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Scientific Investigations Report 2014–5067

National Water-Quality Assessment Program

Estimates of Inorganic Nitrogen Wet Deposition from Precipitation for the Conterminous United States, 1955–84

By Jo Ann M. Gronberg, Amy S. Ludtke, and Donna L. Knifong

Thumbnail of and link to report PDF (4.4 MB)Abstract

The U.S. Geological Survey’s National Water-Quality Assessment program requires nutrient input information for analysis of national and regional assessment of water quality. Historical data are needed to lengthen the data record for assessment of trends in water quality. This report provides estimates of inorganic nitrogen deposition from precipitation for the conterminous United States for 1955–56, 1961–65, and 1981–84. The estimates were derived from ammonium, nitrate, and inorganic nitrogen concentrations in atmospheric wet deposition and precipitation-depth data. This report documents the sources of these data and the methods that were used to estimate the inorganic nitrogen deposition. Tabular datasets, including the analytical results, precipitation depth, and calculated site-specific precipitation-weighted concentrations, and raster datasets of nitrogen from wet deposition are provided as appendixes in this report.

First posted June 17, 2014

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Suggested citation:

Gronberg, J.M., Ludtke, A.S., and Knifong, D.L, 2014, Estimates of inorganic nitrogen wet deposition from precipitation for the conterminous United States, 1955–84: U.S. Geological Survey Scientific Investigations Report 2014–5067, 18 p., http://dx.doi.org/10.3133/sir20145067.

ISSN 2328-0328 (online)



Contents

Abstract

Introduction

Data Sources

Data-Processing Methods

Description of Aggregated Datasets

Summary

References Cited

Appendixes 1-14


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