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Particle Analysis By Laser Mass Spectrometry (PALMS)


Operated By: 
PALMS instrument in lab

PALMS instrument in lab

The NOAA PALMS instrument measures single-particle aerosol composition using UV laser ablation to generate ions that are analyzed with a time-of-flight mass spectrometer.  The PALMS size range is approximately 150 to >3000 nm and encompasses most of the accumulation and coarse mode aerosol volume. Individual aerosol particles are classified into compositional classes.  The size-dependent composition data is combined with aerosol counting instruments from Aerosol Microphysical Properties (AMP), the Langley Aerosol Research Group Experiment (LARGE), and other groups to generate quantitative, composition-resolved aerosol concentrations.  Background tropospheric concentrations of climate-relevant aerosol including mineral dust, sea salt, and biomass burning particles are the primary foci for the ATom campaigns.  PALMS also provides a variety of compositional tracers to identify aerosol sources, probe mixing state, track particle aging, and investigate convective transport and cloud processing.

*_Standard data products_**: *

Particle type number fractions: sulfate/organic/nitrate mixtures, biomass burning, EC, sea salt, mineral dust, meteoric, alkali salts, heavy fuel combustion, and other. Sampling times range from 1-5 mins.

*_Advanced data products_**:*

Number, surface area, volume, and mass concentrations of the above particle types. Total sulfate and organic mass concentrations. Relative and absolute abundance of various chemical markers and aerosol sub-components: methanesulfonic acid, sulfate acidity, organic oxidation level, iodine, bromine, organosulfates, pyridine, and other species.

Instrument Type: 
Recent Missions: 
ACCLIP (WB-57 - JSC); ATom (DC-8 - AFRC); SEAC4RS (DC-8 - AFRC); MACPEX (WB-57 - JSC); TC4 (DC-8 - AFRC); CR-AVE (WB-57 - JSC)
Complete mission list:
Point(s) of Contact: 
Daniel Murphy (Prev PI), Gregory Schill (POC; PI), Michael Lawler (Co-I)