globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025471
论文题名:
Ambient observations of hygroscopic growth factor and f(RH) below 1: Case studies from surface and airborne measurements
作者: Shingler T.; Sorooshian A.; Ortega A.; Crosbie E.; Wonaschütz A.; Perring A.E.; Beyersdorf A.; Ziemba L.; Jimenez J.L.; Campuzano-Jost P.; Mikoviny T.; Wisthaler A.; Russell L.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期:22
起始页码: 661
结束页码: 677
语种: 英语
英文关键词: aerosol ; biomass burning ; hygroscopicity ; refractive index ; SEAC4RS ; wildfire
Scopus关键词: aerosol ; airborne survey ; biomass burning ; growth rate ; hygroscopicity ; instrumentation ; NSCAT ; observational method ; particle size ; refractive index ; relative humidity ; volatilization ; water vapor ; wildfire ; Arizona ; Tucson ; United States
英文摘要: This 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 = Dp,wet/Dp,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. ©2016. American Geophysical Union. All Rights Reserved.
资助项目: NNX12AC03G ; NNX12AC10G ; NNX14AP75G ; NNX15AT96G
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62793
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ, United States; NASA Langley Research Center, Hampton, VA, United States; Universities Space Research Association, Columbia, MD, United States; Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, United States; Now at Air Pollution Control Division, Colorado Department of Public Health and Environment, Denver, CO, United States; Faculty of Physics, University of Vienna, Vienna, Austria; NOAA Earth System Research Laboratory, Boulder, CO, United States; Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Department of Chemistry and Biochemistry, University of Colorado Boulder, Boulder, CO, United States; Department of Chemistry, University of Oslo, Oslo, Norway; Institute for Ion Physics and Applied Physics, University of Innsbruck, Innsbruck, Austria; Scripps Institution of Oceanography, University of California, San Diego, CA, United States

Recommended Citation:
Shingler T.,Sorooshian A.,Ortega A.,et al. Ambient observations of hygroscopic growth factor and f(RH) below 1: Case studies from surface and airborne measurements[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(22)
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