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_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 fucntion to compute CO2 surface flux
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
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.
quadrature_error        Helper function to quickly compute the
                        quadrature error
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
