4.3 Article

Could submarine groundwater discharge be a significant carbon source to the southern Baltic Sea?

Journal

OCEANOLOGIA
Volume 56, Issue 2, Pages 327-347

Publisher

POLISH ACAD SCIENCES INST OCEANOLOGY
DOI: 10.5697/oc.56-2.327

Keywords

Bay of Puck; Seepage water; Dissolved organic carbon; Dissolved inorganic carbon; Carbon loads; Carbon budget; Baltic Sea; World Ocean

Categories

Funding

  1. National Science Centre [2012/05/N/ST10/02761]
  2. AMBER
  3. BONUS+ EU FP6 Project

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Submarine Groundwater Discharge (SGD) is an important yet poorly recognised pathway of material transport to the marine environment. This work reports on the results of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) concentrations and loads in the groundwater seeping into the southern Baltic Sea. Most of the research was carried out in the Bay of Puck (2009-2010), while in 2013 the study was extended to include several other groundwater seepage impacted areas situated along the Polish coastline. The annual average concentrations of DIG and DOG in the groundwater were equal to 64.5 +/- 10.0 mg C L-1 and 5.8 +/- 0.9 mg C L-1 respectively. The carbon specific flux into the Bay of Puck was estimated at 850 mg m(-2) yr(-1). The loads of carbon via SGD were scaled up for the Baltic Sea sub-basins and the entire Baltic Sea, The DIG and DOG fluxes via SGD to the Baltic Sea were estimated at 283.6 +/- 66.7 kt yr(-1) and 25.5 +/- 4.2 kt yr(-1). The SGD derived carbon load to the Baltic Sea is an important component of the carbon budget, which gives the sea a firmly heterotrophic status.

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