A multi‐model study of the hemispheric transport and deposition of oxidised nitrogen

Fifteen chemistry‐transport models are used to quantify, for the first time, the export of oxidised nitrogen (NO y ) to and from four regions (Europe, North America, South Asia, and East Asia), and to estimate the uncertainty in the results. Between 12 and 24% of the NO x emitted is exported from each region annually. The strongest impact of each source region on a foreign region is: Europe on East Asia, North America on Europe, South Asia on East Asia, and East Asia on North America. Europe exports the most NO y , and East Asia the least. East Asia receives the most NO y from the other regions. Between 8 and 15% of NO x emitted in each region is transported over distances larger than 1000 km, with 3–10% ultimately deposited over the foreign regions.