Fig. 4: Changes in NBP annual cycle and trends in land-only CESM2 simulations.
From: Agricultural fertilization significantly enhances amplitude of land-atmosphere CO2 exchange
Plots illustrate the 1996-2015 average annual cycle (a) and historical trends in amplitude (b) of NBP from land-only CESM2 (e.g., CLM5) simulations, averaged north of 30oN. The CLM5 simulation (purple) includes transient atmospheric forcing and active crop management (irrigation and fertilization). Additional perturbation simulations show the impacts of removing agricultural N fertilization (blue), not irrigating (yellow), preindustrial climate (orange), and preindustrial CO2 (green). Shaded area in a illustrates the standard deviation across years.
