Abstract


DISTRIBUTION OF DISSOLVED ORGANIC CARBON DEFICITS IN THE BLACK SEA

The deep Black Sea is characterized as having dissolved organic carbon (DOC) concentrations ~2.5 times higher than the deep ocean. The two major DOC sources to the Black Sea are rivers and the Sea of Marmara, while expansive phytoplankton blooms also contribute autochthonous carbon to the Black Sea’s ~800 TgC DOC reservoir. Here, a basin-wide zonal section of DOC will be presented using data from the Dutch GEOTRACES MedBlack 2013 cruise. DOC distributions are interpreted with respect to well-described layers of the Black Sea, in conjunction with other hydrographic and biogeochemical parameters. Surface DOC concentrations reach a maximum of 205 µmol/kg, which decreases with depth, reaching a mid-depth minimum of 113 µmol/kg in the upper Anoxic Layer. Concentrations then increase with depth, reaching a deep maximum of ~122 µmol/kg near the upper boundary of the Benthic Bottom Layer (~1750 m). Despite these high DOC concentrations at great depth, a deficit in DOC has been identified at the depth of the DOC minimum; abiotic mechanisms of removal such as co-precipitation and particle scavenging will be considered.

http://www.rsmas.miami.edu/groups/biogeochem/

Authors

Margolin, A. R., University of Miami - Rosenstiel School of Marine and Atmospheric Science, USA, amargolin@rsmas.miami.edu

Hansell, D. A., University of Miami - Rosenstiel School of Marine and Atmospheric Science, USA, dhansell@rsmas.miami.edu

Rijkenberg, M., Royal Netherlands Institute for Sea Research, Netherlands, micha.rijkenberg@nioz.nl

Gerringa, L. J., Royal Netherlands Institute for Sea Research, Netherlands, loes.gerringa@nioz.nl

Details

Oral presentation

Session #:035
Date: 2/25/2015
Time: 11:00
Location: Picasso (Floor -2)

Presentation is given by student: Yes