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The United States Total DEPosition (TDEP) Project for Sulfur and Nitrogen
Citation:
Schwede, D. AND G. Lear. The United States Total DEPosition (TDEP) Project for Sulfur and Nitrogen. WMO Global Atmosphere Watch Workshop on Measurement Model Fusion for Global Total Atmospheric Deposi, Geneva, SWITZERLAND, February 28 - March 02, 2017.
Impact/Purpose:
The National Exposure Research Laboratory (NERL) Computational Exposure Division (CED) develops and evaluates data, decision-support tools, and models to be applied to media-specific or receptor-specific problem areas. CED uses modeling-based approaches to characterize exposures, evaluate fate and transport, and support environmental diagnostics/forensics with input from multiple data sources. It also develops media- and receptor-specific models, process models, and decision support tools for use both within and outside of EPA.
Description:
Estimates of total sulfur and nitrogen deposition are needed for use in critical loads and other ecosystem assessments. Measurements are available for some chemical species at individual locations for air concentration and wet deposition, but not dry deposition. Modeling provides a more complete species description but can be biased. A method was developed to fuse measurement and model values to provide values of total deposition for the U.S. Measurement-model fusion techniques are of interest to the global modeling community. Issues encountered in developing the method for the U.S. are outlined to promote discussion at the workshop.
