Fast Measurements of Aerosol Size Distribution, Hygroscopicity, and Volatility for Aircraft Deployme

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Fast Measurements of Aerosol Size Distribution,
Hygroscopicity, and Volatility for Aircraft
Deployment

• Jian Wang
• Brookhaven National Laboratory
• ASP Science Team Meeting
• January 26, 2005
• Charleston, South Carolina

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Fast Aerosol Size Distribution Measurements
Springston et al.

• Need for high time resolution measurements of
  aerosol size distributions
• Measurements onboard research aircrafts
• Systems involving rapid aerosol dynamics

Latitude
Longitude

• Conventional Instruments
• Scanning Mobility Particle Sizer (SMPS)
• Optical Particle Counters (OPC)

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Aerosol Mobility Size Spectrometer
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Experimental Setup for Preliminary Tests
CPC
Neutralizer
AMSS
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Picture of Grown Particles
Experiments with PSL particles
Images of grown particles
E
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Sizing Accuracy of AMSS
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Particle Conc. Measured by AMSS and CPC
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Resolution of AMSS (Preliminary Results)
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Hygroscopicity and Volatility Measurements

• Aerosol hygroscopicity and volatility are
  currently measured using Tandem Differential
  Mobility Analyzers (TDMA).
• TDMA measurements also provide information on
• Size resolved mixing state of aerosol.
• Size resolved chemical composition.

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Hygroscopicity and Volatility Measurements
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Products and Needs

• Products
• Aerosol size distribution (every 1 sec.)
• Aerosol hygroscopicity and volatility (every 2
  minutes)
• Need from others
• Size resolved chemical compositions. (To study
  evolutions of aerosol size, hygroscopicity, and
  CCN concentration.)
• Trace gas measurements.

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Acknowledgement

• Pramod Kulkarni
• Peter Takacs
• Peter Daum
• Steven Springston
• Funding
• Atmospheric Science Program, DOE
• Goldhaber Fellowship, BNL
• LDRD, BNL