title: Effects of predicted climatic changes on distribution of organic contaminants in brackish water mesocosms.
abstract: Predicted consequences of future climate change in the northern Baltic Sea include increases in sea surface temperatures and terrestrial dissolved organic carbon (DOC) runoff. These changes are expected to alter environmental distribution of anthropogenic organic contaminants (OCs). To assess likely shifts in their distributions, outdoor mesocosms were employed to mimic pelagic ecosystems at two temperatures and two DOC concentrations, current: 15°C and 4 mg DOCL(-1) and, within ranges of predicted increases, 18°C and 6 mg DOCL(-1), respectively. Selected organic contaminants were added to the mesocosms to monitor changes in their distribution induced by the treatments. OC partitioning to particulate matter and sedimentation were enhanced at the higher DOC concentration, at both temperatures, while higher losses and lower partitioning of OCs to DOC were observed at the higher temperature. No combined effects of higher temperature and DOC on partitioning were observed, possibly because of the balancing nature of these processes. Therefore, changes in OCs' fates may largely depend on whether they are most sensitive to temperature or DOC concentration rises. Bromoanilines, phenanthrene, biphenyl and naphthalene were sensitive to the rise in DOC concentration, whereas organophosphates, chlorobenzenes (PCBz) and polychlorinated biphenyls (PCBs) were more sensitive to temperature. Mitotane and diflufenican were sensitive to both temperature and DOC concentration rises individually, but not in combination.
authors.affiliation: Department of Chemistry, Umea University, 901 87 Umeå, Sweden. Electronic address: matyas.ripszam@chem.umu.se.
authors.forename: M
authors.initials: M
authors.lastname: Ripszam
authors.affiliation: Department of Chemistry, Umea University, 901 87 Umeå, Sweden.
authors.forename: C M J
authors.initials: CM
authors.lastname: Gallampois
authors.affiliation: Department of Ecology and Environmental Sciences, Umeå University, 901 87 Umeå, Sweden.
authors.forename: Å
authors.initials: Å
authors.lastname: Berglund
authors.affiliation: Umeå Marine Sciences Centre, Umeå University, Norrbyn, 905 71 Hörnefors, Sweden.
authors.forename: H
authors.initials: H
authors.lastname: Larsson
authors.affiliation: Department of Ecology and Environmental Sciences, Umeå University, 901 87 Umeå, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Andersson
authors.affiliation: Department of Chemistry, Umea University, 901 87 Umeå, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Tysklind
authors.affiliation: Department of Chemistry, Umea University, 901 87 Umeå, Sweden.
authors.forename: P
authors.initials: P
authors.lastname: Haglund
mesh_terms: D057231:Climate Change; D017753:Ecosystem; D004784:Environmental Monitoring; D005618:Fresh Water / Q000737:chemistry; D009930:Organic Chemicals / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis; D012623:Seawater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls
keywords: Climate change; Dissolved organic carbon; Environmental distribution; Mesocosms; Organic contaminants; Temperature