Research‎ > ‎Field Studies‎ > ‎CalWater 2011‎ > ‎



Aircraft (DOE/PNNL G-1)

Measurements made onboard the DOE/PNNL G-1 will involve sampling through a counterflow virtual impactor (CVI) which will selectively sample cloud droplets and ice crystals which will be dried and sent directly to the ATOFMS for size-resolved chemical analysis.  Similar measurements for the impacts of aerosols on cloud microphysics were performed onboard the NCAR C-130 during the ICE-L campaign in 2007.


Principal InvestigatorsDr. Kimberly Prather [UCSD/SIO], Dr. Daniel Rosenfeld [Hebrew Univ. Jerusalem]
Single Particle ChemistryAircraft Aerosol Time of Flight Mass Spectrometer (A-ATOFMS): Shirley (SLY)
Ice Nuclei (IN)Continuous Flow Diffusion Chamber (CFDC) [Dr. Paul DeMott and co-workers, Colorado State Univ]
Cloud Condensation Nuclei (CCN)Fast CCN Counter [Dr. Athanasios Nenes and co-workers, Georgia Tech.]
Cloud and Aerosol SizingSuite of instruments for cloud and aerosol sizing 55 nm-50,000 µm
Aerosol Optical PropertiesNephelometer, Particulate Soot Absorption Photometer
Sample Collection/Inlets2.5 µm size cut isokinetic inlet, counter-flow virtual impactor (CVI), cloud water collector
GasesCO, Ozone
Total Water ContentGerber PVM-100, CAPS-hotwire, DMT Cloud Spectrometer and Impactor (CSI), SEA total water WCM-2000
Atmospheric Statetemperature, static pressure, differential pressure, dew-point temperature, wind/turbulence

Aircraft mission operations will be supported by GOES-11 satellite imagery of cloud cover provided by the NASA Langley Cloud and Radiation Group, led by Dr. Patrick Minnis.



Principal stationary aerosol and precipitation sampling will be performed at Sugar Pine Dam outside Foresthill, CA within the Tahoe National Forest.  This will be the third consecutive year of sampling at this site during the same time of year using the Prather Research Group's Portable Aerosol Observatory.

A small-scale setup for measuring aerosol size distributions and cloud condensation nuclei will be stationed along with a major NOAA radar station at Lincoln, CA, to gain a better understanding of the spatial distribution of aerosol characteristics in a ground based transect of the central Sierra Nevada.

A network of automated precipitation samplers (Dr. Tyler Coplen, US Geological Survey) will be positioned at four sites in California: Cazadero, Lincoln, Sugar Pine Dam, and Shasta Dam.  Each of these sites coincides with a deployment of NOAA meteorological and radar instrumentation.


Sugar Pine Dam Stationary Sampling Site during CalWater 2010


Prather Group Portable Aerosol Observatory
Size Resolved Aerosol Chemistry (0.2-3 microns)Aerosol Time of Flight Mass Spectrometry (ATOFMS): Laverne (LVN)
Size Resolved Aerosol Chemistry (0.08-1 micron)Aerosol Time of Flight Mass Spectrometry (ATOFMS): Jake (JKE)
Aerosol Size Distributions

Aerodynamic Particle Sizer (APS, 0.5-20 um), Scanning Mobility Particle Sizer (SMPS, 11-600 nm), nano-Scanning Mobility Particle Sizer (nano-SMPS, 3-100 nm)

Aerosol Optical Properties7-Wavelength Aethalometer, Integrating Nephelometer
Particulate Mass (PM2.5)Beta Attenuation Monitor (BAM) with 2.5 micron size cut
Gas PhaseSO2, CO, NOx, O3
PrecipitationHigh-volume precipitation collection for offline analysis


Collaborative Measurements

Cloud Condensation Nuclei (CCN)

Mini-CCN counter [Dr. Greg Roberts and Dr. Craig Corrigan, SIO]

CCN Chemistry

Micro-Capillary Electrophoresis CCN (CCN-MCE) and bulk aerosol Micro-Capillary Electrophoresis (WCPC-MCE) [Dr. Greg Roberts and Dr. Scott Noblitt, SIO]

Continuous Impactor8-DRUM Aerosol Sampler [Dr. Steve Cliff, UC Davis]
Precipitation CollectionAutomated Carousel Precipitation Collector for offline isotope analysis [Dr. Tyler Coplen, US Geological Survey]


The National Oceanic and Atmospheric Administration (NOAA) will station a vertically-pointing S-Band Profiling Radar, tipping bucket rain gauge, and surface meteorology sensors at this stationary ground site.