|National Atmospheric Deposition Program -
part of the National Atmospheric Deposition Program/National Trends
Network (NADP/NTN), precipitation is captured at two sites on GLEES.
One site, WY95 (Brooklyn), is located at the Brooklyn Lake monitoring
site, and the second site, WY00 (Snowy Range), is located near West
Glacier Lake. A paired comparison of the Brooklyn site was operated
1998-1999 for QA/QC and the site is available for further instrumentation
evaluation or comparison.
There are about 200 NADP/NTN stations across the United States,
Puerto Rico, and American Samoa. Wet deposition is collected continuously
at these stations throughout the year, with samples removed between
0900 and 1100 every Tuesday and analyzed locally for pH and conductivity.
Samples are then shipped to a central analytical laboratory operated
by the Illinois State Water Survey, where they are analyzed for
SO4, NO3, Cl, PO4, Na, K, Ca, Mg, NH4, H and reanalyzed for pH and
Precipitation amounts at the NADP/NTN sites are collected by a Belfort
dual traverse recording rain gage, and through utilization of a
weight calculation of the sample. NADP data are available from the
network, including the two GLEES sites, at: http://nadp.sws.uiuc.edu