NARSTO EPA_SS_HOUSTON Rapid Single-Particle Mass Spectrometer DataEntry ID: NARSTO_EPA_SS_HT_RSMS
Abstract: The NARSTO_EPA_SS_HOUSTON_RAPID_SPMS_DATA contain individual aerosol particles which were sized and analyzed using a Rapid Single-particle Mass Spectrometer (RSMS) in Houston during the summer of 2000. 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 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 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 U.S. EPA.
The Houston Supersite is one of several Supersites that was established in urban areas within the United States by the U.S. Environmental Protection Agency (EPA) to better understand the measurement, sources, and health effects of suspended particulate matter (PM). The overall goals were to characterize the composition and identify the sources of particulate matter in Southeastern Texas, to develop and test new methods for characterizing fine particulate matter, and to collect data on the physical and chemical characterization of fine particulate matter that can be used to support exposure and health effects studies.
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: 2000-08-23Stop Date: 2000-09-18
Temporal Resolution: Variable
Data Set Progress
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
Role: TECHNICAL CONTACT
Email: aswexler at ucdavis.edu
Email: mvj at udel.edu
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.
2001. Size resolved ultrafine particle composition analysis
Part 2: Houston. J. Geophys. Res. In press.
Rhoads, K.P., D.J. Phares, A.S. Wexler, and M.V. Johnston.
2001. Size-resolved ultrafine particle composition analysis
Part1: Atlanta. J. Geophys. Res. In press.
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Creation and Review Dates
DIF Creation Date: 2004-01-15
Last DIF Revision Date: 2014-04-16