acquire_neon_data       Acquire NEON data for processing
check_qf_flags          Internal helper function to determine
                        availability of data within a time interval
co2_to_umol             Convert co2 concentration from ppm to µmol m-3
                        units
compute_flux_gradient_layer
                        Computes Fick's law of diffusion between two
                        values
compute_monthly_mean    Function to compute monthly means for a given
                        month of NEON data.
compute_neon_flux       Compute NEON fluxes at a site
compute_surface_flux    Internal function to compute CO2 surface flux
compute_surface_flux_layer
                        Title Determine the surface flux from linear
                        regression at layers
correct_env_data        Internal function that prepares downloaded NEON
                        data for flux processing
dejong_shappert_flux    Internal function to compute surface co2 flux
                        at a given timepoint via De Jong and Schappert
                        (1972)
depth_interpolate       Internal function to interpolate different
                        depth measurements
determine_position      Internal function to determine the depth of a
                        measurement
diffusivity             Compute soil diffusivity
env_fingerprint_plot    Helper function to plot QF results for
                        environmental measurements.
fit_function            Internal function that interpolates a soil
                        measurement to different depths
flux_fingerprint_plot   Helper function to plot QF results for fluxes.
hirano_flux             Internal function to compute surface co2 flux
                        at a given timepoint via Hirano et al 2005
insert_mean             Internal function that inserts smoothed mean
                        value of a measurement at a site
inside_interval         Determine if a YYYY-MM string is inside a
                        interval
linear_regression       Compute linear regression coefficients and
                        errors.
measurement_detect      Internal function that makes sure for each
                        time, position, and depth we have at least two
                        data points for soil temp and soil h20, 3 for
                        soil co2
measurement_merge       Internal function that filters environmental
                        data for easier processing of fluxes.
neonBoulded60Cal        Soil water content calibrations for belowground
                        sensor data
neonCal                 Soil water content calibrations for belowground
                        sensor data
powerset                Compute all possible combinations of a vector -
                        ignoring the empty set
quadrature_error        Helper function to quickly compute the
                        quadrature error
reprocess_vswc          Internal helper function to reprocess SWC data
                        from calibration data
sjer_env_data_2022_06   Measured environmental data at a NEON site
sjer_flux_2022_06       Computed flux values at a NEON site
sjer_megapit_data_2022_06
                        Measured soil physical properties at a NEON
                        site
swc_correct             Internal function to correct depths for VSWC
                        NEON data.
swc_corrections         Corrected sensor locations for NEON soil water
                        content data
tang_2003_flux          Internal function to compute surface co2 flux
                        at a given timepoint via Tang et al 2003
tang_2005_flux          Internal function to compute surface co2 flux
                        at a given timepoint via Tang et al 2005
