Fig. 2: Annual cycle and trends in CO2 amplitude.
From: Agricultural fertilization significantly enhances amplitude of land-atmosphere CO2 exchange
Plots illustrate the annual cycle (a–d), averaged for 1995-2005 and trends (e–h) at Cape Kumukahi, HI (19.7oN,155.0oW; altitude = 0.3 m), Mauna Loa, HI (19.5oN, 155.6oW, altitude = 3397.0 m), Niwot Ridge, CO (40.1oN, 105.6oW, altitude = 3523.0 m), and Point Barrow, AK (71.3oN, 156.61oW, altitude = 11.0 m) from NOAA’s CO2 flask network (black), CESM1 (orange), and CESM2 (purple) simulations. Shaded area in a-d illustrates the standard deviation across years. Simulation data are from the model grid cell and atmospheric level nearest the location of observation.
