US EPA Total Deposition Layers

Description:

The Total Deposition Science Committee (TDep) provides estimates of total nitrogen and sulfur deposition fluxes across the United States for use in critical loads and other ecological assessments, particularly where loading results in the acidification and eutrophication of ecosystems. Total deposition flux estimates are derived from summing contributions from wet and dry deposition.

Organization: US EPA

Website: https://nadp.slh.wisc.edu/committees/tdep/

Google Earth Engine Community Catalog: Ingested from https://gee-community-catalog.org/projects/tdep/?h=tdep, see for more detailed documentation

Spatial Resolution: 4km

Time Span: 2000 - 2023

Variables:

Dry equivalent deposition of all base cations
Dry deposition of base cations as percent of total (wet + dry) deposition
Total equivalent deposition of all base cations
Dry deposition of calcium
Total deposition of calcium
Wet deposition of calcium
Dry deposition of chlorine
Total deposition of chlorine
Wet deposition of chlorine
Total deposition of nitric acid
Dry deposition of potassium
Total deposition of potassium
Wet deposition of potassium
Dry deposition of magnesium
Total deposition of magnesium
Wet deposition of magnesium
Dry deposition of nitrogen
Dry deposition of nitrogen as percent of total (wet + dry) deposition
Total (wet + dry) nitrogen deposition
Wet deposition of nitrogen
Wet deposition of nitrogen as percent of total (wet + dry) deposition
Dry deposition of sodium
Total deposition of sodium
Wet deposition of sodium
Dry deposition of ammonia
Dry deposition of particulate ammonium
Wet deposition of particulate ammonium
Dry deposition of particulate nitrate
Wet deposition of particulate nitrate
Dry deposition of unmeasured nitrogen species*
Dry deposition of unmeasured nitrogen species as percent of total deposition
Dry deposition of oxidized nitrogen
Dry deposition of oxidized nitrogen as percent of total deposition
Total (wet + dry) deposition of oxidized nitrogen
Total deposition of oxidized nitrogen as percent of total deposition
Dry deposition of reduced nitrogen
Dry deposition of reduced nitrogen as percent of total deposition
Total (wet + dry) deposition of reduced nitrogen
Total deposition of reduced nitrogen as percent of total deposition
Total equivalent nitrogen + sulfur deposition
Annual precipitation
Dry deposition of sulfur
Dry deposition of sulfur as percent of total deposition
Total (wet + dry) sulfur deposition
Wet deposition of sulfur
Wet deposition of sulfur as percent of total deposition
Dry deposition of sulfur dioxide
Dry deposition of particulate sulfate
Dry deposition of nitric acid + particulate nitrate

Terms of Use:

The TDEP data layers are distributed under a license similar to Public domain license and distributed by United States Environmental Protection Agency (EPA).
Created by: United States Environmental Protection Agency (EPA) and the National Atmospheric Deposition Program (NADP)
Curated in GEE by: Samapriya Roy

References:

Schwede, D.B. and G.G. Lear, 2014. A novel hybrid approach for estimating total deposition in the United States, Atmospheric Environment, 92, 207-220. 10-15. 10.1016/j.atmosenv.2014.04.008.
National Atmospheric Deposition Program, 2024. Total Deposition Maps README. Total Deposition Estimates Using the Measurement Model Fusion (TDep MMF version 2023.01) Approach with Modeled and Monitoring. https://nadp.slh.wisc.edu/committees/tdep/ . [4/17/24].