AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
Abstract View
Deployment of a PM2.5-capable Aerosol Chemical Speciation Monitor in Nanjing, China
Yunjiang Zhang, Lili Tang, PHILIP CROTEAU, Hongliang Zhang, Ping Chen, Wen Xu, Leah Williams, Manjula Canagaratna, John Jayne, Douglas Worsnop, NUIST / JSEM, China
Abstract Number: 383 Working Group: Instrumentation and Methods
Abstract Aerosol Mass Spectrometers (AMS) and Aerosol Chemical Speciation Monitors (ACSM) measure the chemical composition of non-refractory PM1. However, in locations where there are a significant number of particles with diameters between 1 and 2.5 microns, AMS and ACSM systems measure lower mass concentrations than PM2.5 monitoring instruments and are unable to provide information about the chemical composition of these particles. In order to address this issue, modifications have been made to the sampling inlet, aerodynamic focusing lens, and particle vaporizer used in both AMS and ACSM systems to allow them to quantitatively measure non-refractory PM2.5. In order to test these modifications with ambient aerosol we deployed a PM2.5-capable ACSM at the Jiangsu Environmental Monitoring Center in Nanjing, China during October and November, 2015 along with a PM1 ACSM and other PM2.5 monitoring instruments including a Monitor for AeRosols and Gases in Ambient air (MARGA), 7-Wavelength Aethalometer, semi-continuous OC-EC, Tapered Element Oscillating Microbalance (TEOM), and PM1 and PM2.5 Beta Attenuation Monitors (BAM). During the deployment, the PM2.5 mass ranged from 6 to 250 micro-g/m3 and the average PM1 to PM2.5 ratio was about 0.5. Here we present an overview of the PM2.5 system for ACSM and AMS and the results of this intercomparison which demonstrate good agreement between the PM2.5 ACSM and the other PM2.5 monitoring instruments for both mass and chemical composition.