DOI: 10.1002/jgrd.50132
论文题名: Iodine chemistry in the eastern pacific marine boundary layer
作者: Martín J.C.G. ; Mahajan A.S. ; Hay T.D. ; Prados-Román C. ; Ordóñez C. ; Macdonald S.M. ; Plane J.M.C. ; Sorribas M. ; Gil M. ; Mora J.F.P. ; Reyes M.V.A. ; Oram D.E. ; Leedham E. ; Saiz-Lopez A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 2 起始页码: 887
结束页码: 904
语种: 英语
Scopus关键词: Absorption spectroscopy
; Boundary layers
; Iodine
; Molecules
; Nitrogen oxides
; Ozone layer
; Sun
; Differential optical absorption spectroscopy
; Marine boundary layers
; Meteorological variables
; Negative correlation
; Satellite observations
; Sea surface temperature (SST)
; Slant column densities
; Ultra-fine aerosols
; Loading
; aerosol
; atmospheric chemistry
; benthic boundary layer
; chlorophyll a
; concentration (composition)
; experimental study
; iodine
; marine atmosphere
; mixing ratio
; nucleation
; ozone depletion
; satellite imagery
; sea surface temperature
; trace gas
; Pacific Ocean
; Pacific Ocean (East)
英文摘要: Observations of gas-phase iodine species were made during a field campaign in the eastern Pacific marine boundary layer (MBL). The Climate and Halogen Reactivity Tropical Experiment (CHARLEX) in the Galápagos Islands, running from September 2010 to present, is the first long-term ground-based study of trace gases in this region. Observations of gas-phase iodine species were made using long-path differential optical absorption spectroscopy (LP-DOAS), multi-axis DOAS (MAX-DOAS), and resonance and off-resonance fluorescence by lamp excitation (ROFLEX). These measurements were supported by ancillary measurements of ozone, nitrogen oxides, and meteorological variables. Selective halocarbon and ultrafine aerosol concentration measurements were also made. MAX-DOAS observations of iodine monoxide (IO) display a weak seasonal variation. The maximum differential slant column density was 3.81013 molecule cm-2 (detection limit ∼7×1012 molecule cm-2). The seasonal variation of reactive iodine IOx (= I + IO) is stronger, peaking at 1.6 pptv during the warm season (February-April). This suggests a dependence of the iodine sources on the annual cycle in sea surface temperature, although perturbations by changes in ocean surface iodide concentration and solar radiation are also possible. An observed negative correlation of IOxwith chlorophyll-a indicates a predominance of abiotic sources. The low IO mixing ratios measured (below the LP-DOAS detection limit of 0.9 pptv) are not consistent with satellite observations if IO is confined to the MBL. The IOx loading is consistent with the observed absence of strong ozone depletion and nucleation events, indicating a small impact of iodine chemistry on these climatically relevant factors in the eastern Pacific MBL. © 2012. American Geophysical Union.
资助项目: SHIVA-226224-FP7-ENV-2008-1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64024
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: Laboratory for Atmospheric and Climate Science (CIAC), CSIC, Toledo, Castilla - La Mancha 45007, Spain; School of Chemistry, University of Leeds (UoL), Leeds, United Kingdom; Atmospheric Research and Instrumentation Branch, National Institute for Aerospace and Technology (INTA), Huelva, Spain; National Institute for Meteorology and Hydrology (INAMHI), Quito, Ecuador; National Centre for Atmospheric Science, University of East Anglia (UEA), Norwich, United Kingdom; Indian Institute of Tropical Meteorology (IITM), Pune, India; British Met Office, Exeter, United Kingdom; Andalusian Centre for Environmental Research (CEAMA), University of Granada, Granada, Spain
Recommended Citation:
Martín J.C.G.,Mahajan A.S.,Hay T.D.,et al. Iodine chemistry in the eastern pacific marine boundary layer[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(2)