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National Atmospheric Deposition Program (NADP)

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Purpose: To determine particulate matter in the air that will enter the headwaters of the Colorado River basin.

Sites & Scope: GCWIN is responsible for operating site CO09 of the National Trends Network (NTN). Equipment for CO09 was installed at the end of 2011 and is located near the west entrance to Rocky Mountain National Park. NTN is the largest, long-term network for precipitation chemistry across the United States, originating in 1977 as a State Agricultural Experiment Stations project.

Sampling Type & Frequency: Samples of wet atmosphere are collected weekly by a team of volunteers and GCWIN staff.

Sampling Entity(ies): RMNP is currently conducting sampling. Composite samples are shipped to the Central Analytic Laboratory at the University of Illinois in Champaign. Samples are analyzed for free acidity (H+ as pH), conductance, calcium (Ca2+), magnesium (Mg2+), sodium (Na+), potassium (K+), sulfate (SO42-), nitrate (NO3-), chloride (Cl1), and ammonium (NH4+).

Sampling Protocol: Samples are collected using an AeroChem 301 Precipitation Collector and a Noah IV Raingage. QA/QC is administered by NADP and externally by the Environmental Protection Agency and US Geological Survey.

Funding Partners: Bureau of Reclamation, Grand County, Northern Colorado Water Conservancy District, Rocky Mountain National Park

Data: NADP/NTN Wet Deposition Data

Links: National Atmospheric Deposition Program

This Program was Transferred to the Rocky Mountain National Park as of September 30, 2017 for information regarding site Contact: Jim Bromberg - 1-970-586-1302

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