Site Latitude	45° 56' 42.36" N (45.94510 °N)	Go to interactive map
Site Longitude	90° 16' 23.52" W (-90.27320 °E)
Site Elevation	472.0 masl
Site code	LEF
Dataset	ch4_LEF_ch4_surface_hourly_NOAA
Assimilated	Yes Switch to unassimilated subset
Data provider	Arlyn Andrews
Laboratory	NOAA Global Monitoring Division

(a) Time series of CH₄ mole fractions, both observed and simulated, at this CarbonTracker-CH4 observation site. The measured mole fractions (black circles) are plotted along with CarbonTracker-CH4 simulated values with prior fluxes (dark green circles) and posterior fluxes (blue circles).

(b) The time series of model residuals, the difference between the measured and simulated mole fractions, for simulation with prior fluxes (dark green circles) and posterior fluxes (blue circles).

(c) Summary statistics for model residuals from to . Residuals are defined as observed values minus simulated values. "Bias" is the mean of the residuals; "std. dev." is the standard deviation, and RMSE is root-mean-square error. All quantities are in ppb of CH4. The time period over which these quantities are computed is set by the graphs (a) and (b).