Annual gradient maps of precipitation-weighted mean concentrations and depostion
are available for MDN. These maps are available in PDF and KMZ formats.
About the maps
In 2011, the NADP Technical Committee instituted changes in the way NADP annual concentration and deposition maps are produced. It was decided to modify the original map series from a discrete contour map style to a continuous color gradient map style while incorporating an external, highly resolved precipitation dataset.
More information about the process used to create these maps is available.
The old-style isopleth maps through 2009 are available in the NADP Map Archive
If you intend on reprinting any of these maps for use in a publication, please read our Use Conditions.