tang_2003_flux: Internal function to compute surface co2 flux at a given...

In jmzobitz/NEONSoils: Compute Soil Carbon Fluxes for the National Ecological Observatory Network Sites

Internal function to compute surface co2 flux at a given timepoint via Tang et al 2003

Description

Given zOffsets, diffusivity, and co2 (umol mol-1) and their associated errors, compute the surface flux. This is done by computing the gradient of co2 (slope from linear regression) and linear extrapolation of surface diffusivity. Modified from Tang et al (2003).

Usage

tang_2003_flux(zOffset, co2, co2_err, diffusive, diffusive_err)

Arguments

zOffset	Required. depths below surface - assumed to be positive in value. Important for directionality!
co2	Required. co2 at depth (umol m–1)
co2_err	Required. Associated errors with that value of co2
diffusive	Required. diffusivity at each depth
diffusive_err	Required Associated errors with diffusivity

Value

Data frame of fluxes associated error

Author(s)

John Zobitz [e-mail]

References

Tang, Jianwu, Dennis D Baldocchi, Ye Qi, and Liukang Xu. 2003. “Assessing Soil CO2 Efflux Using Continuous Measurements of CO2 Profiles in Soils with Small Solid-State Sensors.” Agricultural and Forest Meteorology 118 (3): 207–20. https://doi.org/10.1016/S0168-1923(03)00112-6.

Maier, M., and H. Schack-Kirchner. 2014. “Using the Gradient Method to Determine Soil Gas Flux: A Review.” Agricultural and Forest Meteorology 192–193 (July):78–95. https://doi.org/10.1016/j.agrformet.2014.03.006.

See Also

[dejong_shappert_flux()], [hirano_flux()], [tang_2005_flux()] for other ways to compute surface fluxes.

jmzobitz/NEONSoils documentation built on May 31, 2024, 12:20 p.m.