Archibald, AlexanderFreedman, ArnoldBejan, LustianBrown, StevenBrüggemann, MartinCarpenter, LucyCollins, JohnEvans, MathewFinlayson-Pitts, BarbaraGeorge, ChristianHastings, MeredithHeard, DwayneHewitt, ChristopherIsaacman-VanWertz, GabrielKalberer, MarkusKeutsch, FrankKiendler-Scharr, AstridKnopf, DanielLelieveld, JosMarais, EloisePetzold, AndreasRavishankara, A.Reid, JonathanRovelli, GraziaScott, CatherineSherwen, TomásShindell, DrewTinel, LiselotteUnger, NadineWallington, Timothy J.Wahner, AndreasWilliams, JonathanYoung, TimothyZelenyuk, AllaWallington, Timothy2019-08-292017Archibald, Alexander, Stephen Arnold, Lustinian Bejan, Steven Brown, Martin Brüggemann, Lucy J. Carpenter, William Collins, Mathew Evans, Barbara Finlayson-Pitts, Christian George, Meredith Hastings, Dwayne Heard, C. N. Hewitt, Gabriel Isaacman-VanWertz, Markus Kalberer, Frank Keutsch, Astrid Kiendler-Scharr, Daniel Knopf, Jos Lelieveld, Eloise Marais, Andreas Petzold, A. Ravishankara, Jonathan Reid, Grazia Rovelli, Catherine Scott, Tomás Sherwen, Drew Shindell, Liselotte Tinel, Nadine Unger, Andreas Wahner, Timothy J. Wallington, Jonathan Williams, Paul Young, and Alla Zelenyuk. 2017. Atmospheric Chemistry and the Biosphere: General Discussion. Faraday Discussions 200: 195-228.1359-66401364-5498http://nrs.harvard.edu/urn-3:HUL.InstRepos:41275751Lucy Carpenter opened discussion of the paper by Christian George: Your previous work has emphasised the abiotic production of VOCs from surface ocean processes, mainly from photosensitized chemistry of surfactants. Does this work indicate that decay of microbial cells is the really dominant source of these VOC-producing surfactants and photosensitizers, and if so - does this really mean this is an abiotic process? Christian George responded: As shown in our paper, VOC emissions increased drastically when the microbial cells were dying. Moreover, the highest VOC production was observed for the cellular fraction of the biofilms, i.e. intracellular material and cellular debris.en-USJournal Article2019-08-2910.1039/c7fd90038d