DOI: 10.1002/jgrd.50522
论文题名: Gas/particle partitioning of total alkyl nitrates observed with TD-LIF in Bakersfield
作者: Rollins A.W. ; Pusede S. ; Wooldridge P. ; Min K.-E. ; Gentner D.R. ; Goldstein A.H. ; Liu S. ; Day D.A. ; Russell L.M. ; Rubitschun C.L. ; Surratt J.D. ; Cohen R.C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 6651
结束页码: 6662
语种: 英语
英文关键词: aerosols and particles
; instruments and techniques
; pollution: urban and regional
; troposphere: composition and chemistry
Scopus关键词: Aerosols
; Atmospheric chemistry
; Dissociation
; Electrospray ionization
; Functional groups
; Liquid chromatography
; Troposphere
; Aerosols and particles
; Biogenic hydrocarbons
; Chemical characterization
; Fourier transform infra reds
; Gas/particle partitioning
; Instruments and techniques
; Quadrupole-time of flights
; Ultra performance liquid chromatography
; Nitrates
; aerosol
; alkane
; fluorescence
; Fourier transform
; gas phase reaction
; instrumentation
; ionization
; isoprene
; liquid chromatography
; mass spectrometry
; monoterpene
; nitrate
; oxidation
; particle size
; troposphere
; urban pollution
; Bakersfield
; California
; United States
英文摘要: Limitations in the chemical characterization of tropospheric organic aerosol (OA) continue to impede attempts to fully understand its chemical sources and sinks. To assess the role of organic nitrates in OA, we used a new thermal dissociation-laser induced fluorescence-based (TD-LIF) technique to obtain a high-time-resolution record of total aerosol organic nitrates (hereafter ΣANsaer ) at the Bakersfield, CA supersite during the 2010 CalNex campaign. The TD-LIF measurements compare well with Fourier transform infrared measurements from collocated filter samples. These measurements show that ΣANs are a ubiquitous component of the OA with the -ONO2 subunit comprising on average 4.8% of the OA mass. Scaling this fraction by an estimate of the organic backbone mass yields an estimate that 17-23% of OA molecules contain nitrate functional groups. Measurements of both total ΣAN (gas + aerosol) and ΣANaer show that on average 21% of ΣANs are in the condensed phase, suggesting atmospheric organic nitrates have similar volatilities to analogous non-nitrate oxidized organic compounds. The fraction of ΣAN that is in the condensed phase increases with total OA concentration, providing direct evidence from the atmosphere that absorptive partitioning into OA has some control over the ΣAN phase partitioning. The specific molecular identity of the ΣAN is incompletely understood. Both biogenic hydrocarbons and long chain alkanes are calculated to be significant sources of low volatility nitrates in Bakersfield, and ultra performance liquid chromatography coupled to an electrospray ionization high-resolution quadrupole time-of-flight mass spectrometer measurements confirm the existence of particulate nitrooxy organosulfates derived from gas-phase oxidation of both isoprene and monoterpenes. Key Points 21% of alkyl and multifunctional organic nitrates are in the condensed phase. Absorptive partitioning impacts gas/particle partitioning. © 2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63603
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 Chemistry, University of California, Berkeley, CA 94720, United States; NOAA Earth System Research Laboratory, Chemical Sciences Division and CIRES, Boulder, CO, United States; Department of Earth and Planetary Sciences, University of California, Berkeley, CA, United States; Department of Civil and Environmental Engineering, University of California, Berkeley, CA, United States; Department of Environmental Science Policy and Management, University of California, Berkeley, CA, United States; Scripps Institution of Oceanography, University of California, San Diego, San Diego, CA, United States; CIRES, University of Colorado Boulder, Boulder, CO, United States; Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
Recommended Citation:
Rollins A.W.,Pusede S.,Wooldridge P.,et al. Gas/particle partitioning of total alkyl nitrates observed with TD-LIF in Bakersfield[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)