ASDC | NARSTO_EPA_SS_ATLANTA_RAPID_SPMS_DATA

NARSTO Level 2

Entry Title: NARSTO EPA Supersite (SS) Atlanta 1999 Rapid Single-Particle Mass Spectrometer (SPMS) Data.

Entry ID: NARSTO_EPA_SS_ATLANTA_RAPID_SPMS_DATA_1

Aerosols Tropospheric Composition Field Campaigns

Description

NARSTO_EPA_SS_ATLANTA_RAPID_SPMS_DATA is the North American Research Strategy for Tropospheric Ozone (NARSTO) Environmental Protection Agency (EPA) Supersite (SS) Atlanta 1999 Rapid Single-Particle Mass Spectrometer (SPMS) Data product. Data for this product was obtained in August 1999 during the Atlanta Experiment of the EPA Particulate Matter (PM) Supersites Program.

During a month in the summer of 1999, individual aerosol particles were sized and analyzed using a Rapid Single-particle Mass Spectrometer (RSMS) in Atlanta. RSMS aerodynamically focuses one particle size at a time to the source region of a mass spectrometer and employs a 193 nm excimer laser to desorb and ionize the particle components. The ions are analyzed in a single time-of-flight mass spectrometer and the spectrum is digitally recorded. Spectra are only saved if the ion peak in the spectrum is above a threshold level. Background spectra were determined and flagged. Particle size scans were initiated periodically, and each size was sampled until 30 particle hits were obtained, unless the sampling time became excessive. Aerodynamic particle sizes ranged from about 40 to 1300 nm and were partitioned into nine discrete size classes logarithmically spaced, roughly, over the range.

Single particle data are valuable for the following reasons:

- they are collected and analyzed real time so have excellent temporal resolution,

- the particle-to-particle composition variations (external mixing properties) can be assessed, and

- key particle sources are easily identified since the particles retain source characteristics.

The data resulting from these measurements consist of an aerodynamic particle size and a positive mass spectrum of the components for each particle, along with the date and time of measurement and other incidental measurement parameters such as the laser pulse energy. Support for RSMS measurements was provided by the EPA Supersite program and additional funding from the EPA and National Science Foundation (NSF).

The EPA PM Supersites Program was an ambient air monitoring research program from 1999-2004 designed to provide information of value to the atmospheric sciences, and human health and exposure research communities. Eight geographically diverse projects were chosen to specifically address the following EPA research priorities: (1) to characterize PM, its constituents, precursors, co-pollutants, atmospheric transport, and its source categories that affect the PM in any region; (2) to address the research questions and scientific uncertainties about PM source-receptor and exposure-health effects relationships; and (3) to compare and evaluate different methods of characterizing PM including testing new and emerging measurement methods.

NARSTO, which has since disbanded, was a public/private partnership, whose membership spanned across government, utilities, industry, and academe throughout Mexico, the United States, and Canada. The primary mission was to coordinate and enhance policy-relevant scientific research and assessment of tropospheric pollution behavior; activities provide input for science-based decision-making and determination of workable, efficient, and effective strategies for local and regional air-pollution management. Data products from local, regional, and international monitoring and research programs are still available.

DOI

10.5067/ASDCDAAC/NARSTO/0058

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DATA CITATION POLICY

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GENERAL DOCUMENTATION

ASDC Data and Information for NARSTO

PRODUCT USAGE

Guide for NARSTO EPA_SS_ATLANTA 1999 Rapid Single-Particle Mass Spectrometer Data

PUBLICATIONS

EPA Supersites - Direct File Download (.kmz)

SCIENCE DATA PRODUCT VALIDATION

From GCMD Science Keywords:

PARTICULATES

Particle: Ion Mass-To-Charge (M/Z) Ratio
Particulates
Single Particle Mass Spectra

Data Distribution

File Format(s):

ASCII

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Spatial Information

Spatial Coverage: (S: 33.78, N: 33.78), (W: -84.41, E: -84.41)
Spatial Coverage Type: Horizontal
Coordinate System: Cartesian
Granule Spatial Representation: Cartesian

Locations

ATLANTA

Temporal Information

Temporal Coverage: 1999-08-10 - 1999-08-31

Platforms

Field Sites

FIELD SURVEYS

RSMS

Rapid Single-particle Mass Spectrometer

Metadata Dates

Created on 2003-12-01

Last updated on 2024-09-04