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CT-NRT.v2023-4
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Park Falls, Wisconsin, United States
Site Latitude 45° 56' 42.36" N (45.94510 °N)
Site Longitude 90° 16' 23.52" W (-90.27320 °E)
Site Elevation472.0 masl
Site codeLEF
Datasetco2_lef_tower-insitu_1_allvalid-396magl (GLOBALVIEW identifier LEF_01C3)
AssimilatedYes Switch to unassimilated subset
Selection schemeall valid hourly data from 396 magl
Data providerArlyn Andrews, NOAA GML, 325 Broadway R/GML-1, Boulder, CO 80305-3328, United States, and Peter Bakwin, United States
Partner(s)Kenneth Davis, Department of Meteorology, The Pennsylvania State University, University Park, PA 16802, United States, and Ankur Desai, United States, and Dan Baumann, United States
Laboratory
NOAA Global Monitoring Laboratory, 325 Broadway, NOAA R/GML-1, Boulder, CO 80305-3328, United Statesnoaa_medium
University of Wisconsin, United Statesuofwi_medium
Download these data via ObsPack.

All data plotted

(a) Observed and simulated [CO₂]
[CO₂] (μmol mol⁻¹)
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(b) Model-minus-observed [CO₂] residuals
Δ[CO₂] (μmol mol⁻¹)
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(a) Time series of CO2 mole fractions, both simulated and observed, at this CarbonTracker observation site. Vertical black line at January 1st, 2021 marks the beginning of CT-NRT.v2023-4 period. Prior to this date results from CT2022 are plotted. In the top panel, measured mole fractions (filled black circles) are plotted along with CarbonTracker simulated values (filled light blue circles) and withheld observations (filled yellow circles). Any observations that CarbonTracker can not assimilate successfully are shown as filled red circles.
(b) The time series of model residuals--the difference between the simulated and measured mole fractions--shown with dark green filled circles. These residuals should be uncorrelated in time, unbiased (i.e., have a mean of zero), and distributed normally. Also shown in the lower panel is the imposed model-data mismatch ("MDM", orange lines), which in part defines the rejection criterion (see documentation). Any model first guess value which is more than three times the MDM away from zero, after accounting for potential adjustments to the simulated value due to optimizing fluxes, is rejected by the optimization system. Rejected values, if there are any, are shown with filled red circles.

(c) Summary statistics of residuals from assimilated and withheld measurements
assimilated rejected withheld
n 0 0 0
bias N/A N/A N/A
std dev. N/A N/A N/A
RMSE N/A N/A N/A
(c) Summary statistics for model residuals from 2016-Jan-01 00:00:00 to 2023-Feb-28 00:00:00. Residuals are defined as simluated values minus observed 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 ppm of CO2. The time period over which these quantities are computed is set by the graphs (a) and (b).