ATOFMSAerosol Time of Flight Mass Spectrometry
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The aircraft collected aerosol size distributions, cloud condensation nuclei (CCN), ice nuclei [Colorado State University's continuous flow diffusion chamber (CSU CFDC)], aerosol and cloud residual particle chemistry (ATOFMS), and cloud microphysical data over a region extending from just off the Pacific coast to the Nevada border, and along the Central Valley.
The first was submitted in 2012 to DOE for use of its G-l aircraft and AMF2, as well as the UCSD SIO's ATOFMS, the CSU CFDC ice nucleation instrument, and other sensors, to pursue CalWater objectives.
The same aerosol suite (aerosol size distribution, aerosol mass, aerosol composition, CCN) and precipitation sampling systems used in previous CalWater 1 efforts were used in the early start campaign Additionally, aerosol filter collections were made for biological and ice nucleating particle analyses extending across the entire mixed-phase cloud temperature regime, and the first field linkage of the CFDC with an ATOFMS to measure the compositions of aerodynamically separated ice crystals [activated ice nucleus (IN)] from the CFDC [using a pumped counterflow virtual impactor (PCVI)].
The DOE G-1 came as part of ACAPEX, along with ice nucleating particle measurements online by CFDC and offline using filter collections, ATOFMS, and a major suite of cloud microphysics sensors.