DOI: 10.1016/j.atmosenv.2014.05.031
Scopus记录号: 2-s2.0-84901348114
论文题名: Variation in isotopologues of atmospheric nitric acid in passively collected samples along an air pollution gradient in southern California
作者: Bell M ; D ; , Sickman J ; O ; , Bytnerowicz A ; , Padgett P ; E ; , Allen E ; B
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 94 起始页码: 287
结束页码: 296
语种: 英语
英文关键词: Atmospheric deposition
; Lightning
; Nitric acid
; Nylasorb nylon filter
; Passive sampler
Scopus关键词: Air filters
; Isotopes
; Lightning
; Meteorological problems
; Mixing
; Nitric acid
; Passive filters
; Atmospheric depositions
; Continuous stirred tank reactor
; Independent sources
; Isotopic signatures
; Nylon filters
; Passive samplers
; Precipitation events
; Southern California
; Deposition
; nitric acid
; nitrogen 15
; nylon
; oxygen 18
; air sampling
; atmospheric chemistry
; atmospheric deposition
; atmospheric pollution
; concentration (composition)
; lightning
; nitric acid
; nitrogen isotope
; oxygen isotope
; sampler
; air pollution
; air sampling
; air temperature
; article
; chemical reaction
; continuous stirred tank reactor
; controlled study
; humidity
; lightning
; precipitation
; priority journal
; seasonal variation
; summer
; United States
; California
; Sonoran Desert
; United States
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: The sources and oxidation pathways of atmospheric nitric acid (HNO3) can be evaluated using the isotopic signatures of oxygen (O) and nitrogen (N). This study evaluated the ability of Nylasorb nylon filters to passively collect unbiased isotopologues of atmospheric HNO3 under controlled and field conditions. Filters contained in passive samplers were exposed in continuous stirred tank reactors (CSTRs) at high (16μg/m3) and moderate (8μg/m3) HNO3 concentrations during 1-4 week deployment times. Filters were concurrently exposed at high and low N deposition sites along a gradient in the Sonoran Desert. Filters deployed in CSTRs at moderate HNO3 concentrations for 1-2 weeks had greater variation of δ18O relative to the 3-4 week deployments, while high concentration samples were consistent across weeks. All deployment means were within 2‰ of the source solution. The δ15N of all weekly samples were within 0.5‰ of the source solution. Thus, when deployed for longer than 3 weeks, Nylasorb filters collected an isotopically unbiased sample of atmospheric HNO3. The initial HNO3 samples at the high deposition field sites had higher δ15N and δ18O values than the low deposition sites, suggesting either two independent sources of HNO3 were mixing or that heavier isotopologues of HNO3 were preferentially lost from the gas phase through physical deposition or equilibrium chemical reactions. Subsequent HNO3 samples were subject to summer monsoon conditions leading to variation of isotopic signatures of N and O following 2-source mixing dynamics. Both sites mixed with a source that dominated during the two discrete precipitation events. The high number of lightning strikes near the samplers during the monsoon events suggested that lightning-created HNO3 was one of the dominant mixing sources with an approximate isotopic signature of 21.6‰ and -0.6‰ for δ18O and δ15N respectively. Two-source mixing models suggest that lightning-created HNO3 made up between 40 and 42% of atmospheric HNO3 at the high deposition sites and 59-63% at the low deposition during the 4 week exposure. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/81091
Appears in Collections: 气候变化事实与影响
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作者单位: University of California, Riverside, Department of Botany and Plant Sciences, 900 University Avenue, Riverside, CA 92521, United States; University of California, Riverside, Department of Environmental Science, 900 University Avenue, Riverside, CA 92521, United States; USDA Forest Service, Pacific Southwest Research Station, 4955 Canyon Crest Drive, Riverside, CA 92507, United States
Recommended Citation:
Bell M,D,, Sickman J,et al. Variation in isotopologues of atmospheric nitric acid in passively collected samples along an air pollution gradient in southern California[J]. Atmospheric Environment,2014-01-01,94