Table 1.

Summary of C-LAMP metrics for simulations with and without a photoperiod correction for V_cmax

Category	Possible score	Model without photoperiod correction	Model with photoperiod correction	Percent change because of introduction of photoperiod correction (%)
NPP	20	15.89	16.36	+3.0
LAI	15	11.50	11.74	+2.1
Carbon stocks	10	6.23	6.26	+0.5
Fluxnet*	20	11.56	11.75	+1.6
Fluxnet NEE†	5	1.98	2.22	+12.1
AmeriFlux‡	6	3.90	3.94	+1.0
AmeriFlux NEE§	1	0.41	0.46	+12.2
Fire variability	2	0.58	0.61	+5.2

Raw scores and percent changes are shown for major categories of C-LAMP metrics, and subscores are shown for net carbon fluxes at mid-to-high latitude stations (latitude > 45°N) in the Fluxnet and AmeriFlux categories. Positive changes indicate model improvements relative to observations. Details on observations and metrics are published elsewhere (19).

*Energy and carbon fluxes from Fluxnet.

^†Net ecosystem exchange submetric for six stations with latitude > 45°N.

^‡Energy and carbon fluxes from Ameriflux.

^§Net ecosystem exchange submetric for 19 stations with latitude > 45°N.