Name: GHG_Flux_Data_Schema Description: This dataset contains chamber-based measurements of greenhouse gas (GHG) concentrations and derived flux calculations for soil N₂O. Raw concentration data are combined with environmental parameters and chamber geometry to calculate linear and quadratic flux estimates. Classification: RDF401 Author: Michelle Gareau Author Email: gareaum@uoguelph.ca Schema package SAID: ENkZNNH9QYzX3mnk9YQ2s-S2Zx3ONfXTTMG4kofoFpbD
day of year corresponding to the sample date (1 - 366)
sample_id
sample identifier
unique sample entry code (doy-sample_id-timestep)
sample_location
sample location
Experimental location identifier corresponding to the hexagon (hex) and lysimeter
soil_id
soil type
soil classification
start_time
sampling start time
time chambers are closed and the first sample is collected.
end_time
sampling end time
time the chambers are opened and no more samples are collected
time_step_h
time since closure when a sample is collected
Time elapsed since chamber closure (t=0 mins, 7 mins, 14 mins, 21 mins)
time_step_h2
time step sqaured
Squared time step term used for quadratic flux model fitting
co2_ppm
CO2 concentration
Measured carbon dioxide concentration inside the chamber.
n2o_ppm
N2O concentratoin
Measured nitrous oxide concentration inside the chamber.
temperature_c
Air temperature
average air temperature during sampling
pressure_atm
atmospheric pressure
Atmospheric pressure measured during sampling
molar_volume
molar gas volume
Calculated from temperature and pressure using ideal gas law
co2_concentration
CO2 concentraction
COnverted from ppm to mass-based units as carbon equivalents
n2o_concentration
N2O concentration
Converted from ppm to mass-based units as nitrogen equivalents
n2o_linear_flux
N2O linear flux
Flux from linear regression of concentration vs time
n2o_linear_r2
N2O linear R2
Coefficient of determination for linear model
n2o_quadratic_slope
N2O quadratic slope
Instantaneous slope at time zero from quadratic model
n2o_quadratic_r2
N2O quadratic R2
Coefficient of determination for quadratic model
n2o_quadratic_coefficient
N2O quadratic coefficient
Second derivative indicating curvature of concentration–time relationship
n2o_quadratic_flux
N2O quadratic flux
Flux estimated from quadratic model scaled by chamber geometry
fit_selection
Flux fit scheme
Which flux scheme was selected based on R2
International schema information
Language
Name
Description
English
GHG_Flux_Data_Schema
This dataset contains chamber-based measurements of greenhouse gas (GHG) concentrations and derived flux calculations for soil N₂O. Raw concentration data are combined with environmental parameters and chamber geometry to calculate linear and quadratic flux estimates.
Selection lists
English
fit_selection entry codes
Entry code
Label
quadratic
quadratic flux scheme
linear
linear flux scheme
sample_location entry codes
Entry code
Label
H1L1
hex 1 lysimeter 1
H1L2
hex 1 lysimeter 2
H1L3
hex 1 lysimeter 3
H1L4
hex 1 lysimeter 4
H1L5
hex 1 lysimeter 5
H1L6
hex 1 lysimeter 6
H2L1
hex 2 lysimeter 1
H2L2
hex 2 lysimeter 2
H2L3
hex 2 lysimeter 3
H2L4
hex 2 lysimeter 4
H2L5
hex 2 lysimeter 5
H2L6
hex 2 lysimeter 6
H3L1
hex 3 lysimeter 1
H3L2
hex 3 lysimeter 2
H3L3
hex 3 lysimeter 3
H3L4
hex 3 lysimeter 4
H3L5
hex 3 lysimeter 5
H3L6
hex 3 lysimeter 6
soil_id entry codes
Entry code
Label
C
cambridge loamy sand
E
Elora silty loam
Language-independent schema details
Attribute
Sensitive
Unit
Type
Character encoding
Required entry
Format rule
date
false
DateTime
utf-8
true
^(0[1-9]|[12]\d|3[01])/(0[1-9]|1[0-2])/\d{4}$
doy
false
day
Numeric
utf-8
true
^-?[0-9]+$
sample_id
false
Text
utf-8
true
^[A-Za-z]{1,50}$
sample_location
false
Text
utf-8
true
^[A-Za-z]{1,50}$
soil_id
false
Text
utf-8
false
^[A-Za-z]{0,50}$
start_time
false
hours
Numeric
utf-8
true
^[-+]?\d*\.?\d+$
end_time
false
hours
Numeric
utf-8
true
^[-+]?\d*\.?\d+$
time_step_h
false
hours
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
time_step_h2
false
hours^2
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
co2_ppm
false
ppm
Numeric
utf-8
true
^[-+]?\d*\.?\d+$
n2o_ppm
false
ppm
Numeric
utf-8
true
^[-+]?\d*\.?\d+$
temperature_c
false
celcius
Numeric
utf-8
true
^[-+]?\d*\.?\d+$
pressure_atm
false
atm
Numeric
utf-8
true
^[-+]?\d*\.?\d+$
molar_volume
false
m^3 mol^-1
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
co2_concentration
false
ug CO2-C m^-3
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
n2o_concentration
false
ug N2O-N m^-3
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
n2o_linear_flux
false
ug N m^-3 h^-1
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
n2o_linear_r2
false
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
n2o_quadratic_slope
false
ug N m^-3 h^-2
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
n2o_quadratic_r2
false
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
n2o_quadratic_coefficient
false
ug N m^-3 h^-2
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
n2o_quadratic_flux
false
ug N m^-3 h^-1
Numeric
utf-8
false
^[-+]?\d*\.?\d+$
fit_selection
false
Text
utf-8
false
^[A-Za-z]{0,50}$
Unit framing
Term
Value
id
UCUM
label
Unified Code for Units of Measure
location
https://ucum.org/
version
Language-specific schema details
English
Attribute
Label
Description
List
date
date of sampling
date of sampling (mm:dd:yyyy)
Not a list
doy
doy of year
day of year corresponding to the sample date (1 - 366)
Not a list
sample_id
sample identifier
unique sample entry code (doy-sample_id-timestep)
Not a list
sample_location
sample location
Experimental location identifier corresponding to the hexagon (hex) and lysimeter