Duke Forest Ameriflux sites:

PP - Pine Plantation
HW - Hardwood Forest
OF - Old Field (grass site)

Located at the Blackwood division of Duke Forest, near Durham, NC (35° 58' 41.430"N, 79° 05' 39.087" W, 163 m asl. The local standard time is UTC - 5.

Instrument height:

PP - 20.2 m
HW - 39.8 m
OF - 2.8 m

The 2003 - 2005 data files include the following:

Core Ameriflux data:

- Date & Time

Year
Julian day
Time (hours) - indicates the beginning of each 30-minute sampling period

- Flux and Radiation Measurements
Fc (mg/m2*s) - CO2 flux
Sc (mg/m2*s) - carbon storage in canopy
NEE (mg/m2*s) - cet ecosystem exchange
Fh2o (mg/m2*s) - water vapor flux
[CO2] (mg/m3) - atmospheric CO2 concentration

- Micrometeorological Measurements

Rn (W/m2) - net radiation
LE (W/m2) - latent heat flux
H (W/m2) - sensible heat flux
Sh (W/m2) - heat storage in canopy
U* (m/s) - friction velocity
PAR (mmol/m2*s) - photosynthetically active radiation
Rg (W/m2) - global solar radiation - measured since 2004
Ta (deg C) - air temperature at instrument height
Rh (abs.) - relative humidity
Ws (m/s) - wind speed
Wd (deg) - wind direction 
PREC (mm) - precipitation
PRESS (kPa) - barometric pressure
Ts (deg C) - soil temperature, measured as follows:
	- PP
		Ts_30_1	- at 30 cm depth #1
		Ts_30_2	- at 30 cm depth #2
		Ts_30_3	- at 30 cm depth #3
		Ts_30_4	- at 30 cm depth #4
		Ts_10_1	- at 10 cm depth #4
		Ts_10_2	- at 10 cm depth #4
		Ts_10_3	- at 10 cm depth #4
		Ts_10_4	- at 10 cm depth #4
	- HW
		Ts_10_n - at 10 cm depth #1
		Ts_25_N - at 25 cm depth #1
		Ts_10_E - at 10 cm depth #2
		Ts_10_S - at 10 cm depth #3
		Ts_25_S - at 25 cm depth #2
		Ts_10_W - at 10 cm depth #4
	-OF
		st n 10 - at 10 cm depth #1
		st n25 - at 25 cm depth #1
		st e10 - at 10 cm depth #2
		st s10 - at 10 cm depth #3
		st s 25 - at 25 cm depth #2
		st w10 - at 10 cm depth #4
SWC (abs.) - soil water content, measured as follows:
	- PP
		SWC_0-30_1 - averaged 0-30 cm #1
		SWC_0-30_2 - averaged 0-30 cm #2
		SWC_0-30_3 - averaged 0-30 cm #3
		SWC_0-30_4 - averaged 0-30 cm #4
	- HW
		SWC_N_20-25_E - 20-25 cm depth #1
		SWC_E_ 5-10_E - 5-10 cm depth #1
		SWC_S_20-25_E - 20-25 cm depth #2
		SWC_W_5-10_E - 5-10 cm depth #2
		SWC_N_5-10_W - 5-10 cm depth #3
		SWC_N_20-25_W - 20-25 cm depth #3
		SWC_S_5-10_W - 5-10 cm depth #4
		SWC_S_20-25_W - 20-25 cm depth #4
		SWC_N_5-10_T - 5-10 cm depth #5
		SWC_N_20-25_T - 20-25 cm depth #5
		SWC_E_5-10_T - 5-10 cm depth #6
		SWC_S_20-25_T - 20-25 cm depth #6
	- OF
		SWC1 - 0-30 cm averaged
		SWC2 - 10 cm depth #1
		SWC3 - 25 cm depth #1
		SWC4 - 10 cm depth #2
		SWC5 - 10 cm depth #3
		SWC6 - 25 cm depth #2
		SWC7 - 10 cm depth #4
		
Additional data:

GEP (mgC/m2*s) - estimated canopy photosynthesis
RE (mgC/m2*s) - estimated ecosystem respiration
ET (mm) - evapotranspiration
Swup (W/m2) - shortwave radiation from above - measured since 2004
SWdn (W/m2) - shortwave radiation from below - measured since 2004
Lwup (W/m2) - longwave radiation from above - measured since 2004
LWdn (W/m2) - longwave radiation from below - measured since 2004
Ta66 (deg C) - air temperature at 2/3 instrument height - PP amd HW only
VPD66 (kPa) - vapor pressure deficit at 2/3 instrument height - PP amd HW only
VPDtop (kPa) - vapor pressure deficit at instrument height
Zenith (deg) - solar zenith angle (calculated)
Fcgpf (boolean) - Fc gapfill indicator (1 for data, 0 for gapfilled)
Hgpf (boolean)  - H, U* and WS gapfill indicator (1 for data, 0 for gapfilled)
Legpf (boolean)  - LE gapfill indicator (1 for data, 0 for gapfilled)