NARSTO EPA_SS_BALTIMORE Rapid Single-Particle Mass Spectrometer DataEntry ID: NARSTO_EPA_SS_BALTIMORE_RSMS
Abstract: The NARSTO_EPA_SS_BALTIMORE_RAPID_SPMS_DATA were obtained in 2002 at the Baltimore Supersite.
During 7 months starting in May 2002, individual aerosol particles were sized and analyzed using a Rapid Single-particle Mass Spectrometer (RSMS) in Baltimore. 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 dual 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 because for instance a) they are collected and analyzed real time so have excellent temporal resolution, b) the particle-to-particle composition variations (external mixing properties) can be assessed, and c) 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 and negative 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 were provided by the EPA Supersites program and additional funding from the EPA.
The U.S. EPA Particulate Matter (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 these 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 (formerly North American Research Strategy for Tropospheric Ozone) is a public/private partnership, whose membership spans government, the utilities, industry, and academe throughout Mexico, the United States, and Canada. The primary mission is 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 available.
Start Date: 2002-03-20Stop Date: 2002-12-10
Temporal Resolution: Variable
Data Set Progress
Email: aswexler at ucdavis.edu
Email: mvj at udel.edu
Role: TECHNICAL CONTACT
Email: aswexler at ucdavis.edu
Role: DIF AUTHOR
Email: support-asdc at earthdata.nasa.gov
NASA Langley Atmospheric Science Data Center User and Data Services NASA Langley Research Center Mail Stop 157D
Province or State: VA
Postal Code: 23681-2199
Phares, D.J., K.P. Rhoads, and A.S. Wexler. 2002. Performance of a single
ultrafine particle mass spectrometer. Aerosol Sci. Tech. 36:583-592.
Phares, D.J., K.P. Rhoads, A.S. Wexler, and M.V. Johnston. 2003. Size-resolved
ultrafine particle composition analysis - 2. Houston. JOURNAL OF GEOPHYSICAL
RESEARCH-ATMOSPHERES 108 (D7): 8420-8420.
Rhoads, K.P., D.J. Phares, A.S. Wexler, and M.V. Johnston. 2003. Size-resolved
ultrafine particle composition analysis, 1. Atlanta. J. JOURNAL OF GEOPHYSICAL
RESEARCH-ATMOSPHERES 108 (D7): 8418-8418.
Extended Metadata Properties
(Click to view more)
Creation and Review Dates
DIF Creation Date: 2005-12-14
Last DIF Revision Date: 2013-11-13