Proposed aircraft schedule:
Five week deployment in Asia from late March to the end of April 2001.

Contact person:
John Seinfeld, California Institute of Technology
Phone: 626-395-4100
Fax: 626-585-1729
E-mail: seinfeld@cco.caltech.edu

Description of platform objectives:

A major goal of the ACE-Asia intensive experiment is to survey the air leaving Eastern Asia to characterize aerosol physical, chemical, and optical properties and their variation with time and space, emphasizing variations with altitude and distance from the continent. We are proposing to carry out a suite of airborne measurements aboard the CIRPAS Twin Otter aircraft. Aerosol size distributions will be measured on the Twin Otter with an array of four instrµments, spanning the diameter range of 30 nm to 30 µm, consisting of three optical particle counters (PCASP, FSSP, CAPS) and one differential mobility analyzer (DMA). Aerosol chemical composition will be measured with 5-stage MOUDI cascade impactors and an aerosol mass spectrometer. Aerosol optical properties will be obtained by four nephelometers and a Particle Soot Absorption Photometer. This combination of instrµments will yield light scattering, absorption, 180° backscatter, extinction, and lidar ratio, single scatter albedo, and Angstrom exponent. Hygroscopic properties will be available from the low and high RH nephelometers and a tandem differential mobility analyzer (TDMA). The 14-wavelength NASA Ames airborne tracking sunphotometer will continuously measure the optical depth of the column of air between the aircraft and the top of the atmosphere, providing the essential data to evaluate the extent of column radiative closure achievable.
 

The following PIs have been funded to participate:
 

Organizations Participating	PI
California Institute of Technology	John Seinfeld, Rick Flagan, Jian Wang, Jose Jimenix, Roya Bahreini, Brian Mader
Naval Post Graduate School	Haf Jonsson
Texas A&M University	Don Collins
Nasa Ames	Phil Russell, Maura Rabbette
University of Washington	Dean Hegg

Measurement	Instrument	PI	Others
Aerosol size distribution 10 nm-1µm	DMA System (cabin)	Seinfeld/Flagan	Jian Wang
Aerosol hygroscopic properties	TDMA System (cabin)	Don Collins
Aerosol composition 40 nm-3 µm volatile components	Aerosol Mass Spectrometer (cabin)	Seinfeld/Flagan	Jose Jimenez Roya Bahreini
Aerosol optical depth 14 channels	NASA Sunphotometer (cabin)	P. Russell	NASA team
EC/OC/Organic speciation	Denuder/Filter Samplers (cabin)	Seinfeld/Flagan	Brian Mader (CIT)
EC/OC/Organic speciation/Inorganic ions	MSP MOUDI Impactor/Filter Sampler (wing)	D. Hegg/H. Jonsson Seinfeld/Flagan
Aerosol optical properties	TSI Nephelometer Soot Photometer (cabin)	H. Jonsson (NPS) Seinfeld/Flagan
Aerosol hygroscopic properties	Humidigraph (3 RR Nephelometers) (cabin)	D. Hegg (UW)
Aerosol size distribution >0.3 µm (CAPS) 0.1-2.5 µm (PCASP) >0.5 µm (FSSP)	CAPS Probe PCASP FSSP (wing)	H. Jonsson (NPS) Seinfeld/Flagan
Aerosol size distribution >0.5 µm	TSI Aerodynamic Particle Sizer (cabin)	H. Jonsson (NPS) Seinfeld/Flagan
Total aerosol number concentration	Condensation Nucleus Counters (CNCs)	H. Jonsson (NPS) Seinfeld/Flagan
Downwelling and            Upwelling  Solar            Spectral Irradiance,            1320 channels	NASA Ames Solar Spectral Flux Radiometer (cabin)	Maura Rabbette	NASA Ames team