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Publication Abstract

National Atmospheric Deposition Program, Total Deposition Program 2015 Gay, David, 2016  Illinois State Water Survey, Champaign, IL,  ISWS MP-206    Full Text Available

About the Total Deposition Maps
In October 2011, the National Atmospheric Deposition Program (NADP) Executive Committee formed the Total Deposition (TDEP) Science Committee. The mission of TDEP is to improve estimates of atmos-pheric deposition by advancing the science of measuring and modeling atmospheric wet, dry, and total deposition of species such as sulfur, nitrogen, and mercury by providing a forum for the exchange of information on current and emerging issues within a broad multi-organization context including atmos-pheric scientists, ecosystem scientists, resource managers, and policy makers.

For more information regarding TDEP, please visit the NADP-TDEP web page at

What is Total Deposition?
Total deposition estimates are derived from summing wet and dry deposition. Members of this multi-organization committee worked to develop a “hybrid approach” to mapping total deposition that com-bines measured and modeled values. One of the initial goals of TDEP was to provide estimates of total sulfur and nitrogen deposition across the U.S. for use in critical loads and other assessments, where loading results in the acidification and eutrophication of ecosystems. Measured values are given more weight at the monitoring locations, and modeled data are used to fill in spatial gaps and provide infor-mation on chemical species that are not measured by routine monitoring networks. One of the main advantages of this approach is that it will provide continuous spatial and temporal coverage of total deposition estimates in the U.S. (beginning in 2000), which until this point, have been unavailable.


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