Whole season net community production in the Weddell Sea

• Published in: Polar Biology
• Main Authors: Hoppema, Mario, Middag, Rob, de Baar, Hein J. W., Fahrbach, Eberhard, van Weerlee, Evaline M., Thomas, Helmuth, Weerle, E.M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2007
• Subjects: MARGINAL ICE-ZONE; SOUTHERN-OCEAN; ROSS SEA; ANTARCTIC OCEAN; INORGANIC CARBON; ATLANTIC SECTOR; IRON LIMITATION; PARTICLE-FLUX; SILICA CYCLE; SCOTIA SEA; Antarctic; Antarctic Ocean; Ross Sea; Scotia Sea; Southern Ocean; Weddell; Weddell Sea; Antarc*; Polar Biology
• Online Access: https://hdl.handle.net/11370/3c906e78-7110-4ddb-ab89-c93ec9b0e8f9; https://research.rug.nl/en/publications/3c906e78-7110-4ddb-ab89-c93ec9b0e8f9; https://doi.org/10.1007/s00300-007-0336-5

Depletions of total CO2, nitrate, phosphate and silicate in the surface layer were calculated for cruise ANT XXII/3 with FS Polarstern in March 2005 for estimating the annual net community production. East-west across the Weddell Sea the variation of all depletions is similar, but this holds to a lesser extent for silicate. Depletions in March 2005 are 2-3 times larger than those in January 1993 for the same transect. Very low N:P and C:P depletion ratios seem to point to dominance of diatoms, in the central Weddell Sea more than in the margin. Estimates of annual net community productions are about 1.8 and 3.5 mol C m(-2) year(-1) for the interior Weddell Sea and a near-margin region, respectively. The region does not comply with the classical view of a marginal ice zone with high productivity. Net community production is similar to annual export production, implying that remineralization in the ensuing winter be minor.