Fig. 1.

Time series of biogenic CO₂ fluxes for Alaska during 2012–2014 calculated from CARVE aircraft data. (A) Mean daily net biogenic CO₂ flux for Alaska during 2012–2014, with modeled (PVPRM-SIF) CO₂ flux (green) and the aircraft optimized net CO₂ flux (red) and interpolated aircraft optimized net CO₂ flux (black). Our approach for estimating these fluxes and the uncertainty range (shown with shading) is described in SI Appendix, Calculation of the Additive Flux Correction. (B) Optimized biogenic CO₂ fluxes for different regions in Alaska: NS tundra (blue), SW tundra (orange), and boreal forests (green).