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Global Change Master Directory (GCMD)
National Atmospheric Deposition Program/National Trends Network (NADP/NTN): Precipitation Chemistry Database
Entry ID: NADP_NTN


Summary
Abstract: The National Atmospheric Deposition Program/National Trends Network
(NADP/NTN) is a 200-station, rural, wet-only deposition monitoring
network throughout the continental United States, Alaska, and Puerto
Rico. The NADP was established in 1978 to provide a focal point for
the development of research to address the problem of acidic chemical
deposition.

Each station follows criteria and protocols established by the
NADP/NTN. Each station uses an Aerochem Metrics wet/dry precipitation
collector to collect cumulative weekly samples of precipitation for
chemical analysis, and a Belfort 5-780 Universal recording rain gage,
equipped with an event pen, to make independent precipitation
measurements. Samples are collected weekly and sent to the Central
Analytical Laboratory (CAL) operated by the Illinois State Water
Survey at the University of Illinois. Precipitation pH and conductance
are measured prior to shipment ("field pH") and again at the CAL ("lab
pH"). The samples are then filtered and measurements are made at the
CAL for the following ions: hydrogen (H or pH), ammonium (NH4),
calcium (Ca), magnesium (Mg), sodium (Na), potassium (K), sulfate
(SO4), nitrate (NO3), chloride (Cl), orthophosphate (PO4), and
specific conductance. Conductance and pH are analyzed by electrometric
methods; NH4 is measured by automated colorimetry; Ca, Mg, Na, and K
are measured by atomic absorption spectroscopy; and SO4, NO3, Cl, and
PO4 are measured by ion chromatography. All chemical measurements are
quality assured by the CAL.

All NADP/NTN data are stored at the NADP/NTN Coordination Office and
are available on the World-Wide Web at:

"http://nadp.sws.uiuc.edu/"

Data products available from that office include:

Annual Data Summaries - printed reports that include annual statistical
summaries, annual isopleth maps, seasonal summaries, and weekly ion
concentrations and precipitation amounts. These reports include data for all
sites in operation.

Precipitation-weighted mean concentrations in milligrams/liter (mg/L)
or microequivalents/liter (ueq/L) for annual, seasonal and monthly
summary periods.

Deposition totals in kiligrams/hectare (kg/ha) for annual and seasonal summary
periods.

Weekly data consisting of ion concentrations in mg/L and precipitation amounts
for individual weekly samples.

Data are available 6 months following the date of sample collection.
Data products listed above, except Annual Data Summaries, are
available in electronic form (diskettes, magnetic tape, Internet) for
all sites or a subset of sites in the network. All are available in
printed form for a subset of sites and/or time periods.

Also available are bibliographies listing publications which: a) describe
network design, operating procedures, data quality, and assessments thereof;
b) report network data, or c) cite, in peer-reviewed journals and books,
NADP/NTN data or the procedures and protocols of the network.

The NADP has expanded its sampling to include the Mercury Deposition
Network (MDN) ("http://nadp.sws.uiuc.edu/mdn/") and the Atmospheric
Integrated Research Monitoring Network (AIRMoN)
("http://nadp.sws.uiuc.edu/airmon/")

Related URL
Link: View Related Information
Description: National Atmospheric Deposition Program (NADP) GIS data set.

This description is a member of a collection. Click to see members of this collection.


Geographic Coverage
 N: 65.0 S: 18.0  E: -65.0  W: -171.0

Data Set Citation
Version: Not provided


Temporal Coverage
Start Date: 1978-07-04


Location Keywords
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > CARIBBEAN SEA > PUERTO RICO
CONTINENT > NORTH AMERICA > CANADA
OCEAN > PACIFIC OCEAN > CENTRAL PACIFIC OCEAN > AMERICAN SAMOA
CONTINENT > NORTH AMERICA
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > ALASKA > ALASKA


Data Resolution
Temporal Resolution: daily, weekly, monthly, annual, seasonal


Science Keywords
ATMOSPHERE >AIR QUALITY >NITROGEN OXIDES    [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >TRACE ELEMENTS/TRACE METALS >AMMONIUM    [Definition]
ATMOSPHERE >PRECIPITATION >LIQUID PRECIPITATION >RAIN >ACID RAIN    [Definition]
ATMOSPHERE >PRECIPITATION >PRECIPITATION AMOUNT    [Definition]
HUMAN DIMENSIONS >ENVIRONMENTAL IMPACTS >ACID DEPOSITION    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >CONTAMINANTS >ACID RAIN    [Definition]
ATMOSPHERE >ATMOSPHERIC CHEMISTRY >NITROGEN COMPOUNDS >NITROGEN OXIDES    [Definition]


Platform
GROUND STATIONS    [Information]


Instrument
DRY DEPOSITION COLLECTORS
RAIN GAUGES    [Information]
WET/DRY PRECIPITATION SAMPLERS    [Information]


Project
NADP >National Atmospheric Deposition Program    [Information]
NTN >National Trends Network    [Information]


Keywords
ACID DEPOSITION
ACID PRECIPITATION
ACID RAIN
AMMONIUM
ATMOSPHERIC CHEMISTRY
CA
CALCIUM
CHLORIDE
CL
CONDUCTANCE
DEPOSITION
H
HYDROGEN
ION CONCENTRATIONS
K
MAGNESIUM
MG
NA
NADP
NAPAP
NH4
NITRATE
NO3
NTN
NUTRIENTS
PH
PHOSPHATE
PO4
POLLUTANTS
POTASSIUM
PRECIPITATION CHEMISTRY
SO4
SODIUM
SULFATE
WET DEPOSITION


Data Center
National Atmospheric Deposition Program, Water Survey, Dept. of Natural Resources, Illinois    [Information]
Data Center URL: http://nadp.sws.uiuc.edu/

Data Center Personnel
Name: NADP/NTN COORDINATION OFFICE
Phone: (217) 333-7873
Email: nadp at sws.uiuc.edu
Contact Address:
NADP/NTN Coordination Office
Illinois State Water Survey
2204 Griffith Drive
City: Champaign
Province or State: IL
Postal Code: 61820
Country: USA



Distribution
Distribution_Media: online WWW
Fees: None


Personnel
VAN C. BOWERSOX
Role: TECHNICAL CONTACT
Phone: 217-333-7873
Email: nadp at sws.uiuc.edu
Contact Address:
NADP/NTN Coordination Office
Illinois State Water Survey
2204 Griffith Drive
City: Champaign
Province or State: IL
Postal Code: 61820
Country: USA


GENE R. MAJOR
Role: METADATA AUTHOR
Email: gsfc-gcmduso at mail.nasa.gov


Extended Metadata Properties
(Click to view more)

Creation and Review Dates
DIF Creation Date: 1970-01-01
Last DIF Revision Date: 2018-07-30



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