DOI: 10.1007/s10533-015-0136-x
Scopus记录号: 2-s2.0-84948087818
论文题名: Global distribution and surface activity of macromolecules in offline simulations of marine organic chemistry
作者: Ogunro O.O. ; Burrows S.M. ; Elliott S. ; Frossard A.A. ; Hoffman F. ; Letscher R.T. ; Moore J.K. ; Russell L.M. ; Wang S. ; Wingenter O.W.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 126, 期: 2018-01-02 起始页码: 25
结束页码: 56
语种: 英语
英文关键词: Air–water interface
; Bubble films
; Fractional coverage
; Langmuir adsorption
; Mixed layer distributions
; Organic macromolecules
Scopus关键词: adsorption
; aerosol
; air-water interaction
; carbon
; isotherm
; marine environment
; mixed layer
; molecular analysis
; numerical model
; organic geochemistry
; sea surface
; simulation
; surfactant
英文摘要: Organic macromolecules constitute a high percentage of remote sea spray. They enter the atmosphere through adsorption onto bubbles followed by bursting at the ocean surface, and go on to influence the chemistry of the fine mode aerosol. We present a global estimate of mixed-layer macromolecular distributions, driven by offline marine systems model output. The approach permits estimation of oceanic concentrations and bubble film surface coverages for several classes of organic compound. Mixed layer levels are computed from the output of a global ocean ecodynamics model by relating the macromolecules to standard biogeochemical tracers. Steady state is assumed for labile forms, and for longer-lived components we rely on ratios to existing transported variables. Adsorption is then represented through conventional Langmuir isotherms, with equilibria deduced from laboratory analogs. Open water concentrations locally exceed one micromolar carbon for the total of proteins, polysaccharides and refractory heteropolycondensates. The shorter-lived lipids remain confined to regions of strong biological activity. Results are evaluated against available measurements for all compound types, and agreement is generally well within an order of magnitude. Global distributions are further estimated for both fractional coverage of bubble films at the air–water interface and the two-dimensional concentration excess. Overall, we show that macromolecular mapping provides a novel tool for the comprehension of oceanic surfactant patterns. These results may prove useful in planning field experiments and assessing the potential response of surface chemical behaviors to global change. © 2015, The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83454
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: New Mexico Institute of Mining and Technology, Socorro, NM, United States; Pacific Northwest National Laboratory, Richland, WA, United States; Los Alamos National Laboratory, Los Alamos, NM, United States; Scripps Institution of Oceanography, La Jolla, CA, United States; University of California, Berkeley, CA, United States; Oak Ridge National Laboratory, Oak Ridge, TN, United States; University of California, Irvine, CA, United States
Recommended Citation:
Ogunro O.O.,Burrows S.M.,Elliott S.,et al. Global distribution and surface activity of macromolecules in offline simulations of marine organic chemistry[J]. Biogeochemistry,2015-01-01,126(2018-01-02)