Nitrous Oxide (N2O) production in axenic Chlorella vulgaris microalgae cultures: evidence, putative pathways, and potential environmental impacts Biogeosciences DOI 10.5194/bg-10-6737-2013 25 October 2013 Using antibiotic assays and genomic analysis, this study demonstrates nitrous oxide (N2O) is generated from axenic Chlorella vulgaris cultures. In batch assays, this production is magnified under conditions favouring intracellular nitrite accumulation, but repressed when nitrate reductase (NR) activity is inhibited. Read more
Carbonate mineral saturation states in the East China Sea: present conditions and future scenarios Biogeosciences DOI 10.5194/bg-10-6453-2013 11 October 2013 To assess the impact of rising atmospheric CO2 and eutrophication on the carbonate chemistry of the East China Sea shelf waters, saturation states (Ω) for two important biologically relevant carbonate minerals were calculated throughout the water column. Read more
A novel salinity proxy based on Na incorporation into foraminiferal calcite Biogeosciences DOI 10.5194/bg-10-6375-2013 9 October 2013 This study investigates the impact of salinity on foraminiferal Na/Ca values by laser ablation ICP-MS analyses of specimens of the benthic foraminifer Ammonia tepida cultured at a range of salinities (30.0–38.6). Read more
Remote sensing of LAI, chlorophyll and leaf nitrogen pools of crop- and grasslands in five European landscapes Biogeosciences DOI 10.5194/bg-10-6279-2013 7 October 2013 The purpose of this study is to use field-based and satellite remote-sensing-based methods to assess leaf nitrogen pools in five diverse European agricultural landscapes located in Denmark, Scotland (United Kingdom), Poland, the Netherlands and Italy. LAI, chlorophyll and leaf nitrogen pools of crop- and grasslands in five European landscapes">Read more
Multiple stressors of ocean ecosystems in the 21st century: projections with CMIP5 models Biogeosciences DOI 10.5194/bg-10-6225-2013 2 October 2013 Ocean ecosystems are increasingly stressed by human-induced changes of their physical, chemical and biological environment. Here, we use the most recent simulations performed in the framework of the Coupled Model Intercomparison Project 5 to assess how stressors such as warming, acidification deoxygenation and changes in primary productivity by marine phytoplankton, may evolve over the course of the 21st century. Read more
Increased soil temperature and atmospheric N deposition have no effect on the N status and growth of a mature balsam fir forest Biogeosciences DOI 10.5194/bg-10-4627-2013 11 July 2013 Nitrogen (N) is a major growth-limiting factor in boreal forest ecosystems. Increases of temperature and atmospheric N deposition are expected to affect forest growth directly and indirectly by increasing N availability due to higher rates of N mineralization. We conducted experiments on a mature balsam fir stand in Canada to understand the potential impacts of these changes. Read more
Impact of change in climate and policy from 1988 to 2007 on environmental and microbial variables at the time series station Boknis Eck, Baltic Sea Biogeosciences DOI 10.5194/bg-10-4529-2013 4 July 2013 The temporal development of phytoplankton was monitored from 1988 to the end of 2007 at the time series station Boknis Eck in the western Baltic Sea. Read more
Seasonal measurements of total OH reactivity emission rates from Norway spruce in 2011 Biogeosciences DOI 10.5194/bg-10-4241-2013 26 June 2013 One way to investigate the chemical interplay between biosphere and atmosphere is through the measurement of total OH reactivity, the total loss rate of OH radicals. This study presents the first determination of total OH reactivity emission rates based on a branch cuvette enclosure system mounted on a Norway spruce throughout spring, summer and autumn 2011. Read more
Iodine-129 concentration in seawater near Fukushima before and after the accident at the Fukushima Daiichi Nuclear Power Plant Biogeosciences DOI 10.5194/bg-10-3839-2013 14 June 2013 Anthropogenic radionuclides were released into the environment in large quantities by the Fukushima Daiichi Nuclear Power Plant (1FNPP) accident. To evaluate accident-derived 129I, the 129I concentrations in seawater before and after the accident were compared. Read more
Surface pathway of radioactive plume of TEPCO Fukushima NPP1 released 134Cs and 137Cs Biogeosciences DOI 10.5194/bg-10-3067-2013 7 May 2013 134Cs and 137Cs were released to the North Pacific Ocean by two major likely pathways, direct discharge from the Fukushima NPP1 accident site and atmospheric deposition off Honshu Islands of Japan, east and northeast of the site. High density observations of 134Cs and 137Cs in the surface water were carried out by 17 cruises of cargo ships and several research vessel cruises from March 2011 till March 2012. TEPCO Fukushima NPP1 released 134Cs and 137Cs">Read more
