Interannual variability in soil nitric oxide emissions over the United States as viewed from space

Abstract. We examine the interannual variability in the NO₂ column over North America measured by the Ozone Monitoring Instrument (OMI) in 2005–2008. By comparison to a model of soil NO_x emissions driven by the North American Regional Reanalysis precipitation and 0–10 cm soil temperature fields, we show the source of this observed interannual variability over much of the central United States in June is fertilizer application. We find that dry, warm conditions followed by convective precipitation induces pulsed emissions of NO_x over the agricultural Great Plains. In June 2006 we infer a 50% increase in soil NO_x emission and a 30% increase in the tropospheric NO₂ column relative to the June 2005–2008 mean. In a case-study of fertilized corn and soybean fields over SE South Dakota, we find an associated rain-induced pulsing event reaching 4.6×10¹⁵ molec cm⁻², equivalent to a surface concentration of ~2 ppbv. We calculate that soil NO_x emissions resulted in a mean daily maximum 8-h ozone enhancement over the agricultural Great Plains of 5 ppbv in June 2006 (with predicted events reaching 16 ppbv) compared with a mean enhancement of 3 ppbv for soil NO_x in the years 2005–2008.