Abstract
<strong class="journal-contentHeaderColor">Abstract.</strong> Global reactive nitrogen (N) deposition has more than tripled since 1860 and is expected to remain high due to land use changes and fossil fuel consumption. We update the 2010 global deposition budget for nitrogen and sulfur with new regional wet deposition measurements from Asia, improving the ensemble results of eleven global chemistry transport models from the second phase of the United Nation’s Task Force on Hemispheric Transport of Air Pollution (HTAP-II). The observationally adjusted global N deposition budget is 130 Tg-N, representing a 10 % increase and the adjusted global sulfur deposition budget is 80 Tg-S, representing no change. Our study demonstrates that a global measurement-model fusion approach can substantially improve N and S deposition model estimates at a regional scale and represents a step forward toward the World Meteorological Organization’s goal of global fusion products for accurately mapping harmful air pollution.
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