Alkalinity of the Mediterranean Sea.

Schneider, Anke, Wallace, Douglas W.R. and Körtzinger, Arne (2007) Alkalinity of the Mediterranean Sea. Open Access Geophysical Research Letters, 34 (15). DOI 10.1029/2006GL028842.

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Total alkalinity (AT) was measured during the Meteor 51/2 cruise, crossing the Mediterranean Sea from west to east. AT concentrations were high (∼2600 μmol kg−1) and alkalinity-salinity-correlations had negative intercepts. These results are explained by evaporation coupled with high freshwater AT inputs into coastal areas. Salinity adjustment of AT revealed excess alkalinity throughout the water column compared to mid-basin surface waters. Since Mediterranean waters are supersaturated with respect to calcite and aragonite, the excess alkalinity likely reflects alkalinity inputs to coastal areas close to regions of deep and intermediate water formation. An alkalinity budget shows that main alkalinity inputs come from the Black Sea and from rivers, whereas the Strait of Gibraltar is a net sink. The major sink appears to be carbonate sedimentation. The basin-average net calcification rate and CaCO3 sedimentation was estimated to be 0.38 mol m−2 yr−1. The estimated residence time of AT is ∼160 yr.

Document Type: Article
Keywords: Alkalinity, Mediterranean Sea
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2006GL028842
ISSN: 0094-8276
Projects: Future Ocean
Date Deposited: 03 Dec 2008 16:51
Last Modified: 15 Feb 2018 09:54

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