Contributions of atmospheric nitrogen deposition to U.S. estuaries: Summary and conclusions: Chapter 8

By: , and 
Edited by: Richard A. ValiguraRichard B. AlexanderMark S. CastroTilden P. MeyersHans W. PaerlPaul E. Stacey, and R. Eugene Turner

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Abstract

A NOAA project was initiated in 1998, with support from the U.S. EPA, to develop state-of-the-art estimates of atmospheric N deposition to estuarine watersheds and water surfaces and its delivery to the estuaries. Work groups were formed to address N deposition rates, indirect (from the watershed) yields from atmospheric and other anthropogenic sources, and direct deposition on the estuarine waterbodies, and to evaluate the levels of uncertainty within the estimates. Watershed N yields were estimated using both a land-use based process approach and a national (SPARROW) model, compared to each other, and compared to estimates of N yield from the literature. The total N yields predicted by the national model were similar to values found in the literature and the land-use derived estimates were consistently higher. Atmospheric N yield estimates were within a similar range for the two approaches, but tended to be higher in the land-use based estimates and were not wellcorrelated. Median atmospheric N yields were around 15% of the total N yield for both groups, but ranged as high as 60% when both direct and indirect deposition were considered. Although not the dominant source of anthropogenic N, atmospheric N is, and will undoubtedly continue to be, an important factor in culturally eutrophied estuarine systems, warranting additional research and management attention.

Additional publication details

Publication type Book chapter
Publication Subtype Book Chapter
Title Contributions of atmospheric nitrogen deposition to U.S. estuaries: Summary and conclusions: Chapter 8
ISBN 9780875902715
DOI 10.1029/CE057p0187
Year Published 2001
Language English
Publisher Wiley
Contributing office(s) Pacific Regional Director's Office, San Francisco Bay-Delta
Description 40 p.
Larger Work Type Book
Larger Work Subtype Monograph
Larger Work Title Nitrogen loading in coastal water bodies: An atmospheric perspective
First page 187
Last page 226
Online Only (Y/N) N
Additional Online Files (Y/N) N