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@ARTICLE{Franco:894240,
      author       = {Franco, B. and Blumenstock, T. and Cho, C. and Clarisse, L.
                      and Clerbaux, C. and Coheur, P.-F. and De Mazière, M. and
                      De Smedt, I. and Dorn, H.-P. and Emmerichs, T. and Fuchs, H.
                      and Gkatzelis, Georgios and Griffith, D. W. T. and Gromov,
                      S. and Hannigan, J. W. and Hase, F. and Hohaus, T. and
                      Jones, N. and Kerkweg, A. and Kiendler-Scharr, A. and
                      Lutsch, E. and Mahieu, E. and Novelli, A. and Ortega, I. and
                      Paton-Walsh, C. and Pommier, M. and Pozzer, A. and Reimer,
                      D. and Rosanka, S. and Sander, R. and Schneider, M. and
                      Strong, K. and Tillmann, R. and Van Roozendael, M. and
                      Vereecken, L. and Vigouroux, C. and Wahner, A. and
                      Taraborrelli, D.},
      title        = {{U}biquitous atmospheric production of organic acids
                      mediated by cloud droplets},
      journal      = {Nature},
      volume       = {593},
      number       = {7858},
      issn         = {1476-4687},
      address      = {London [u.a.]},
      publisher    = {Nature Publ. Group},
      reportid     = {FZJ-2021-03120},
      pages        = {233 - 237},
      year         = {2021},
      abstract     = {Atmospheric acidity is increasingly determined by carbon
                      dioxide and organic acids1,2,3. Among the latter, formic
                      acid facilitates the nucleation of cloud droplets4 and
                      contributes to the acidity of clouds and rainwater1,5. At
                      present, chemistry–climate models greatly underestimate
                      the atmospheric burden of formic acid, because key processes
                      related to its sources and sinks remain poorly
                      understood2,6,7,8,9. Here we present atmospheric chamber
                      experiments that show that formaldehyde is efficiently
                      converted to gaseous formic acid via a multiphase pathway
                      that involves its hydrated form, methanediol. In warm cloud
                      droplets, methanediol undergoes fast outgassing but slow
                      dehydration. Using a chemistry–climate model, we estimate
                      that the gas-phase oxidation of methanediol produces up to
                      four times more formic acid than all other known chemical
                      sources combined. Our findings reconcile model predictions
                      and measurements of formic acid abundance. The additional
                      formic acid burden increases atmospheric acidity by reducing
                      the pH of clouds and rainwater by up to 0.3. The diol
                      mechanism presented here probably applies to other aldehydes
                      and may help to explain the high atmospheric levels of other
                      organic acids that affect aerosol growth and cloud
                      evolution.},
      cin          = {IEK-8},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {2111 - Air Quality (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2111},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {33981052},
      UT           = {WOS:000649848600015},
      doi          = {10.1038/s41586-021-03462-x},
      url          = {https://juser.fz-juelich.de/record/894240},
}