Fig. 2: Temporal evolution of N inputs and N2O emissions, and growth rates of N2O emissions and N2O mixing ratio.
a Annual inputs for fertilisation, deposition, fixation, and total N used in the model (see Methods: at the same geographical locations to gapfill the ancillary data for data sources). b The anthropogenic flux broken down into N input categories of fertilisation, deposition and fixation, estimated by assuming that all increases in N2O emissions for all input categories (fixation, fertilisation, deposition) after 1850 are due to anthropogenic influences. Total N2O emissions, including non-soil N2O emissions, are also shown. The shaded areas indicate the 1σ uncertainty.N2O emission data prior to 1900 as well as the breakdown of natural emissions driven by deposition and fixation are shown in Supplementary Fig. 11. c The growth rate of N2O emissions from each input category calculated over 3 and 10 year windows (pale and dark lines respectively, using colours indicated for fertilisation, fixation and deposition). d The growth rate in modelled N2O tropospheric mixing ratio (left axis; purple solid line) as well as the modelled change in mixing ratio growth rate (right axis; blue dotted line).
