AmeriFlux Data and Site Comparison
Project
Timeline
Data Delivery: Mid/End November 1998 to Antoinette Brenkert or Eva Falge
Antoinette L. Brenkert
CDIAC-ESD-ORNL
2825 39th Street NW
Washington DC 20007
ph: (202)-342-5680 or (202)-342-3142
email:
azt@ornl.gov or eyt@bellatlantic.net
Eva Falge
ATDD, NOAA
PO Box 2456
456 S. Illinois Ave
Oak Ridge, TN 37831-2456
ph: (865) 576-2326
fax: (865) 576-1327
email:
falge@atdd.noaa.gov1st Draft: End of December 1998 to all
Workshop: End of January 1999 in Oak Ridge
Participants (so far)
|
Site |
State |
PI |
Ecosystem Type |
|
Walker Branch |
Tennessee |
D Baldocchi |
temperate deciduous forest |
|
Harvard Forest |
Massachusetts |
SC Wofsy, JW Munger |
temperate deciduous forest |
|
WLEF/Park Falls |
Wisconsin |
P Bakwin |
temperate/boreal forest |
|
Howland Forest |
Maine |
DY Hollinger |
boreal coniferous forest |
|
Ponca City |
Oklahoma |
S Verma |
crop (winter wheat) |
|
Shidler |
Oklahoma |
S Verma |
tallgrass prairie |
|
Camp Borden |
Ontario |
J Fuentes |
boreal deciduous forest |
|
Metolius |
Oregon |
M Unsworth, B Law |
temperate coniferous forest |
|
North Boreas |
Manitoba |
SC Wofsy |
boreal coniferous forest |
|
Bondville |
Illinois |
T Meyers |
crop (soybean, corn) |
|
Little Washita |
Oklahoma |
T Meyers |
rangeland |
Key Questions
- Effect of abiotic and biotic factors on C fluxes across a gradient or network
- Construction of defensible sums
- Comparison of responses within and between biomes
- Comparison of responses to environmental factors
- Comparison of seasonal patterns
Data List
0) Climate Summary
|
Units |
Annual |
July |
|
|
Air temperature |
deg. C |
(mean) |
(mean) |
|
Soil temperature |
deg. C |
(mean) |
(mean) |
|
Vapor pressure deficit of the air |
kPa |
(daytime mean) |
(daytime mean) |
|
Net Radiation |
kJ m-2 yr-1 or kJ m-2 month-1 |
(sum) |
(sum) |
|
Precipitation |
mm yr-1 or mm month-1 |
(sum) |
(sum) |
|
LAI (projected) |
m2 m-2 |
(mean) |
(mean) |
1) Diurnal Data
for July 1996 and/or July 1997 and/or peak period
mean daily course and standard deviation (based on 30- or 60-minute values) of
|
Timestep |
Time |
hour (minutes as decimals) |
End time of averaged time interval |
|
Latent heat flux |
LE |
W m-2 |
Rate of vertical transfer of latent from measurements above the canopy (and corrected for latent heat storage in air layer ???) |
|
Net radiation |
Rn |
W m-2 |
Net radiation as difference between the incoming and outgoing total radiation. |
|
Net Ecosystem Exchange |
NEE |
µmol m-2 s-1 |
Rate of vertical transfer of CO2 calculated from measurements above the canopy and corrected for CO2 storage in canopy air layer and CO2 drift (if applicable) |
|
Sensible heat flux |
H |
W m-2 |
Rate of vertical transfer of heat from measurements above the canopy (and corrected for heat storage in air layer and canopy biomass???) |
|
Soil heat flux |
G |
W m-2 |
Averaged soil heat flux density |
|
Photosynthetic Active Radiation |
PAR |
µmol m-2 s-1 |
PAR is the radiation in the 0.4-0.7 m m waveband. |
|
Momentum |
TAU |
m2 s-2 |
Rate of vertical transfer of momentum |
|
Air temperature |
Ta |
degrees C |
Measured above the canopy |
|
Relative humidity |
Rh |
% |
Measured above the canopy |
|
Soil temperature |
Tscm |
degrees C |
Averaged temperature of the soil at different depths (cm for depth) |
|
Precipitation |
P |
mm |
Total precipitation during the observed time period |
2) Daily Sums
Annual course of daily sums of NEE in units of g C m-2 day-1
Gap filling preferably using PAR, and Tair response; for instructions - if needed - see appendix.
3) Responses and Nighttime Fluxes
for two weeks during peak vegetation period and preferred wind direction
30- or 60-minute values of the variables listed under 1) Diurnal Data,
additional variables:
|
Wind direction |
WD |
degrees |
Wind direction clockwise from North |
|
Sky conditions |
Sky |
- |
Indicator for cloudy/clear conditions: 0 (clear) to 1 (cloudy) |