EnviroAtlas - Atmospheric Nitrogen Deposition by 12-digit HUC for the Conterminous United States (2002)

Metadata Updated: February 8, 2018

This EnviroAtlas dataset includes annual nitrogen and sulfur deposition within each 12-digit HUC subwatershed for the year 2002. Values are provided for total oxidized nitrogen (HNO3, NO, NO2, N2O5, NH3, HONO, PAN, organic nitrogen, and particulate NO3), oxidized nitrogen wet deposition, oxidized nitrogen dry deposition, total reduced nitrogen (NH3 and particulate NH4), reduced nitrogen dry deposition, reduced nitrogen wet deposition, total dry nitrogen deposition, total wet nitrogen deposition, total nitrogen deposition (wet+dry), total sulfur (SO2 + particulate SO4) dry deposition, total sulfur wet deposition, and total sulfur deposition. The dataset is based on output from the Community Multiscale Air Quality modeling system (CMAQ) v5.0.2 run using the bidirectional flux option for the 12-km grid size for the US, Canada, and Mexico. The CMAQ output has been post-processed to adjust the wet deposition for errors in the location and amount of precipitation and for regional biases in the TNO3 (HNO3 + NO3), NHx (NH4 + NH3), and sulfate wet deposition. Model predicted values of dry deposition were not adjusted. This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (https://www.epa.gov/enviroatlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem services for the contiguous United States. The dataset is available as downloadable data (https://edg.epa.gov/data/Public/ORD/EnviroAtlas) or as an EnviroAtlas map service. Additional descriptive information about each attribute in this dataset can be found in its associated EnviroAtlas Fact Sheet (https://www.epa.gov/enviroatlas/enviroatlas-fact-sheets).

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Dates

Metadata Date January 31, 2018
Metadata Created Date November 20, 2015
Metadata Updated Date February 8, 2018
Reference Date(s) November 14, 2013 (publication)
Frequency Of Update asNeeded

Metadata Source

Harvested from Environmental Dataset Gateway FGDC CSDGM

Additional Metadata

Resource Type Dataset
Metadata Date January 31, 2018
Metadata Created Date November 20, 2015
Metadata Updated Date February 8, 2018
Reference Date(s) November 14, 2013 (publication)
Responsible Party US Environmental Protection Agency, Research Triangle Park (Point of Contact)
Contact Email
Access Constraints Use Constraints: None. Please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the most recent copy of both data and metadata. Acknowledgement of the EPA would be appreciated., Access Constraints: None.
Bbox East Long -65.20336449
Bbox North Lat 51.6773602
Bbox South Lat 22.7348894
Bbox West Long -128.02839229
Coupled Resource
Frequency Of Update asNeeded
Guid
Harvest Object Id 1cc5352c-5cc4-4d66-9bb9-7d2f6d17651c
Harvest Source Id d0d72986-7693-406b-b71d-840540909711
Harvest Source Title Environmental Dataset Gateway FGDC CSDGM
Licence https://edg.epa.gov/EPA_Data_License.htm
Licence Url https://edg.epa.gov/EPA_Data_License.htm
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2002-01-01
Temporal Extent End 2002-12-31

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