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. Author manuscript; available in PMC: 2018 Apr 13.
Published in final edited form as: Geophys Res Lett. 2017 Mar 16;44(6):2875–2884. doi: 10.1002/2016GL072305

Figure 1. Trend in AIRS NH3.

Figure 1

Top: Temporal trends (+ 0.3 to −0.3 ppbv yr−1). The locations and the last two digits of the years of biomass burning events (in square brackets) are marked as BB. The main agricultural regions are marked as AG. Bottom: national averaged annual N fertilizer usage in 2002 – 2013 in kg ha−1 and trends [percentage changes] in kg ha−1 yr−1 [% yr−1]; see text for details.