Aerosol Optical Property Measurements for ARM: the New 3-laser Photoacoustic Instrument for the ISDAC and SGP
| Manvendra Dubey | Los Alamos National Laboratory |
| Claudio Mazzoleni | Los Alamos National Laboratory |
Category: Instruments
There is concern that the workhorse filter based particle/soot absorption photometer (PSAP) measurements of aerosol absorption may suffer from interferences under certain conditions. We will review these issues using recent field and laboratory studies and develop a path forward to resolve this problem. We will describe a new 3-laser photoacoustic instrument, which measures aerosol absorption, scattering and single scatter albedo in situ at 405, 532, and 780 nm and does not suffer from matrix artifacts. The instrument is being deployed for the Amospheric Radiation Measurement (ARM)Program/Atmospheric Science Program (ASP) Indirect and Semi-direct Aerosol Campaign (ISDAC) campaign in March, and another one is being ordered for the ARM Climate Research Facility (ACRF) Southern Great Plains (SGP) site. We will report laboratory studies of black carbon, smoke, clays, serpentine, alumina, silicon nitride, and hematite to illustrate the instrument capabilities. We will also describe current gaps that need to be filled such as optical property measurements as a function of relative humidity and absorption in the ultraviolet region and how our 3-laser photoacoustic can help fill these. Our goal is to work closely with the ARM user community to improve the quality and reliability of aerosol optical measurements.
This poster will be displayed at ARM Science Team Meeting.
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