Ambient observations of hygroscopic growth factor and f (RH) below 1: Case studies from surface and airborne measurements
Perring, Anne E.
Jimenez, Jose L.
Russell, Lynn M.
AffiliationUniv Arizona, Dept Chem & Environm Engn
Univ Arizona, Dept Hydrol & Atmospher Sci
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationAmbient observations of hygroscopic growth factor and f(RH) below 1: Case studies from surface and airborne measurements 2016, 121 (22):13,661 Journal of Geophysical Research: Atmospheres
Rights©2016. American Geophysical Union. All Rights Reserved.
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AbstractThis study reports a detailed set of ambient observations of optical/physical shrinking of particles from exposure to water vapor with consistency across different instruments and regions. Data have been utilized from (i) a shipboard humidified tandem differential mobility analyzer during the Eastern Pacific Emitted Aerosol Cloud Experiment in 2011, (ii) multiple instruments on the NASA DC-8 research aircraft during the Studies of Emissions, Atmospheric Composition, Clouds and Climate Coupling by Regional Surveys in 2013, and (iii) the Differential Aerosol Sizing and Hygroscopicity Spectrometer Probe during ambient measurements in Tucson, Arizona, during summer 2014 and winter 2015. Hygroscopic growth factor (ratio of humidified-to-dry diameter, GF = D-p,D-wet/D-p,D-dry) and f(RH) (ratio of humidified-to-dry scattering coefficients) values below 1 were observed across the range of relative humidity (RH) investigated (75-95%). A commonality of observations of GF and f(RH) below 1 in these experiments was the presence of particles enriched with carbonaceous matter, especially from biomass burning. Evidence of externally mixed aerosol, and thus multiple GFs with at least one GF < 1, was observed concurrently with f(RH) < 1 during smoke periods. Possible mechanisms responsible for observed shrinkage are discussed and include particle restructuring, volatilization effects, and refractive index modifications due to aqueous processing resulting in optical size modification. To further investigate ambient observations of GFs and f(RH) values less than 1, it is recommended to add an optional prehumidification bypass module to hygroscopicity instruments, to preemptively collapse particles prior to controlled RH measurements.
Note6 month embargo; Published Online: 23 November 2016
VersionFinal published version
SponsorsNASA [NNX12AC10G, NNX14AP75G, NNX12AC03G, NNX15AT96G]; ONR [N00014-16-1-2567, N00014-10-1-0811]; NSF [AGS-1008848, AGS-1048995]; NASA Earth and Space Science Fellowship [NNX14AK79H]; Austrian Federal Ministry for Transport, Innovation and Technology (bmvit) through the Austrian Space Applications Programme (ASAP) of the Austrian Research Promotion Agency (FFG); Visiting Scientist Program at the National Institute of Aerospace (NIA)