@article{fdi:010081597,
  title = {{D}istributions of low molecular weight dicarboxylic acids, ketoacids and alpha-dicarbonyls in the marine aerosols collected over the {A}rctic {O}cean during late summer},
  author = {{K}awamura, {K}. and {O}no, {K}. and {T}achibana, {E}. and {C}harriere, {B}. and {S}emp{\'e}r{\'e}, {R}ichard},
  editor = {},
  language = {{ENG}},
  abstract = {{O}xalic and other small dicarboxylic acids have been reported as important water-soluble organic constituents of atmospheric aerosols from different environments. {T}heir molecular distributions are generally characterized by the predominance of oxalic acid ({C}-2) followed by malonic ({C}-3) and/or succinic ({C}-4) acids. {I}n this study, we collected marine aerosols from the {A}rctic {O}cean during late summer in 2009 when sea ice was retreating. {T}he marine aerosols were analyzed for the molecular distributions of dicarboxylic acids as well as ketocarboxylic acids and alpha-dicarbonyls to better understand the source of water-soluble organics and their photochemical processes in the high {A}rctic marine atmosphere. {W}e found that diacids are more abundant than ketoacids and alpha-dicarbonyls, but their concentrations are generally low (< 30 ng m(-3)), except for one sample (up to 70 ng m(-3)) that was collected near the mouth of {M}ackenzie {R}iver during clear sky condition. {A}lthough the molecular compositions of diacids are in general characterized by the predominance of oxalic acid, a depletion of {C}-2 was found in two samples in which {C}-4 became the most abundant. {S}imilar depletion of oxalic acid has previously been reported in the {A}rctic aerosols collected at {A}lert after polar sunrise and in the summer aerosols from the coast of {A}ntarctica. {B}ecause the marine aerosols that showed a depletion of {C}-2 were collected under the overcast and/or foggy conditions, we suggest that a photochemical decomposition of oxalic acid may have occurred in aqueous phase of aerosols over the {A}rctic {O}cean via the photo dissociation of oxalate-{F}e ({III}) complex. {W}e also determined stable carbon isotopic compositions (delta {C}-13) of bulk aerosol carbon and individual diacids. {T}he delta {C}-13 of bulk aerosols showed -26.5 parts per thousand (range: -29.7 to -24.7 parts per thousand), suggesting that marine aerosol carbon is derived from both terrestrial and marine organic materials. {I}n contrast, oxalic acid showed much larger delta {C}-13 values (average: -20.9 parts per thousand, range: -24.7 parts per thousand to -17.0 parts per thousand) than those of bulk aerosol carbon. {I}nterestingly, delta {C}-13 values of oxalic acid were higher than {C}-3 (av. -26.6 parts per thousand) and {C}-4 (-25.8 parts per thousand) diacids, suggesting that oxalic acid is enriched with {C}-13 due to its photochemical processing (aging) in the marine atmosphere.},
  keywords = {{ARCTIQUE}},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {9},
  numero = {11},
  pages = {4725--4737},
  ISSN = {1726-4170},
  year = {2012},
  DOI = {10.5194/bg-9-4725-2012},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081597},
}