This data set provides global gridded estimates of atmospheric deposition of total inorganic nitrogen (N), NHx (NH3 and NH4+), and NOy (all oxidized forms of nitrogen other than N2O), in mg N/m2/year, for the years 1860 and 1993 and projections for the year 2050. The data set was generated using a global three-dimensional chemistry-transport model (TM3) with a spatial resolution of 5 degrees longitude by 3.75 degrees latitude (Jeuken et al., 2001; Lelieveld and Dentener, 2000). Nitrogen emissions estimates (Van Aardenne et al., 2001) and projection scenario data (IPCC, 1996; 2000) were used as input to the model.

This data set provides global gridded estimates of atmospheric deposition of total inorganic nitrogen (N), NHx (NH3 and NH4+), and NOy (all oxidized forms of nitrogen other than N2O), in mg N/m2/year, for the years 1860 and 1993 and projections for the year 2050. The data set was generated using a global three-dimensional chemistry-transport model (TM3) with a spatial resolution of 5 degrees longitude by 3.75 degrees latitude (Jeuken et al., 2001; Lelieveld and Dentener, 2000). Nitrogen emissions estimates (Van Aardenne et al., 2001) and projection scenario data (IPCC, 1996; 2000) were used as input to the model. The model output grids were subdivided into 50 km x 50 km sub-grids to create spatially defined deposition maps. The gridded data were assigned to continental and marine regions using boundaries delineated on a world data coverage from ESRI (1993).The data are stored as ASCII text files (.txt), in tab delimited format. The data can be used to produce maps that illustrate both the temporal and spatial variability of atmospheric deposition of N, NHx, and NOy as well as the degree of alteration and regional heterogeneity in deposition through time. Nine data files are provided to produce the following maps:Global N Deposition (1860, 1993, and 2050)Global NHx Deposition (1860, 1993, and 2050)Global NOy Deposition (1860, 1993, and 2050).

This dataset identifies the amount of wet, dry, and total deposition of nitrogen in kilograms per hectare from 2014 to 2016 at a set of point locations across the contiguous 48 states. Summary data in this indicator were provided by EPA’s Office of Atmospheric Programs, based on deposition data from two sources. Wet deposition data are from the National Atmospheric Deposition Program/National Trends Network (NADP, 2018) (http://nadp.slh.wisc.edu/), and dry deposition data are from the Clean Air Status and Trends Network (U.S. EPA, 2018) (https://www.epa.gov/castnet). This indicator aggregates data across 3-year periods to avoid influences from short-term fluctuations in meteorological conditions.

This dataset identifies the amount of wet, dry, and total deposition of nitrogen in kilograms per hectare from 2014 to 2016 at a set of point locations across the contiguous 48 states. Summary data in this indicator were provided by EPA’s Office of Atmospheric Programs, based on deposition data from two sources. Wet deposition data are from the National Atmospheric Deposition Program/National Trends Network (NADP, 2018) (http://nadp.slh.wisc.edu/), and dry deposition data are from the Clean Air Status and Trends Network (U.S. EPA, 2018) (https://www.epa.gov/castnet). This indicator aggregates data across 3-year periods to avoid influences from short-term fluctuations in meteorological conditions.

This dataset identifies the amount of wet, dry, and total deposition of nitrogen in kilograms per hectare from 2014 to 2016 at a set of point locations across the contiguous 48 states. Summary data in this indicator were provided by EPA’s Office of Atmospheric Programs, based on deposition data from two sources. Wet deposition data are from the National Atmospheric Deposition Program/National Trends Network (NADP, 2018) (http://nadp.slh.wisc.edu/), and dry deposition data are from the Clean Air Status and Trends Network (U.S. EPA, 2018) (https://www.epa.gov/castnet). This indicator aggregates data across 3-year periods to avoid influences from short-term fluctuations in meteorological conditions.

This dataset identifies the amount of wet, dry, and total deposition of nitrogen in kilograms per hectare from 2014 to 2016 at a set of point locations across the contiguous 48 states. Summary data in this indicator were provided by EPA’s Office of Atmospheric Programs, based on deposition data from two sources. Wet deposition data are from the National Atmospheric Deposition Program/National Trends Network (NADP, 2018) (http://nadp.slh.wisc.edu/), and dry deposition data are from the Clean Air Status and Trends Network (U.S. EPA, 2018) (https://www.epa.gov/castnet). This indicator aggregates data across 3-year periods to avoid influences from short-term fluctuations in meteorological conditions.

This dataset identifies the amount of wet, dry, and total deposition of nitrogen in kilograms per hectare from 2014 to 2016 at a set of point locations across the contiguous 48 states. Summary data in this indicator were provided by EPA’s Office of Atmospheric Programs, based on deposition data from two sources. Wet deposition data are from the National Atmospheric Deposition Program/National Trends Network (NADP, 2018) (http://nadp.slh.wisc.edu/), and dry deposition data are from the Clean Air Status and Trends Network (U.S. EPA, 2018) (https://www.epa.gov/castnet). This indicator aggregates data across 3-year periods to avoid influences from short-term fluctuations in meteorological conditions.

The Nitrogen Dioxide Surface-Level Annual Average Concentrations Product (SFC_NITROGEN_DIOXIDE_CONC) contains estimated global NO2 surface values derived using a Land Use Regression (LUR) model (based on 5220 NO2 monitors in 58 countries and land use variables) for the years 2010-2012. NO2 column densities from the Ozone Monitoring Instrument and MERRA-2 scale the concentrations to other years between 1990 and 2020. This product is part of NASA's Health and Air Quality Applied Sciences Team (HAQAST) effort.The data are global over land and span the latitude range between 60 south and 75 north, gridded at 0.0083 degree resolution (array size is 43080 x 16200). Data variables include surface NO2, as well as latitude and longitude values. The data are written to files using the new version 4 netCDF format. The average file size is about 150 Megabytes.

This dataset identifies the amount of wet, dry, and total deposition of nitrogen in kilograms per hectare from 1989 to 1991 at a set of point locations across the contiguous 48 states. Summary data in this indicator were provided by EPA’s Office of Atmospheric Programs, based on deposition data from two sources. Wet deposition data are from the National Atmospheric Deposition Program/National Trends Network (NADP, 2018) (http://nadp.slh.wisc.edu/), and dry deposition data are from the Clean Air Status and Trends Network (U.S. EPA, 2018) (https://www.epa.gov/castnet). This indicator aggregates data across 3-year periods to avoid influences from short-term fluctuations in meteorological conditions.

This dataset identifies the amount of wet, dry, and total deposition of nitrogen in kilograms per hectare from 1989 to 1991 at a set of point locations across the contiguous 48 states. Summary data in this indicator were provided by EPA’s Office of Atmospheric Programs, based on deposition data from two sources. Wet deposition data are from the National Atmospheric Deposition Program/National Trends Network (NADP, 2018) (http://nadp.slh.wisc.edu/), and dry deposition data are from the Clean Air Status and Trends Network (U.S. EPA, 2018) (https://www.epa.gov/castnet). This indicator aggregates data across 3-year periods to avoid influences from short-term fluctuations in meteorological conditions.