Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-16501-2008 http://www.atmos-chem-phys-discuss.net/8/16501/2008/ http://www.atmos-chem-phys-discuss.net/8/16501/2008/acpd-8-16501-2008.html http://www.atmos-chem-phys-discuss.net/8/16501/2008/acpd-8-16501-2008.pdf 16501 16516 2008-08-28 The time dependence of molecular iodine emission from <i>Laminaria digitata</i> S. Dixneuf A. A. Ruth a.ruth@ucc.ie S. Vaughan R. M. Varma J. Orphal Department of Physics, University College Cork, Cork, Ireland Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université de Paris-Est, Créteil, France We present the first in situ detection of molecular iodine emitted from the brown macroalga <i>Laminaria digitata</i> under natural stress conditions. We show that the release of I₂ occurs in short, strong bursts with a complex time signature. 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