New Deposition Measurements in the National Atmospheric Deposition Program (Invited Presentation)

The National Atmospheric Deposition Program (NADP) currently monitors across North America for a number of inorganic species and mercury in precipitation for wet deposition flux (sulfate, nitrate, ammonium, cations, etc., https://nadp.slh.wisc.edu/). However, as science and policy needs evolve, so must routine measurements evolve to provide long-term and consistent measurements of new contaminants to continue to meet these needs. Over the last two years, several new emerging measurements have been developed within the NADP structure designed to meet these new topics

This talk will introduce several new measurements within the NADP networks (National Trends Network, Mercury Deposition Networks), which include wet deposition measurements for total nitrogen and total phosphorus (TNTP) in precipitation; for per- and polyfluoroalkyl substances (PFAS) compound wet deposition; and measurements of Black Carbon (BC) wet deposition. Each new measurement will be briefly discussed, informing attendees of general plans, measurement procedures, timelines for routine network operation, and initial precipitation observations. Additional time will be used for the presentation of BC results, given its obvious connection to the radiation budget and climate modeling. Additionally we will discuss a few coming changes to decrease the cost of wet deposition of mercury and atmospheric ammonia estimates of dry deposition, and a potential to begin measurement aeroallergen atmospheric concentrations.