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13 pages, 8 figuresTo understand dissolved organic carbon (DOC) seasonal dynamics in a coastal oligotrophic site in the north-western Mediterranean Sea, we monitored DOC concentrations monthly over 3 yr, together with the meteorological data and the food-web-related biological processes involved in DOC dynamics. Additional DOC samples were taken in several inshore-offshore transects along the Catalan coast. We found DOC concentrations of ~60 pmol C l-1 in winter, with increasing values through the summer and autumn and reaching 100 to 120 pmol C l-1 in November. There was high inter-annual variability in this summer DOC accumulation, with values of 36, 69 and 13 pmol C l-1 for 2006, 2007 and 2008, respectively. The analysis of the microbial food-web processes involved in the DOC balance did not reveal the causes of this accumulation, since the only occasion on which we observed net DOC production (0.3 ± 1 pmol C l-1 d-1 on average) was in 2007, and the negative DOC balance of 2006 and 2008 did not prevent DOC accumulating. The DOC accumulation episodes coincided with low rates of water renewal (average 0.037 ± 0.021 d-1 from May to October) compared with those of winter to early spring (average 0.11 ± 0.048 d-1 from November to April). Indeed, the amount of DOC accumulated each year was inversely correlated with the average summer rainfall. We hypothesize that decreased DOC turn-over due to photochemical or biological processes-Mostly active during the summer-And low water renewal rate combine to determine seasonal DOC accumulation and influence its inter-annual variability. © Inter-Research 2012This work was supported by the Spanish project FLUBIOLIT (CTM 2004-04404-C02-02/MAR). The work of G.V.R. and M.V. was supported by the project FAMOSO (CTM2008-06261-C03-01). The work of C.C. and J.M.G. was supported by the projects MODIVUS (CTM2005-04795/MAR) and STORM (CTM2009-09352/MAR), and sampling was also contributed by the projects PROBA (2007AR0018, CSIC) and GEMMA (CTM2007-63753-C02-01/MAR, MEC) to R. Massana and C. Pedrós-Alió. Financial support was provided by a PhD fellowship from the Spanish government to G.V.R.Peer Reviewe

Seasonal dynamics and net production of dissolved organic carbon in an oligotrophic coastal environment