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Rapid, Size-Resolved Aerosol Hygroscopic Growth Measurements: Differential Aerosol Sizing and Hygroscopicity Spectrometer Probe (DASH-SP)

Sorooshian, Armin and Hersey, Scott and Brechtel, Fred J. and Corless, Andrew and Flagan, Richard C. and Seinfeld, John H. (2008) Rapid, Size-Resolved Aerosol Hygroscopic Growth Measurements: Differential Aerosol Sizing and Hygroscopicity Spectrometer Probe (DASH-SP). Aerosol Science and Technology, 42 (6). pp. 445-464. ISSN 0278-6826. https://resolver.caltech.edu/CaltechAUTHORS:20150818-111625670

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Abstract

We report on a new instrument developed to perform rapid, size-resolved aerosol hygroscopicity measurements. The differential aerosol sizing and hygroscopicity spectrometer probe (DASH-SP) employs differential mobility analysis in-concert with multiple humidification and optical sizing steps to determine dry optical size and hygroscopic growth factors for size-selected aerosols simultaneously at three elevated relative humidities. The DASH-SP has been designed especially for aircraft-based measurements, with time resolution as short as a few seconds. The minimum particle diameter detected with 50% efficiency in the optical particle counters (OPCs) is 135 ± 8 nm, while the maximum detectable particle diameter is in excess of 1 μm. An iterative data processing algorithm quantifies growth factors and “effective” refractive indices for humidified particles using an empirically derived three-dimensional surface (OPC pulse height–refractive index–particle size), based on a calculated value of the “effective” dry particle refractive index. Excellent agreement is obtained between DASH-SP laboratory data and thermodynamic model predictions for growth factor dependence on relative humidity for various inorganic salts. Growth factor data are also presented for several organic acids. Oxalic, malonic, glutaric, and glyoxylic acids grow gradually with increasing relative humidity up to 94%, while succinic and adipic acids show no growth. Airborne measurements of hygroscopic growth factors of ship exhaust aerosol during the 2007 Marine Stratus/Stratocumulus Experiment (MASE II) field campaign off the central coast of California are presented as the first report of the aircraft integration of the DASH-SP.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1080/02786820802178506DOIArticle
http://www.tandfonline.com/doi/abs/10.1080/02786820802178506PublisherArticle
ORCID:
AuthorORCID
Sorooshian, Armin0000-0002-2243-2264
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Additional Information:© 2008 American Association for Aerosol Research. Received 3 December 2007; accepted 3 May 2008. Brechtel Mfg. Inc. acknowledges the support of Dr. Ronald Ferek and the ONR SBIR Program under grant N00014-05-C-0016. This work was also supported by the Office of Naval Research grant N00014-04-1-0118. We appreciate valuable comments and suggestions by Jeff Snider.
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-05-C-0016
Office of Naval Research (ONR)N00014-04-1-0118
Issue or Number:6
Record Number:CaltechAUTHORS:20150818-111625670
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150818-111625670
Official Citation:Armin Sorooshian, Scott Hersey, Fred J. Brechtel, Andrew Corless, Richard C. Flagan & John H. Seinfeld (2008): Rapid, Size-Resolved Aerosol Hygroscopic Growth Measurements: Differential Aerosol Sizing and Hygroscopicity Spectrometer Probe (DASH-SP), Aerosol Science and Technology, 42:6, 445-464 http://dx.doi.org/10.1080/02786820802178506
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59734
Collection:CaltechAUTHORS
Deposited By: Irina Meininger
Deposited On:19 Aug 2015 19:37
Last Modified:03 Oct 2019 08:49

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