photosynthetically Active Radiation PAR_OUT flag 0 = measured data; 1 = gap filled TA oC Air Temperature at eddy covariance sensor height TA flag 0 = measured data; 1 = gap filled RH % Relative humidity at eddy covariance sensor height RH flag 0 = measured data; 1 = gap filled PRECIP mm Precipitation from upper tower rain gauge PRECIP flag 0 = measured data; 1 = gap filled PRECIP2 mm Precipitation from lower tower rain gauge PRECIP2 flag 0 = measured data; 1 = gap filled TS_IR_2 oC Soil temperature at 2 cm depth, in plant row TS_IR_2 flag 0 = measured data; 1 = gap filled TS_IR_4 oC Soil temperature at 4 cm depth, in plant row TS_IR_4 flag 0 = measured data; 1 = gap filled TS_IR_6 oC Soil temperature at 6 cm depth, in plant row TS_IR_6 flag 0 = measured data; 1 = gap filled TS_IR_10 oC Soil temperature at 10 cm depth, in plant row TS_IR_10 flag 0 = measured data; 1 = gap filled TS_BR_2 oC Soil temperature at 2 cm depth, between plant rows TS_BR_2 flag 0 = measured data; 1 = gap filled TS_BR_4 oC Soil temperature at 4 cm depth, between plant rows TS_BR_4 flag 0 = measured data; 1 = gap filled TS_BR_6 oC Soil temperature at 6 cm depth, between plant rows TS_BR_6 flag 0 = measured data; 1 = gap filled TS_BR_10 oC Soil temperature at 10 cm depth, between plant rows TS_BR_10 flag 0 = measured data; 1 = gap filled TS_20 oC Soil temperature at 20 cm depth TS_20 flag 0 = measured data; 1 = gap filled TS_30 oC Soil temperature at 30 cm depth TS_30 flag 0 = measured data; 1 = gap filled TS_50 oC Soil temperature at 50 cm depth TS_50 flag 0 = measured data; 1 = gap filled Rg_in W m-2 Incoming Solar radiation Rg_in flag 0 = measured data; 1 = gap filled Rg_out W m-2 ReflectedSolar radiation Rg_out flag 0 = measured data; 1 = gap filled RNET W m-2 Net radiation RNET flag 0 = measured data; 1 = gap filled PAR_diff mol m-2 s-1 Diffuse photosynthetically active radiation PAR_diff flag 0 = measured data; 1 = gap filled PAR_direct mol m-2 s-1 Direct photosynthetically active radiation PAR_direct flag 0 = measured data; 1 = gap filled FAPAR fraction Fraction of photosynthetically active radiation absorbed FAPAR flag 0 = measured data; 1 = gap filled WD deg Wind direction WD flag 0 = measured data; 1 = gap filled U_EC m s-1 Mean horizontal wind speed at eddy covariance sensor height U_EC flag 0 = measured data; 1 = gap filled PRESS kPa Atmospheric pressure PRESS flag 0 = measured data; 1 = gap filled Z/L Atmospheric stability parameter Z/L flag 0 = measured data; 1 = gap filled NEE mol m-2 s-1 Net ecosystem exchange (no U* filtering, no gap filling) NEE_gap mol m-2 s-1 Net ecosystem exchange (U* filtered, and gap filled) NEE_gap flag 0 = measured data; 1 = gap filled GPP mol m-2 s-1 Gross primary productivity GPP flag 0 = measured data; 1 = gap filled RE mol m-2 s-1 Ecosystem respiration RE flag 0 = measured data; 1 = gap filled Rlong_in W m-2 Incoming longwave radiation Rlong_in flag 0 = measured data; 1 = gap filled Rlong_out W m-2 Outgoing longwave radiation Rlong_out flag 0 = measured data; 1 = gap filled VPD kPa Vapor pressure deficit at eddy covariance sensor height VPD flag 0 = measured data; 1 = gap filled H2O mmol mol-1 Water vapor flux H20 flag 0 = measured data; 1 = gap filled Beginning dates for data: Site 1: 5/27/2006 Site 2: 5/27/2006 Site 3: 5/27/2006 Ending dates for data: Site 1: 5/29/2008 Site 2: 5/29/2008 Site 3: 5/29/2008 Data Flag Columns 0 = original data 1 = missing data (value has been gap filled if correspon')2789:KLMNVXY^`ghinop   # $     8 B J P f l ɽꮳꪦh uhhhhH*hLtEha@hh^ hO6n5h /h^5>* h'>* h'5>*h'h'5>* h^>* h5h /h+m5 h5h /h^5h /hO5 h'56)9:MNhi{ 4 r 6 g  R   gda@gdgd'gd~$a$gd^D 2 < > @ B D F J p x z | ~      5 < = A B C f i j k l n o p         Q T U Y Z [ ~ h uH*h uh uH*h uh% ha@H*hha@H*hLtEha@h ha@hP~ tZ`bjln ,-PTUVWX!()+V]^bcdh uh uH* ha@hhha@H*h uhO6nhLtEha@hT vZ Q!W+]5qVgd ugda@gd+237\defgh  5>?@Aqyz~ !78U]^bcdh# h uh uH*hLtEh uhha@Z<n&R5Qr`-]v?ogdgd u;DEIJntuvwx&,-./0FHQ\]^  5:;<=?@APQZ[\ hLtEh h uH*h uh uH*h uhh# hLtEV pr^`v~,23789]`abeuxy}~#$%(>DEIJKoshO6n hLtEhLtEh uh uH*h uh hLtEhhLtEhha@H*ha@Q">B 5 x !'!:!N!O!P!g!gdgdO6ngd~gdgdgd u  "02:<>>BDFHTX\`@BRT\   4 9 : ; > j h uH*h uh uH* hLtEhhha@H*ha@hLtEh uhRj q w { | ! !!!%!&!0!1!2!3!8!9!D!E!F!H!L!M!O!P!V!g!!!!!"@@@IAA(BCBnBxBBBBBBùhO6nhO6nH*h"chhU hO6n5>*h /h5>* h5>*hh /hO6n5>*h hLtEh h uH*h uh uH*h uhhLtEhO6n?g!{!!!!!!!@i@j@Dgdmgd~gdO6ngd ding datum is not -9999) -9999 = no data available or removed due to sensor calibration/malfunction, etc For example, the column FC is the CO2 eddy flux that has been screened for sensor malfunction, power outages, calibration periods, interruptions in the data collection program, and outrageous values due to weather, etc. Data have not been screened for low windspeed (or U*) or stationarity. The column NEE is the net ecosystem exchange with identical screening as for FC. The NEE_gap column is the NEE data which has been screened for conditions listed above and stationarity, and low nighttime windspeed threshold (2.5 m s-1). Values removed were replaced with gap-filled estimates and the NEE_gap flag set to 1. Similarly for sensible and latent heat fluxes, "H" and "LE" have been screened for sensor malfunction, power outages, calibration periods, interruptions in the data collection program, and outrageous values due to weather, etc.. These data are not screened using stationarity and not gap filled. The columns "H_gap" and "LE_gap" have been screened using stationarity and gap filled (with appropriate flags set to 1). The G1 term does not include terms such as storage in the residue, storage in the canopy, or energy used in photosynthesis. 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