Total Deposition Estimates Using a Hybrid Approach with Modeled and Monitoring Data

OwnerUnited States Environmental Protection Agency - view all

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Last updatedabout 1 year ago

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Overview

Total deposition maps and the underlying data have been produced using wet deposition measurements from the NADP National Trends Network (NTN) and estimates of dry deposition using a method that combines ambient air monitoring data with output from the Community Multiscale Air Quality (CMAQ) modeling system. This method of estimating dry deposition gives priority to measurement data near the location of the monitor and priority to CMAQ data in areas where monitoring data are not available. Additionally, CMAQ output is used for species such as peroxyacetylnitrate (PAN), dinitrogen pentoxide (N2O5), nitric oxide (NO), nitrogen dioxide (NO2), nitrous acid (HONO) and organic nitrate that are not routinely measured, but likely contribute a significant amount to the total nitrogen budget. The sections below provide details on the monitoring and modeling data and methodology. In the final section, notes and caveats are provided that discuss limitations of the data. Note that this product is dynamic and will be updated as new monitoring and modeling data become available and as improvements to the methodology are implemented. Therefore, it is critical to note the version number associated with the data. The version number consists of a 4-digit year and a 2-digit release number. The data described below is denoted as version 2016.01.

CASTNET EPA NADP National Trends Network air quality dinitrogen pentoxide nitric oxide nitrogen nitrogen dioxide nitrous acid organic nitrate peroxyacetylnitrate

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