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Nitrogen Deposition Onto The United States And Western Europe: Synthesis Of Observations And Models by Elisabeth A. Holland; Bobby H. Braswell; James Sulzman; Jean-Francois Lamarque is a Environmental Science article available to read on EtoBox.

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The documented acceleration of NH 3 and NO x (NO ϩ NO 2 ) emissions over the last 150 years has accelerated N deposition, compromising air and water quality and altering the functioning of terrestrial and aquatic ecosystems worldwide. To construct continental-scale N budgets, we produced maps of N deposition fluxes from site-network observations for the United States and Western Europe. Increases in the rates of N cycling for these two regions of the world are large, and they have undergone profound modification of biospheric-atmospheric N exchanges, and ecosystem function. The maps are necessarily restricted to the network measured quantities and consist of statistically interpolated fields of aqueous NO 3 Ϫ and NH 4 ϩ , gaseous HNO 3 and NO 2 (in Europe), and particulate NO 3 Ϫ and NH 4 ϩ . There remain a number of gaps in the budgets, including organic N and NH 3 deposition. The interpolated spatially continuous fields allow estimation of regionally integrated budget terms. Dry-deposition fluxes were the most problematic because of low station density and uncertainties associated with exchange mechanisms. We estimated dry N deposition fluxes by multiplying interpolated surface-a

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Author

Elisabeth A. Holland; Bobby H. Braswell; James Sulzman; Jean-Francois Lamarque

Publisher

Wiley

Published

2005

Language

EN

Field

Environmental Science (Physical Sciences)