Zark, Maren; Dittmar, Thorsten; Riebesell, Ulf (2015): Dissolved organic matter molecular composition and concentrations from a large scale mesocosm study KOSMOS 2013 Kristineberg) on ocean acidification. doi:10.1594/PANGAEA.846137, Supplement to:Zark, Maren; Riebesell, Ulf; Dittmar, Thorsten (2015): Effects of ocean acidification on marine dissolved organic matter are not detectable over the succession of phytoplankton blooms. Science Advances, 1(9), e1500531-e1500531, doi:10.1126/sciadv.1500531
Marine dissolved organic matter (DOM) represents one of the largest active carbon reservoirs on Earth. Changes in pool size or composition could have major impacts on the global carbon cycle. Ocean acidification is a potential driver for these changes because it influences marine primary production and heterotrophic respiration. Here we show that ocean acidification as expected for a 'business-as-usual' emission scenario in the year 2100 (900 µatm) does not affect the DOM pool with respect to its size and molecular composition. We applied ultrahigh-resolution mass spectrometry to monitor the production and turnover of 7,360 distinct molecular DOM features in an unprecedented long-term mesocosm study in a Swedish Fjord, covering a full cycle of marine production. DOM concentration and molecular composition did not differ significantly between present-day and year 2100 CO2 levels. Our findings are likely applicable to other coastal and productive marine ecosystems in general.
Data are protected on request of the authors for a moratorium period of 2 years, beginning with the publication of the paper (2015-10-02). To receive a copy of the data, please contact the principal investigator as given in the description of the datasets.