Arctic Tundra Flux Study in the Kuparuk River Basin (Alaska), 1994-1996

Chapin et al. 1994-1996 eddy flux data

Contact: Joe McFadden, email: mcfadden@umn.edu

Tab-delimited ASCII text file comprising 28 columns, described below from left to right.
File has a single header line with the field names.

Missing data are indicated by the string -999

Except as noted, quantities were measured at the height of the tower
instruments (varies with site, (z-d) = approx. 2 m at most locations).

site_id		yyyyss (year followed by 2-digit site number)
veg_type	text field identifying broad vegetation class
obs_date	yyyymmdd local time (Alaska Daylight Time; ADT; UTC-8)
hour	decimal hours, local time (Alaska Daylight Time; ADT; UTC-8)
doy	day of year, local time (Alaska Daylight Time; ADT; UTC-8)
Rg30	global radiation, W m-2 [LI-200SA]
Rn30	net radiation, W m-2 [REBS Q7.1]
H30	sensible heat flux density, W m-2 [ATI SWS-211/3V, SAT-211/3Vx]
LE30	latent heat flux density, W m-2 [LI-6262]
G30	ground heat flux density, W m-2 [REBS HFT-3.1]
dQ30	energy balance clusure error, percent of Rn
LEeq	equilibrium evaporation rate, W m-2
E30	surface evaporation rate, mg m-2 s-1
Ga30	surface aerodynamic conductance, mm s-1
Gs30	surface conductance to water vapor tranfer, mm s-1
Fc30	CO2-C mass flux density, mg C m-2 s-1 [LI-6262]
PPFD30	photosynthetic photon flux density, umol m-2 s-1 [LI-190SA]
D30	water vapor saturation specific humidity deficit, g kg-1
Rh30	relative humidity, percent [Vaisala HMP35C]
Pa30	barometric pressure, hPa [Met One 091]
Ta30	air temperature, deg C [HMP35C]
Tscm5	soil temperature 0-5 cm , deg C [REBS STP-1]
Tacm1	air temperature, near-surface (1 cm) , deg C [other]
ZL30	Monin-Obukhov stability parameter, dimensionless
z0	aerodynamic roughness length, m
Ust	friction velocity, m s-1
WS30	mean streamwise wind velocity, m s-1 [sonic]
WD30	degrees from true North (0-360) [sonic]
windflag	quality-control flag for wind direction, documenting periods 
	with wind flow from behing the instrument array or from the
	location of the electric generator (0=bad, 1=good)